MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
Which is the amount of pressure at a depth of 210 m in the sea? The density of sea water is ρ = 1025 kg m⁻³.
Think it through first, then pick an option.
- a 2.1 atm
- b 4.2 atm
- c 20.83 atm
- d 42 atm
Answer and explanation
Correct answer: c 20.83 atm
P = hρg = 210 × 1025 × 9.8 ≈ 2.1 × 10⁶ Pa; dividing by 101325 Pa gives about 20.8 atm, the nearest option.
Why the other options are wrong
- a 2.1 atm: A value of 2.1 atm belongs to about 21 m; at 210 m the pressure is about 21 atm.
- b 4.2 atm: A value of 4.2 atm belongs to about 42 m; at 210 m the pressure is about 21 atm.
- d 42 atm: A value of 42 atm belongs to about 420 m; the pressure at 210 m is half of that.
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