Processing math: 100%

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 resistivity of iron is 1 × 10–7 ohm m. The resistance of iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm m will be :

1. 1 × 10–7

2. 2 × 10–7

3. 4 × 10–7

4. 8 × 10–7

Subtopic:  Derivation of Ohm's Law |
 68%
From NCERT
PMT - 1983
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The resistivity of a wire :

1. Increases with the length of the wire
2. Decreases with the area of cross-section
3. Decreases with the length and increases with the cross-section of the wire
4. None of the above statement is correct
Subtopic:  Derivation of Ohm's Law |
 73%
From NCERT
PMT - 1984
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Drift velocity vd varies with the intensity of the electric field as per the relation:
1. vdE
2. vd1E
3. vd=constant
4. vdE2

Subtopic:  Current & Current Density |
 79%
From NCERT
PMT - 1981
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In a conductor 4 coulombs of charge flows for 2 seconds. The value of electric current will be :

1. 4 volts

2. 4 amperes

3. 2 amperes

4. 2 volts

Subtopic:  Current & Current Density |
 90%
From NCERT
PMT - 1984
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The specific resistance of a wire is ρ, its volume is 3 m3 and its resistance is 3 ohms, then its length will be 

1. 1ρ

2. 3ρ

3. 1ρ3

4. ρ13 

Subtopic:  Derivation of Ohm's Law |
 80%
From NCERT
PMT - 1984
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