- 1(current)
Q. No.Two wires A and B of equal lengths and of same metal are taken. The diameter of wire A is half to that of wire B. If the resistance of wire A is 48 \(\Omega\), then resistance of wire B is:
1. 96 \(\Omega\)
2. 192 \(\Omega\)
3. 24 \(\Omega\)
4. 12 \(\Omega\)
1. 96 \(\Omega\)
2. 192 \(\Omega\)
3. 24 \(\Omega\)
4. 12 \(\Omega\)
Subtopic: Â Derivation of Ohm's Law |
 60%
From NCERT
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Hints
The potential difference \(V_{AB}\) (in volts) is plotted as a function of the resistance \(R.\) The graph is given by:
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4. |  |
Subtopic: Â Derivation of Ohm's Law |
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From NCERT
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Three resistors are connected to a \(20\) V battery with a constant voltage supply. One of the resistors is a variable resistor. The resistance of the variable resistor is gradually increased from \(0~\Omega\) to \(5\) \(\Omega.\)
Which graph correctly represents how the current drawn from the battery varies with the resistance \((R)\) of the variable resistor?
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2. |  |
| 3. |  |
4. |  |
Subtopic: Â Derivation of Ohm's Law |
 58%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Resistance of a conducting metallic wire depends on the voltage applied across it and current passing through it. |
| Reason (R): | Ohm's law is also valid for semiconductors. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Derivation of Ohm's Law |
 59%
From NCERT
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- 1(current)
Q. No.
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