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MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure

Cumilla Board 2022

As one goes higher above the sea level of the earth's surface-

  1. i. the weight of the atmosphere increases
  2. ii. the density of air decreases
  3. iii. the air pressure decreases

Think it through first, then pick an option.

  1. a i and ii
  2. b i and iii
  3. c ii and iii
  4. d i, ii and iii
Answer and explanation

Correct answer: c ii and iii

Statement i is not true: going up shortens the air column above, so its weight falls, not rises.; ii is true: the air is less compressed higher up, so the density falls.; iii is true: the weight of the air column falls, so the air pressure falls.

Why the other options are wrong

  • a i and ii: Statement i is not true: going up shortens the air column above, so its weight falls, not rises.
  • b i and iii: Statement i is not true: going up shortens the air column above, so its weight falls, not rises.
  • d i, ii and iii: Statement i is not true: going up shortens the air column above, so its weight falls, not rises.