MCQ practice · SSC Physics Board questions · Chapter 5: State of Matter and Pressure
Normal air pressure can hold up a mercury column of what height?
Think it through first, then pick an option.
- a 7.6mm
- b 76mm
- c 7.6cm
- d 76cm
Answer and explanation
Correct answer: d 76cm
Normal atmospheric pressure (1 atm) equals the pressure of a 76 cm mercury column.
Why the other options are wrong
- a 7.6mm: A column of 7.6 mm is far too short; the mercury column is 76 cm, that is 760 mm.
- b 76mm: 76 mm = 7.6 cm, which is a tenth of the book's 76 cm.
- c 7.6cm: 7.6 cm is a tenth of the book's 76 cm.
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