- 1(current)
Q. No.Temperature dependence of resistivity \(\rho(T)\) of semiconductors, insulators, and metals is significantly based on the following factors:
| (a) | number of charge carriers can change with temperature \(T\). |
| (b) | the time interval between two successive collisions can depend on \(T\). |
| (c) | length of material can be a function of \(T\). |
| (d) | mass of carriers is a function of \(T\). |
Which of the above statements is correct?
| 1. | (a, b) | 2. | (c, d) |
| 3. | (b, c) | 4. | (b, d) |
Subtopic: Â Derivation of Ohm's Law |
 75%
Level 2: 60%+
Hints
A metal rod of length 10 cm and a rectangular cross-section of \(1~ \text {cm} \times 1/2~ \text {cm}\) is connected to a battery across opposite faces. The resistance will be:
| 1. | maximum when the battery is connected across\(1~ \text {cm} \times 1/2~ \text {cm}\) faces. |
| 2. | maximum when the battery is connected across \(10~ \text {cm} \times 1~ \text {cm}\) faces. |
| 3. | maximum when the battery is connected across \(10~ \text {cm} \times 1/2~ \text {cm}\) faces. |
| 4. | same irrespective of the three faces. |
Subtopic: Â Derivation of Ohm's Law |
 60%
Level 2: 60%+
Hints
- 1(current)
Q. No.
© 2026 GoodEd Technologies Pvt. Ltd.