Practice MCQs For Pressure

This quiz contains practice questions for GCE ‘O’ level topic: Pressure. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

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1. Bubbles of gas, escaping from the mud at the bottom of a deep lake, rise to the surface.

As the bubbles rise, they get larger.

Why is this?

Water pressure on the bubbles decreases.

Atmospheric pressure on the bubbles increases.

Water pressure on the bubbles increases.

Atmospheric pressure on the bubbles decreases.

2. The diagrams show, to the same scale, the vertical sections of a set of circular vessels, each containing the same depth of water.

Which one of the following statements is correct?

The water exerts the greatest pressure on the base of vessel S.

The water exerts the greatest pressure on the base of vessel P.

The water exerts the same force on the base of each vessel.

The water exerts the same pressure on the base of each vessel.

3. Which would be the least likely to sink into soft ground?

an empty lorry with six wheels

an empty lorry with four wheels

a loaded lorry with six wheels

a loaded lorry with four wheels

4. Which of the following will cause the height of the mercury column in a barometer, A, to be higher than  that of another barometer, B, located at sea level?

Introduce some air into barometer A, in the space above the mercury column.

Bring A to the moon and place it out in the open.

Bring A up a mountain.

Bring A into a deep underground mine.

5. A gas is trapped inside a cylinder by a movable piston. The length of the gas column is 50 cm and the pressure inside the cylinder is p.

The piston is pushed in a distance of 30 cm, so that the length of the gas column is now 20 cm. The temperature of the gas does not change.

What is the new pressure of the gas?

0.6 p

2.5 p

1.5 p

0.4 p

6. The diagram shows a manometer containing mercury that is sealed at one end.

What happens to the distance h when the manometer is taken to the top of a mountain?

It increases, because atmospheric pressure decreases with height.

It decreases, because atmospheric pressure increases with height.

It increases, because atmospheric pressure increases with height.

It decreases, because atmospheric pressure decreases with height.

7. Objects of different weights are placed on a rigid, horizontal surface.

Which row shows the correct pressure acting on the surface?

	Weight (N)	Area in contact ($m^{2}$)	Pressure (Pa)
A	10	0.1	1
B	20	0.2	0.01
C	30	0.1	300
D	40	0.2	8

B

C

A

D

8. An air bubble is inside a air-tight cylinder fitted with a piston. What happens to the air bubble when the piston is pushed in? Note that the air bubble is surrounded by air in the cylinder. Assume that the there is still enough space for the air bubble to "survive" after the piston is pushed in.

Expands

Contracts

Vibrates

Explodes

9. A gas occupies a volume of $2.0 \text{ m}^{3}$ in a cylinder at a pressure of 240 kPa. A piston compresses the gas until the volume is $0.50 \text{ m}^{3}$, the temperature remaining constant.

What is the new pressure of the gas?

960 kPa

240 kPa

60 kPa

480 kPa

10. The diagram shows the levels X and Y in a liquid manometer when the gas tap is opened.

What is the pressure of the gas in the cylinder?

18 cm of liquid above atmospheric pressure

9 cm of liquid below atmospheric pressure

18 cm of liquid below atmospheric pressure

9 cm of liquid above atmospheric pressure

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