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MDCAT Physics Alternating Current Test Online

Mustansar KhanLast Updated: June 16, 2025

Physics Alternating Current MCQS Online Test

MDCAT Physics Alternating Current Chapter Online Test

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	MDCAT Entry Test Physics Online Test Interview Questions about Physics All Universities Entrance Test Recruitments Tests

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

Voltage is ahead of current

Current is ahead of voltage

Both occur simultaneously

Voltage and current are in phase

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

Transformer

Resistor

Inductor

Capacitor

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

Root mean square

Radiant mechanical signal

Resistance maximum supply

Radio mean speed

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

Transformer

Capacitor

Inductor

Resistor

5. What is the waveform of typical alternating current?

Triangular wave

Constant wave

Square wave

Sine wave

6. Which EM wave is used in cancer treatment?

Ultraviolet

Microwaves

Gamma rays

Infrared

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

It becomes zero

It becomes negative

It becomes 1

It remains unchanged

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

Shows the time difference between voltage and current

Determines speed

Shows the strength of the current

Determines direction

9. What determines the impedance of an RLC circuit?

Only inductance

Resistance and capacitance

Only resistance

Resistance, inductance, and capacitance

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

Infrared

Gamma rays

Microwaves

Ultraviolet

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

Voltage leads current by 180°

No phase difference

Voltage leads current by 90°

Voltage lags current by 90°

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

Reactance

Power factor

Impedance

Phase angle

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

To measure voltage

To calculate resistance

To understand power distribution

To measure current

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

Volt

Ohm

Henry

Ampere

15. Which EM wave is used in radar systems?

Infrared

Microwaves

Radio waves

X-rays

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

Inductor

Diode

Resistor

Capacitor

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

0°

90°

45°

180°

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

50 Hz

25 Hz

60 Hz

100 Hz

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

Between ultraviolet and X-rays

Between infrared and ultraviolet

Between microwaves and radio waves

Between X-rays and gamma rays

20. What causes phase difference in AC circuits?

Resistance only

Voltage drop

Only capacitance

Inductance and capacitance

21. How does increasing the frequency affect capacitive reactance?

Decreases it

Becomes zero

Increases it

No effect

22. When AC passes through a capacitor, it:

Reverses direction

Passes with phase lag

Passes with phase lead

Is blocked completely

23. Which electromagnetic wave is responsible for sunburn?

Microwaves

Ultraviolet rays

X-rays

Gamma rays

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

Visible light

Infrared

Radio waves

Gamma rays

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

Voltage and current are in phase

Voltage leads current

Current is zero

Current leads voltage

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

Capacitor

Transformer

Inductor

Resistor

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

Infrared

X-rays

Gamma rays

Radio waves

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

Infrared

Radio waves

Ultraviolet

X-rays

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

Ability to reverse direction

Constant voltage

Can be converted to DC

Can be stepped up or down using transformers

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

RC circuit

Pure capacitor

Pure resistor

Pure inductor

31. The EM wave with the shortest wavelength is:

Ultraviolet

Microwaves

Gamma rays

X-rays

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

Ultraviolet rays

Microwaves

Radio waves

Infrared rays

33. Which EM wave is used in mobile communication?

Microwaves

Infrared

Gamma rays

X-rays

34. Which electromagnetic wave has more penetrating power?

Gamma rays

X-rays

Infrared

Ultraviolet

35. Which EM wave is used in remote controls?

Infrared rays

Gamma rays

Radio waves

X-rays

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

Microwaves

Infrared

Radio waves

Ultraviolet

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

Radio waves

Infrared

Microwaves

X-rays

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

It allows current with a phase lead

It charges fully

It blocks current

It acts like a resistor

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

Ammeter

Wattmeter

Voltmeter

Frequency meter

40. Which electromagnetic wave is used in satellite communication?

Infrared rays

X-rays

Gamma rays

Microwaves

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

Speed

Frequency

Direction

Medium

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

Acts as an insulator

Discharges quickly

Increases current

Acts as a conductor

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

Leads current by 90°

Is in phase with current

Leads current by 180°

Lags current by 90°

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

Is zero

Is in phase

Lags voltage

Leads voltage

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

Infrared

X-rays

Microwaves

Sound waves

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

Transformer

Capacitor

Inductor

Resistor

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

Voltage leads current

Voltage and current are in phase

Current leads voltage

Voltage lags current

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

Speed

Wavelength

Frequency

Energy

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

Voltage lags current by 180°

Voltage and current are in phase

Voltage leads current

Current leads voltage

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Mustansar KhanLast Updated: June 16, 2025

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MDCAT Physics Alternating Current Test Online

Physics Alternating Current MCQS Online Test

MDCAT Physics Alternating Current Chapter Online Test

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Physics Alternating Current MCQS Online Test

MDCAT Physics Alternating Current Chapter Online Test

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