1. The unit of electric current is:
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: B. Ampere
2. Which instrument is used to measure electric current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Answer: B. Ammeter
3. The unit of electric voltage is:
A. Ampere
B. Volt
C. Ohm
D. Joule
Answer: B. Volt
4. A voltmeter is connected in which manner in a circuit?
A. In parallel
B. In series
C. In both series and parallel
D. None of the above
Answer: A. In parallel
5. Which of the following is the unit of electrical resistance?
A. Ampere
B. Volt
C. Ohm
D. Watt
Answer: C. Ohm
6. An ohmmeter is used to measure:
A. Voltage
B. Current
C. Power
D. Resistance
Answer: D. Resistance
7. A wattmeter is used to measure:
A. Voltage
B. Current
C. Power
D. Frequency
Answer: C. Power
8. A digital multimeter (DMM) can measure which of the following?
A. Voltage
B. Current
C. Resistance
D. All of the above
Answer: D. All of the above
9. The instrument used to measure the power consumption of an electric device is called a:
A. Ammeter
B. Voltmeter
C. Wattmeter
D. Multimeter
Answer: C. Wattmeter
10. The principle of operation of an ammeter is based on:
A. Electromagnetic induction
B. Ohmâs law
C. Faradayâs law
D. Kirchhoffâs law
Answer: A. Electromagnetic induction
11. Which of the following tools is used to strip the insulation from wires?
A. Wire cutter
B. Soldering iron
C. Wire stripper
D. Clamp meter
Answer: C. Wire stripper
12. A soldering iron is primarily used to:
A. Cut wires
B. Connect wires by melting solder
C. Measure voltage
D. Tighten screws
Answer: B. Connect wires by melting solder
13. A clamp meter is used to measure:
A. Voltage
B. Current
C. Resistance
D. Power
Answer: B. Current
14. The instrument used to measure the frequency of an electrical signal is called a:
A. Oscilloscope
B. Frequency counter
C. Multimeter
D. Clamp meter
Answer: B. Frequency counter
15. The purpose of a fuse in an electrical circuit is to:
A. Protect the circuit from high current
B. Reduce voltage
C. Measure resistance
D. Conduct current
Answer: A. Protect the circuit from high current
16. The primary function of an oscilloscope is to:
A. Measure resistance
B. Measure current
C. Display electrical waveforms
D. Measure voltage
Answer: C. Display electrical waveforms
17. A test light is used to:
A. Measure resistance
B. Test the continuity of a circuit
C. Measure voltage
D. Test for current flow
Answer: B. Test the continuity of a circuit
18. An RCD (Residual Current Device) is used to:
A. Measure current
B. Disconnect power in case of leakage current
C. Measure voltage
D. Stabilize voltage
Answer: B. Disconnect power in case of leakage current
19. The tool used to tighten or loosen electrical terminals is called a:
A. Pliers
B. Screwdriver
C. Wrench
D. Clamp
Answer: B. Screwdriver
20. A megohmmeter is used to measure:
A. High resistance
B. Current
C. Power
D. Low resistance
Answer: A. High resistance