If the potential difference across ends of a metallic wire is doubled, the drift velocity of charge carriers will become:
1. double 
2. half
3. four times
4. one-fourth 

Subtopic:  Current & Current Density |
 84%
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The resistance between terminals \(A\) and \(B\) is:

        

1. \(5~\Omega\)
2. \(15~\Omega\)
3. \(10~\Omega\)
4. \(20~\Omega\)

Subtopic:  Combination of Resistors |
 67%
From NCERT
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What is the ratio of currents flowing in the resistors \(x\) and \(y\) of resistance \(10~\Omega\) each?
               
1. \(1\)

2. \(0.5\)

3. \(1.5\)

4. \(2.0\)

Subtopic:  Kirchoff's Voltage Law |
 62%
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What is the equivalent resistance between points \(a\) and \(b\), if the value of each resistance is \(R\)?

       

1. \(7R\) 2. \(5R\)
3. \(4R\) 4. \(3R\)
Subtopic:  Wheatstone Bridge |
 88%
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What is the value of current \(I\) in the network shown below?

   
1. \(2\) A 2. \(3\) A
3. \(4\) A 4. \(7\) A
Subtopic:  Kirchoff's Current Law |
 74%
From NCERT
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A current passes through a wire of variable cross-section in steady-state as shown. Then incorrect statement is:

     

1. Current density increases in the direction of the current.
2. Potential increases in the direction of the current.
3. Electric field increases in the direction of the current.
4. Drift speed increases in the direction of the current.

Subtopic:  Current & Current Density |
 55%
From NCERT
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The value of E (emf of the cell) in the circuit given below is:
  

1. 24 V 2. 32 V
3. 16 V 4. 8 V
Subtopic:  EMF & Terminal Voltage |
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Two cells of emf \(E\) and internal resistance \(r_1\) and \(r_2\) are connected in series through an external resistance \(R\). The value of \(R\) for which the potential difference across one of the cells becomes zero will be:

1. \(\dfrac{r_{1} r_{2}}{r_{1}   +   r_{2}}\) 2. \(r_{1} + r_{2}\)
3. \(|r_{1} - r_{2}|\) 4. \(\dfrac{r_{1}}{r_{2}}\)
Subtopic:  Grouping of Cells |
 57%
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In the given circuit diagram, \(3\) identical bulbs are connected. If bulb \(B_3\) get fused suddenly, how will the brightness of bulbs \(B_1\) and \(B_2\) change?
                

1. Brightness of bulb \(B_1\) will increase whereas brightness of bulb \(B_2\) will decrease
2. Brightness of bulb \(B_2\) will increase whereas brightness of bulb \(B_1\) will decrease
3. Brightness of both bulbs \(B_1\) and \(B_2\) will increase
4. Brightness of bulb \(B_1\) will increase whereas brightness of bulb \(B_2\) will remain the same 
Subtopic:  Heating Effects of Current |
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What is the reading of the voltmeter of resistance \(1200~\Omega\) connected in the following circuit diagram? 

         

1. \(2.5\) V

2. \(5.0\) V

3. \(7.5\) V

4. \(40\) V

Subtopic:  Combination of Resistors |
 67%
From NCERT
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