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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

Transformer

Inductor

Capacitor

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

Transformer

Inductor

Resistor

Capacitor

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

Capacitor

Transformer

Inductor

Resistor

4. How does increasing the frequency affect capacitive reactance?

Becomes zero

Decreases it

No effect

Increases it

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

X-rays

Ultraviolet

Radio waves

Infrared

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

Infrared

Radio waves

Gamma rays

Visible light

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

Between microwaves and radio waves

Between X-rays and gamma rays

Between ultraviolet and X-rays

Between infrared and ultraviolet

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

Voltage lags current

Current leads voltage

Voltage and current are in phase

Voltage leads current

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

Voltage leads current by 180°

Voltage leads current by 90°

No phase difference

Voltage lags current by 90°

10. Which EM wave is used in mobile communication?

Gamma rays

Microwaves

Infrared

X-rays

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

Pure capacitor

Pure inductor

RC circuit

Pure resistor

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

Speed

Frequency

Wavelength

Energy

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

X-rays

Infrared

Microwaves

Sound waves

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

Speed

Medium

Direction

Frequency

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

Ultraviolet

Microwaves

Infrared

Radio waves

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

Radiant mechanical signal

Root mean square

Resistance maximum supply

Radio mean speed

17. Which electromagnetic wave is used in satellite communication?

X-rays

Infrared rays

Microwaves

Gamma rays

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

Is zero

Is in phase

Lags voltage

Leads voltage

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

Voltage is ahead of current

Both occur simultaneously

Current is ahead of voltage

Voltage and current are in phase

20. What is the waveform of typical alternating current?

Sine wave

Triangular wave

Constant wave

Square wave

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

X-rays

Infrared

Radio waves

Gamma rays

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

Voltmeter

Ammeter

Wattmeter

Frequency meter

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

To measure current

To understand power distribution

To calculate resistance

To measure voltage

24. Which electromagnetic wave is responsible for sunburn?

X-rays

Microwaves

Gamma rays

Ultraviolet rays

25. 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 speed

Determines direction

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26. When AC passes through a capacitor, it:

Passes with phase lag

Reverses direction

Is blocked completely

Passes with phase lead

27. Which EM wave is used in cancer treatment?

Gamma rays

Ultraviolet

Microwaves

Infrared

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

Acts as an insulator

Increases current

Discharges quickly

Acts as a conductor

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

Infrared

Radio waves

X-rays

Microwaves

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

Resistor

Inductor

Capacitor

Transformer

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

Ampere

Henry

Ohm

Volt

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

45°

180°

0°

90°

33. Which EM wave is used in remote controls?

Gamma rays

X-rays

Infrared rays

Radio waves

34. What determines the impedance of an RLC circuit?

Only resistance

Resistance, inductance, and capacitance

Only inductance

Resistance and capacitance

35. The EM wave with the shortest wavelength is:

Ultraviolet

X-rays

Gamma rays

Microwaves

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

Constant voltage

Can be converted to DC

Ability to reverse direction

Can be stepped up or down using transformers

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

It remains unchanged

It becomes zero

It becomes 1

It becomes negative

38. 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°

39. What causes phase difference in AC circuits?

Only capacitance

Resistance only

Inductance and capacitance

Voltage drop

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

Impedance

Phase angle

Reactance

Power factor

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

It allows current with a phase lead

It blocks current

It acts like a resistor

It charges fully

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

Infrared

Microwaves

Gamma rays

Ultraviolet

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

Current leads voltage

Voltage leads current

Current is zero

Voltage and current are in phase

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

25 Hz

100 Hz

50 Hz

60 Hz

45. Which EM wave is used in radar systems?

X-rays

Infrared

Microwaves

Radio waves

46. Which electromagnetic wave has more penetrating power?

X-rays

Infrared

Gamma rays

Ultraviolet

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

Diode

Resistor

Inductor

Capacitor

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

Infrared rays

Radio waves

Microwaves

Ultraviolet rays

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

Current leads voltage

Voltage leads current

Voltage lags current by 180°

Voltage and current are in phase

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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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