A solenoid is at the potential difference of \(60~\text V\) and the current flows through it is \(15~\text A\) then the resistance of the coil will be:
1. \(4~\Omega\)
2. \(8~\Omega\)
3. \(0.25~\Omega\)
4. \(2~\Omega\)

Subtopic:  Derivation of Ohm's Law |
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Level 1: 80%+
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The reciprocal of resistance is :

1. Conductance

2. Resistivity

3. Voltage

4. None of the above

Subtopic:  Derivation of Ohm's Law |
 84%
Level 1: 80%+
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All of the following statements are true except 

1. Conductance is the reciprocal of resistance and is measured in Siemens

2. Ohm's law is not applicable at very low and very high temperatures

3. Ohm's law is applicable to semiconductors

4. Ohm's law is not applicable to electron tubes, discharge tubes and electrolytes

Subtopic:  Derivation of Ohm's Law |
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Level 2: 60%+
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Which of the following has a negative temperature coefficient of resistance?

1. C

2. Fe

3. Mn

4. Ag

Subtopic:  Derivation of Ohm's Law |
 71%
Level 2: 60%+
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Masses of 3 wires of same metal are in the ratio 1 : 2 : 3 and their lengths are in the ratio 3 : 2 : 1. The electrical resistances are in ratio

1. 1 : 4 : 9

2. 9 : 4 : 1

3. 1 : 2 : 3

4. 27 : 6 : 1

Subtopic:  Derivation of Ohm's Law |
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PMT - 2002
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σ1 and σ2 are the electrical conductivities of Ge and Na respectively. If these substances are heated, then

1. Both σ1 and σ2 increase

2. σ1 increases and σ2 decreases

3. σ1 decreases and σ2 increases

4. Both σ1 and σ2 decrease

Subtopic:  Derivation of Ohm's Law |
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The resistance of a discharge tube is :

1. Ohmic

2. Non-ohmic

3. Both (1) and (2)

4. Zero

Subtopic:  Derivation of Ohm's Law |
 61%
Level 2: 60%+
PMT - 1999
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A copper wire has a square cross-section, 2.0 mm on a side. It carries a current of 8 A and the density of free electrons is 8 × 1028 m–3. The drift speed of electrons is equal to 

1. 0.156 × 10–3 m.s–1

2. 0.156 × 10–2 m.s–1

3. 3.12 × 10–3 m.s–1

4. 3.12 × 10–2 m.s–1

Subtopic:  Current & Current Density |
 60%
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A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/ quantities constant along the length of the conductor is/are :

1. Current, electric field and drift speed

2. Drift speed only

3. Current and drift speed

4. Current only

Subtopic:  Current & Current Density |
 58%
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PMT - 2001
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A wire of radius r has resistance R. If it is stretched to a radius of 3r4, its resistance becomes 

1. 9R16

2. 16R9

3. 81R256

4. 256R81

Subtopic:  Derivation of Ohm's Law |
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