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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 part of the electromagnetic spectrum does visible light lie?

Between ultraviolet and X-rays

Between infrared and ultraviolet

Between X-rays and gamma rays

Between microwaves and radio waves

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

Ultraviolet

Microwaves

Gamma rays

Infrared

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

To measure voltage

To calculate resistance

To understand power distribution

To measure current

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

Phase angle

Impedance

Reactance

Power factor

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

Is zero

Lags voltage

Leads voltage

Is in phase

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

It becomes negative

It becomes 1

It becomes zero

It remains unchanged

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

Resistor

Inductor

Transformer

Capacitor

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

Energy

Wavelength

Frequency

Speed

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

Resistor

Inductor

Capacitor

Transformer

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

Voltage leads current

Voltage and current are in phase

Current is zero

Current leads voltage

11. What causes phase difference in AC circuits?

Only capacitance

Resistance only

Inductance and capacitance

Voltage drop

12. Which electromagnetic wave has more penetrating power?

Infrared

Ultraviolet

Gamma rays

X-rays

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

Wattmeter

Ammeter

Voltmeter

Frequency meter

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

Visible light

Gamma rays

Radio waves

Infrared

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

Radio waves

Infrared

X-rays

Microwaves

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

Microwaves

Ultraviolet

Radio waves

Infrared

17. 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

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

Root mean square

Resistance maximum supply

Radio mean speed

Radiant mechanical signal

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

Frequency

Medium

Direction

Speed

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

Can be stepped up or down using transformers

Ability to reverse direction

Can be converted to DC

Constant voltage

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

Voltage and current are in phase

Both occur simultaneously

Voltage is ahead of current

Current is ahead of voltage

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

Henry

Volt

Ampere

Ohm

23. Which electromagnetic wave is used in satellite communication?

X-rays

Microwaves

Infrared rays

Gamma rays

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

Pure inductor

Pure resistor

Pure capacitor

RC circuit

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

Ultraviolet

Infrared

Radio waves

X-rays

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

0°

90°

180°

45°

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

Inductor

Transformer

Resistor

Capacitor

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

It acts like a resistor

It blocks current

It allows current with a phase lead

It charges fully

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

Gamma rays

Infrared

X-rays

Radio waves

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

Determines direction

Shows the time difference between voltage and current

Shows the strength of the current

Determines speed

31. Which EM wave is used in cancer treatment?

Microwaves

Infrared

Ultraviolet

Gamma rays

32. Which electromagnetic wave is responsible for sunburn?

Ultraviolet rays

Microwaves

X-rays

Gamma rays

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

Transformer

Resistor

Capacitor

Inductor

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

Voltage and current are in phase

Voltage leads current

Current leads voltage

Voltage lags current by 180°

35. When AC passes through a capacitor, it:

Is blocked completely

Passes with phase lag

Reverses direction

Passes with phase lead

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

Acts as an insulator

Increases current

Acts as a conductor

Discharges quickly

37. Which EM wave is used in radar systems?

X-rays

Infrared

Radio waves

Microwaves

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

Is in phase with current

Lags current by 90°

Leads current by 90°

Leads current by 180°

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

Radio waves

Microwaves

Ultraviolet rays

Infrared rays

40. 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°

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

25 Hz

60 Hz

100 Hz

50 Hz

42. Which EM wave is used in remote controls?

Gamma rays

Infrared rays

X-rays

Radio waves

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

Capacitor

Inductor

Resistor

Diode

44. What is the waveform of typical alternating current?

Square wave

Triangular wave

Sine wave

Constant wave

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

X-rays

Microwaves

Infrared

Sound waves

46. Which EM wave is used in mobile communication?

Gamma rays

Microwaves

X-rays

Infrared

47. The EM wave with the shortest wavelength is:

Gamma rays

Ultraviolet

X-rays

Microwaves

48. How does increasing the frequency affect capacitive reactance?

Increases it

Becomes zero

No effect

Decreases it

49. What determines the impedance of an RLC circuit?

Resistance and capacitance

Only inductance

Only resistance

Resistance, inductance, and capacitance

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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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