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1. The resistance of a wire isR, melted and stretched to n aeee ~~, length, its new resistance will be INEET 2017), , (a) nR R, )— (co) n?R woe, , 2. A potentiometer is an accurate and versatile, device to make electrical measurement of, EMF because the method involves, (a) cells, 5 potential gradients init, , ¢} a Condition of no current flow, galvanometer PoaPie, , (d) a combination of cells,, resistances ——, 5. The diagrams below show regions of, equipotentials, —, , , , , , , , , , 20Y 40¥ 20V 40V tOV30V apy OV, ttt Wealth 3), wV 30V 10¥30V any gov MYR, , ‘ an, ti) ti) Ci) (wv), , A positive charge is moved from A to B in, each diagram. {NEET 2017], {a) Maximurn work is required to move gq in, , figure (iil, {b) In all the four cases, the work done is the same, (c) Minimum work is required to move g in, , figure (i), (d) Maxirnum work is required to move gq in, , figure (ii), , 4. A potentiometer wire is 100 cm long and a, , constant potential difference is maintained, across 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 (b) 3:4 (oc) 3:2 (d)5:1, , 5. The potential difference (V4 — Vz) between, the points A and B in the given figure is, , [NEET 2016}, (a) -3V (O) +3V— (c) 46 (d) +9V, 7 2Q 2 a 12 Ys, wy] ww, Are 2A 3, , 6. A potentiometer wire has length 4 m and, resistance 8Q. ‘The resistance that must be, 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 AIPMT 2015}, fa)322 (40M (44D = (d)48Q, , 7. A,B and C are voltmeters of resistance R,, 1.5 R and 3H respectively as shown in the, figure. When some potential difference is, applied between X and Y, the voltmeter, readings are V4,Vp and Vz respectively., Then, ICBSE AIPMY 2015}, , -—@)—, 7 O—, _—_e—, (8) Ya =p = Ye, , (D) Vy # Vg =, (0) Vy.= Vp # VE Ou stet, , -——., , ¥

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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 (©) current, (c) drift velocity (d) e’ectric field, , 9. Two metal wires of identical dimensions, are connected in series. Ifo, and ©, are the, conductivities of the metal wires, respectively, the effective conductivity of, the combination is, , ICBSE AIPMT 2075], (a) 2% F> (0) St Se, 9; +O 20,90,, (cy + Se (4) 7152., G, Sz 9,+6,, , 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 cuil of, Tesistance 480 Q and a shunt of 20 Q, then, reading in the ammeter will be, , (CBSE AIPMT 2015], ()O5A (b)O.25A [)2A (1A, , 11. A potentiometer wire of length L and a, resistance r are connected in series with a, battery of e.m.f, Ey and a resistance 1. An, unknown e.m.f. is balanced at a length / of, the potentiometer wire. The e.m.f. F will, , be given by [CBSE AIPMT 2015], LE ey fol ee Fo! eg Lat, (a) Te Oe 7 t Oral, , 12. The resistances in the two arms of the, meter bridge are 5 Q and R Q, respectively., When the resistance R is shunted with an, equal resistance, the new balance point is, , at 1.6 /,. The resistance A, is, [CBSE AIPMT 2014], , 4)., 4 41}, , sa pa, , é, , Al, 100-1, 8, 102 (b)15SQ (c)20Q (dasa, , , , , , , , , , , , , , , , , , , , , , 13. A potentiometer circuit has been Set up for, finding the internal resistance of 4 piven,, cell. The main battery, used across the, potentiometer wire, has an emf of 2.0y and, a negligible internal resistance, The, potentiometer wire itself is 4m long, When, the resistance 7, connected across the, 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}, , is ICBSE AIPMT 2014), fa) 0.25.2 (b} 0.95 Q, a 052 (0) 0.75, , 14, In an ammeter 0.2% of main current passes, through the galvanometer. If resistance of, galvanometer is G, the resistance of, ammeter will be ICBSE AIPMT 2014), , 1 499 1 500, — —G ()—G (W)—6, a" (0) 0 ©) 95, , 15. A wire of resistance 4Q is stretched to, , twice its original length. The resistance of, , stretched wire would be INEET 2013), {aj2Q (b) 42, (8a {d)16.Q, , 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) 0.20 ib) 05.0, (c) 0.82 (d} 102, , 17. The resistances of the four arms P,Q,R and, 5 in a Wheatstone bridge are 10 Q, 30.2,, 30 Q and 90 Q, respectively. The emf and, internal resistance of the cell are 7 V and, 5 Q respectively. If the galvanometer, Tesistance is 50 Q, the current drawn from, , the cell will be [NEET 2013}, (a) 1.04 (b)O.2A, (c)O1A (d)20A, , 18. A millivoltmeter of 25 mV range is to be, converted into an ammeter of 25 A range., The value (in ohm) of necessary shunt, , will be {CBSE AIPMT 2012], (a) 0.001 (b) 0.01, (c) 1 (d) 0.05

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28., , 27. Awi a, 7. Awite of resistance 1292 me! is bent to form, , & complete circle of nudius 10 cm, The, Tsistance between its two diametrically, Opposite points A and Bas shown in the figure, is {CBSE AIPMY 2009}, , @M06zQ wH3Q ()6rQ (MHéQ, , , , , , , , , , , , font, , , , , , , , , , In the circuit shown, the current througlt, the 4 resistor is 1 A when the points P, and M are connected to a DC voltage source., The potential difference between the points, M and N is ICBSE AIPMT 2008}, , f15V ()10V (@)O5V (@)32Vv, , 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 ICBSE AIPMT 2008], , (1.02 (b)05Q (c)202 (d)zero, , 30. A wire of a certain material is stretched, , slowly by 10 percent. Its new resistance, and specific resistance become respectively, (a) 1.2 times, 1.1 times [CBSE AIPMT 2008}, (b) 1.21 times, same, , {c) Both remain the same, , (d) 1.1 times, 1.1 times, , 31. Three resistance P,Q, R each of 2 Q and an, , unknown resistance S form the four arms, of a Wheatstone bridge circuit: When a, resistance of 6 Q is connected in parallel to, , , , NE, , 8 the bridge gots balanwod, What is thy, , value of 8 7, , LCUSL Aj :, (aoa UPA 20,, , (b) oar (6a ony, , 32. ‘Tho resistance of an MnTHOLer 1G and, iH, , 33., , x, , its scalo is graduated for a current Upt, , A. Altor an additional shunt has he 10, connected to this ammetor i bocomus, possible to measure currants upto 750 4, this mater, The value of shunt tusistancy e, , (CBSE Alp, (a) 20.2 (yen vata, (c) 02 (d) 2 ka, Two cells, having the same aml are, , connected in series through an external, resistance #. Cells have internal resislangps, 4, and & (1, > 4) respectively, When the, circuit is closed, the potential difference, across the first call is zero. The value of g, is ICBSE AIPMT 2096, , tt Gmt, Ba-e mt () 7 Gate, In the circuit shown, if a conducting wire, , is connected between points A and B, the, , current in this wire will {CBSE AIPMT 2006), A, 4a 4Q, 12 32, 8, |, Vv, {a) flow from A to B, , (b) flow in the direction which will be decided by, the value of V, , (c) be zero, , (c) flow from B to A, , When a wire of uniform cross-section a,, length / and resistance f is bent into a, complete circle, resistance between two 0!, , diametrically opposite points will be, — [CBSE AIPMT 20051, , a R a «Oe, @£ wf © ;

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@ wo batteries, one of, , * nf 18V and internal, resistance 2 and the, other of emf 12 V and 20, jnternal resistance 1 Q, tv, , are connected as shown, L_12, , , , The voltmeter V will 12V, mone 9 reading of ICBSE Aipayr 2,, ia) (0) 30V (c) 14y {4} 18 ., , , A6 V battery is conn, # of a 3m long wire of ae = terminals, resistance of 100 Q. The eee and, potential between tw: © of, , © points on the wi, separated by a distance of 59 cm willbe., a2V (o)3¥, , (CBSE AIPMT 2004;, 38. Five equal resist shy iors, sistances each of resi:, are connected as shown in the ra A ;, battery of 4V volls is connected between A, and B. The current flowing in AFCER will, , be (CBSE AIPMT 2004], R A, o MA E, wv Vv Vv av, . i ees wk., as Os >A ar, , 39. n resistances each of r ohin, when, connected in parallel give an equivalent, resistance of R ohm. If these resistances, were connected in series, the combination, , would have a resistance in ohms, equal to, [CBSE AIPMT 2004), , (a) PR (ayn, , R R, (b) - () =, 40. The electric resistance of a certain wire of, , iron i tg Jenath and radius are both, doubled, io ene [CBSE AIPMT 2004], , (a) the resistance will be doubled and the specific, , resistance will be halved (0) the resistance will be halved and the specific, , d, resistance will remain unchange ific, (c) the resistance will be halved and the spec!, , il! be doubled 2 i, (d) Sota ped the specific resistance wil, , both remain unchanged, , 135, , 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% (bj) 80% (c) 90% (A) 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], , @a owen wk we, 4 2, 43. For a cell, the terminal potential difference, is 2.2V when circuit is open and reduces to, 1.8 V when cell is connected to a, resistance H = 5 Q, the internal resistance, (r) of cell is {CBSE AIPMT 2002], , 10 9 a 5, (a) — 2 =a — 2 =Q, a) 3 (0) ic (ce) 9 (a) 5, , 44, The specilic resistance of a conductor, increases with [CBSE AIPMT 2002), , (a) increase in lemperature, (b) increase in cross-sectional area, (c) decrease in length, (d) decrease in cross-sectional area, 45. Resistivity of potentiometer wire is, 10°? Q-m and its area of cross-section is, 10“ m?. When a current i = 0.1 A flows, , through the wire, ils potential gradient is, , [CBSE AIPMT 2001), (a) 107 Vim (b) 10° Vim, {c) 0.1 Vin (d) 10.Vim, , 46. \n a Wheatstone bridge resistance of each, of the four sides is 10 Q, If the resistance of, the galvanometer is also 10 Q, then, effective resistance of the bridge will be, , (CBSE AIPMT 2001), , (b)5Q (c)20Q {d) 402, , 47. Acell has an emf 1.5 V. When connected, across an external resistance of 2, the, terminal potential difference falls to 1.0 Vv., The internal resistance of the cell is, , {a) 102, , {CBSE AIPMT 2000], (a2Q (b) 152, (c) 1.00 (a) 0.52