Q. No.
The product of resistivity and conductivity of a cylindrical conductor depends on
1. temperature
2. material
3. area of cross-section
4. none of these.
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 |
In an electric circuit containing a battery, the charge (assumed positive) inside the battery:
| 1. | always goes from the positive terminal to the negative terminal. |
| 2. | may go from the positive terminal to the negative terminal. |
| 3. | always goes from the negative terminal to the positive terminal. |
| 4. | does not move. |
A resistor of resistance \(R\) is connected to an ideal battery. If the value of \(R\) is decreased, the power dissipated in the resistor will:
| 1. | increase | 2. | decrease |
| 3. | remains unchanged | 4. | can't be determined |
A current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions respectively.
1. K1 < K2
2. K1 = K2
3. K1 > K2
4. Any of these three may occur
Two resistors \(R\) and \(2R\) are connected in series in an electric circuit. The thermal energy developed in \(R\) and \(2R\) are in the ratio of:
1. \(1:2\)
2. \(2:1\)
3. \(1:4\)
4. \(4:1\)
Two resistances R and 2R are connected in parallel in an electric circuit. The thermal energy developed in R and 2R are in the ratio
1. 1 : 2
2. 2 : 1
3. 1 : 4
4. 4 : 1.
A uniform wire of resistance \(50~\Omega\) \(\) is cut into \(5\) equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is:
| 1. | \(2~\Omega\) \(\) | 2. | \(10~\Omega\) \(\) |
| 3. | \(250~\Omega\) \(\) | 4. | \(6250~\Omega\) |
Consider the following two statements:
| Statement I: | Kirchhoff’s junction law follows from the conservation of charge. |
| Statement II: | Kirchhoff’s loop law follows from the conservative nature of the electric field. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Statement I is correct but Statement II is incorrect. |
| 3. | Statement I is incorrect but Statement II is correct. |
| 4. | Both Statement I and Statement II are incorrect. |
Two non-ideal batteries are connected in series. Consider the following statements:
| A: | The equivalent emf is larger than either of the two emfs. |
| B: | The equivalent internal resistance is smaller than either of the two internal resistances. |
| 1. | Each of A and B is correct. |
| 2. | A is correct but B is wrong. |
| 3. | B is correct but A is wrong. |
| 4. | Each of A and B is wrong. |
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