The current in a wire varies with time according to the relation \(i = (3+2t)~\text{A}\). The amount of charge passing a cross section of the wire in the time interval \(t=0\) to \(t = 4.0~\text{s}\)  would be: (where \(t\) is time in seconds)
1. \(28\) C 2. \(30.5\) C
3. \(8\) C 4. \(82\) C

Subtopic:  Current & Current Density |
 85%
From NCERT
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When the length and area of cross-section both are doubled, then its resistance :

1. Will become half

2. Will be doubled

3. Will remain the same

4. Will become four times

Subtopic:  Derivation of Ohm's Law |
 78%
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If 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\(\sqrt{T} \)
3. zero. 4. finite but independent of temperature.
Subtopic:  Current & Current Density |
 53%
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An electric wire of length ‘I’ and area of cross-section a has a resistance R ohms. Another wire of the same material having the same length and area of cross-section 4a has a resistance of :

1. 4R

2. R/4

3. R/16

4. 16R

Subtopic:  Derivation of Ohm's Law |
 75%
From NCERT
PMT - 1993
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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 |
From NCERT
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Express which of the following setups can be used to verify Ohm’s law 

1.  
2.
3.
4.
Subtopic:  Derivation of Ohm's Law |
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What is the resistance of a carbon resistance which has bands of colours brown, black and brown 

1. 100 Ω

2. 1000 Ω

3. 10 Ω

4. 1 Ω

Subtopic:  Colour Coding of Resistors (OLD NCERT) |
 70%
From NCERT
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The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance :

1. Length = 50 cm, diameter = 0.5 mm

2. Length = 100 cm, diameter = 1 mm

3. Length = 200 cm, diameter = 2 mm

4. Length = 300 cm, diameter = 3 mm

Subtopic:  Derivation of Ohm's Law |
 71%
From NCERT
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The current in the adjoining circuit will be 

1. 145ampere

2. 115ampere

3. 110ampere

4. 15ampere

Subtopic:  Combination of Resistors |
 82%
PMT - 1991
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The reading of the ammeter as per figure shown is

1. 18A

2. 34A

3. 12A

4. 2 A

Subtopic:  Combination of Resistors |
 72%
From NCERT
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