For the circuit shown in the figure, the current \(I\) will be:
1. | \(0.75~\text{A}\) | 2. | \(1~\text{A}\) |
3. | \(1.5~\text{A}\) | 4. | \(0.5~\text{A}\) |
Two batteries, one of emf \(18\) volts and internal resistance \(2~\Omega\) and the other of emf \(12\) V and internal resistance \(1~\Omega,\) are connected as shown. The voltmeter \(\mathrm{V}\) will record a reading of:
1. \(18\) V
2. \(30\) V
3. \(14\) V
4. \(15\) V
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. |
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 |
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) |
A charged particle having drift velocity of \(7.5\times10^{-4}~\text{ms}^{-1}\) in an electric field of \(3\times10^{-10}~\text{Vm}^{-1}\), has mobility of:
1. \(2.5\times 10^{6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
2. \(2.5\times 10^{-6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
3. \(2.25\times 10^{-15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
4. \(2.25\times 10^{15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
1. | increases by \(1\) V |
2. | decreases by \(1\) V |
3. | increases by \(3\) V |
4. | decreases by \(3\) V |