Q: 19 (CDS-II/2016)
question_subject:
Science
question_exam:
CDS-II
stats:
0,13,36,17,18,10,4
keywords:
{'mercury': [0, 0, 2, 2], 'pressure': [0, 0, 0, 1], 'atmosphere': [1, 1, 4, 7], 'mm column': [0, 0, 0, 1]}
Option 1: 1 pascal - This is incorrect. Pascal is a unit of pressure, but the pressure exerted by a column of mercury at 0 °C is much higher than 1 pascal.
Option 2: 1 atmosphere - This is the correct answer. The pressure exerted by a 760 mm column of mercury at 0 °C is equal to 1 atmosphere. An atmosphere is a unit of pressure commonly used to measure atmospheric pressure.
Option 3: 1 bar - This is incorrect. A bar is another unit of pressure, but it is not equivalent to 1 atmosphere. One atmosphere is approximately equal to 1.013 bar.
Option 4: 1 poise - This is incorrect. Poise is a unit of dynamic viscosity, not pressure.
In conclusion, the pressure exerted by a 760 mm column of mercury at 0 °C is known as 1 atmosphere.