In the circuit shown in  figure if power dissipated in 9Ω resistor is 144W, then potential difference across 3.6Ω resistor will be

1.  36V

2.  18V

3.  9V

4.  Zero

Subtopic:  Heating Effects of Current |
 64%
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A current of 1 mA is flowing through a copper wire. How many electrons will pass a given point in one second  e = 1.6 × 10-19 Coulomb

1.  6.25 × 1019  

2.  6.25 × 1015  

3.  6.25 × 1031  

4.  6.25 × 108

Subtopic:  Current & Current Density |
 78%
From NCERT
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The drift velocity of free electrons in a conductor is v when a current i is flowing in it. If both the radius and current are doubled, then the drift velocity will be:

1. v 2. v2
3. v4 4. v8
Subtopic:  Current & Current Density |
 73%
From NCERT
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A battery has emf 4 V and internal resistance r. When this battery is connected to an external resistance of 2 ohm, a current of 1 ampere flows in the circuit. How much current will flow if the terminals of the battery are connected directly?
1. 1 A 2. 2 A
3. 4 A 4. Infinite
Subtopic:  EMF & Terminal Voltage |
 66%
From NCERT
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The current I as shown in the circuit will be:

1. 10 A 2. 203 A
3. 23 A 4. 53 A
Subtopic:  Combination of Resistors |
 61%
From NCERT
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A meter bridge is set up to determine unknown resistance x using a standard 10 Ω resistor. The galvanometer shows the null point when the tapping key is at a 52 cm mark. End corrections are 1 cm and 2 cm respectively for end A and B. Then the value of x is:

      
1. 10.2 Ω
2. 10.6 Ω
3. 10.8 Ω
4. 11.1 Ω

Subtopic:  Meter Bridge |
 52%
From NCERT
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The sensitivity of a potentiometer can be increased by

1.  increasing the potential gradient

2.  decreasing the length of potentiometer wire

3.  decreasing the current in the potentiometer wire

4.  all of these

Subtopic:  Colour Coding of Resistors (OLD NCERT) |
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The resistance of platinum wire at 0°C is 22.05 Ω and at 100°C it becomes 22.70 Ω. When the wire is heated to a temperature of t°C the resistance of wire becomes 24.91Ω. The value of t is 

1.  220

2.  440

3.  310

4.  550

Subtopic:  Derivation of Ohm's Law |
 62%
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If I be the current limit of a fuse wire of length l and radius r, then select the appropriate relation

1. I α l

2. I α r2

3. I α l0

4. I α r0

Subtopic:  Heating Effects of Current |
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Which of the following graph correctly represents the variation of mobility (μ) of electrons with applied electric field (E) in a metallic conductor?

1.   2.
3. 4.
Subtopic:  Current & Current Density |
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