MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
1 Pa = how many atm?
Think it through first, then pick an option.
- a 76
- b 10⁵
- c 9.8723 × 10⁻³
- d 9.8723 × 10⁻⁶
Answer and explanation
Correct answer: d 9.8723 × 10⁻⁶
1 atm = 101325 Pa, so 1 Pa = 1/101325 atm, about 9.87 × 10⁻⁶ atm.
Why the other options are wrong
- a 76: The number 76 is the height of the mercury column in cm; it is not the ratio of Pa to atm.
- b 10⁵: 1 atm is about 10⁵ Pa, so the other way round 1 Pa is about 10⁻⁵ atm, not 10⁵ atm.
- c 9.8723 × 10⁻³: 1 Pa = 1 ÷ 101325 atm, about 10⁻⁵; a value of 10⁻³ would make 1 atm only about 10³ Pa.
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