Physics Alternating Current Online Mcqs Test

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Question 1

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

Answer

Radiant mechanical signal

Answer

Radio mean speed

Answer

Resistance maximum supply

Answer

Root mean square

Question 2

2. 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 3

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

Answer

Transformer

Question 4

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

Answer

Frequency meter

Question 5

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

Answer

Transformer

Question 6

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

Answer

Between X-rays and gamma rays

Answer

Between infrared and ultraviolet

Answer

Between microwaves and radio waves

Answer

Between ultraviolet and X-rays

Question 7

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

Answer

Radio waves

Answer

Microwaves

Question 8

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

Answer

Transformer

Question 9

9. Which electromagnetic wave is used in satellite communication?

Answer

Infrared rays

Answer

Microwaves

Answer

Gamma rays

Question 10

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

Answer

Radio waves

Answer

Ultraviolet rays

Answer

Microwaves

Answer

Infrared rays

Question 11

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

Answer

Voltage and current are in phase

Answer

Voltage is ahead of current

Answer

Both occur simultaneously

Answer

Current is ahead of voltage

Question 12

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

Answer

To calculate resistance

Answer

To measure voltage

Answer

To measure current

Answer

To understand power distribution

Question 13

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

Answer

It blocks current

Answer

It charges fully

Answer

It acts like a resistor

Answer

It allows current with a phase lead

Question 14

14. How does increasing the frequency affect capacitive reactance?

Answer

Increases it

Answer

Decreases it

Answer

Becomes zero

Question 15

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

Question 16

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

Answer

It becomes negative

Answer

It remains unchanged

Answer

It becomes zero

Answer

It becomes 1

Question 17

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

Answer

Wavelength

Question 18

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

Answer

Sound waves

Answer

Microwaves

Question 19

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

Question 20

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

Answer

Lags voltage

Answer

Leads voltage

Answer

Is in phase

Question 21

21. Which EM wave is used in cancer treatment?

Answer

Gamma rays

Answer

Microwaves

Answer

Ultraviolet

Question 22

22. What determines the impedance of an RLC circuit?

Answer

Only resistance

Answer

Resistance, inductance, and capacitance

Answer

Only inductance

Answer

Resistance and capacitance

Question 23

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

Answer

Pure resistor

Answer

Pure capacitor

Answer

Pure inductor

Answer

RC circuit

Question 24

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

Answer

Voltage lags current by 90°

Answer

Voltage leads current by 90°

Answer

No phase difference

Answer

Voltage leads current by 180°

Question 25

25. Which electromagnetic wave has more penetrating power?

Answer

Ultraviolet

Answer

Gamma rays

Question 26

26. Which EM wave is used in mobile communication?

Answer

Gamma rays

Answer

Microwaves

Question 27

27. Which electromagnetic wave is responsible for sunburn?

Answer

Microwaves

Answer

Ultraviolet rays

Answer

Gamma rays

Question 28

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

Answer

Transformer

Question 29

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

Answer

Voltage and current are in phase

Answer

Voltage leads current

Answer

Current is zero

Answer

Current leads voltage

Question 30

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

Answer

Microwaves

Answer

Ultraviolet

Answer

Radio waves

Question 31

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

Answer

Gamma rays

Answer

Radio waves

Question 32

32. When AC passes through a capacitor, it:

Answer

Passes with phase lead

Answer

Passes with phase lag

Answer

Is blocked completely

Answer

Reverses direction

Question 33

33. Which EM wave is used in remote controls?

Answer

Gamma rays

Answer

Infrared rays

Answer

Radio waves

Question 34

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

Answer

Power factor

Answer

Phase angle

Question 35

35. What is the waveform of typical alternating current?

Answer

Constant wave

Answer

Triangular wave

Answer

Square wave

Question 36

36. What causes phase difference in AC circuits?

Answer

Only capacitance

Answer

Inductance and capacitance

Answer

Voltage drop

Answer

Resistance only

Question 37

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

Answer

Gamma rays

Answer

Ultraviolet

Answer

Microwaves

Question 38

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

Question 39

39. Which EM wave is used in radar systems?

Answer

Microwaves

Answer

Radio waves

Question 40

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

Question 41

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

Question 42

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

Answer

Voltage leads current

Answer

Voltage lags current by 180°

Answer

Current leads voltage

Answer

Voltage and current are in phase

Question 43

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

Answer

Can be stepped up or down using transformers

Answer

Constant voltage

Answer

Can be converted to DC

Answer

Ability to reverse direction

Question 44

44. The EM wave with the shortest wavelength is:

Answer

Microwaves

Answer

Ultraviolet

Answer

Gamma rays

Question 45

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

Answer

Ultraviolet

Answer

Radio waves

Question 46

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

Answer

Lags current by 90°

Answer

Leads current by 180°

Answer

Leads current by 90°

Answer

Is in phase with current

Question 47

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

Answer

Acts as an insulator

Answer

Discharges quickly

Answer

Increases current

Answer

Acts as a conductor

Question 48

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

Answer

Visible light

Answer

Gamma rays

Answer

Radio waves

Question 49

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

Answer

Determines speed

Answer

Determines direction

Answer

Shows the strength of the current

Answer

Shows the time difference between voltage and current

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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