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. A manometer is connected to a gas supply.

Pressure can be measured in cm of water.

What is the pressure of the gas?

12 cm of water less than atmospheric pressure

12 cm of water more than atmospheric pressure

8 cm of water more than atmospheric pressure

8 cm of water less than atmospheric pressure

2. The diagram shows a glass block resting on a table top.

The area of the block in contact with the table is X and the area of the table top is Y.

The weight of the block is P and the weight of the table is Q.

Which expression gives the pressure exerted on the table by the block?

$\frac{P}{Y}$

$\frac{P}{X}$

$\frac{Q}{Y}$

$\frac{Q}{X}$

3. 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 increases with height.

It decreases, because atmospheric pressure increases with height.

It decreases, because atmospheric pressure decreases with height.

It increases, because atmospheric pressure decreases with height.

4. A brick of weight 80 N stands upright on the ground as shown.

What is the pressure it exerts on the ground?

$\frac{80}{20 \times 10} \, \text{N cm}^{-2}$

$\frac{10 \times 5}{80} \, \text{N cm}^{-2}$

$\frac{80}{10 \times 5} \, \text{N cm}^{-2}$

$\frac{20 \times 10}{80} \, \text{N cm}^{-2}$

5. 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?

9 cm of liquid below atmospheric pressure

9 cm of liquid above atmospheric pressure

18 cm of liquid above atmospheric pressure

18 cm of liquid below atmospheric pressure

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

C

A

D

B

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

Gravity has decreased.

There is less air above the barometer.

Temperature has increased.

Air pressure has increased.

8. 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.

400 Pa

4000 Pa

200 Pa

2000 Pa

9. 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

10. 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 $cm^{2}$.

$3.0 \times 10^{3}$

$2.5 \times 10^{4}$

$5.5 \times 10^{4}$

$5.0 \times 10^{3}$

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