- 1(current)
Q. No.A metallic resistor is connected across a battery. If the number of collisions of the free electrons with the lattice is somehow decreased in the resistor (for example, by cooling it), the current will:
| 1. | increase | 2. | decrease |
| 3. | remain constant | 4. | become zero |
Two resistors \(A\) and \(B\) have resistances \(R_A\) and \(R_B\) respectively with \(R_A < R_B .\) The resistivities of their materials are \(\rho_A\) and \(\rho_B\) is:
| 1. | \( ρ_A > ρ_B \) |
| 2. | \( ρ_A= ρ_B \) |
| 3. | \( ρ_A < ρ_B \) |
| 4. | The information is not sufficient to find the relation between \(\rho_A\) and \(\rho_B\) |
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
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. | \(6250~\Omega\) |
Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?
| (a) | drift speed |
| (b) | resistivity |
| (c) | resistance |
| (d) | the number of free electrons |
Choose the correct option:
| 1. | (d) only | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
- 1(current)
Q. No.
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