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. Find the pressure exerted on a person by a few plastic blocks of total mass 42 kg, the bottom of which in contact with the person has an area of 840 $cm^{2}$.

$5.5 \times 10^{4}$

$3.0 \times 10^{3}$

$2.5 \times 10^{4}$

$5.0 \times 10^{3}$

2. The diagram shows a simple mercury barometer. Which height is a measure of the atmospheric pressure?

A

B

C

D

3. A block of wood measuring 5 m long, 4 m wide and 0.5 m thick is placed on a table. Find the pressure exerted on the table due to the block if the mass of the block is 4000 kg.

4000 Pa

200 Pa

2000 Pa

400 Pa

4. A barometer is carried up on a balloon. Why does the reading on the barometer fall?

Temperature has increased.

Gravity has decreased.

Air pressure has increased.

There is less air above the barometer.

5. 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

D

B

A

C

6. 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?

1.5 p

0.4 p

2.5 p

0.6 p

7. Which of the following does not affect the pressure beneath the surface of a liquid?

depth of the liquid

density of the liquid

strength of the gravitational field

area of the liquid surface

8. 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

9 cm of liquid above atmospheric pressure

18 cm of liquid below atmospheric pressure

9. A manometer is connected to a gas supply.

Pressure can be measured in cm of water.

What is the pressure of the gas?

8 cm of water less than atmospheric pressure

12 cm of water less than atmospheric pressure

8 cm of water more than atmospheric pressure

12 cm of water more than atmospheric pressure

10. 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.

Contracts

Vibrates

Expands

Explodes

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