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%
From NCERT
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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%
From NCERT
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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%
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%
From NCERT
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