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Q. No.As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:
1.
increases
2.
decreases
3.
remains constant
4.
may increase or decrease
Subtopic: Derivation of Ohm's Law |
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When no current is passed through a conductor,
| (a) | the free electrons do not move. |
| (b) | the average speed of a free electron over a large period of time is zero. |
| (c) | the average velocity of a free electron over a large period of time is zero. |
| (d) | the average of the velocities of all the free electrons at an instant is zero. |
Choose the correct option:
| 1. | (a) only | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
Subtopic: Current & Current Density |
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A uniformly increasing current flows through a \(30\) \(\Omega\) resistance, as shown in the graph.
The thermal energy generated in the resistance due to Joule heating is:
1. \(240\) J
2. \(480\) J
3. \(160\) J
4. \(320\) J
The thermal energy generated in the resistance due to Joule heating is:
1. \(240\) J
2. \(480\) J
3. \(160\) J
4. \(320\) J
Subtopic: Heating Effects of Current |
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In a Wheatstone Bridge arrangement, as shown in the figure, the bridge is balanced. However, when the resistances in the arms P, Q are switched, the bridge is balanced only when \(R\) is replaced by \(4R\) in the other two arms. If the value of R is \(100\) \(\Omega\), that of S is:
1. \(100\) \(\Omega\)
2. \(50\) \(\Omega\)
3. \(200\) \(\Omega\)
4. \(400\) \(\Omega\)
1. \(100\) \(\Omega\)
2. \(50\) \(\Omega\)
3. \(200\) \(\Omega\)
4. \(400\) \(\Omega\)
Subtopic: Wheatstone Bridge |
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A wire is connected to form an equilateral triangle ABC, each side having a resistance of \(4\) \(\Omega\). The vertex C is maintained at zero volts (\(V_C=0\)), and currents flowing in at A and B are as shown in the figure. The ratio of the potentials at D and E \(\Big(i.e.~\frac{V_D}{V_E}\Big)\) equals:
1. \(\frac31\)
2. \(\frac21\)
3. \(\frac11\)
4. \(\frac53\)
1. \(\frac31\)
2. \(\frac21\)
3. \(\frac11\)
4. \(\frac53\)
Subtopic: Kirchoff's Current Law |
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AB is a \(20\) \(\Omega\) resistor with a tapping point C that can be moved along AB. The resistances in AC, BC are proportional to the lengths AC, BC. Initially, C is at the mid-point of AB and the circuit is switched on.
If the tapping point C is moved so that the length BC is reduced to half its initial value, then the voltage across the \(15\) \(\Omega\) resistor,
If the tapping point C is moved so that the length BC is reduced to half its initial value, then the voltage across the \(15\) \(\Omega\) resistor,
| 1. | increases by \(1\) V |
| 2. | decreases by \(1\) V |
| 3. | increases by \(3\) V |
| 4. | decreases by \(3\) V |
Subtopic: Kirchoff's Voltage Law |
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Given below are two statements:
| Statement I: | The law of conservation of energy is valid in electric circuits. |
| Statement II: | Kirchhoff's junction law is applicable to electric circuits. |
| 1. | Statement I and Statement II are True and Statement I is the correct explanation of Statement II. |
| 2. | Statement I and Statement II are True and Statement I is not the correct explanation of Statement II. |
| 3. | Statement I is True, Statement II is False. |
| 4. | Statement I is False, Statement II is True. |
Subtopic: Kirchoff's Current Law |
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All the cells, shown in the figure below, are of \(2\) V, and all the resistances are \(1\) \(\Omega\). When a potential difference \(V\) is applied between A and B, the current through the circuit doubles compared to the situation when the potential difference is made zero.
Then,
Then,
| 1. | \(V=2\) volt, positive at A. |
| 2. | \(V=2\) volt, negative at A. |
| 3. | \(V=6\) volt, positive at A. |
| 4. | \(V=6\) volt, negative at A. |
Subtopic: Kirchoff's Voltage Law |
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All the resistances in the circuit shown below are \(2~\Omega.\) The equivalent resistance between \(A\) and \(C\) is:
1. \(4~\Omega\)
2. \(2~\Omega\)
3. \(\frac43~\Omega\)
4. \(\frac{10}3~\Omega\)
1. \(4~\Omega\)
2. \(2~\Omega\)
3. \(\frac43~\Omega\)
4. \(\frac{10}3~\Omega\)
Subtopic: Combination of Resistors |
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The current flowing through the left \(20~\Omega\) resistor is:
| 1. | \(1~\text A\) | 2. | \(0.5~\text A\) |
| 3. | \(2.5~\text A\) | 4. | \(3~\text A\) |
Subtopic: Kirchoff's Voltage Law |
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