When three identical bulbs are connected in series, the consumed power is \(10\) W. If they are now connected in parallel then the consumed power will be:
1. \(30\) W
2. \(90\) W
3. \(\frac{10}{3}\) W
4. \(270\) W

Subtopic:  Heating Effects of Current |
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In a hot wire ammeter due to the flowing of the current, the temperature of the wire is increased by \(5^{\circ}\) C. If the value of the current is doubled, then the increase in temperature will be:
1. \(15^{\circ}\) C
2. \(20^{\circ}\) C
3. \(25^{\circ}\) C
4. \(30^{\circ}\) C

Subtopic:  Heating Effects of Current |
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The current in \(8~\Omega\) resistance is (in the figure below):

   

1. \(0.69\) A
2. \(0.92\) A
3. \(1.30\) A
4. \(1.6\) A

Subtopic:  Kirchoff's Voltage Law |
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If the power dissipated in \(5~\Omega\) is \(20\) W then the power dissipated in \(4~\Omega\) is:
   
1. \(4\) W
2. \(6\) W
3. \(10\)
4. \(20\) W

Subtopic:  Heating Effects of Current |
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The value of \(R\) for which power in it is maximum is:    
   
1. \(3~\Omega\)
2. \(6~\Omega\)
3. \(12~\Omega\)
4. \(9~\Omega\)

Subtopic:  Heating Effects of Current |
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The terminal potential difference of a cell is greater than its emf when:

1. A battery of less emf is connected in its series.
2. A battery of higher emf is connected in its series.
3. A battery of higher emf is connected in its parallel.
4. A battery of less emf is connected in its parallel.
Subtopic:  EMF & Terminal Voltage |
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The net resistance of the circuit between \(A\) and \(B\) is:

   

1. \(\frac{8}{3}~\Omega\) 2. \(\frac{14}{3}~\Omega\)
3. \(\frac{16}{3}~\Omega\) 4. \(\frac{22}{3}~\Omega\)
Subtopic:  Wheatstone Bridge |
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A car battery of emf \(12~\text{V}\) and internal resistance \(5\times 10^{-2}~\Omega\) receives a current of \(60~\text{A}\) from an external source. The terminal voltage of the battery is:

1. \(12~\text{V}\) 2. \(9~\text{V}\)
3. \(15~\text{V}\) 4. \(20~\text{V}\)
Subtopic:  EMF & Terminal Voltage |
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If there are two bulbs of (\(40~\text{W},200~\text{V}\)), and (\(100~\text{W},200~\text{V}\)), then the correct relation for their resistance is:
1. \(R_{40}<R_{100}\)
2. \(R_{40}>R_{100}\)
3. \(R_{40}=R_{100}\)
4. no relation can be predicted

Subtopic:  Heating Effects of Current |
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According to the Faraday Law of electrolysis, the mass deposited at electrode will be proportional to:

1. m ∝ I2

2. m ∝ Q

3. m ∝ Q2

4. 'm' does not depend on Q

Subtopic:  Current & Current Density |
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