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NCERT Exemplar MCQs, , 1., , 4., , Two cells of emfs approximately 5 V and 10 V, , to be, , accurately compared using a potentiometer oflength 400, , (a) The battery that, , Consider a current carrying wire (current I) in the shape ofa, , runs, , voltage of 8V., , circle., , the, , Cm., potentiometer should nave, , (b) The battery of potentiometer can have a voltage of 15, , (a) source of emf, , and R adjusted so that the potential drop acro, wire slightly exceeds 10 V., , (b) electric field produced by charges accumulated on the, surface of wire, (c) the charges just behind a given segment of wire which, push them just the right way by repulsion, , (c) The first portion of 50 cm of wire itself should haye a, , Two batteries ofemf& and 6,(6,> e,) and internal resistances, r and r, respectively are connected in parallel as shown in, , (d) Potentiometer is usually used for comparing resistances, and not voltages., A metal rod of length 10 cm and a rectangular cross-section, , potential drop of 10V,, , (d) the charges ahead, , figure., , ww-, , 5., , oflemx, , 1, cm, , 2, , is connected to, , a, , battery, , acrOSs, , opposite, , faces. The resistance will be, (a) maximum when the battery is connected across I em, , B, , 2, , (a) Two, , 3., , equivalent emf E of the two cells is between e, and &,1.e., E&eq, (b) The equivalent emfeen is smaller than E, (c) The eq 1S given by E=E tE, always, (d) E is independent of internal resistances r, and I,, A resistance R is to be measured, using a meter bridge,, , 2, , (b) maximum when thebattery is connected across 10 cni l em, x, , faces, , (C) maximum when the, , student chooses the standard resistance S to be 1002. He, finds the null point at ,= 2.9 cm. He is told, to attempt to, , improve the accuracy., , Which of the following is a useful way?, (a) He should measure I, more accurately., , (b) He should, , change 5 to 1000,2 and repeat the experiment., c) He should change S to 3,2 and repeat the, experiment., d) He should given up hope of a more, accurate, mcasitrement with a meter bridge., , Cm facess, , 2, , 6., , battery is connected across, , 10em, , cm faces, , (d) same irrespective of the three faces, Which of the following characteristics of, , determines the current in a conductor?, , (a) Drift velocity alone, (b) Thermal velocity alone, (c) Both drift velocity and thermal velocity, nor thermal velocity, , (d) Neither drift, , cleet

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Past Year MCQs, , (a), (b), , 5, , 9., , (a), , zero, , (C), , 5A, , 15., , 20 V, , (b), (d), , 16., , 2A, 4A, , The cold junction of a thermocouple is maintained at 10°C., maintained at 530°C. The neutral temperature is, , AIIMS 2014, A], , 10., , 11., , 260CC, , (c), , 270°C, , (b), (d), , 265C, 520°C, , 17., , 18., , [AIPMT 2015, C], , 12., , LET, , (C), , (b), , 1.6, , 105Qmn, , 1.6 x 10*2m, , (d), , 1.6, , 10"2m, , A constant, , between the two ends of, , voltage is applied, , a, , it. The heat, uniform metallic wire. Some heat is developed in, [BITSAT, 2015, C], developed is doubled if, halved., are, wire, the, (a) both the length and the radius of, doubled., are, wire, ofthe, and the radius, both the, , length, , (c)the radius ofthe wire is doubled., (d) the length of the wire is doubled., varies with time, The charge flowing through a resistance R, constants. The, are, and, b, a, where, positive, t as Q= at, bt,, NEET 2016, C, BN], total heat produced in R is:, , (T+, , (d), , LEg, , a, , (b), , a, , R, , R, , (c), , (d), , a, , R, , 2b, b, 3b, 6b, A potentiometer, wire is 100 cm long and a constant potential, across, , it. Two cells, , are connected, , in series first to support one another and then in opposite, 10, direction. The balance points are obtained at 50 cm and, The, cases., two, in, the, wire, of, the, cm from the positive end, , 19., , NEET 2016, A], ratio of emf's is:, (d) 3:2, (b) 5:4, (c) 3:4, (a) 5:1, A current source drives a current in a coil of resistance R, , for a time t. The same source drives current in another coil, , of resistance R, for same time. If heat generated is same,, find internal resistance of source., AIIMS 2016, C, , The equivalent resistance between A and Bis, , AIIMS 2015, A], , A, , a'R, , difference is maintained, , balanced at a length I of the, r. An unknown e.m.f. E is, potentiometer wire. The e.m.f. E will be given by:, , Eo, , 1.6x 10 Qm, , (c), , (a), , A potentiometer wire of length L and a resistance r are, connected in series with a battery of e.m.f. E, and a resistance, , (6), , (a), , -, , In a large building, there are 15 bulbs of 40 W, 5 bulbs of, 100 W, 5 fans of 80W and 1 heater of 1 kW. The voltage of, electric mains is 220 V. The minimum capacity of the main, fuse of the building will be:, JEE Main 2014, A], (d) 14A, (b) 10A, (c) 12A, (a) 8A, , Eor, (r+r) L, , but Rcason, , If Assertion, , (b), , No thermo e.m.f. is developed when the hot junction is, , (a), , are correct., , length, thedrift speed, m, the resistivity, theelectron density in the wireis 8 102, JJEE Main 2015, A], to, close, is, material, ofthe, , 10 23, 2 2, ww, , Ifboth Assertion and Reason, , incorrect., is correct but Reason is, incorrect., are, Reason, and, Assertion, (d) Ifboth the, across a wire ol, is, difference, applied, When 5V potential, 0. I m,, ofelectrons is 2.5 10 ms. If, , (c), , AIIMS 2014, A], , 10, , correct and Rcason, , is not the correct explanation of Assertion., , net km is 8 volt and the average resistance per km is 0.5 Q., pe, Thepower loss in the wires is:, [AIPMT 2014, A], (d) 12.2 kW, (a) 19.2 W (b) 19,2kW (c) 19.2J, Find out the value of current through 2.Q resistance for the, , are, , is the correct explanation of Assertion., , Two citices are 150 km apat. Electric power is sent from one, , city to another city through copper wires. The fall of potential, , given circuit, , Ifboth Assertion and Reason, , (a), (c), , B, , 20., , NNN, , R, , RR2, , R +R2, zero, , (b), , R+ R2, , (d) RRR, , Twelve resistors each of resistance 162 are conneeted in, the circuit as shown. The net resistance between AB is, , AIIMS 2016. S], , (a), , (c), 13,, , 8R, , (b), , 3R, , (d), , 8, , 5R, , wwww.-, , 8, , wwwww, , 7R, w., , 8, , ww, , resistance of 4052. It, A potentiometer wire, 10 m long,, 1S Connected in series with a resistance box and a2 V storage, , has, , cell., , a, , Ifthe potential gradient along the, , the resistance unplugged in the box is, , (a), , 260Q, , (b), , (c), , 960Q, , (d), , ASSertion When current, , 760 Q, 1060 2, , through, , a, , wire is 0.I, , m, , V/cm,, , AIIMS 2015, A], 21., , by 0.5%., , (Power) which is directly proportional, , Sqiare of current., , 12, 32, , (b), , 202, , (d), , 42, , Assertion: The current density J at any point in ohmic, , resistor is in direction ofelectric ficld E at that point., bulb decreases, , the glow of bulb decreases by 1o., teason: Glow, , ww., , (a), (c), , to, , AIIMS 2015, C, , Reason: A point charge when released from rest in a rogion, having only electrostatic field always moves along electric, lines of force., LAIMS 2016. CI, (a), , If both Assertion and Reason are correet and Reason, is the correct explanation ofAssertion

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(b), , 1S not the correct, , (C), (d), 22., , K, , Ifboth Assertion and Reason are correct, but Reason, , (a), , explanation of Assertion., , IfASsertion is correct but Reason is incorrect., If both the Assertion and Reason are incorrect., , Assertion, , Bending a, , electrical measurements of E.M.F, because tH, , he method, , 23., , (a), , Potential gradients, condition of no current flow through the, A, (b), combination of cells,, A, and, (c), (d), 29., , 6V, , 12, , In the circuit shown in the figure, find the current in 45 2., , ww-, , 32, , 902, ww, , 002, , 24., , velocity, , -, , 5022, , 2.798x 10 m/sec., , (c), , 0.67 x 10, , m/sec, , Kirchoff's junction, , rule follows from, , loop rule follows from conservation of, , AIIMS 2017,C], , If both Assertion and Reason are correct and Reason, is the correct explanation of Assertion., b) If both Assertion and Reason are correct, but Reason, is not the correct explanation of Assertion., , cross-, , mcarrying a current of 20 A is., , (c) If Assertion is correct but Reason is incorrect., 31., , (d) Ifboth the Assertion and Reason are incorrect., Which of the following statements is false ?, , (b) 67.98 x 10 m/sec., , IJEE Main 2017, C, (a), , 6.798 x 10 m/sec., , conservation, , bridge if AC correspon ding to null deflection of, galvanometer is x, what would be its value if the radius of, the wire AB is doubled?, , A rheostat can be used as a potential divider, , (b) Kirchhoff's second law represents, , In the shown arrangement of the experiment of the meter, , R,, , 0A, , (a), , 502, , (d), , energy, , (c)Wheatstonebridge is the most sensitive when all the, four resistances, , BITSAT 2016, A], , are, , of the, , same, , order of magnitude, , In a balanced wheatstone, bridge if the cell and the, galvanometer are exchanged, the null point is, , disturbed., , R, , ww, , (d), , Reason Kirchoff's, , ofAg= 108, density of silver, BITSAT 2016, AJ, , (a), , 1.3A from P to Q, , momentum., , (b) 2.5A, (d) None of these, of electrons in silver wire with, , Given atomic weight, 10.5 x 10 kg/m'., , www-, , 2 32, , conservation of charge., , 5992 1002S, , sectional area 3.14 x 10, , (c), , Assertion:, , 30., , w, 1002, , (a) 4A, (c) 2A, The drift, , L9V, , (a) 0.13 A, from Q toP, (b) 0.13 A, from P to QQ, , 452, , 900, , stances, , AIMS 2017.A, , P 22, , IfAssertion is correct but Reason is incorrect., Ifboth the Assertion and Reason are incorrect., , 180V, , vanometer, , alvanometer, , Cells, , In the circuit shown, the current in the 1Q resistor is., , BITSAT 2016, S], , 25., , NEET 2017,0, , involvesS, , wire does not effect electrical, , If both Assertion and Reason are correct and Reason, is the correct explanation of, Assertion., If both Assertion and Reason are correct, but Reason, 1S not the correct, explanation of Assertion., , (c), (d), , (d) nR, , Jevice to mnake, , 28., , Reason: Resistance of wire is proportional ot resisti vity of, material, AIIMS 2016, C], , (b), , (c)2, , A potentiometer is an accurate and versatile deui., , resistance., , (a), , (b) nR, , 32., , ww, , In the circuit the current in each resistance is, , JEE Main 2017, A], A-I, , 26., , (a), (c), 27., , B, , C, , (b) x/4, (a), (d) 2x, (C)4x, Two resistances at 0° C with temperature coefficient of, resistance a and oa JOined in series act as a single resistance, in a circuit. The temperature coefticient of their, resistance will be, , td2, , (a) 0.5A, (b) 0A, , single, BITSAT 2016, A], (b) d1d2, td2, , (d) +d2, , The resistance of a wire is 'R' ohm. Ifit is melted and stretched, to'n' times its original length, its newresistance will be:, , NEET 2017, C], , c), , 12, , 1A, , (d) 0.25 A, 33., , In the given circuit diagram when the current reaches steady, state in the circuit,, , Cwill be:, , (a) CE, b) CE, (c), , (r+r,), +), , CE, , (d) CE, , (r,+), , the charge on the capacitor of capacitance, , 1JEE Main 2017, A

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Ameter bridge is set up as shown, to determine an unknown, , 38., , IesislanceX using a standard 10 ohm resistor. The, , series to a, , cm and2 cm, , respectively for the ends A and B. The determined value of, , battery, , BITSAT 2017, A], , X is, , (a), 39., , 102, , resistors,, , connected, current drawn is I. Now, the 'n' resistors are, parallel to the same battery. Then the current drawn fromn, INEET 2018, C], becomes 10 I. The value of'n' is, , galvanometer shows null point when tapping-key is at, 52 cm mark. The end-corrections are, , in, , of value 'R' eaclh,are connceteiThe, "R., battery ofemf'E'and internal resistance, in, , A set of'n' equal, , A, , 10, , (b), , (c), , 11, , (d), , 9, , battery consists of a variable number 'n' of identical, , series., , The terminals of the, , the current, , I is measured., , battery are, , Which of the, , correct relationship between I and n?, (a), , (b), , 10.2 ohm, , cells, , connected in, short-circuited and, , (having internal resistance 'r' each) which, , 6, , 20, , are, , graphs shows the, NEET 2018, C, , 10.6 ohm, , 10.8 ohm, (d) 11.1 ohm, In the circuit shown in figure th' e current through, , (c), , 15,, , 202, , 302, , w, , 82, , 9V, , (b), , (a), , 20, , -, , w, , n, , 82, , 40, , (d), , (c), , w, 22, , (a) the 3, , w22, , resistor is 0.50 A., , 22, , 40., , is an electric field within the conductor., Reason: The drift velocity of electron in presence of electric, , BITSAT 2017, A, , (b) the 3 Q resistor is 0.25 A., , field decreases., , (c)the4Qresistor is 0.50 A, , (a) Assertion is, , A wire is connected to a battery between the point Mand N, , as shown in the figure (1). The same wire is bent in the form, of a square and then connected to the battery between the, points M and N as shown in the figure (2). Which of the, , following quantities increases ?, , (1), , correct explanation for assertion, (C), , 41., , BITSAT 2016, A], , (a), , Wire., , (a), , Heat produced in the wire and current through the wire., , A carbon resistor of(47 + 4.7) kQis to be marked with rings, OI different colours for its identification. The colour code, , ()Yellow- Violet-Orange-Silver, ireen, , -Orange-Violet-Gold, , Yellow - Green - Violet-Gold, , NEET 2018, C], , 0.03AP, to P, , (d 0.27AP, to P, , and secondary in series will be, , wire and current through the wire., , a Violet-Yellow-Orange -Silver, , (b), , Two bulbs of 500W and 200 W are manufactured to operate, on 220 V line. The ratio of heat produced in 500 W and 200, W. in two cases, when firstly they are connected in parallel, , Heat produced in the wire, resistance offered by the, , Sequence will be, , 0.27 AP, to P, , (c) 0.03 AP, to P, , (b) Resistance offered by the wire and current through the, , 3, , 102 T i0, AIMS 2018, A, , (2), , the wire., , (d), , Assertion is correct, reason is incorrect, , (d) Assertion is incorrect, reason is correct., A 5V battery with internal, , resistance 22 and a 2V battery, with internal resistance 12 are, connected to a 102 resistor as 20, shown in the figure., The current in the 100 resistor is, , (a) Heat produced in the wire and resistance offered by, , (c), , AIIMS 2018, C], , correct, reason is correct; reason isa, correct explanation for assertion., (b) Assertion is correct, reason is corrcct; reason is not a, , (d) the 4 Q resistor is 0.25 A., 36., , Assertion: A current flows in a conductor only when there, , 43., , b), , (c), , AIIMS 2018, A, , (d), , 2, , On interchanging the resistances, the balance point of a, bridge shifts to the left by 10 cm. The resistancc of, , meter, , their series combination is 1k2. How much was the resistance, on the left slot before interchanging the resistance, , (a) 990 Q, , (b) 505 2, , (c), , JEE Main 2019,, 550, d 919

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44., , Two batieries with c.m.f. 12 V and 13 V are connected in, parallel across a load resistor of 1092.The internal resistances, ofthetwo batteries are 1 Q and22 respectively. The voltage, across the load lies between:, |JEE Main 2018, S], , (a) 11.6 Vand 11.7V, (c) 11.4 Vand 11.5V, 45., , (b) 11.5 Vand 11.6V, , (d) 11.7V and 11.8 V, , In a potentiometer experiment, it is found that no current, , through the galvanometer when the terminals of the, cell are connected across 52 cm ofthe potentiometer wire. If, the cell is shunted by a resistance of 5 Q, a balance is found, when the cell is connected across 40 cm ofthe wire. Find the, internal resistanceof the cell., JEE Main 2018, S], (b) 1.52, (a) 1, (c) 22, (d) 2.52, passes, , 46., , Seven resistances, each of value 20 2, are connected too a, be, , batteryas shown in thefigure., , The, , ammeter reading will, [BITSAT 2018, A], , (a), , 1/10A, , b) 3/10 A, 2V, , (d) 7/10 A., (c), 47. A 10V batterywith internal resistance 1Q and a 15V battery, with internal resistance 0.6 2 are connected in parallelto, 4/10A, , voltmeter (see figure). The reading inthe voltmeterwill be, , close to, (a), , 12.5V, , (b), , 245 V, , (c), , 13.1V, , (d), , 11.9V, , BITSAT, 2018, A], 10V, 12, , 15V, 0.62