Physics Alternating Current Online Mcqs Test

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Question 1

1. What is the frequency of AC used in the United States?

Question 2

2. In an inductor-only AC circuit, the voltage:

Answer

Leads current by 180°

Answer

Is in phase with current

Answer

Leads current by 90°

Answer

Lags current by 90°

Question 3

3. What is the result of applying AC through a pure resistor?

Answer

Voltage leads current

Answer

Current is zero

Answer

Voltage and current are in phase

Answer

Current leads voltage

Question 4

4. What happens when a capacitor is connected to an AC source?

Answer

It blocks current

Answer

It allows current with a phase lead

Answer

It acts like a resistor

Answer

It charges fully

Question 5

5. Which device is used to measure the frequency of AC?

Answer

Frequency meter

Question 6

6. In which part of the electromagnetic spectrum does visible light lie?

Answer

Between infrared and ultraviolet

Answer

Between X-rays and gamma rays

Answer

Between microwaves and radio waves

Answer

Between ultraviolet and X-rays

Question 7

7. Which of the following devices can cause a phase lead in an AC circuit?

Answer

Transformer

Question 8

8. What is the result of the vector addition of current and voltage in an RLC circuit?

Answer

Phase angle

Answer

Power factor

Question 9

9. The EM wave with the shortest wavelength is:

Answer

Ultraviolet

Answer

Gamma rays

Answer

Microwaves

Question 10

10. In which case is the power factor of an AC circuit maximum?

Answer

RC circuit

Answer

Pure resistor

Answer

Pure capacitor

Answer

Pure inductor

Question 11

11. Which EM wave is used in remote controls?

Answer

Infrared rays

Answer

Gamma rays

Answer

Radio waves

Question 12

12. What happens to the power factor in a purely inductive or capacitive circuit?

Answer

It remains unchanged

Answer

It becomes zero

Answer

It becomes negative

Answer

It becomes 1

Question 13

13. Which of the following AC circuit components stores energy in a magnetic field?

Question 14

14. Which of the following is true in a capacitive AC circuit?

Answer

Voltage lags current by 180°

Answer

Voltage leads current

Answer

Current leads voltage

Answer

Voltage and current are in phase

Question 15

15. Which wave has more energy than UV but less than gamma rays?

Answer

Radio waves

Answer

Microwaves

Question 16

16. What is meant by 'phase lag' in AC circuits?

Answer

Voltage and current are in phase

Answer

Current is ahead of voltage

Answer

Both occur simultaneously

Answer

Voltage is ahead of current

Question 17

17. Which electromagnetic wave is used in sterilizing surgical instruments?

Answer

Microwaves

Answer

Infrared rays

Answer

Radio waves

Answer

Ultraviolet rays

Question 18

18. Which of the following is not part of the electromagnetic spectrum?

Answer

Microwaves

Answer

Sound waves

Question 19

19. What is the phase difference in an AC circuit with only a capacitor?

Answer

No phase difference

Answer

Voltage leads current by 90°

Answer

Voltage leads current by 180°

Answer

Voltage lags current by 90°

Question 20

20. What causes phase difference in AC circuits?

Answer

Resistance only

Answer

Voltage drop

Answer

Only capacitance

Answer

Inductance and capacitance

Question 21

21. What is the purpose of phase analysis in AC circuits?

Answer

To measure voltage

Answer

To measure current

Answer

To calculate resistance

Answer

To understand power distribution

Question 22

22. The term “rms value” in AC stands for:

Answer

Root mean square

Answer

Resistance maximum supply

Answer

Radio mean speed

Answer

Radiant mechanical signal

Question 23

23. What is the unit of reactance in an AC circuit?

Question 24

24. Which property of AC allows it to be transmitted over long distances efficiently?

Answer

Can be converted to DC

Answer

Can be stepped up or down using transformers

Answer

Ability to reverse direction

Answer

Constant voltage

Question 25

25. Which electromagnetic wave has more penetrating power?

Answer

Ultraviolet

Answer

Gamma rays

Question 26

26. What is the phase relationship between current and voltage in an inductive AC circuit?

Answer

Voltage lags current

Answer

Voltage and current are in phase

Answer

Voltage leads current

Answer

Current leads voltage

Question 27

27. How does increasing the frequency affect capacitive reactance?

Answer

Becomes zero

Answer

Decreases it

Answer

Increases it

Question 28

28. Which part of the EM spectrum is used for cooking in microwave ovens?

Answer

Microwaves

Answer

Radio waves

Answer

Ultraviolet

Question 29

29. What is the significance of phase angle in an AC circuit?

Answer

Shows the strength of the current

Answer

Shows the time difference between voltage and current

Answer

Determines speed

Answer

Determines direction

Question 30

30. Which electromagnetic wave is responsible for sunburn?

Answer

Ultraviolet rays

Answer

Microwaves

Answer

Gamma rays

Question 31

31. In which component of an AC circuit does the current lead the voltage by 90°?

Answer

Transformer

Question 32

32. Which wave in the EM spectrum is used for medical imaging?

Answer

Gamma rays

Answer

Radio waves

Question 33

33. Which property is different among the different waves in the EM spectrum?

Question 34

34. How does a capacitor behave in a DC circuit after a long time?

Answer

Increases current

Answer

Discharges quickly

Answer

Acts as an insulator

Answer

Acts as a conductor

Question 35

35. Which of the following waves has the highest energy?

Answer

Radio waves

Answer

Visible light

Answer

Gamma rays

Question 36

36. In an AC circuit with only a resistor, what is the phase difference between current and voltage?

Question 37

37. What determines the impedance of an RLC circuit?

Answer

Resistance, inductance, and capacitance

Answer

Resistance and capacitance

Answer

Only inductance

Answer

Only resistance

Question 38

38. What happens to current in an inductive AC circuit?

Answer

Is in phase

Answer

Leads voltage

Answer

Lags voltage

Question 39

39. Which EM wave is used in cancer treatment?

Answer

Microwaves

Answer

Ultraviolet

Answer

Gamma rays

Question 40

40. Which EM wave is used in mobile communication?

Answer

Gamma rays

Answer

Microwaves

Question 41

41. Which of these quantities is the same for all types of EM waves in a vacuum?

Answer

Wavelength

Question 42

42. Which EM wave is used in night vision equipment?

Answer

Microwaves

Answer

Ultraviolet

Answer

Gamma rays

Question 43

43. Which of the following AC circuit components stores energy in an electric field?

Answer

Transformer

Question 44

44. Which EM wave has a frequency just above visible light?

Answer

Ultraviolet

Answer

Radio waves

Question 45

45. Which EM wave is used in radar systems?

Answer

Radio waves

Answer

Microwaves

Question 46

46. Which component in an AC circuit causes energy to be dissipated as heat?

Answer

Transformer

Question 47

47. When AC passes through a capacitor, it:

Answer

Reverses direction

Answer

Is blocked completely

Answer

Passes with phase lag

Answer

Passes with phase lead

Question 48

48. What is the waveform of typical alternating current?

Answer

Square wave

Answer

Triangular wave

Answer

Constant wave

Question 49

49. Which electromagnetic wave is used in satellite communication?

Answer

Gamma rays

Answer

Microwaves

Answer

Infrared rays

Question 50

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Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Alternating Current Online Mcqs Test

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