What is the equivalent resistance between points a and b, if the value of each resistance is R?
1. | 7R | 2. | 5R |
3. | 4R | 4. | 3R |
What is the value of current I in the network shown below?
1. | 2 A | 2. | 3 A |
3. | 4 A | 4. | 7 A |
A current passes through a wire of variable cross-section in steady-state as shown. Then incorrect statement is:
1. | Current density increases in the direction of the current. |
2. | Potential increases in the direction of the current. |
3. | Electric field increases in the direction of the current. |
4. | Drift speed increases in the direction of the current. |
The value of E (emf of the cell) in the circuit given below is:
1. | 24 V | 2. | 32 V |
3. | 16 V | 4. | 8 V |
Two cells of e.m.f. E and internal resistance r1 and r2 are connected in series through an external resistance R. The value of R for which the potential difference across one of the cells becomes zero will be:
1.
2.
3.
4.
In the given circuit diagram, 3 identical bulbs are connected. If bulb B3 get fused suddenly, how will the brightness of bulbs B1 and B2 change?
1. | Brightness of bulb B1 will increase whereas brightness of bulb B2 will decrease |
2. | Brightness of bulb B2 will increase whereas brightness of bulb B1 will decrease |
3. | Brightness of both bulbs B1 and B2 will increase |
4. | Brightness of bulb B1 will increase whereas brightness of bulb B2 will remain the same |
What is the reading of the voltmeter of resistance 1200 connected in the following circuit diagram?
1. 2.5 V
2. 5.0 V
3. 7.5 V
4. 40 V
The dependence of resistivity \((\rho)\) on the temperature \((T)\) of a semiconductor is, roughly, represented by:
1. | 2. | ||
3. | 4. |
Current through the \(2~\Omega\) resistance in the electrical network shown is:
1. | zero | 2. | \(1\) A |
3. | \(3\) A | 4. | \(5\) A |
Two batteries, one of emf 18V and internal resistance 2 and the other of emf 12 V and internal resistance 1 are connected as shown. Reading of the voltmeter is:
(if voltmeter is ideal)
1. 14 V
2. 15 V
3. 18 V
4. 30 V