Physical Sciences MCQs (Set 1)

21. Which of the following is used in semi- conductors?

  • A. Aluminum
  • B. Copper
  • C. Silicon
  • D. None of these
View Answer
Correct Answer:
C. Silicon

Explanation:
……

22. Moisture can be removed from lubricating oil using _________.

  • A. Tubular centrifugal
  • B. Clarifier
  • C. Sparkler filter
  • D. Vacuum leaf filter
View Answer
Correct Answer:
A. Tubular centrifugal

Explanation:
……

23. A transformer mainly transforms ___________.

  • A. Current
  • B. Voltage
  • C. Frequency
  • D. Power
View Answer
Correct Answer:
B. Voltage

Explanation:
……

24. Which of the following light wave is outside the visible spectrum?

  • A. Violet
  • B. Blue
  • C. Yellow
  • D. Ultraviolet
View Answer
Correct Answer:
D. Ultraviolet

Explanation:
……

25. A periscope works by the principle of ____________.

  • A. Refraction
  • B. Total internal reflection
  • C. Diffraction
  • D. Reflection and refraction
View Answer
Correct Answer:
B. Total internal reflection

Explanation:
……

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