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- 1. Multiple Choice
A cell of e.m.f. 2.0 V and negligible internal resistance is connected to the network of resistors shown.
V1 is the potential difference between S and P. V2 is the potential difference between S and Q.
What is the value of V1 – V2?
+0.50 V
+0.20 V
-0.20 V
-0.50 V
- 2. Multiple Choice
A circuit is set up with an LDR and a fixed resistor as shown.
The voltmeter reads 4 V.
The light intensity is increased.
What is a possible voltmeter reading?
3 V
4 V
6 V
8 V
- 3. Multiple Choice
A thermistor and another component are connected to a constant voltage supply. A voltmeter is connected across one of the components. The temperature of the thermistor is then reduced but no other changes are made.
In which circuit will the voltmeter reading increase?
A
B
C
D
- 4. Multiple Choice
In the circuit shown, the 6.0 V battery has negligible internal resistance. Resistors R1 and R2 and the voltmeter have resistance 100 kΩ.
What is the current in resistor R2?
20 x 10-6 A
30 x 10-6 A
40 x 10-6 A
60 x 10-6 A
- 5. Multiple Choice
The unknown e.m.f. E of a cell is to be determined using a potentiometer circuit. The balance length is to be measured when the galvanometer records a null reading.
What is the correct circuit to use?
A
B
C
D
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