Physics
The thrust exerted per unit area on the earth's surface due to a column of air is called :
- pressure
- atmospheric pressure
- density
- buoyancy
Fluids Pressure
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Answer
atmospheric pressure
Reason — The thrust exerted per unit area on the earth's surface due to column of air, is called atmospheric pressure on the surface of earth.
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Related Questions
Two cylindrical vessels fitted with pistons A and B of area of cross section 8 cm 2 and 320 cm 2 respectively, are joined at their bottom by a tube and they are completely filled with water. When a mass of 4 kg is placed on piston A, find : (i) the pressure on piston A, (ii) the pressure on piston B, and (iii) the thrust on piston B.
What force is applied on a piston of area of cross section 2 cm 2 to obtain a force 150 N on the piston of area of cross section 12 cm 2 in a hydraulic machine ?
The normal atmospheric pressure is :
- 76 m of Hg
- 76 cm of Hg
- 76 Pa
- 76 N m-2
The unit torr is related to the barometric height as:
- 1 torr = 1 cm of Hg
- 1 torr = 0.76 cm of Hg
- 1 torr = 1 mm of Hg
- 1 torr = 1 m of Hg