MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
The atmospheric pressure at a place is 93296 Pa. The density of kerosene is 800 kgm⁻³ and of benzene 980 kgm⁻³. Which of the following is correct?
Think it through first, then pick an option.
- a The height of the mercury column is 76 cm
- b The height of the water column is 9.52 m
- c The height of the kerosene column is 9.71 m
- d The height of the benzene column is 11.9 m
Answer and explanation
Correct answer: b The height of the water column is 9.52 m
The water column is 93296 ÷ (1000 × 9.8) = 9.52 m.
Why the other options are wrong
- a The height of the mercury column is 76 cm: The mercury column is 93296 ÷ (13600 × 9.8) = 0.7 m = 70 cm; 76 cm would need 101325 Pa.
- c The height of the kerosene column is 9.71 m: The kerosene column is 93296 ÷ (800 × 9.8) = 11.9 m, not 9.71 m.
- d The height of the benzene column is 11.9 m: The benzene column is 93296 ÷ (980 × 9.8) = 9.71 m, not 11.9 m.
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