Physical Sciences MCQs (Set 1)

26. Which one of the following is not a radioactive element?

  • A. Uranium
  • B. Radium
  • C. Thorium
  • D. Cadmium
View Answer
Correct Answer:
D. Cadmium

Explanation:
……

27. Which of the following is a physical change?

  • A. Boiling of Water
  • B. Rusting of Iron
  • C. Burning of Candle
  • D. Boiling of an Egg
View Answer
Correct Answer:
A. Boiling of Water

Explanation:
……

28. Which gas is commonly used in balloons and airships?

  • A. Hydrogen
  • B. Helium
  • C. Carbon
  • D. Nitrogen
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Correct Answer:
B. Helium

Explanation:
……

29. Metals are good conductors of heat because ____________.

  • A. They have free electrons
  • B. Their atoms are far apart
  • C. Their atoms collide frequently
  • D. They have reflecting surface
View Answer
Correct Answer:
A. They have free electrons

Explanation:
……

30. When oil is spread on water surface, the surface tension _______.

  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Depends upon the nature of oil
View Answer
Correct Answer:
B. Decreases

Explanation:
……

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