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. RC = RD 2. RB > RA
3. RC > RB 4. None of these
Subtopic:  Derivation of Ohm's Law |
 58%
From NCERT
PMT - 1988
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The voltage V and current I graph for a conductor at two different temperatures T1 and T2 are shown in the figure. The relation between T1 and T2 is :

(1) T1 > T2

(2) T1T2

(3) T1 = T2

(4) T1 < T2

Subtopic:  Derivation of Ohm's Law |
 81%
From NCERT
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From the graph between current \(I\) and voltage \(V\) shown below, identify the portion corresponding to negative resistance 

1. \(AB\)
2. \(BC\)
3. \(CD\)
4. \(DE\)

Subtopic:  Derivation of Ohm's Law |
 81%
From NCERT
PMT - 1997
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I-V characteristic of a copper wire of length L and area of cross-section A is shown in figure. The slope of the curve becomes :

(1) More if the experiment is performed at higher temperature

(2) More if a wire of steel of same dimension is used

(3) More if the length of the wire is increased

(4) Less if the length of the wire is increased

Subtopic:  Derivation of Ohm's Law |
 57%
From NCERT
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E denotes electric field in a uniform conductor, I corresponding current through it, Vd drifts velocity of electrons and P denotes thermal power produced in the conductor, then which of the following graph is incorrect :

(1)

(2)

(3)

(4)

Subtopic:  Current & Current Density |
From NCERT
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The two ends of a uniform conductor are joined to a cell of e.m.f. E and some internal resistance. Starting from the midpoint P of the conductor, we move in the direction of current and return to P. The potential V at every point on the path is plotted against the distance covered (x). Which of the following graphs best represents the resulting curve

(1)

(2)

(3)

(4)

Subtopic:  EMF & Terminal Voltage |
 50%
From NCERT
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The resistance Rt of a conductor varies with temperature t as shown in the figure. If the variation is represented by Rt=R01+αt+βt2, then 

(1) α and β are both negative

(2) α and β are both positive

(3) α is positive and β is negative

(4) α is negative and β are positive

Subtopic:  Derivation of Ohm's Law |
 73%
PMT - 1988
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