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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 X-rays and gamma rays

Between infrared and ultraviolet

Between ultraviolet and X-rays

Between microwaves and radio waves

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

50 Hz

100 Hz

60 Hz

25 Hz

3. Which electromagnetic wave is responsible for sunburn?

X-rays

Microwaves

Ultraviolet rays

Gamma rays

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

Resistor

Inductor

Transformer

Capacitor

5. Which electromagnetic wave is used in satellite communication?

Gamma rays

Infrared rays

Microwaves

X-rays

6. How does increasing the frequency affect capacitive reactance?

Increases it

No effect

Becomes zero

Decreases it

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

Infrared

Radio waves

Ultraviolet

X-rays

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

Voltage leads current

Voltage lags current by 180°

Current leads voltage

Voltage and current are in phase

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

Direction

Speed

Medium

Frequency

10. Which EM wave is used in cancer treatment?

Infrared

Gamma rays

Microwaves

Ultraviolet

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

X-rays

Infrared

Microwaves

Sound waves

12. The EM wave with the shortest wavelength is:

Microwaves

Gamma rays

X-rays

Ultraviolet

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

180°

90°

45°

0°

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

Radio waves

Microwaves

Ultraviolet

Infrared

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

Voltmeter

Wattmeter

Ammeter

Frequency meter

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

Leads current by 90°

Leads current by 180°

Is in phase with current

Lags current by 90°

17. What is the waveform of typical alternating current?

Square wave

Constant wave

Sine wave

Triangular wave

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

Wavelength

Frequency

Energy

Speed

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

RC circuit

Pure capacitor

Pure resistor

Pure inductor

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

Voltage leads current by 90°

No phase difference

Voltage leads current by 180°

Voltage lags current by 90°

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

Infrared

Gamma rays

Visible light

Radio waves

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

Is in phase

Lags voltage

Leads voltage

Is zero

23. What causes phase difference in AC circuits?

Only capacitance

Voltage drop

Inductance and capacitance

Resistance only

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

Inductor

Capacitor

Resistor

Transformer

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

Voltage is ahead of current

Current is ahead of voltage

Voltage and current are in phase

Both occur simultaneously

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

Radio waves

Gamma rays

Infrared

X-rays

27. Which electromagnetic wave has more penetrating power?

Ultraviolet

Gamma rays

Infrared

X-rays

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

It acts like a resistor

It charges fully

It blocks current

It allows current with a phase lead

29. What determines the impedance of an RLC circuit?

Resistance, inductance, and capacitance

Resistance and capacitance

Only resistance

Only inductance

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

Capacitor

Transformer

Resistor

Inductor

31. Which EM wave is used in mobile communication?

Infrared

Microwaves

X-rays

Gamma rays

32. Which EM wave is used in remote controls?

X-rays

Gamma rays

Infrared rays

Radio waves

33. Which EM wave is used in radar systems?

X-rays

Radio waves

Microwaves

Infrared

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

Capacitor

Inductor

Resistor

Transformer

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

Diode

Resistor

Inductor

Capacitor

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

To understand power distribution

To measure voltage

To calculate resistance

To measure current

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

Volt

Ampere

Henry

Ohm

38. When AC passes through a capacitor, it:

Passes with phase lag

Reverses direction

Is blocked completely

Passes with phase lead

39. 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

Constant voltage

Can be converted to DC

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

Reactance

Phase angle

Impedance

Power factor

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

Acts as a conductor

Increases current

Discharges quickly

Acts as an insulator

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

Current leads voltage

Voltage and current are in phase

Current is zero

Voltage leads current

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

Infrared

X-rays

Radio waves

Microwaves

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

Current leads voltage

Voltage lags current

Voltage and current are in phase

Voltage leads current

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

Radiant mechanical signal

Resistance maximum supply

Radio mean speed

Root mean square

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

Determines direction

Determines speed

Shows the strength of the current

Shows the time difference between voltage and current

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

Microwaves

Ultraviolet

Gamma rays

Infrared

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

Infrared rays

Microwaves

Radio waves

Ultraviolet rays

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

It remains unchanged

It becomes negative

It becomes 1

It becomes zero

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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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