1. The power consumed in an electrical circuit is directly proportional
to:
A. Voltage and current
B. Resistance and current
C. Voltage and resistance
D. Voltage and frequency
Answer: a) Voltage and current
Rationale: The power consumed is given by P=V×IP = V \times
IP=V×I, where both voltage and current directly affect power
consumption.
2. What is the energy consumed in an electric circuit with a 100W light
bulb operating for 2 hours?
A. 100 J
B. 200 J
C. 200 Wh
D. 2000 Wh
Answer: c) 200 Wh
Rationale: Energy consumed is calculated by E=P×tE = P \times
tE=P×t, so E=100W×2h=200WhE = 100W \times 2h = 200
WhE=100W×2h=200Wh.
,3. What is the effect of increasing the temperature on the resistance of a
conductor?
A. Increases resistance
B. Decreases resistance
C. No effect
D. Causes current to reverse direction
Answer: a) Increases resistance
Rationale: As temperature increases, the atoms in the conductor vibrate
more, hindering the flow of electrons, thus increasing resistance.
4. Which of the following circuits can be used to measure current?
A. Parallel circuit
B. Series circuit
C. Open circuit
D. Closed circuit
Answer: b) Series circuit
Rationale: In a series circuit, current is the same throughout, so it is
easy to measure at any point in the circuit.
5. In a parallel circuit, if one resistor is removed, what happens to the
total resistance?
A. It increases
, B. It decreases
C. It remains the same
D. It becomes zero
Answer: a) It increases
Rationale: In a parallel circuit, removing a resistor increases the total
resistance since fewer paths are available for current.
6. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: c) Ohm
Rationale: The unit of electrical resistance is the ohm, which is defined
as the resistance that allows a current of one ampere to flow when a
voltage of one volt is applied across it.
7. Which of the following materials is a good conductor of electricity?
A. Rubber
B. Glass
C. Copper
D. Wood
to:
A. Voltage and current
B. Resistance and current
C. Voltage and resistance
D. Voltage and frequency
Answer: a) Voltage and current
Rationale: The power consumed is given by P=V×IP = V \times
IP=V×I, where both voltage and current directly affect power
consumption.
2. What is the energy consumed in an electric circuit with a 100W light
bulb operating for 2 hours?
A. 100 J
B. 200 J
C. 200 Wh
D. 2000 Wh
Answer: c) 200 Wh
Rationale: Energy consumed is calculated by E=P×tE = P \times
tE=P×t, so E=100W×2h=200WhE = 100W \times 2h = 200
WhE=100W×2h=200Wh.
,3. What is the effect of increasing the temperature on the resistance of a
conductor?
A. Increases resistance
B. Decreases resistance
C. No effect
D. Causes current to reverse direction
Answer: a) Increases resistance
Rationale: As temperature increases, the atoms in the conductor vibrate
more, hindering the flow of electrons, thus increasing resistance.
4. Which of the following circuits can be used to measure current?
A. Parallel circuit
B. Series circuit
C. Open circuit
D. Closed circuit
Answer: b) Series circuit
Rationale: In a series circuit, current is the same throughout, so it is
easy to measure at any point in the circuit.
5. In a parallel circuit, if one resistor is removed, what happens to the
total resistance?
A. It increases
, B. It decreases
C. It remains the same
D. It becomes zero
Answer: a) It increases
Rationale: In a parallel circuit, removing a resistor increases the total
resistance since fewer paths are available for current.
6. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: c) Ohm
Rationale: The unit of electrical resistance is the ohm, which is defined
as the resistance that allows a current of one ampere to flow when a
voltage of one volt is applied across it.
7. Which of the following materials is a good conductor of electricity?
A. Rubber
B. Glass
C. Copper
D. Wood
