In order to quadruple the resistance of a uniform wire, a part of its length was uniformly stretched till the final length of the entire wire was 1.5 times the original length, the part of the wire was fraction equal to

(1) 1 / 8

(2) 1 / 6

(3) 1 / 10

(4) 1 / 4

Subtopic:  Combination of Resistors |
From NCERT
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In the circuit shown in figure reading of voltmeter is V1 when only S1 is closed, reading of voltmeter is V2 when only S2 is closed and reading of voltmeter is V3 when both S1 and S2 are closed. Then

(1) V3 > V2 > V1

(2) V2 > V1 > V3

(3) V3 > V1 > V2

(4) V1 > V2 > V3

Subtopic:  EMF & Terminal Voltage |
 66%
From NCERT
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Current through wire XY of circuit shown is :

(1) 1 A

(2) 4 A

(3) 2 A

(4) 3 A

Subtopic:  Kirchoff's Voltage Law |
 58%
From NCERT
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\(12\) cells each having the same emf are connected in series with some cells wrongly connected. The arrangement is connected in series with an ammeter and two similar cells which are in series. Current is \(3~\text{A}\) when cells and battery aid each other and is \(2~\text{A}\) when cells and battery oppose each other. The number of cells wrongly connected is/are:
1. \(4\)
2. \(1\)
3. \(3\)
4. \(2\)

Subtopic:  Grouping of Cells |
 51%
From NCERT
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Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will fit snugly within conductor A, and conductor C will fit snugly within conductor B. Relationship between their end to end resistance is

(1) RA = RB = RC

(2) RA > RB > RC

(3) RA < RB < R

(4) Information is not sufficient

Subtopic:  Derivation of Ohm's Law |
From NCERT
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In the following star circuit diagram (figure), the equivalent resistance between the points A and H will be

(1) 1.944 r

(2) 0.973 r

(3) 0.486 r

(4) 0.243 r

Subtopic:  Combination of Resistors |
 57%
From NCERT
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In the circuit of adjoining figure the current through 12 Ω resister will be

(1) 1 A

(2) 15A

(3) 25A

(4) 0 A

Subtopic:  Kirchoff's Voltage Law |
 81%
From NCERT
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The resistance of the series combination of two resistance is S. When they are joined in parallel the total resistance is P. If S = nP, then the minimum possible value of n is :

(1) 4

(2) 3

(3) 2

(4) 1

Subtopic:  Combination of Resistors |
 68%
From NCERT
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Which of the adjoining graphs represents ohmic resistance ?

(1)

(2)

(3)

(4)

Subtopic:  Derivation of Ohm's Law |
 87%
From NCERT
PMT - 1981
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Variation of current passing through a conductor with the voltage applied across its ends varies is shown in the diagram below. If the resistance \((R)\) is determined at points \(A\), \(B\), \(C\) and \(D\), we will find that:

1. \(R_C = R_D\) 2. \(R_B>R_A\)
3. \(R_C>R_B\) 4. None of these
Subtopic:  Derivation of Ohm's Law |
 58%
From NCERT
PMT - 1988
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