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%
From NCERT
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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%
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The dependence of resistivity \((\rho)\) on the temperature \((T)\) of a semiconductor is, roughly, represented by:

1. 2.
3. 4.
Subtopic:  Derivation of Ohm's Law |
 64%
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Current through the \(2~\Omega\) resistance in the electrical network shown is:

      

1. zero 2. \(1\) A
3. \(3\) A 4. \(5\) A
Subtopic:  Grouping of Cells |
 77%
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A capacitor \(C\) is charged with the help of a resistance \(R\) as shown in the figure, Variation of \((V_{R}+V_{C})\) with time t is correctly shown in which of the options?
(\(V_{R}\) and \(V_{C}\) are instantaneous potential drops across \(R\) and \(C\) respectively).

            

1. 2.
3. 4.
Subtopic:  Kirchoff's Voltage Law |
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Two batteries, one of emf \(18~\text{V}\) and internal resistance \(2~\Omega\) and the other of emf \(12\) V and internal resistance \(1~\Omega\), are connected as shown. Reading of the voltmeter is:
(if voltmeter is ideal)

           

1. \(14\) V
2. \(15\) V
3. \(18\) V
4. \(30\) V

Subtopic:  Grouping of Cells |
 78%
From NCERT
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A current of \(2\) A is to be sent through a resistor of \(5 ~\Omega.\) Number of cells required in series, if each has emf \(2\) V and internal resistance \(0.5~\Omega,\) are:
1. \(40\)
2. \(30\)
3. \(20\)
4. \(10\)

Subtopic:  Grouping of Cells |
 76%
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