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1, The resistance of a wire is R ohm. If it is, melted and stretched to n times its original’, length, its new resistance will be [NEET 2017], nr (nr af, , n r, , 2. A potentiometer is an accurate and versatile, device to make electrical measurement of, EMF because the method involves, (a) cells INEET 2017], (0) potential gradients, (c} a condition of no current flow through the, , galvanometer, (4) a combination of cells, galvanometer and, , fesistances, 5. The diagrams below show regions of, equipotentials,, 2%V 40¥ 20V 40v 10V30V poy, , 40V, : 10V., Vv "3V 10V30V 20 40V =, , {) @ (i) cy, , A Dositive is moved from A to Bin, cath ay aad [NEET 2017], , (@) Maximum work is required to move q in, figure (ii), (0) In all the four cases, the work done is the same, (C) Minimum work is required to move q in, Figure (i), {€) Maximum work is required to move in, , ‘ figure (i) :, *4 Potentiometer wire is 100 cm long anc a, Sonstant potential difference is maintained, 88 it. Two cells are connected in series, , , , , , , , , , , , first to support one another and then in, opposite direction. The balance points are, obtained at 50 cm and 10 cm from the, positive end of the wire in the two cases., The ratio of emf is INEET 2016}, (a) 5:4 (0) 3:4 (c)3:2 (d) 5:1, , 5. The potential difference (V4 — Vg) between, the points A and B in the given figure is, , I[NEET 2016], () -3V) (D) +3V0 O(c) +6V 0 (dd) 49, Va 2Q - a 12 Va, —w——| be, Aim 2A B, , 6. A potentiometer wire has le: 4m, resistance 82. The Pi ee cae, connected in series with the wire and an, accumulator of emf 2V, so as to geta, potential gradient 1 mV per cm on the wire, is (CBSE AlPMT 2015], (a)32Q = (b)402 ()46Q dy aga, , 7. A, B and C are voltmeters of res, 1.5 Rand3R respectively as i —, figure. When some potential difference is, applied between X and Y, the voltmeter, readings are V,,,V, and V¢ respectively., , Then, (CBSE AIPMY 2015], —H)—, xO /+—, -—©)—_! it, @Y=yey, , Sake ure:

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8. Across a metallic conductor of, non-uniform cross-section, a constant, potential difference is applied. The, quantity which remain constant along the, , conductor is {CBSE AIPMT 2015], {a) current density (b) current, (c) drift velocity (d) electric field, , 9. Two metal wires of identical dimensions, are connected in series. Ifo, anda, are the, conductivities of the metal wires, , respectively, the effective conductivity of, the combination is, , (CBSE AIPMT 2015], 24,6 o.+ 6,, (a) ——1—2 et, 0,76, ®) 26,9;, (c) S14 Se @ 1%., GO; Op 5, + G2, , 10. A circuit contains an ammeter, a battery of, 30 V and a resistance 40.8 Q all connected, in series, If the ammeter has a coil of, Tesistance 480 Q and a shunt of 20 Q, then, reading in the ammeter will be, , [CBSE AIPMT 2015], (a)O.5A (D)O.25A (c)2A {dj 1A, , 11. 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 r,. An, unknown e.m.f. is balanced at a length / of, the potentiometer wire. The e,m.f. E will, , be given by {CBSE AIPMT 2015], (a) LEot to) A201 ie) Fol (a) Lo, , FA (reap il (r+q)f, , 12, The resistances in the two arms of the, meter bridge are 5 Q and R Q, respectively., When the resistance FR is shunted with an, equal resistance, the new balance point is, al 1.6 J,. The resistance R, is, , , , , , , , , , , , , , , , , , {CBSE AIPMT 2014}, 52 A, AL 100-1, 8, (a) 102 (K)15Q2 ()20Q (250, , 13. A potentiometer circuit has been bet Up fy, finding the internal resistance of 4 given, cell. The main battery, used acrogs the, potentiometer wire, has an emf of 2,9 Vang, a negligible internal resistance, The, potentiometer wire itself is 4 m long., the resistance A, connected across the given, cell, has values of (i) infinity, (ii) 9.5 Q,, the balancing lengths, on the, potentiometer wire are found to be 3 m and, 2.85 m, respectively., , The value of internal resistance of the cel,, , When, , is (CBSE AIPMT 2014), (a) 0.252 (b) 0.95 Q, (c)052 (d) 0.752, , 14, In an ammeter 0.2% of main current, , through the galvanometer. If resistance of, galvanometer is G, the resistance of, ammeter will be [CBSE AIPMT 2014}, , 1 499 1 500, —— amos —G (“ce, * 499 $ 500 ” * 499, , 500, 15. A wire of resistance 4Q is stretched to, twice its original length. The resistance of, stretched wire would be INEET 2013}, (29 (b) 49, (c)8Q (162, , 16. The internal resistance of a 2.1 V cell, which gives a current of 0.2 A through a, resistance of 10 Q is INEET 2013], , (a)0.2Q (b) 05, ()082 (d) 1.02, , 17. The resistances of the four arms P,Q,R and, , S in a Wheatstone bridge are 10 2, 302,, 30 Q and 90 Q, respectively. The emf and, internal resistance of the cell are 7 V and, 5 © respectively, If the galvanometer, resistance is 50 Q, the current drawn from, the cell will be [NEET 2013], (a) 1.04, , O2A, ()O1A , (d) 2.0A, 18. A millivoltmeter of 25 mV range is to be, ee into an ammeter of 25 A range:, @ value (in ohm) of necessary shunt, will be {CBSE AIPMT 2072), (a) 0.001 (b) 0.01, (c) 1 (d) 0.05

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181, , 19. In the circuit shown,, , , , , , , , , , the cells 4 and B ., ave negligible res 22. A galvanometer has a coil of resistance 100, n = mee and aon” TV, =12V, and gives a full scale deflection for 30 mA, galvanometer (G) shows no defi current, If it is to work as a voltmeter of 30, value of V, is election. The V range, the resistance required to be added, 7 (CBSE AtpMT 2012) will be [CBSE AIPMT 2010}, AAAA (a) 9002 = (b) 1800. (c) 5002 (a) 10000, 23. Consider the following two statements:, Vik = I. Kirchhoff's junction law follows from the, oT 3" Ve conservation of charge., Il. Kirchhoff’s loop law follows from the, ] conservation of energy., : Which of the following is correct?, @4V0 ()2V ray @6v [CBSE AIPMT 2010}, 20. A current of 2 A flows through a 2Q a ina a ae, resistor when connected across a battery, (c) Lis wrong and II is correct, ~ an battery supplies a current of 0.5 (@) Both | and Il are correct, Wiscn connected actoss a9 Q resistor, 24. The mean free path of electrons in a metal, The internal resistance of Taaieey is mm is 4x 10-* m. The electric field which can, {a) 1/9.Q (b) 1/4. “ny give on an average 2 eV energy to an, (1a (oso electron in the metal will be in unit of, 21. A potentiometer circuit is set up as shown. = x10" (b) 5 —, The potential gradient across the (0) 8x10" (d) 5x 107, potentiometer wire, is k volt/cm and the, ammeter, present in the circuit, reads 1.0A 25, Seo the electrical circuit shown in this, when two way key is switched off. Tha figure. Which of the following equations is, balance points, when the key between the a correct equation for it? [CBSE AIPMT 2009], terminals (a) 1 and 2 (b) 1 and 3, is plugged R, in, are found to be at lengths /,cm and cm, Tespectively. The magnitudes, of the _.. {6 ,, Tesistors R and X in ohm, are then equal, peo a, respectively to ICBSE AIPMT 2070}, fa, —]1|- ww oo ., , (a), -i; + i2)R i, =0, , (0) &2 - lap -& i, =0, ()-€2-(, + i)R+ign =0, (d)e,-(i, + i,)R+i,=0, , , , , , 26. A student measures the terminal potential, difference (V) of a cell (of omf e and, internal resistance r) as a function of the, , current (I) flowing through it. The slope, , , , , , , , : and intercept of the graph between V and J,, " kp -4) Tespectively, equal to {Case AIPMT 2009], (@) (1, — and aw (a) eand - + (b) - rande, Ok, ~ hand ki (d) kt, and hie (c)rand—e, , (@) -eandr

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ave, , S the bridge gets balanced. What is the, value of S? ICBSE AIPMT 2097,, 22 ()32 (©62Q2 Wig, , 27. Awire of resistance 12 2 m™ is bent to form, acomplete circle of radius 10 cm. The, resistance between its two diametrically, opposite points A and B as shown in the figure 32. The resistance of an ammeter is 13 .Q ang, IGBSEAIPMT 2009] its scale is graduated for a current upto 109, , A. After an additional shunt has been, connected to this ammeter it becomes, possible to measure currents upto 750 A by, , , , , , , , , , , , , , , , , , , , A 8 this meter. The value of shunt resistance is, [CBSE AIPMT 2097), (a) 202 (p22, (c) 02 Q (d)2kn, Se ae ee eee 33. Two cells, having the same emf are, 28. 4a connected in series through an external, AS resistance R, Cells have internal resistances, r, and 4, (1, > 5) respectively. When the, eS circuit is closed, the potential difference, across the first cell is zero. The value of R, oy aa is [CBSE AIPMT 2006), AAR @4-— (Ste CAH2 Wary, WAV oe 2 2, ; 34, In the circuit shown, if a conducting wire, , Osa is connected between points A and B, the, , current in this wi ill [CBSE AIPMT 2006), In the circuit shown, the current througlt a —— #, , the 4 Q resistor is 1 A when the points P A, and M are connected to a DC voltage source., The potential difference between the points, Mand N is {CBSE AIPMT 2008), (a15V (b)10Y (OSV (a) 32V, , 29. A cell can be balanced against 110 cm and, 100 cm of potentiometer wire, respectively, with and without being short circuited, through a resistance of 10 Q. Its internal, , , , resistance is [CBSE AIPMT 2008}, (J10Q ()O5N (c)200 § (d)zero, 30. A wire of a certain material is stretched (a) flow from A to B, slowly by 10 percent. Its new resistance (b) fiow in the direction which will be decided by, and specific resistance become respectively «) bt av, a) 1.2 times, 1.1 i, sma camera tenon, (c) Both remain the same 35. When a wire of uniform cross-section a,, (6) 1.1 times, 1.1 times length / and resistance F is bent into a, 31. Three resistance P,Q, R each of 2Q and an complete circle, resistance between two, unknown resistance § form the four diametrically opposite points will be, of a Wheatstone bridge circuit: When a sCaaE Aer, , resistance of 6 Q is connected in parallel to (a) & {b) 2 (c) 48 oe

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39. n resistances each 0, , 40. The electric resistance of, , 36. Two batteries, one of, , , , emf 18V and internal, resistance 2Q and the, other of emf 12 V and 1, , , , , , , , internal resistance 1 Q, 19 vay, are connected as shown., The voltmeter V will ev, record a reading of (CBS., , E AIPMT 2005,, (@15V ()30V )14V My tBy :, , 57. AG V battery is connected to the t, , ofa 3m long wire of uniform thickness end, resistance of 100 Q. The difference of, potential between two points on the wire, separated by a distance of 50 cm will be, , (CBSE AIPMT 2004], , (a)2V (b) 3V {c)1¥ (d) 1.5¥, , 38. Five equal resistances each of resistance R, , are connected as shown in the figure. A, battery of 4V volts is connected between A, and B. The current flowing in AFCEB will, , be {CBSE AIPMT 2004], R R, D V E, wv Vv vo @2t, av oF 9 ;, , fr ohm, when, , connected in parallel give an equivalent, , resistance of R ohm. If these resistances, , were connected,in series, the combination, , 4 , equal to, would have a resistance in OSE PMT oot, , R d) nF, (a) ne’R (b) s (c) 5 (d) 9, , iron is R. If its length, , doubled, then, , (a) the resistance wh ed iS ;, raaierone he specific, , (b) the resistance will be haved’ and the spe, resistance will remain une! non the specific, , (c) the resistance will ia, , (d) eee = * foe specitic resistance will, the resistance, -both remain unch, , and radius are bot, CBS!, , joubled and the specific, , , , sR!, , 41. A battery is charged at a potential of 15 V, for 8 h when the current flowing is 10 A., The battery on discharge supplies a current, of 5 A for 15 h. The mean terminal voltage, during discharge is 14 V. The watt-hour, efficiency of the battery is [CBSE AIPMT 2004], , (a) 82.5% (bd) 80% {c) 90% (o) 87.5%, , 42, In a Wheatstone bridge, all the four arms, have equal resistance A. If the resistance of, the galvanometer arm is also A, the, equivalent resistance of the combination as, seen by the battery is [CBSE AIPMT 2003}, , R aR, fa) FR (b)2A {c) a (d) 3, , 43. For a cell, the terminal potential difference, is 22V when circuit is open and reduces to, 1.8 V when cell is connected to a, resistance R =5 ©, the internal resistance, (x) of cell is [CBSE AIPMT 2002], , 10 9 a 5, =o —2 —2 (d=, @>2 O, 5 5, , 44, The specific resistance of a conductor, increases with [CBSE AIPMT 2002], , (a) increase in temperature, (b) increase in cross-sectional area, (c) decrease in length, (d) decrease in cross-sectional area, 45. Resistivity of potentiometer wire is, 1077 Q-m and its area of cross-section is, , 10-8 m?. When a current i = 0.1 A flows, through the wire, its potential gradient is, , [CBSE AIPMT 2001], (a) 10% Wim (bo) 10 Vim, (c) 0.4 Wim (d) 10 Vim, , 46. In a Wheatstone bridge resistance of each, of the four sides is 10 2. If the resistance of, the galvanometer is also 10 Q, then, , effective resistance of the bridge will be, [CBSE AIPMT 2001], , (aj10Q = (b) 5Q {(c)20Q = (a) 402, , 47. Acoll has an emf 1.5 V. When connected, across an external resistance of 2 2, the, terminal potential difference falls to 1.0 V, internal resistance of the cell is, The inte -" ance o! a AIPM 2000, , (b) 1.52, , 22, o (d)052, , (c) 1.00, , [es