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

Resistor

Inductor

Transformer

Capacitor

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

Energy

Wavelength

Frequency

Speed

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

Acts as a conductor

Increases current

Acts as an insulator

Discharges quickly

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

Leads current by 180°

Leads current by 90°

Lags current by 90°

Is in phase with current

5. Which EM wave is used in radar systems?

Microwaves

Infrared

X-rays

Radio waves

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

Voltage and current are in phase

Voltage lags current

Voltage leads current

Current leads voltage

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

Pure inductor

Pure resistor

Pure capacitor

RC circuit

8. Which electromagnetic wave is responsible for sunburn?

X-rays

Microwaves

Gamma rays

Ultraviolet rays

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

Ampere

Volt

Henry

Ohm

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

Ability to reverse direction

Can be stepped up or down using transformers

Can be converted to DC

Constant voltage

11. What causes phase difference in AC circuits?

Resistance only

Only capacitance

Voltage drop

Inductance and capacitance

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

Voltage leads current by 90°

Voltage leads current by 180°

No phase difference

Voltage lags current by 90°

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

Is in phase

Is zero

Leads voltage

Lags voltage

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

25 Hz

60 Hz

50 Hz

100 Hz

15. What is the waveform of typical alternating current?

Square wave

Sine wave

Constant wave

Triangular wave

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

0°

180°

90°

45°

17. 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

18. Which EM wave is used in remote controls?

X-rays

Radio waves

Infrared rays

Gamma rays

19. 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

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

Phase angle

Reactance

Impedance

Power factor

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

Radio mean speed

Root mean square

Resistance maximum supply

Radiant mechanical signal

22. The EM wave with the shortest wavelength is:

X-rays

Gamma rays

Ultraviolet

Microwaves

23. When AC passes through a capacitor, it:

Reverses direction

Passes with phase lag

Is blocked completely

Passes with phase lead

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

Infrared rays

Radio waves

Microwaves

Ultraviolet rays

25. Which EM wave is used in cancer treatment?

Microwaves

Infrared

Gamma rays

Ultraviolet

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

Transformer

Capacitor

Resistor

Inductor

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

Microwaves

X-rays

Infrared

Radio waves

28. Which electromagnetic wave is used in satellite communication?

X-rays

Infrared rays

Gamma rays

Microwaves

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

Capacitor

Transformer

Resistor

Inductor

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

To calculate resistance

To understand power distribution

To measure voltage

To measure current

31. Which EM wave is used in mobile communication?

Microwaves

X-rays

Infrared

Gamma rays

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

Between microwaves and radio waves

Between X-rays and gamma rays

Between infrared and ultraviolet

Between ultraviolet and X-rays

33. Which electromagnetic wave has more penetrating power?

Ultraviolet

X-rays

Gamma rays

Infrared

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

Gamma rays

Ultraviolet

Microwaves

Infrared

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

Radio waves

Ultraviolet

Microwaves

Infrared

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

Both occur simultaneously

Current is ahead of voltage

Voltage is ahead of current

Voltage and current are in phase

37. How does increasing the frequency affect capacitive reactance?

No effect

Decreases it

Becomes zero

Increases it

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

Shows the strength of the current

Shows the time difference between voltage and current

Determines direction

Determines speed

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

Current is zero

Voltage leads current

Voltage and current are in phase

Current leads voltage

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

Infrared

Microwaves

X-rays

Sound waves

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

Resistor

Capacitor

Inductor

Transformer

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

It remains unchanged

It becomes 1

It becomes zero

It becomes negative

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

Frequency

Direction

Speed

Medium

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

Gamma rays

Radio waves

Visible light

Infrared

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

Resistor

Capacitor

Inductor

Diode

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

X-rays

Radio waves

Infrared

Ultraviolet

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

Voltmeter

Ammeter

Wattmeter

Frequency meter

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

Infrared

Radio waves

Gamma rays

X-rays

49. What determines the impedance of an RLC circuit?

Only resistance

Resistance and capacitance

Resistance, inductance, and capacitance

Only inductance

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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

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