Pressure
Physics · 50 practice questions
Atmospheric pressure (definition, S.I. units (Pa), measurement, mercury and aneroid barometers, manometer, variation with height, barometer as an altimeter); pressure in liquids (relationship between pressure, depth and density, transmission of pressure — Pascal's principle, applications).
- Recognize S.I. units of pressure and identify pressure-measuring instruments.
- Relate the variation of pressure to height and use a barometer as an altimeter.
- Determine the relationship between pressure, depth and density, and apply the principle of transmission of pressure in liquids to solve problems.
Try a few questions
- Practice question 1
Pressure is defined as the
- A.total force acting on an object, regardless of area
- B.mass of an object per unit volume
- C.weight of an object per unit length
- D.force acting perpendicularly per unit area
Show the answer
D. force acting perpendicularly per unit area
Pressure = force ÷ area, specifically for a force acting perpendicular to the surface.
- Practice question 2
A drinking straw works by a person
- A.increasing the air pressure inside the straw, forcing the liquid out
- B.reducing the air pressure inside the straw, letting atmospheric pressure push the liquid up
- C.directly pulling the liquid upward using their mouth muscles alone
- D.creating a vacuum inside the liquid itself
Show the answer
B. reducing the air pressure inside the straw, letting atmospheric pressure push the liquid up
Lowering the internal pressure allows the greater external atmospheric pressure to push liquid up the straw.
- Practice question 3
The pressure of a fluid at rest acts
- A.only in the vertically downward direction at any point
- B.only in the vertically upward direction at any point
- C.only in a single, fixed horizontal direction at any point
- D.equally in all directions at any given point within that fluid
Show the answer
D. equally in all directions at any given point within that fluid
A fundamental property of fluid pressure at rest is that it acts uniformly in every direction at a given point.
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