Q. No.The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter, the change in the resistance of the wire will be :
(1) 300%
(2) 200%
(3) 100%
(4) 50%
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The potential difference across 8 ohms resistance is 48 volts as shown in the figure. The value of potential difference across X and Y points will be :
(1) 160 volt
(2) 128 volt
(3) 80 volt
(4) 62 volt
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A, B, and C are voltmeters of resistance R, 1.5R, and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are VA, VB, and VC respectively. Then,
1. VA=VB=VC
2. VA≠VB=VC
3. VA=VB≠VC
4. VA≠VB≠VC
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A metallic block has no potential difference applied across it, then the mean velocity of free electron is (T = absolute temperature of the block) :
(1) Proportional to T
(2) Proportional to
(3) Zero
(4) Finite but independent of temperature
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If in the circuit shown below, the internal resistance of the battery is 1.5 Ω and VP and VQ are the potentials at P and Q respectively, what is the potential difference between the points P and Q
(1) Zero
(2) 4 volts (VP > VQ)
(3) 4 volts (VQ > VP)
(4) 2.5 volts (VQ > VP)
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In the circuit in the figure, if the potential at point A is taken to be zero, the potential at point B is :
1. -1V 2. +2V
3. -2V 4. +1V
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In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (consider given ammeter and voltmeter are not ideal) :
(1) Equal to 5 Ω
(2) Greater from 5 Ω
(3) Less than 5 Ω
(4) Greater or less than 5 Ω depends on the material of R
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A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true :
(1) Potential difference across the terminals of the battery is maximum when R = r
(2) Power delivered to the resistor is maximum when R = r
(3) Current in the circuit is maximum when R = r
(4) Current in the circuit is maximum when R >> r
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In the given circuit, with a steady current, the potential drop across the capacitor must be :
(1) V
(2) V / 2
(3) V / 3
(4) 2V / 3
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