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Module 1, , 1., , By increasing the temperature the resistance of a metallic conductor …., [a] Increases, [b] decreases, [c] remains constant, [d] first increases then decreases, , 2., , A conductor carries a current of 50 mA if the area of cross section of the conductor is 50 mm2 then, value of the current density in Ampere/ square meter is, [a] 0.5, [b] 1, [c] 0.1, [d) 3/10, , 3., , Conductance is reciprocal of, [a] resistance, [b] inductance, [c] Reluctance, [d] capacitance, , 4., , Which of the following material has nearly zero temperature co-efficient of, resistance?, [a] Manganin, [b] Porcelain, [c] Carbon, d] Copper, , 5., , According to Kirchhoff first law current at a Junction is, [a] sum of incoming current, [c] sum of outgoing current, , [b] sum of voltages, [d] 0, , 6., , The suppression capacitor used in starter along with a fluorescent lamp is to, [a] improve power factor, [b] reduce flickering, [c] Reduce radio interference [d] increase lumen output, , 7., , Three 6 ohm resistances are in the form of a triangle. The effective resistance between two corners, of a triangle is, [a] 3 ohm, [b] 4 ohm, [c] 6 ohm, [d] 12 ohm, , 8., , If a 220 volt heater is used on 110 volt supply heat produced by it would be, [a] twice, [c] one fourth, [b] four times, [d] one half, , 9., , When a voltage source is connected to a load its terminal voltage falls due to, [a] high source impedance, [b] high load resistance, [c] low source impedance, [d] low source voltage, , 10. The resistance of human body is about, [a] 200 ohm, [b] 20ohm, [c]1000 ohm, [d] 25 ohm, 11. Four identical resistors are first connected in parallel and then in, Series. The resultant resistance of the first combination to the, Second will be, A. 1 / 16 times, B. 1 / 4 times, C. 4 times, D. 16 times., 12. The unit of electrical conductivity is, A. mho / metre, B. mho / sq. m, C. ohm /metre, D. ohm / sq. m., , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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13. Which of the following bulbs will have the least resistance?, A. 220V, 60 W, B.220 V, 100 W, C. 115 V, 60 W, D.115V, 100 W., 14. The ratio of the resistance of a 100 W, 220 V lamp to that of a 100, W, 110 V lamp will be nearly, A. 4, B. 2, C. 1/ 2, D. 1/ 4, 15. A wire of 0.14 mm diameter and specific resistance 9.6 micro ohmcm is 440 cm long. The resistance of the wire will be, A. 9.6 ohm, B. 11.3 ohm, C. 13.7 ohm ., D. 27.4 ohm., 16. Ohm’s law is not applicable to, A. DC circuits, B. high currents, C. small resistors, D. semi-conductors., 17. A metal resistor has resistance of 10 ohm at 0°C and 11 ohms at, 160°C, the temperature coefficient is, A. 0.00625 / °C, B. 0.0625 PC, C. 0.000625 /°C, (D) 0.625 /°C., 18. A resistance of 5 ohms is further drawn so that its length becomes, Double. Its resistance will now be, A. 5 ohms, B. 7.5 ohms, C. 10 ohms, D. 20 ohms., 19. A wire of resistance R has it length and cross-section both doubled., Its resistance will become, A. 4 R, B. 2 R, C. R D. R/4., 20. Low resistance can be accurately measured by, A. Kelvin bridge, B. Wheat stone bridge, C. Wein's bridge, D. None of the above, , 21. Resistance of the earth should be, [a] high, [c] Infinite, , [b] low, [d] the minimum possible, , 22.Between 1 milli ampere to 20 Milli ampere , electric shock will be, [a] Just bearable ·, [c] Stop breathing, , [b] Painful, [d] fibrillation of heart, , 23. In a Delta network each element has a value of 3ohm, the value of each element in equivalent, Star network will be, [a] 6 ohm, [b] 9 ohm, [c] 1.5 ohm, [d] 1 ohm, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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24. The RMS value of sinusoidal voltage wave V= 200 sin wt:, [a] 100/2 volt, [c] 100 volt, , [b] 200 volt, [d] 200/\/2 volt, , 25. The colour bands of fixed carbon resistor, [a] 22ohm, [b] 2.2 ohm, [c] 0.22 ohm, [d] 225 ohm, , are red ,red, gold, it's value is, , 26. Drift velocity of electron is, A. less than speed of light, B. greater than speed of light, C. almost equal to speed of light, D. very small in comparison to speed of light, 27. The electrical conductivity of metals is typically of the order of (in, Ohm-1 m-1), A. 105, B. 10-6, C.10-4, D. 103, 28. The colour bands on a fixed carbon resistor are red, red, gold, Its value is:, A. 22Ω, B. 2.2 Ω, C. 0.22 Ω, D. 225 Ω, 29. Which of the following current is considered dangerous for the human body?, A. 0.5 mA, B. 50mA C. 1 mA, D. 25mA, 30. If the two bulbs in a house, one glows brighter than the other., Which of the two has higher resistance?, A. the bright bulb, B. the dim bulb, C. both have same resistance, D. brightness does not depend upon the resistance., 31. in an ordinary heater if the length of the coil is halved, then a give, Quantity of water will boil in……..,., A. more time, B. less time, C. same time, D. none of these, 32. Electric current is a:, A. scalar quantity, C. both (a) and (b), , B. vector quantity, D. none of these, , 33. Two bulbs 100W, 250V and 200W, 250V are connected in series, Across a 500V line, then, a. Both bulbs will be fused, B. 200W bulb will be fused, c. 100W bulb will be fused, D. No bulb will be fused, , 34. Comparing No.10 and No.14 bare copper wires of equal length, the, No.14 wire will have greater, A. weight, B. strength, C. resistance, D. cost, 35. EMF in a circuit………., A. causes current to flow, B. maintains potential difference, C. increases the circuit resistance., D. none of these, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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36. Which of the following materials has a negative temperature co-efficient of resistance?, [a] Copper, [b] Aluminium, [c] Carbon, [d] Brass, 37. Ohm's law is not applicable to, [a] vacuum tubes, [b] carbon resistors, [c] high voltage circuits, [d] circuits with low current densities, 38. Which is the best conductor of electricity?, [a] Iron, [b] Silver, [c] Copper, [d] Carbon, 39. For which of the following 'ampere second' be the unit?, [a] Reluctance, [b] Charge, [c] Power, [d] Energy, 40. Which of the following statement is true?, [a] A galvanometer with low resistance in parallel is a voltmeter, [b] A galvanomneter with high resistance in parallel is a voltmeter, [c] A galvanometer with low resistance in parallel is an ammeter, [d] A galvanometer with high resistance in series is an ammeter, 41. The ratio of the resistance of a 200W, 230V lamp to that of a 100W,, 115V lamp will be, A. 0.5, b.2, C. 4 D. 0.25, 42. 5 X 1016 electrons pass across the section of a conductor in 1, Minutes and 20 seconds. The current flowing is, A. 0.1 mA. B. 1 mA, C. 10mA, D. 100 mA, 43. Three element having conductance G1, G2 and G3 are connected in, Parallel. Their combined conductance will be, A.(G1 + G2 + G3)., B. G1 + G2 + G3, C. I/G1 + 1/G2+ 1/G.,, D. (1/G1+ 1/G2+ 1/G3)-1, 44.A 60 W bulb in series with a room heater is connected across the, Mains. If the 60 W bulb is replaced by 100 W bulb, A. the heater output will increase, B. the heater output will decrease, C. the heater output will be same, D. the heater output will slightly decrease., 45. The RMS value of sinusoidal voltage wave v = 100sinwt, is, A. 100/√2 V, B.200 V, C.100 V D. 200 √2 V, 46. All of the following have negative temperature coefficient EXCEPT, A. paper, B. tungsten, C. germanium, D. rubber, 47. The hot resistance of a tungsten lamp is about 10 times the cold, Resistance. Accordingly, cold resistance of a 100W, 200V lamp will be, A. 400 Ω, B. 40 Ω, C. 4 Ω, D. 800 Ω, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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48. Which of the following material is not used as fuse element?, A. Silver, B. Copper, C. Aluminium, D. Carbon, 49.Four resistance RI, R2, R3, & R4, are connected in series across., A 220V supply. The resistances are such that, R1 > R2 > R3 > R4, The least power consumption will be in, A. R2, B. R4, C. R1, D. R3, 50. Which of the following is not the same as watt?, A. joules/sec, B. amperes/volt, C. amperes x volts, D. (ampere)2x ohm, 51. Three 60 W bulbs are in parallel across the 60 V power line .If one bulb burns open, [a] there will be heavy current in the main line, [b] rest of the two bulbs will not light, [c] all three bulbs will light, [d] the other two bulbs will light, 52. A closed switch has a resistance of, [a] zero, [b] about 50 ohms, [c] about 500 ohms, [d] infinity, 53. The thickness of insulation provided on the conductor depends on, [a]the magnitude of voltage on the conductor, [b]the magnitude of current flowing through, [c] both a and b, [d] none of the above, 54. A glass rod when rubbed with silk cloth is charged because, [a] it takes in proton, [b] its atoms, [c] it gives away electrons, [d] it gives away positive charge, 55. Two lamps 100 W and 40 W are connected in series across 230 V (alternating) . Which of, the following statement is correct?, [a] 100 W lamp will glow brighter, [b] 40 w lamp will glow brighter, [c] Both glow equally bright, [d] 40 w lamp will fuse, 56. Resistance: of carbon filament lamp as the applied voltage increases:, [a] increases, [b] decreases, [c] remains same, [d] none of the above, 57. For testing appliances, the wattage of test lamp should be, [a] very low, [b]·low, [c] high, [d] any value, , 58. Internationally ohm is defined in terms of the resistance of, [a) a column of mercury, [b] a cube of carbon, [c] a cube of copper, [d] the unit length of wire, 59. which method can be used for absolute measurement of resistances?, [a] Lorentz method, [b] Releigh method, [c] Ohm's law method, [d] wheatstone bridge method, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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60. Two copper conductors have equal length. The cross sectional area of one conductor is four, times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40, ohms the resistance of other conductor will be, [a] 160 ohms, [b] 80 ohms, [c] 20 ohms, [d] 10 ohms, 61. A circuit contains two unequal resistor in parallel, A. voltage drops across both are same, B. currents in both are same, C. heat losses in both are same, D. voltage drops are according to their resistive value, 62. Two resistances R1 and R2 give combined resistances 4.5 ohm, And 1 ohm when they are connected in series and parallel respectively., What would be the values of these resistances?, A. 3Ω and 6 Ω, B. 1.5 Ω and 3 Ω, C. 3 Ω and 9 Ω, D. 6 Ω and 9 Ω, 63. Mass of a proton is how many times greater than mass of an electron, A. 184000, B.18400, C.1840, D.184, 64. A wire of resistance R is doubled by stretching half of the stretched, Wire will have resistance, A. 2R, B.4 R, C. R D. R/4, 65. The heating element of an electric heater should be made with, Material which should have:, A. high specific resistance and high melting point, B. high specific resistance and low melting point, C. low specific resistance and low melting point, D. low specific resistance and high melting point, 66. Two 100W, 200V lamps are connected in series across a 200 V supply, The total power consumed by each lamp will be………..watts, A.25, b.50, c.100, D.200, , 67. The material used for fuse must have:, A. low melting point and high specific resistance, B. low melting point and low specific resistance, C; high melting-point and high specific resistance, D. high melting point and low specific resistance, 68. How many different combinations may be obtained with three, Resistors, each having resistance R?, A. 3, B. 4, C. 5 D.6, 69. Two equal resistors R connected in series across a voltage source, V dissipate power P. What would be the power dissipated in the, Same resistors when they are connected in parallel across the same, Voltage source?, A. 4P, B. P, C. 2P, D.16P, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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70. Two identical resistors are first connected in parallel then in, Series. The ratio of resultant resistance of the first combination to, The second will be, A. 4, B. 0.25, C.2 D. 0.5, 71. The condition for the validity under Ohm's law is that, [a] resistance must be linear, ,, [b] current should be proportional to the size of the resistance, [c] resistance must be wire wound type, [d] temperature at positive end should be more than the, temperature at negative end, 72. An open resistor, when checked with an ohm-meter reads, [a] zero, [b] infinite, [c] high but within tolerance, [d] low but not zero, 73. Which of the following can have negative temperature coefficient?, [a] Compounds of silver, [b] Liquid metals, [c] Metallic alloys, [d] Electrolytes, 74. One newton meter is same as, , 75., , [a] one watt, , [b] onejoule, , [c] five joule s, , [d]onejoul esecond, , The speed with ·which the effect of EMF is experienced at, all parts of a conductor resulting the flow of current is, [a] velocityof charge, [b] velocity of propagati on of electric field, [c] speed of response, , [d] none of the above, , 76. in an electric circuit electrons flow from a point of, A. lower potential to higher potential, B. higher potential to lower potential, C. high altitude to low altitude, D. none of these, 77. What is the difference between an atom and an ion?, A. Ions have always larger mass than the atoms of the same element, B. Ions are neutral particles while atoms always carry a positive charge, C. Ions are always charged particles while the atoms are neutral as a whole, D. Ions can only exist in liquid solutions, 78. Resistivity of a wire depends on, A. material, B. length, C. cross section are., D. all of above, 79. When n numbers resistances of each value r are connected in, Parallel, then the resultant resistance is x. When these n resistances, Are connected in series, total resistance is, A, nx, B. (n^2)x., C. x/n., D. rnx., 80. Resistance of a wire is r ohms. The wire is stretched to double its, Length, then its resistance will be, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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A. r/2, , B.4r, , C. 2r, , D. r/4, , 81. Kirchhoff's second law is based on law of conservation of, A. charge, B. energy, C. momentum, D. mass, 82. One coulomb of electrical charge is contributed by how many electrons?, A. 0.625 X 1019,, B.1.6 X1019., 19, C. 6.25 X 10 ., D. 1.6 X 1012, 83. Two bulbs marked 200 watts - 250 V, and 100 watts - 250 V are joined, In series to 250 V supply. The power consumed by the circuit is, A. 33 watt B. 200 watt C. 300 watt D. 67 watt., 84. A wire of resistance 10 ohm is bent to form a circle. Effective resistance, Between two points on any diameter of the circle is, A. 10Ω, B. 5Ω, C. 15Ω, D. 2.5Ω, 85. Three resistances 1 ohm each are connected to form a triangle., The resistance between any two corners will be:, A.3 Ω, B.3/2 Ω, C.2/3 Ω, D.1/3 Ω, , 86. Drift velocity of electrons is, [a] larger than speed of light, [b] almost equal to speed of light, [c] less than speed of light, [d] very small in comparison to speed of light, 87. For a fixed supply voltage the current flowing through a conductor will, increase when its:, [a] area of cross section is reduced, [b]Length is reduced, [cl Length is increased, [d] All of these, 88. Pure metals generally have, [a] high conductivity and low temperature coefficient, [b] high conductivity and large temperature coefficient, [c] low conductivity and zero temperature coefficient, [d] low conductivity and high temperature coefficient, 89. The value of temperature coefficient of resistance of a given conductor are, [a] the same at different temperature, [b] higher at higher temperature, [c] different at different temperatures, [d] none of the above, 90. Two resistors R1 and R2 give combined resistance of 6 ohm when in series and 0.83 ohm when in parallel, the resistances are:, [a] 3ohm and 3 ohm, [b] 4 ohm and 2 ohm, [c] 5 ohm and I ohm, [d] 4.5 ohm and 1.5 ohm, 91. One horse power is:, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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(A) 735.5 Nm/ s, , (B) 756 watts, , (C) I 000Wh, , (D) 746 Ws, , 92. Three capacitors of value 1 micro Farad, 4 micro Farad and 8 micro, Farad are connected in parallel across 230 V supply. The maximum, Current will pass through:, (A) The same current will flow each capacitance, (B) 1 micro farad capacitor, (C) 4 micro farad capacitor, (D) 8 micro farad capacitor, 93. The resistance of a parallel circuit consisting of two resistors is 4.8, Ohms. One of the resistance wire breaks and the effective resistance, Becomes 12 ohm. The resistance of broken wire is:, (A) 36 ohm, (B) 24 ohm (C) 18 ohm, (D) 8 ohm, 94. The "Superposition theorem" is essentially based on the concept of, (A) Duality., (B) Linearity, (C) Reciprocity., (D) non-linearity., 95. The combined resistance of two equal resistors connected in, Parallel is equal to, (A) One half the resistance of one resistor, (B) Twice the resistance of one resistor., (C) Four times the resistance of one resistor., (D) One fourth the resistance of one resistor, 96. The unit of inductance is:, (A) Webber (B) Farad (C) Semens, , [d]Henry, , 97. An electric lamp of 40 watt will consume one unit of energy in, Hours., (A) 2.5 (B) 4, (C) 25 (D) 40, 98. Solder is an alloy of:, (A) Lead-Tin, (B) Copper-Tin, (C) Tin-Silver, (D) Tin- Silver-Lead, 99. Unit of electric charge is, (A) Farad, (B) ampere, (C) Joule, [d] coulomb, 100. What do you understand by electromotive force '?, A. The torque produced by a motor, B. The force experienced by an electromagnet, C. The force with which the current carrying conductors attract or, Repel each other, D. The voltage produced in a voltage source, 101. When an electric current flows through a conductor its temperature rises due to:, [a] mutual collision between metal atoms, [b] mutual collisions between conducting electrons, [c] collisions between conduction electrons and atoms, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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[d] release of conduction electrons from parent atoms, 102. 1kilowatt hour is equal to, [a] 860 kcal, [b] 36 x 10^5 joules, [c] both [a] and [b] [d] none of the above, 103. An ideal voltage source should have:, [a] zero source resistance, [b] Infinite source resistance, [c] terminal voltage in proportion to current ·, [d] terminal voltage in proportion to load, 104. Electrical conductivity is measured in:, [a]mho/m, [b]mho m, [c] mho/m^3, [d]mho/m^2, 105., , An active element is, [a] resistor, [b] inductor, [c] current source, [d] all of these, 106. If three, 30µf capacitances are connected in series., Find the effective value, (A) 30µF, (B) 60µF, (C) 90 µF, (D) 10µF, 107. The resistance of a heating coil required in a 2500 watts heater, Used on 200 V main will be:, (A) 10.25 ohms, (B) 16 ohms, (C) 25 ohms, (D) 12.5 ohms, 108. Four resistances of values 400, 300, 200 and 100 ohms are, Connected in parallel, the equivalent Resistance will be:, (A) More than 1000 ohms (B) 500 ohms, (C) 1000 ohms, (D) less than 100 ohms, 109. In a carbon resistor the tolerance band is not marked, then its, Tolerance will be:, (A) 0% (B)10%, (C) 20%, (D) 5%, 110. 1 M ohm, 1 W resistance is likely to be a :, (A) Wire wound resistor (B) carbon resistor, (C) rheostat, (D) none of the above, 111. A thermister has:, (A) High temperature co-efficient, (B) Variable temperature co-efficient, (C) Positive temperature co -efficient, (D)Negative temperature co –efficient, 112. The resistance of 100 meter length of copper wire of 14 SWG is 'x', Ohms. The resistance of 100 meter of copper wire of 8 SWG will be, (A) More than 'x' ohms (B) equal to x' ohms, (C) less than 'x' ohms, (D) equal to `2x' ohms, 113. In a delta network each element has a value of 3 ohm. The value of, Each element in equivalent star network will be:, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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(A) 1 ohm, , (B) 6 ohm (C) 1.5 ohm (D) 9 ohm, , 114. A circuit has resistors, capacitors and semi-conductor diodes., The circuit will be known as:, (A) Linear circuit, (B) bilateral circuit, (C) Non-linear circuit (D) none of the above, 115. The power factor of a purely resistive circuit is, (A) Zero., (B) Unity (C) lagging. (D) Leading., , 116. Kirchhoff law is applicable to:, [a] AC circuits only, [b] passive networks only, [c] AC as well as DC circuits [d] DC circuits only, 117. Closed path made of several branches of the network is known as:, [a) loop, [b] branch, [c] terminal [d] junction, 118. A bilateral element is/are:, [a] resistor, [b] inductor, [c] capacitor, [d) all of these, , 119. A terminal where more than two branches meet is known as:, [a] node, [b] terminal, [c] anode [d] none of these, 120. Kirchhoff laws are valid for:, [a] linear circuits only, [b] passive time invariant circuit, [c] nonlinear circuits only, [d] both linear and nonlinear circuits, 121. Which device stores electrical energy?, (A) diode, (B) Capacitor, (C) Thermistor, (D) Resistor, 122. What is the unit of conductance?, (A) Ohm, (B) Mho, (C) Henry, (D) Watt, 123. Heat developed in a conductor is proportional to the square of the:, (A) Current (B) voltage (C) power (D) time, 124. Electrical energy is measured in, (A) Volt-ampere, (B) kW, (C) KVA, (D) KWH, 125. Two 230 V bulbs, L1 is 60 W and L2 is 100 W, are connected in series across a 240 V line., How will the bulbs glow?, (A) Both L1 and L2 will glow with equal brightness, (B) Both L2 will glow brighter than L2, (C) Both L1 will glow brighter than L2, (D) Both bulbs will not glow, 126. The colour code for 100 ohm resistor is, (A) Black, Red, Orange, (B) Red, Black, Red, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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(C) Brown, Black, Brown, , (D) Black, Black, Red, , 127. One micro volt is written as:, (A)lx 103 V, (B) 1 x 106 V, -6, (C) I x 10 V, (D)Ix10-3V, 128. If three, 30 ohm resistances are connected in parallel., Find the effective resistance:, (A) 10Ω, (B) 90Ω, (C) 30 Ω, (D) 270Ω, 129. From the following materials, which one has higher resistivity at 20°C :, (A) Copper, (B) German silver, (C) Mercury, (D) Nichrome, 130. The sequence of colour band on a 47 K ohm with ± 5% tolerance resistor will be:, (A) Yellow, violet, yellow and gold, (B) yellow, violet, orange and gold, (C) Yellow, violet, orange and silver, (D) Yellow, violet, brown and silver, 131. 100 watt bulb is connected in series with the room, heater if now 100watt bulb is replaced by u 40watt bulb the heater output will, [a] increase, [b] Decrease, [c] Remain same[d] Uncertain, 132. For a human body the hand to foot resistance is about………. ohm, [a] 100ohm, [b] 400ohm, [c] l000ohm, [d] 800ohm, , 133. A heater with short circuited heating element is tested with a series test lamp, the test lamp, will, [a] glow brightly, [c] glow normally, , [b] glow dim, [d] not glow, , 134. When a low resistance is connected in parallel with a high resistance, what is the combined, resistance?, [a] always more than the high resistance, [b] always less than the low resistance, [c] always between the high resistance and low resistance, [d] either lower or higher than low resistance depending on, the value of high resistance, 135. At higher frequencies, a capacitor acts as a:, [a] short circuit, [b] open circuit, [c] high reactance circuit [d] high resistance circuit, 136. One watt is same as:, [a] Ampere/sec, [b] volt/sec, [c] joules/sec, [d] ohm/sec, 137. Volt is :, [a] joule per second, [c]watt hour, , TECHNICAL ACADEMY, subengineer, 8, , [b] joule per coulomb, [d]Watt per hour, , 8113842763, , 8113842763 , 9020762726

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138. 1coulomb of charge =?, [a] 628* 1010, [b] 628* l016, 6, [c] 628* 10, [d] 628* 1030, 139. most preferred material for standard resistors:, [a] nichrome, [b] magnanin, [c] german silver, [d] platinum, 140. Two (1OOw, 220v) bulbs rated are connected in series and are connected to 440V.The total, power consumed is:, [a] 100W, [b] 200W, [c] 50W, [d] 25W, 141. Conductivity of aluminium is:, (A) 50% to that of copper (B) 40% to that of copper, (C) 60% to that of copper (D) 90% to that of copper, , 142. If a number of resistors are connected in parallel, the reciprocal of, The combined resistance is equal to the:, (A) Sum of the individual resistances, (B) Lowest resistance in the circuit, (C) Sum of the reciprocal of the individual resistances, (D) Highest resistance in the circuit, 143. Which one has negative temperature co-efficient of resistance?, (A) Copper, (B) carbon (C) aluminium, (D) iron, 144. Direction of magnetic field in a current carrying conductor is, Determined by:, (A) Lenz's law, (B) Fleming's right hand rule, (C) Flemings left hand rule (D) Ampere's right hand rule, 145. The potential gradient necessary to cause breakdown of an, Insulating medium is the, (A) Breakdown voltage, (B) break over voltage, (C) di-electric strength (D) destructing voltage, 146. Reciprocal of resistivity is known as, (A) Conductivity, (B) Specific resistance, (C) Conductance, (D) Specific resistivity, 147. Which of the following is the lightest?, (A) Electron, (B) Neutron, (C) Proton, (D) all have identical weight, 148. The resistance of wire is 2 ohm. If the diameter of the wire is, reduced to half, keeping the length same, then the resistance of the new wire will be:, (A) 1 ohm, (B) 2 ohm (C) 4 ohm (D) 8 ohm, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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149. Which of the following is the heaviest?, (A) Electron, (B) Neutron, (C) Proton, (D) all have same mass, 150. In a copper atom, first orbit contains:, (A) One electron, (B) Two electrons, (C) Eight electrons, (D) Eighteen electrons, 151. Unit of reactive power:, [a] VA, [b] VAR [c] Watt [d]ampere, 152. A multirange instrument (ammeter or voltmeter) has, [a] Multiple shunt or series resistances inside the meter, [b] variable coil turns, [c] multi -coil arrangement, [d] any of above, 153. The S.I unit of power is, [a]. henry, [b] coulomb [c] watt, 154. Electric pressure is also called, a. resistance b. power, c. voltage, , [d] watt-hour, d. energy, , 155. The substances which have a large number of free electrons and offer a low resistance are called, a, insulators, b. inductors, c. semi-conductors, d. conductors, 156. An instantaneous change in voltage is not possible in:, (A) resistor, (B) an inductor, (C) a capacitor, (D) a current source, 157. Superposition theorem is applicable only for circuits which are:, (A) Linear, (B) Non-linear, (C) Linear and Bilateral (D) Bilateral, 158. KVL states that the algebraic sum of the voltage drop around a, Closed loop in an electric circuit is:, (A) Equal to 1, (B) equal to the input voltage, (C) Equal to zero, (D) equal to 2, 159. When two capacitors C, andC2 are connected in series,, The equivalent value of capacitance is:, (A) CI + C2, (B) C1C2, (C) C1C2, [D] C1 C2/C1 +C2, 160. If the diameter of a metal wire of a given length is doubled, its, Resistance will, (A) Be doubled, (B) be halved, (C) Remain the same, (D) be ¼ th time, 161. One Joule is:, (A) 1 Watt sec, (C) 1 Ampere sec, , (B) 1 Volt sec, (D) None of the above, , 162. The total resistance of a 30 ohms resistor and a 60 ohms resistor, Connected in parallel is, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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(A) 20 ohms, , (B) 90 ohms (C) 45 ohms, , (D) 15 ohms, , 163. Value of mechanical equivalent of heat is, (A) 4.18 joules/calorie, (B) 4.18 joules, (C) 4.18 calories/joules, (D) 4.18 calories, 164. One Tesla equals:, (A) 1000 web/m2, (C) 3.14 web/AT, , (B) one web/m2, (D) one AT/M, , 165. Force of attraction or repulsion between two charged body is given by, (A) Charl's law, (B) Biot-Savarts law, (C) Coulomb's law, (D) Lenz'slaw, , 166. Out of the following which is not a poor conductor ?, a, Cast iron b. Copper, c. Carbon, d. Tungsten, 167. Out of the following which is an insulating material ?, a. Copper, b. Gold c. Silver d. Paper, 168. The property of a conductor due to which it passes current is called, a. resistance, b. reluctance, c. conductance d. inductance, 169. Conductance is reciprocal of, (a) resistance (b) inductance (c) reluctance, , (d) capacitance, , 170. The resistance of a conductor varies inversely as, (a) length, (b) area of cross-section (c) temperature (d) resistivity, 171. The sure test of electrification is, A. induction, B. friction, C. repulsion, D. attraction, 172. When electrician works on a power equipment, he should, Assume that the circuit is dead., A. always B. never, C. occasionally D. none of these, 173. Fire does not start with a current whose maximum value is, Less than……….mA., A.100, B.500, 0.1000, D. 5000, 174. Annealed copper offers, A.100% resistance at 234.5°C, B.100% conductance at 234.5°C, C. no change in resistance at 234.5°C, D. a little change in resistance at 234.5°C, 175. A bilateral element is, A. resistor, C. capacitor, , B. inductor, D. all of these, , 176. Average value of an unsymmetrical alternating quantity is, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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Calculated over the, A. whole cycle, B. half cycle, C. unsymmetrical part of the wave form, D. none of these, 177. When one leg of a parallel circuit gets opened out, the current, Drawn from the supply will, A. reduce, B. increase, C. remain the same, D. uncertain, 178. An ideal current source has zero, A. internal conductance B. internal resistance, C. voltage on no load, D. ripple, 179. Theorems applicable for both linear and non linear circuit is, A. Superposition theorem B. Thevenin 's theorem, C. Norton's theorem, D. None of these, 180. All the rules and laws which apply to dc networks also apply to ac, Networks consisting of, A. resistance, B. inductance, C. capacitance, D. all of these, 181. With rise in temperature the resistance of pure metals, (a) Increases, (b) decreases, (c) first increases and then decreases, (d) remains constant, 182. With rise in temperature the resistance of semi-conductors, (a) decreases, (b)increases, (e) first increases and then decreases, (d) remains constant, 183. Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel., The total resistance of the combination is, (a) 5 ohms (b) 10 ohms, (c) 15 ohms, (d) 55 ohms, 184. An instrument which detects electric current is known as, (a) voltmeter, (b) rheostat, (c) wattmeter, (d) galvanometer, 185. In a circuit a 33Ω resistor carries a current of 2 A, The voltage across the resistor is, (a) 33 V, (b) 66 V, (e) 80 V, (d) 132 V, 186. For determining of sign for emf a rise in potential should be considered, A. negative, B. positive, C. neutral, D. both positive and negative, 187. The resistance of a wire of diameter a and length l can be represented as, A. pI /v, B. pI3/v, C. pv/a3 D.pI2/V, 188. Melting temperature of soft solder is……………., A. 226°C, B.190°C, C.100°C, D. 320°C, 189. Type of insulation used for making panel board, A. Fibre B. Mica, C. Gutta Parcha, D. Slate, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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190. Eureka contains, A. 60% Cu + 40 Ni, C. 40% Cu + 60 Ni, , B. 60% Cu + 40 Cr, D. 60% Cu + 40Zn, , 191. Dielectric strength of mica is………….., A.12 -17 kv/mm, B. 20 -60 kv / mm, B.30 -40 kv/mm, D. 60 - 80 kv /milt, 192. Limiting temperature of class F insulating material is, A. 120°C, B. 130°C., C. 155°C, D. 180°C, , 193. The combined resistance of two equal resistors connected in, Parallel is equal to, A. twice the resistance of one resistor, B. Four times resistance of one resistor, C. 1/2 the resistance of one resistor, D. 1/4 the resistance of one resistor, 194. Between 1 mA to 20mA , electric shock will be, A. just bearable, B. painful, C. stop breathing, D. fibrillation of heart, 195. in a parallel combination of three resistances, the total resistance, Of a circuit is, [a] R1 + R2 +R3 =R, [B] R1 * R2 *R3 =R, [C] R1* R2 +R2 R3+R1 R3 [D] R1 R2 R3, R1 R2 R3, R1 R2 +R2 R3+R1 R3, 196. The ratio of voltage and electric current in a closed circuit, a, remains constant, b, varies, c, increases, d, falls, 197. The curve representing ohm's law is, a, sine function, b. Linear, c. a parabola, , d. a hyperbola, , 198. The resistance of a conductor having Length l area of cross section a and resistivity p is given, a. pa /1, b. p1/a, c. pla, d.1/p, 199. the resistance of wire varies inversely as, a, area of cross section, b. length c. resistivity, , d. temperature, , 200. Which of the following quantities are same in all parts of a series circuit?, a. voltage, b. power c. current, d. resistance, 201. Static electricity is produced by, A. chemical reaction, B. friction, C. induction, D. both friction, 202. Charge of electron is, A.1.6 x 10-18 C, C.I6 x 10-I9C, , and induction, , B.1.6x10-19C, D. 0.I6 x 10-19C, , 203. Electron-volt is the unit of:, A. Voltage, B. Energy, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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C. Current, , D. Power, , 204. The wire material used in rheostat is, A. Nichrome, B. Eureka, C. Platinum iridium, D. Tungsten, , 205. The condition in Ohm's law is, A. Ratio V/I should be constant, B. Current should be proportional to voltage, C. The temperature should be remaining constant, D. Temperature should vary, 206. The presence of an electric current is made known by, A. flashing, B. Effects produced, C. Cracking, D. Electric shock, 207. While removing the insulation of a cable, the knife is kept at an, Angle of……………to avoid nicks in the conductor., A. 20° B. 300, C. 90°, D. 60°, 208. Full name of S.W.G, A. Standard Wire Gas, C. Standard Wire Gauge, , B. Stranded Wire Gauge, D. Standard Width Gauge, , 209. Electrician knife has……………blades., A.one, B. two, C. three, D. no, 210. The temperature coefficient is represented in the form of..., A. ohm/°C, B. ohm/ohm/°C, C. ohm-ohm/°C, D. °C, 211. Which of the following statements is false in case of a series circuit?, a. the voltage drop across each resistor is same., b. the current flowing through each resistor is the same, C. applied voltage is equal to the sum of voltage drop, d. voltage drop across individual resistors are additive, 212. Three resistors, each of R ohms, are connected to from a triangle. The resistance between any, two terminals will be :, a.2/3 R, b.3/2 R, c. R, d. 3R, 213. Which of the following is not correct', 𝑃, a. P=V/R, b.P=VI, c.I=√( ) d.V=√𝑃𝑅, 𝑅, , 214. 10A 100W bulb is connected in series with a room heater, If now 100W bulb is replaced by a, 40W bulb, the heater output will:, a. increase, b. decrease c. remain the same d.cant be determined, 215. The voltage applied across an electric iron is halved. The power, consumption of the iron with be:, a .one-half, b .three-half, c .one-fourth, d. 1/√2𝑡𝑖𝑚𝑒𝑠, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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216. The diameter of an atom is about, (a) 10-10 m, (b), 108m, , (c) 1O-2, , (d) 10-15 m, , 217. One c.c of copper has about…………….free electrons at room temperature, (a) 200, (b) 20 x 1010, (c) 8.5 x 1022, (d) 3 x 103, 218. in an electric circuit electrons flow from a point of, (a) Lower potential to higher potential, (b) Higher potential to lower potential, (c) High altitude to low altitude, (d) None of these, 219. …………….Wire will give greater resistance, (a) Thick, (b) thin, (c) Either (a) or (b), (d) not defined, 220. The resistance of perfect insulator is equal to:, (a) Zero, (b) 50 mega ohms, (c) 100 mega ohms, (d) infinite, 221. for finding the resistance of a lamp when wattage and voltage is given, The formula used is…………., (a) W = V2 /R, (b) w=I2R, (C) W=VI, (d) I=V/R, 222. If the voltage across a load is to be dropped, a resistor should be placed in, (a) Series, (b) parallel, (c) Series – parallel, (d) none of these, 223. For a dc voltage an inductor, A. is virtually a short circuit, B. is an open circuit, C. depends on polarity, D. depends on voltage value, 224. The value of α (temperature co-efficient of resistance) depends up on, (a) Volume of the material, (b) length of the material, (c) Cross-sectional area of the material (d) nature of the material and temperature, 225. The hot resistance of an incandescent lamp is about……., Its cold resistance, (A) 10 times, (b) length of the material, (c) 100 times, (b) 50 times, 226. Resistance of 200w, 250v lamp will be, a . 625Ω, b. 1250 Ω, c. 312.5 Ω, , d.31.25 Ω, , 227. Two heaters rated at 1000w, 250v each are connected in series across a 250v 50Hz ac, supply. The total power drawn front the supply will be:, a. 1000w, b. 500w c. 250w, d.2000w, 228. Kirchhoff’s Laws are valid for, a. linear ckt only, b. passive time invariant ckt, c. non-linear ckt only d. both linear and non-linear ckt, 229. KCL is applicable only to, a. electric circuits, b. electronic circuits, c. junctions in a network, d. closed loop in a network, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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230. KVL is concerned with, a. IR drop, , b. battery emf, , c. junction node, , d. both a and b, , 231. Which of the following copper conductor will have least electrical, Resistance?, [a] short wire of CSA 2mm2, [b] short wire of CSA 3mm2, 2, [c] Long wire of CSA 2mm, [d]long wire of CSA 3mm2, 232. Which of the following insulator is most affected by heat?, [a] glass, [b] paper, [c] porcelain [d] PVC, 233. A wire connected directly across battery terminals act as a:, (a) High resistance, (b) medium resistance, (c) Normal resistance, (d) short-circuit, 234. Unit of reactive power is, A. VA, B. VAR, C. watt, , D. Elastance, , 235. The change in the resistance of a conductor per unit original, Resistance per degree rise in temperature is called:, (a) specific heat capacity, (b) temperature coefficient of resistance, (c) Resistance temperature ratio, (d) temperature correlation factor, 236. Which of the following stays the same in all parts of a series circuit?, (a) Voltage, (b) power (c) resistance, (d) current, 237. Which of the following stays the same in all parts of a parallel circuit?, (a) Voltage, (b) power (c) resistance, (d) current, 238. A 'short circuit' is that which, (a) Uses short pieces of wire, (b) Goes only a short distance, (c) Is used for dimming light, (d) Offers very low resistance path for current to flow, 239. Voltage is form of, (a) Potential energy, (c) Either (a) or (b), , (b) kinetic energy, (d) none of these, , 240. Pure metals generally. Have:, (a) High conductivity and low temperature coefficient, (b) High conductivity and large temperature coefficient, (c) Low conductivity and zero temperature coefficient, (d) Low conductivity and high temperature coefficient., 241. Cells are connected in series in order to increase the, [a] current capacity, [b] life of the cell, [c] voltage rating, [d] terminal voltage, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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242. Cells are connected in parallel in order to increase, [a] life of the cell, [b] efficiency, [c] current capacity, [d] voltage rating, 243. When two cells are connected in parallel, it should ensure that have, [a] identical internal resistance [b] equal emf, [c]same ampere hour capacity, 244. The capacity of a battery is expressed in, [a] amperes [b] amperes-hour, [c] watts, [d]watt- hour, 245. A series resonant circuit implies, [a] zero pf and maximum current, [b] unity pf and maximum current, [c] unity pf and minimum current, [d] zero pf and minimum current, 246. The resistors are normally specified by:, (a) Nominal value of the resistor, (b) Tolerance limit for the resistance. Value, (c) Loading capacity in watts, (d) All the above, 247. If an atom looses one or more electrons it becomes, (a) Electricity positive, (b) electrically neutral, (c) A neutral ion, (d) none of these, 248. One international ohm is equal to:, (a) 1.049 absolute ohm, (b) 1.00049 absolute ohm, (c) 0.99951 absolute ohm, (d) 0.951 absolute ohm, 249. A coil has a resistance of 100 Ω at 90°C. At 100°C, its resistance is, 101Ω. The temperature coefficient of the wire at 90°C is, (a) 0.01, (b) 0.1, (c) 0.0001, (d) 0.001, 250. For testing appliances, the. Wattage of test lamp should be:, (a) Very low, (b) low, (c) high, (d) any value, 251. Current velocity through a copper conductor is:, (a) Nearly 3 x 108 m/s, (b) Of the order of a few µ m/s, (c) Independent of current strength, (d) The same as propagation velocity of electric energy:, 252. Eureka has temperature co-efficient of resistance:, (a) Negative, (b) positive, (c)almost zero, (d) none of these, 253. Which of the following is a good conductor of electricity?, (a) Mica, (b) germanium (c) glass (not molten), (d) glass (molten), 254. Which of the following materials possesses least resistivity?, (a) Iron, (b) copper, (c) silver, (d) polythene, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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255. The power factor of an ordinary electric bulb is, A. zero, B. unity, C. slightly more than unity, D. slightly less than unity, 256. Which one is classified as integrating instrument?, [a] D’arsonval galvanometer, [b] ampere-hour meter, [c] ohm-meter, [d] ammeter, 257. Which of the following types of instrument is an integrating instrument?, [a] power factor meter, [b] energy meter, [c] watt meter, [d] frequency meter, 258. Voltmeter should be of very high resistance so that, [a] its range is high, [b] its accuracy is high, [c] it conduct current minimum possible [d] its sensitivity is high, 259. If a voltmeter is connected like a ammeter in series with a load, [a] the measurement reading will be too high [b] almost no current will flow in the circuit, [c] the meter will burn out, [d] an inadmissible high current will flow, 260. A light bulb drawn 300mA when the voltage across it is 240 V. the resistance of the light, Bulb is, [a] 400ohm, , [b] 600ohm, , 261. Ideal voltage source have, A. zero internal resistance, C. low value of voltage, , [c] 800 ohm, , [d] 1000ohm, , B. infinite internal resistance, d. large value of current, , 262. What is immaterial for an electric fuse is:, (a) Its resistivity, (b) its radius, (c) Its length, (d) the current flowing through it, 263. To neglect a voltage source, the terminals across the source are, A. open circuited, B. short circuited, C. replaced by some resisters D. replaced by inductor, 264. Energy consumed by a heater of rating 1000 watts by operating it for a, Period of 2 hours will be, (a) 1 unit, (b) 2 unit, (c) 2.5 unit, (d) 4 units, , 265. Linkage flux per unit current is called, A. capacitance, B. resistance, C. inductance, D. Capacitive reactance, 266. The safe current for the fuse wire of radius `r' is I. then, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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(a) Iα r1/2, , (b) I α r, , (c) I α r3/2, , (d) I α r2, , 267. The conductivity of a super conductor is………, (a) Very large, (b) very small, (c) infinite, , (d) zero, , 268. The electric current in a liquid is due to the flow of, (a) Electrons only, (b) positive ions only, (c) Negative and positive ions both, (d) Electrons and positive ions both, 269. In M.K.S. system one Kilo watt is equal to—, (a) 1.38 HP, (b) 1.33HP, (c) 1.5HP, (d) 1.66HP, 270. The resistance of 1 m length of 18 gauge copper wire is KΩ. The, Resistance of 1 m length of 24 gauge copper wire will be:, (a) K/2 Ω, , (B) 18/24 KΩ, , (C) KΩ, , (d) more than kΩ, , 271. The resistance of a parallel circuit consisting of two branches is 32 ohms. If the resistance Of one, branch is 18 ohms, what is the resistance of the other ?, (a) 18 ohm, , (b) 36 ohm, , (c) 48 ohm, , (d) 64 ohm, , 272. Four wires of same material, the same cross-sectional area and the same length when connected, in parallel give a resistance of 0.25Ω, if the same four wires are connected is series the effective, resistance will be, (a) 1 ohm, , (b) 2ohm, , (c) 3ohm, , (d) 4 ohm, , 273. current velocity through a copper conductor is, [a] the same as propagation velocity of electric energy, (b) independent of current strength, (c) of the order of a few micro meter /second, (d) nearly 3 x 108 m/s, 274. Which of the following material has nearly zero temperature co-efficient of resistance?, (a) manganin, (b) Porcelain, (c) Carbon, (d) Copper, 275. You have to replace 1500 ohm resistor in radio. You have no 1500 ohm resistor but have several, 1000 ohm ones which you would connect, (a) two in parallel, , (b) two in parallel and one in series, , (c) three in parallel, , (d) three in series, , 276. Which of the following is not bilateral element?, A. constant current source B. resistor, C. inductor, D. capacitance, 277. For a given line voltage, four heating coils will produce maximum, Heat when connected:, (A) all in parallel, (b) all in series, (c) With two parallel pairs in series, (d) One pair in parallel and the other two in series., 278. Production of heat due to current is related by which law?, (a) Ohm's law, (b) Joule's law, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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(c) Kelvin's law, , (d) Maxwell's Law, , 279. Metals approach super conductivity conditions:, (a) Near critical temperature (b) near absolute zero temperature, (c) At triple point, (d) Under the condition of high temperature and pressure, 280. A network having one or more than one source of emf is known as, A. passive, , B. active, , C. linear, , D. nonlinear, , 281. Two resistances are joined in parallel whose resultant is 6/5 ohm. One, Of the resistance wires is broken and the effective resistance becomes, 2 Ω Then the resistance in ohm of the wire that got broken was:, (A) 3/5, (b) 2, (c) 6/5, (d) 3, 282. In a circuit containing two unequal resistors connected in parallel:, (a) The current is the same in both the resistors, (b) A large current flow through the large resistor, (c) The voltage drop across both the resistances is the same, (d) The smaller resistance has smaller conductance., 283. with the rise in temperature the insulating property of an insulator:, (a) Weakness, (b) gains, (c) Remains unchanged (d) none of the above, 284. If the diameter of a conductor is doubled, it’s current conducting, Capacity becomes:, (a) One fourth, (b) doubled (c) half (d) four, 285. Two resistors of 10 Ω each are connected in series. A short is placed, Across the combination. The resistance of the circuit will be, (a) 20Ω, (b) 5Ω, (c) zero., (d) 2, 286. Two resistors are said to be connected in series when, (a) same current passes in turn through both, , (b) both carry the same value of current, , (c) total current equals the sum of branch currents, , (d) sum of IR drops equals the applied e.m.f., , 287. Which of the following statement is true both for a series and a parallel D.C. circuit?, (a) Elements have individual currents (b) Currents are additive, (c) Voltages are additive, , (d) Power are additive, , 288. Which of the following materials has a negative temperature co-efficient of resistance?, (a) Copper, (b) Aluminium, (c) Carbon, (d) Brass, 289. Ohm's law is not applicable to, (a) vacuum tubes, , (b) carbon resistors, , (c) high voltage circuits, , TECHNICAL ACADEMY, subengineer, 8, , (d) circuits with low current densities, , 8113842763, , 8113842763 , 9020762726

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290. Which is the best conductor of electricity ?, (a) Iron, (b) Silver, (d) Carbon, (c) Copper, 291. The electrical conductivity of metals is typically of the order of, (in ohm-' m-1), (a) 105, (b) 10-4, (c) 10-4, (d) 107, 292. All good conductors have high, (a) Resistance, (b) conductance, (c) Electrical conductivity (d) electrical and thermal conductivity, 293. The thickness of insulation provided on the conductor will depend upon, (a) The magnitude of current flowing through it, (b) The magnitude of voltage on the conductor, (c) None of above factors, (d) Both of above factors, 294. International ohm is defined in terms of the resistance of:, (a) A cube of carbon, (b) a cube of copper, (c) A column of mercury, (d) the unit length of metal wire, 295. An electric filament bulb can work from:, (a) AC supply, (b) DC supply, (c) Battery supply, (d) all of the above, 296. In absence of 150Ω resistor it can build with:, (a) Three 100 ohm resistors in parallel, (b) Two 100 ohm resistors in series, (c) Two 100 ohm in parallel with one 50 ohm in series, (d) Two 50 ohm in series and two 100 ohm parallel, 297. Volt denotes, (a) Newton/coulomb, (c) ampere/charge, , (b) work done/coulomb, (d) coulomb/charge, , 298. If the total current through a parallel combination of 2 ohm and 3 ohm is, 6A, current through 2Ω resistor, (a) 6 x 2/5 A, (b) 6 x 6/5 A (c) 6 x 3/5 A, (d) 6 x 3/6 A, 299. Which of the following statements is incorrect?, A. resistance is a passive element, B. inductor is a passive element, C. current source is a passive element, D. voltage source is an active element, 300. The force tending to move the electricity is called, (a) Potential difference (b) emf, (c) Current, (d) resistance, 301. For which of the following 'ampere second' could be the unit ?, [a] reluctance, (b) Charge (c) Power, (d) Energy, 302. All of the following are equivalent to watt except, (a) (amperes^2) x ohm, [b] joules/sec., , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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(c) amperes x volts, , (d) amperes/volt, , 303. A resistance having rating 10 ohms, 10W is likely to be a, (a) metallic resistor, (b) carbon resistor, (C) wire wound resistor, (d) variable resistor, 304. Which one of the following does not have negative temperature co-efficient ?, (a) Aluminium, , (b) Paper, , (c) Rubber, , (d) mica, , 305. varistors are, (a) insulators, (b) non-linear resistors, (c) carbon resistors, (d) resistors with zero temperature coefficient, 306. Specific resistance of a conductor depends upon, (a) Composition of the conductor, (b) Length of the conductor, (c) Area of cross section of the conductor, (d) Resistance of the conductor, 307. The ratio of voltage and current in a closed circuit remains:, (a) Constant, (b) increases, (c) Decreases, (d) varied, 308. Resistance of a material always decreases if, (a) Temperature of material is decreased, (b) Temperature of material is increased, (c) Number of free electrons available become more, (d) None of the above is correct, 309. Resistance of earth should be:, (a) High, (b) low, (c) Infinite, (d) the minimum possible, 310. According to fuse law, the current carrying capacity varies as:, (a) (Diameter)1/2, (b) (diameter)3/2, (c) I/diameter, (d) diameter, 311. The temperature coefficient of resistance of a wire is 0.0008°C. If the, Resistance of the wire is 8 ohm at 0°C, what is the resistance at 100°C?, A. 8.64 ohm, B. 8.08 ohm C. 7.92 ohm, D. 7.20 ohm, 312. Specific resistance of a conductor depends upon, A. dimensions of the conductor, B. composition of the conductor material, C. temperature of the conductor, D. both A and B, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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313. Electric pressure is also called the, (a) Resistance, (b) voltage, , (c) power, , (d) energy, , 314. The minimum requirements for causing flow of current are:, (a) A power source and a bulb, (b) A voltage source and a conductor, (c) A voltage source, a resistor and a switch, (d) A voltage source, a conductor, an ammeter and switch, 315. Flow of how many electrons per second will produce current of one, Ampere?, (A) 6.25x10^8, (b) 6.25x 1018, (c) 1.602x10^9 (d) 6.25x 10 19, 316. Insulating materials have the function of, (a) preventing a short circuit between conducting wires, (b) preventing an open circuit between the voltage source and the load, (c) conducting very large currents, (d) storing very high currents, 317. The rating of a fuse wire is always expressed in, (a) ampere-hours, (b) ampere-volts, (c) kWh, (d) amperes, 318. The minimum charge on an ion is, (a) equal to the atomic number of the atom, (b) equal to the charge of an electron, (c) equal to the charge of the number of electrons in an atom, (d) zero, 319. In a series circuit with unequal resistances, (a) the highest resistance has the most of the current through it, (b) the lowest resistance has the highest voltage drop, (c) the lowest resistance has the highest current, (d) the highest resistance has the highest voltage drop, 320. The filament of an electric bulb is made of, (a) carbon, (b) aluminium, (c) tungsten, (d) nickel, 321. A field of force can exist only between, (a) Two molecules, (b) two ions, (c) Two atoms, (d) two metal particles, 322. A substance whose molecules consist of dissimilar atoms is called, (a) Semi-conductor, (b) super-conductor, (c) Compound, (d) insulator, 323. Insulating materials have the function of, (a) Preventing a short circuit between conducting wires, (b) Preventing an open circuit between the voltage source and the load, (c) Conducting very large currents, (d) Storing very high currents, 324. The minimum charge on an ion is, (a) Equal to the atomic number of the atom, (b) Equal to the charge of an electron, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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(c) Equal to the charge of the number of electrons in an atom, (d) Zero, 325. In a series circuit with unequal resistances, (a) The highest resistance has the most of the current through it, (b) The lowest resistance has the highest voltage drop, (c) The lowest resistance has the highest current, (d) The highest resistance has the highest voltage drop, 326. If a parallel circuit is opened in the main line, the current, (a) Increases in the branch of the lowest resistance, (b) Increases in each branch, (c) Is zero in all branches (d) is zero in the highest resistive branch, 327. Electric shock is:, (a) Always fatal, (c) Sometimes fatal, , (b) never fatal, (d) always disfiguring, , 328. Which of the following conductor has lowest resistivity at 273° K?, (a) Aluminium (b) copper (c) brass (d) iron, 329. If a 220V heater is used on 110V supply heat produced by it will be as, …………much, (a) One-half (b) twice (c) one -fourth, (d) four times, 330. Which of the following materials has nearly zero temperature, Coefficient of resistance?, (a) Carbon, (b) porcelain (c) copper (d) manganin, , 331. 3 ohm resistor having 2 A current will dissipate the power of, (a) 2 watts, (b) 4 watts, (c) 6 watts, (d) 12 watts, 332. The resistance of a few metres of wire conductor in closed electrical circuit is, (a) practically zero, (b) low, (c) high, (d) very high, 333. If a parallel circuit is opened in the main line, the current, (a) increases in the branch of the lowest resistance, (b) increases in each branch, (c) is zero in all branches, (d) is zero in the highest resistive branch, 334. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes, (a) 0.4 ohm, (b) 0.6 ohm, (c) 0.8 ohm, (d) 1.0 ohm, 335. A glass rod when rubbed with silk cloth is changed because, (a) It takes In proton, [b] its atoms are removed, [c] it gives away electrons (d) it gives away positive charge, 336. A Small Portion of a 1000 W heater coil is broken. The power consumed by, The remaining portion which is connected to the same supply will be:, (A.) 1000 W, (B) less than 1000 W, (C) Greater than 1000 W (D) zero, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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337. Four lamps 40 W, 60 W, 100 W and 150 W of same voltage rating is, Connected in series and connected across the rated voltage., Which bulb will take more power?, (A) 150W (8) 100 W, (C) 60 W, (D) 40 W, 338. The reciprocal of time period is :, (A) Cycle (B) Power factor (C) Form factor (D) Frequency, 339. Two 100 W/220 V bulb connected in series and connected to 440 V., The total power consumed is:, (A) 200 W, (B) 100 W, (C) 50 W (D) 25 W, 340. When a voltage source is connected to a load, its terminal voltage, Falls due to:, A. high source impedance B. low source impedance, C. low source voltage, D. high load resistance, 341. The highest value attained by the current or voltage in a half cycle is, A. R.M.S. value, B. Periodic quantity, C. Average value, D. Amplitude, 342. What is the term used to identify an AC voltage that would cause the, Same heating in a resistor as a corresponding value of DC voltage?, A. cosine voltage, B. power factor, C. root mean square (RMS) D. average voltage, , 343. The example of non ohmic resistance is, A. copper wire, B. carbon resistance, C. aluminium wire, D. tungsten wire, 344. The resistance of human body is about, A. 200 Ω, B. 100 Ω, C.1000 Ω, D. 25 Ω, 345. Sparking occurs when a load is switched off because the circuit, Has high, (A) Resistance, (B) inductance, (C) Capacitance, (D) impedance, 346. Whether circuit may be AC or DC ,one following is most effective in reducing the magnitude of, the current, (a) Reactor, (b) Capacitor, (c) Inductor, (d) Resistor, 347. It becomes more difficult to remove, (a) any electron from the orbit, (b) first electron from the orbit, (c) second electron from the orbit, (d) third electron from the orbit, 348. When one leg of parallel circuit is opened out the total current will, (a) does not change, (b) increase, (c) decrease, (d) become zero, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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349. In a lamp load when more than one lamp are switched on the total resistance, (a) increases, (b) decreases, (c) remains same, (d) none of the above, 350. Two lamps 100 W and 40 W are connected in series across 230 V (alternating)., Which of the following statement is correct, (a) 100 W lamp will brighter, (b) 40 W lamp will glow brighter, (c) Both lamps will glow equally bright (d) 40 W lamp will fuse, 351. One mega ohm is equal to:, (A) 1 *103 ohm (B) 1*10 6ohm (C) 1*10-6 ohm (D) 1*10-3ohm, 352. The use of silver in electrical accessories is:, (A) Contact points, (B) Switch terminal, (C) Lamp terminal, (D) Wire, 353. The electrical conductor used in battery is:, (A) Gas, (B) Water, (C) Silver, (D) Aluminium, 354. One watt is defined as:, (A) Joule per second, (B) Joule second, (C) Joule minute, (D) Joule per minute, 355. The expression of Joule's law is:, (A) H = IR + Joules, (B) H = IR2 +Joules, (C) H= I2R + Joules, (D) H = IR/2 + Joules, 356. The unit of resistivity is:, (A) Ohm, (B) Ohm/metre, (C) Ohm-metre, (D) Mho, 357. When voltage reduces to 1/2, the power consumption of bulb, Becomes:, (A) Zero, (B) 1/4 times, (C) 1/2 times, (D) 2 times, 358. In power control circuit the resistors used are:, (A) Carbon resistors, (B) Metal resistor on ceramic base, (C) Wire wound resistor, ( D) Etched circuit resistor, 359. A circuit having current zero when load and supply is given is:, (A) Short circuit, (B) Open circuit, (c) (A) OR (B), (D) None of these, 360. A network having, no source of EMF is called:, (A) Passive network, (B) Active network, (C) Electric network, (D) none of these, 361. Resistance of 220 V, 100 W lamp will be, (a) 4.84ohm, (b)48.4 ohm, [c] 484 ohm, , (d) 4840 ohm, , 362. In the case of direct current, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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(a) magnitude and direction of current remains constant, (b) magnitude and direction of current changes with time, (c) magnitude of current changes with time, (d) magnitude of current remains constant, 363. When electric current passes through a bucket full of water, lot of bubbling is that the type of, supply is, (a) A.C, (b)D.C., (c) any of above two, (d) none of the above, 364. Resistance of carbon filament lamp as the applied voltage increases., (a) increases, (b) decreases, (c) remains same, (d) none of the above, 365. Bulbs in street lighting are all connected in, (a) parallel, (b) series, (c) series-parallel, (d) end-to-end, 366. In a parallel combination of four capacitors, 10 µF, 20 µF, 30µF and, 40µF, the maximum current passes through, A. 10 µF, B.20 µF, C. 4OµF, D. 30µF, 367. Material used as heater element, A. Tungsten, B. Nichrome, C Manganin, D. Silver, 368. In ……….resistance increases with temperature., A. Insulator, B. Semi conductor, C. Plastics, D. Metals, 369. The main difference between AC and DC is, AC changes, A. Direction, B. Magnitude, C. Voltage, D. Current, 370. The resistance of 100 watt 200 volt lamp is, (A) 100 Ω, (B) 400Ω, (C) 200Ω, (D) 800Ω, 371. The resistance of perfect insulator is:, (A) Zero, (B) 1Ω, (C) 20 Meg ohm (D) infinite, 372. The O.T.C. resistor is called:, (A) Thermistors, (B) Sensistors, (C) Varistors, (D) LDR, 373. The unit of quantity of electricity expressed in the SI unit, (A) Ampere/Second, (B) Coulomb, (C) Ampere/Minute, (D) Ampere/mm2, 374. The formula to find out the quantity of electricity is, (A) Voltage x Current, (B) Current x Time, (C) Power x Time, (D) Current x Resistance, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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375. Constantan wire is used for making rheostat because, (A) High specific resistance, (B) No change in resistance when temperature varies, (C) It is easily available, (D) It is an alloy, 376. For testing appliances, the wattage of test lamp should be, (a) very low, (b) low, (c) high, (d) any value, 377. Switching of a lamp in house produces noise in the radio. This is because switching operation, produces, (a) arcs across separating contacts, (b) mechanical noise of high intensity, (c) both mechanical noise and arc between contacts, (d) none of the above, 378. Sparking occurs when a load is switched off because the circuit has high, (a) resistance (b) inductance (c) capacitance (d) impedance, 379. Copper wire of certain length and resistance is drawn out to three times its length without, change in volume, the new resistance of wire becomes, (a) 1/9 times (b) 3 times, (c) 9 times, (d) unchanged, 380. When resistance element of a heater fuses and then we reconnect it after removing a portion of, it, the power of the heater will, (a) decrease, (b) increase, (c) remain constant, [d] none of the above, 381. According to Ohm's law, the relation between current, voltages, And resistance of a circuit is, A. I/V =R, B.VR=I, C. I2R =V, D. V/I =R, 382. Melting point of Tungsten filament is., A. 36000C, B. 3200°C, C. 34000C, D. 48000C, 383. In a D.C . Series circuit, A. voltage is same, B. current is same, C. voltage and current are same D. resistance is same, 384. Potential drop in a resistor is, A. VI, B.VR, C. IR, , D. V/R, , 385. The circuit through which current flows is called a……….circuit, A. Open, B. Series, C. Parallel, D. Closed, 386. in a parallel circuit, A. Voltage is same, B. Current is same, C. Voltage and current are same, D. Resistance is same, 387. One 60 W and one 100 W bulbs are connected in series. When the, Supply is given, A. 60 W bright less, B. 100 W brights more, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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C. Both brights equally, , D. 60 W brights more, , 388. At balance Wheatstone bridge galvanometer shows, A. High deflection, B . Low deflection, C. Null deflection, D. Maximum deflection, 389. in a junction ; X=3 A,Y=4A, Z= 8A. Find W if X and Z are, Incoming currents and W and Y are outgoing currents. W=, A. 15A, B. 9A C. 7A, D.1 A, 390. The resistivity of copper is, A. 10 -6 ohm m, B. 10-8 ohm m, -8, C. 10 m cm, D. 10-8 ohm mm, , 391. A field of force can exist only between, [a] two molecules, (b), two ions, (c) two atoms, (d) two metal particles, 392. A substance whose molecules consist of dissimilar atoms is called, [a]semi-contactor, (b) super-conductor, (c) compound, (d) insulator, 393. International ohm is defined in terms of the resistance of, (a) a column of mercury, (b) a cube of carbon, (c) a cube of copper, (d) the unit length of wire, 394. Three identical resistors are first connected in parallel and then in series. The resultant, resistance of the first combination to the second will be, (a) 9 times, (b) 1/9 times, (c) 1/3 times, (d) 3 times, 395. Which method can be used for absolute measurement of resistances ?, (a) Lorentz method, (b)Raleigh method, (c) Ohm's law method, (d) Wheatstone bridge method, 396.Law of conservation of energy is extended in, A. KCL, B. KVL, C. Lenz's law, D. Faraday's law, 397. Ampere is, A. Joules per coulomb, C. Coulomb per unit time, , B. joules per unit time, D. Coulomb per joule, , 398. The curve representing Ohm's law is, A. Sine function, B. Parabola, C. Cosine function, D. Linear, 399. Most preferred material for standard resistors, A. Nichrome, B. Platinum, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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C. German silver, 400. One kWH is equal to, A.3.6 x 108 Joule, C. 3.6 x106 Joule, , D. Manganin, , B. 36 x.10^6 Joule, D. 6.6 x 10^8 Joule, , 401. A glass rod when rubbed with silk cloth is charged because, A. it takes in proton, B. its atoms are removed, C. it gives away electrons, D. it gives away positive charge, 402. The total no. of basic SI units is, A. 4 B.5, C6, D.7, , 403. The quality of a capacitor can be expressed in terms of its, A. farad, B. power dissipation, C. size, D. none of these, 404. The opposition offered by a substance to the flow of electric current is called, A. voltage., B. power, C. current, D. resistance, 405. A uniform wire of resistance R is divided into 10 equal parts and all, of them are connected in parallel. The equivalent resistance will be, A.0.01 R, B. 0.1 R, C. 10 R, D. 100R, 406. 3 , 6 ohm resistors are connected to form a triangle. What is the resistance between any two, corner, (a)3/20 ohm [b]6 ohm, (c) 4 ohm, (d) 8/3 ohm, 407. Ohm's law Is not applicable to, (a) semi-conductor, (b) D.C circuit, (c) small resistors, [d] conductors, 408. Two copper conductor have equal length. The cross-sectional area of one conductor is four times, that of the other. if the conductor having smaller cross-sectional area has a resistance of 40, ohms the resistance of other conductor will be, (a) 160 ohms, (b) 80 ohms, (c) 20 ohms, (d) 10 ohms, 409. A nichrome wire used as a heater coil has the resistance of 2 ohm/m. For a heater of 1 kW at 200, V the length of wire required will be, (a) 80 m, (b) 60 m, (c) 40 m, (d) 20 m, 410. Temperature co-efficient of resistance is expressed In terms of, (a) ohms/°C, (b) mhos/ohm°C, (c) ohms/ ohm°C, (d) mhos/C, 411. A tolerance of 20% in the value of carbon resistor is represented by, (A) Gold band (B) black band, (C) Silver band, (D) without any band, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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412. Which is the best conductor of electricity?, (A) Carbon (B) Silver, (C) Copper, , (D) iron, , 413. When an electron is removed from an atom it becomes:, (A) a neutron (B) a proton, (C) a positive ion, (D) a negative ion, 414. with the rise in temperature; the resistance of carbon:, (A) Decreases (B) increases, (C) becomes zero, (D) remains unchanged, , 415. Two resistances of equal value, when connected in parallel give an, Equivalent resistance of R. If these resistors are connected in, Series, the equivalent resistance will be:, (A) R (B) 4 R, (C) 2 R (D) R/2, 416. According to modern electron theory, the last orbit of an atom, Cannot accommodate more than …………electrons., (A) 8, (B) 18, (C) 4, (D) 32, 417. The atomic weight and atomic number of copper are 64 and 29, Respectively. Therefore, a copper atom has:, (A) 35 protons, 35 electrons and 29 neutrons, (B) 35 protons, 29 electrons and 29 neutrons, (C) 29 protons, 35 electrons and 29 neutrons, (D) 29 protons, 29 electrons and 35 neutrons, 418. The electrons in the last orbit of an atom are called, A. free electrons, B. valance electrons, C. bound electrons, D. thermionic electrons, 419. Volt is the ornamental name for, A. Watt per hour. B. Joule second, C. Watt hour, D. joule per coulomb, 420. When electric current passes through a metallic conductor, its, Temperature rises. This is due to, (A) Collisions between conduction electrons and atoms, (B) The re lease of conduction electrons from parent atoms, (C) Mutual collisions between metal atoms, (D) Mutual collisions between conducting electrons, 421. Which of the following materials has the least resistivity ?, (a) Zinc, (b) Lead, (c) Mercury, (d) Copper, 422. When current flows through heater coil It glows but supply wiring does not glow because, (a) current through supply line flows at slower speed, (b) supply wiring is covered with insulation layer, (c) resistance of heater coil is more than the supply wires, (d) supply wires are made of superior material, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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423. The condition for the validity under Ohm's law is that, (a) resistance must be uniform, (b) current should be proportional to the size of the resistance, (c) resistance must be wire wound type, (d) temperature at positive end should be more than the temperature at negative end, , 424. Which of the following statement is correct ?, (a) A semi-conductor is a material whose conductivity is same as between that of a conductor and an, insulator, (b) A semi-conductor is a material which has conductivity having average value of conductivity of metal, and insulator, (c) A semi-conductor is one which conducts only half of the applied voltage, (d) A semi-conductor is a material made of alternate layers of conducting material and insulator., 425. A rheostat differs from potentiometer in the respect that it, (a) has lower wattage rating, (b) has higher wattage rating, (c) has large number of turns, (d) offers large number of tapings, 426. Ohm's law is applicable only when:, (A) Voltage is constant, (B) length is same, (C) Cross sectional area is same, (D) temperature is constant, 427. Ten numbers of 20 ohm resistors are connected in parallel across, a 220 V DC supply. The branch current is:, (A) 20 A, (B) 11 A, (C) 22A, (D) 110A, 428. 100 Farad capacitance is obtained by connecting 10 Farad capacitors:, (A) 10 Nos in series, (B) 10 Nos in parallel, (C) 10 Nos in series parallel (D) 100 Nos in series, 429. When two resistances are connected in series, they have :, (A) Same resistance values, (B) Same voltage across them, (C) Different resistance values, (D) Same current passing through them, 430. Newton-metre is the unit of :, (A) Energy, (B) torque, (C) Power, (D) work, 431. if a 220V heater is used on 110V supply, heat produced by it would be, (A) One-half (B) twice, (C) one-fourth (D) four times, 432. In resistance colour coding the value of 5 is represented by :, (A} Green colour, (B) Orange colour, (C) Brown colour, (D) Violet colour, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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433. One Coulomb of charge is equal to the charge on, (A) 628 x 1010, (B) 628 x 106, 16, (C) 628 x 10, (D) 628 x 1030, , ………… electrons., , 434. One Watt is same as :, (A) Ampere/sec, (B) Volt/sec, (C) joules/sec, (D) Ohm/sec, 435. in a parallel bank with unequal branch resistances:, (A) The current is highest in the lowest R, (B) The voltage is highest across the lowest K, (C) The current is highest in the highest R, (D) The current is equal in all branches, 436. The weight of an aluminium conductor as compared to a copper conductor of identical cross, section, for the same electrical resistance is, [a] 50%, [b] 60%, [c] 100%, [d] 150%, 437. An open resistors when checked with an ohm-meter reads, [a] zero, [b]infinite, (c) high but within tolerance (d) low but not zero, 438. ……….are the materials having electrical conductivity much less than most of the metals but, much greater than that of typical insulators,, (a) Varistors, (b) Thermistor, (c) Semi-conductors (d) Variable resistors, 439. All good conductors have high, (a) conductance, (b) resistance, (c) reluctance, (d)thermal conductivity, 440. Voltage dependent resistors are usually made from, (a)charcoal, [b]copper, (c)nichrome, [d] graphite, 441. A stove element draws 15 A when connected to 230 V line. How long does, It take to consume one unit of energy?, (A) 3.45 h, (B) 2.16 h, (C) 1.0 h (D) 0.29 h, 442. The unit of volume resistivity is, (A) ohm-m3/m2, (B)ohm-m2/m, (C) ohm-gram-m/gram, (D) ohm-m4/m3, 443. Keeping the length constant, the diameter of a wires is reduced to one half., The new resistance will be:, (A) One-fourth of the original (B) Hal f of the original, (C) 4 times of the original, (D) Two times of the original, 444. Two bulbs of 500 W and 200 W rated at 250 V will have resistance, Ratio as, (A) 4: 25, (B) 25: 4, (C) 2: 5 (D) 5: 2, 445. Which material have least resistivity?, (A) Copper (B) Mercury, (C) Zinc (D) Brass, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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446. For carbon resistance, what is the colour for 4?, (A) Green, (B) Yellow, (C) Black (D) Gray, 447. The length of a conductor is doubled and its area of cross section is also doubled., Then its resistance will be?, (A) Doubled, (B) remain unchanged, (C) Increase in four times, (D) decrease in four times, 448. Whether circuit may be AC. or D.C. one, following is most effective, In reducing the magnitude of the current., (A) Reactor, (B) Capacitor, (C) Inductor, (D) Resistor, 449. Three 6 ohm resistances are in the form of a triangle. The effective, Resistance between two corners of a triangle is……., (A) 3 ohm, (B) 4 ohm, (C) 6 ohm, (0)12 ohm, 450. When a low resistance is connected in parallel with a high, Resistance, the combined resistance is, (A) Always more than the high resistance., (B) Always less than the low resistance, (C) Always between the high resistance & -low resistance., (D) Either lower or higher than low resistance depending on the, Value of high resistance., , 451. According to Kirchhoff's first law current at a junction is:, (A) Sum of the incoming current, (B) sum of the voltages, (C) sum of the outgoing current, (D) zero, 452. The cost of running 3 kW load for 10 hours at 60 Ps / kWh is Rs ………, (A) Rs. 18, (B) Rs. 30, (C) Rs. 10, (D) Rs. 60, 453. For a given line voltage, four heating elements will produce, Maximum heat when connected in:, (A) All in series, (B) Two parallel pairs in series, (C)All in parallel, (D) One pair in parallel and other in series, 454. A closed switch has a resistance of, (A) Zero, (B) infinity, (C) About 10 Ω, (D) at least 1 kΩ, 455. The suppression capacitor used in starter along with fluorescent lamp is to:, (A) Improve power factor, (B) increase lumen output, (C) Reduce flickering, (D) reduce radio interference, 456. 1 newton is the same as, (A) 105 ergs, (B) 105 joules, (C) 105 dynes, (D) 105W, 457. At higher frequencies, a capacitor acts as a:, (A) short circuit, (B) open circuit, (C) High reactance circuit, (D) high resistance circuit, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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458. Specific resistance is the resistance offered between the two ends of, Material having:, (A) Volume of 1 cm3, (B) Area of 1 cm2and length 1 cm, (C) Diameter of 1 cm and length 1 cm, (D) Circumference of1 cm and length I cm, 459. The resistance of a conductor is inversely proportional to its:, (A) Cross sectional area, (B) Length, (C) Material, (D) Voltage, 460. One KWH equals nearly…………kCals., (A) 3600, (B) 860, (C) 4200, (D} 980, 461. Voltage dependent resistors are used, [a] for inductive circuits, (b) to supress surges ., (c) as heating elements, (d) as current stabilizers, 462. The ratio of mass of proton to that of electron is nearly, (a) 1840, (b) 184 (c) 30, (d) 4, 463. The number of electrons in the outer most orbit of carbon atom is, [a] 3, [b] 4, [c] 6 [d] 7, 464. With three resistances connected in parallel, if each dissipates 20W the total power supplied by, the voltage source equal, (a) 10w, (b) 20 W, (c) 40 W, (d) 60 W, 465. A thermistor has, (a) positive temperature coefficient, (b) negative temperature coefficient, (c) zero temperature coefficient, (d) variable temperature coefficient, 466. Valency of aluminium atom is, A .1 B. 2, C.3, D.4, 467. Resistance above………ohm is called high resistance, A. 1 mega ohm, B. 0.1 mega ohm, C. 10 kilo ohm D. 100 mega ohm, 468. Fourth colour band of a resistance is brown in four colour band, System, the tolerance of the resistance is, A. 2%, B. 5% C. 1% D. 3%, 469. The melting point of copper is, A. 2200 "C B. 660 °C, C. 1083 °C D. 360°C, 470. One Webber is equal to……… Maxwell, A.10000, B.100000, C. 1000000, 471. Lead is prepared from the ore of:, , TECHNICAL ACADEMY, subengineer, 8, , D.10000000, , 8113842763, , 8113842763 , 9020762726

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A. Bauxite, C. Hematite, , B. Blast, D. Galena, , 472. Gun metal is an alloy of …………and………., A. Copper, Aluminium, Zinc B. Copper, Tin, Zinc, C. Copper, Tin, Iron, D. Zinc, Tin, Iron, 473. Constantan is the alloy contain:, A. 60% copper & 40% tin, B. 40% nickel & 60% zinc, C. 40% copper & 60% Zinc D. 60% copper & 40% nickel, 474. Which variety of copper has the best conductivity?, A. Pure annealed copper., B. Induction hardened copper., C. Hard drawn copper., D. Copper containing traces of silicon., 475. Freezing point of mercury is, A. 35°C B. 36°C, C.38°C, 476. One litre of-water……., A. 980 gm, B. 1000 gm, , D.39°C, , C.930 gm, , D.910 gm, , 477. The quality of a good conductor is, A. any specific resistance, B. medium specific resistance, C. low specific resistance, D. high specific resistance, 478. The purpose of using flux in soldering is, A. It makes the solder to flow rapidly, C. It prevents oxidation, , B. It cleans the job, D. All the above, , 479. When a potential difference is applied to a resistor the heat is, Produced by, A. Due to the collision of free electrons with, the molecules or atoms of the resistor, B. Power dissipation, C. Speed of response, D. None of above, 480. On application of heat on electrolyte it exhibits, A. Positive temp. Coefficient B. No change in its resistance, C. Resistance will increase, D. Negative temp. Coefficient, 481. Dielectric strength of air is …………kv/mm, A. 2.5, B.25, C.3.2, D.16, 482. 18 SWG = ………. mm, A.122, B.1.42, C.0.91, , D.0.61, , 483. A source of emf is required in order to:, A. prevent the escape of electrons, B. insulate the electrons from the unbalanced atoms, C. get the electrons into motion, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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D. change the property of conductance into resistance, 484. A heater with short circuited heating element is tested with a series, Test lamp, the test lamp will, A. glow brightly, B. Glow dim, C. glow normally, D. not glow, 485. The unit of solid angle is, A. radian, B. steradian, C. degree, D. none of the above, 486. What is the temperature co-efficient value of aluminium at 20°, Celsius', A. 40.3 x 10-4 B.40.3 x10 -3, C. 40.3 x10-2, D. 40.3 x10-5, 487. One ampere-hour is equal to, A. 36000 Coulombs B. 3600 Coulombs, C. 360 Coulombs, D. 36 Coulombs, 488. Who discovered the neutron?, A. Faraday, B. Franklin, C. Rutherford D. Chadwick, 489. The speed of electricity is, A. 2, 97,842 Km/s, B. 2, 97,842 km/m, C. 2, 97, 842 km/hr, D. none of the above, 490. What is the di-electric strength in k.v./m.m of asbestos at 20°C, A.40 B.42, C.44, D.46, 491. The fuse unit is made from:, A. Bakelite, B. Porcelain, C. Ceramic, D. Iron, 492. Arc heating occurs When the air between electrodes of opposite, Polarity becomes, A. Moistened B. Dry, C. Ionized, D. None of the above, 493. Which one among Aluminium, Constantan, Mercury, Carbon have, Highest resistivity:, A. Aluminium B. Constantan, C. Mercury, D. Carbon, , 494. For a two terminal device, resistance decreases when the temperature, Increases, the device is:, A. made up of a metal B. a semiconductor, C. a dielectric, D. none of the above, 495. What type of flux is suitable for electrician's solder?, A. Zinc chloride, B. Tallow, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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C. Hydrochloric acid, , D. Resin, , 496. If I, R and t are the current, resistance and time respectively, then accounting to joules’s law, heat produced will be proportional to, (a) I2Rt, (b)I2R, 2, (c) I t, (d) I R2t, 497. Nichrome wire is an alloy of, (a) lead and zinc, (b) chromium and vanadium, (c) nickel and chromium, (d) copper and silver, 498. when a voltage of one volt is applied, a circuit allows one microampere current to flow through, it. The conductance of the circuit is, (a) 1 n-mho, (b), 10-6 mho, (c) 1 milli-mho, (d) none of the above, 499. Which of the following can have negative temperature coefficient ?, (a) Compounds of silver, (b) Liquid metals, (c) Metallic alloys, (d) Electrolytes, 500. Conductance : mho ::, (a) resistance : ohm, (c) inductance : farad, , (b), capacitance : henry, (d) lumen : steradian, , 501. A free electron means?, A. All the electrons in an atom, B. The electrons not belongs to the atom itself, C. Valence electrons which are loosely attached to the nucleus, D. All the above, 502. The speed with which the effect of emf is experienced at all parts of a, Conductor resulting the flow of current is, A .Velocity of charge, B. Velocity of propagation of electric field, C. speed of response, D. None of above, 503. The C.G.S. unit of heat is, A. Joule, B. Watt, C. Temperature, D. Calorie, 504. An open inductive coil has, A. 1000 ohm resistance B. Zero resistance, C. 100 ohm resistance D. Infinitive resistance, 505. The melting point of aluminium is, A. 810°C, B. 660 °C, C. 560°C D. 360°C, 506. Which type of resistors are called as thermistors?, A. PTC resistors, B. Varistors, C. LDR, D. NTC resistors, 507. For testing insulation resistance the most suited electrical supply is, A. Alternating current B. Direct current, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726

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C. Pulsating current, , D. Oscillating current, , 508. For a human body the ear to ear resistance is about……ohm, A. 100 ohm, B. 400 ohm, C. 1000 ohm, D. 800 ohms, 509. 1 kg weight =, A. 9 Newtons, C. 9.8 Newtons, 510. Torque=, A. force x acceleration, C. force x radius, , B. 10,8 Newtons, D. 8.5 Newtons, , B. force x distance, D. force x speed, , 511. Which variety of copper has the best mechanical strength?, A. Annealed copper. B. Hard drawn copper., C. Cast copper., D. Soft copper, 512. Which resistor will be physically larger in size?, A. 100 Ω, 10W., B. 10 Ω, 50 W., C. 1 M Ω, 1/2 W., D.1 k Ω,1 W., 513. Electric field intensity is:, A. scalar quantity, B. phasor quantity, C. vector quantity, D. none of the above, 514. Electrically charged atom is generally termed as:, A. Iron, B. Isotope, C. Ion, D. Cations, 515. Conventional flow of electric current is from:, A. + ve to - ve, B. -ve to +ve, C. Phase to neutral, D. Neutral to phase, 516. In a single phase system of supply, which of the following is used to, Test supply correctly?, A. Neon tester, B. Ammeter, C. Wattmeter D. Test lamp, 517. For a human body the hand to foot resistance is about …………….. Ohm, A. 100 ohm, B. 400 ohm, C. 1000 ohm D. 800 ohms, 518. The melting point of silver is, A.810°C, B. 660 °C, C. 960 °C, D. 360°C, 519. The diameter of the nucleus of an atom is of the order of, A. 10^-31 m, B. 10^-25 m, C.10^-21m, D.10^-14m, 520. What is the working temperature of a tungsten filament lamb?, A. 1600 °C, B. 1700 °C, C. 1800 °C, D.1000 °C, , TECHNICAL ACADEMY, subengineer, 8, , 8113842763, , 8113842763 , 9020762726