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. 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

C

A

B

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

What is the pressure it exerts on the ground?

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

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

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

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

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 increases, because atmospheric pressure decreases with height.

It decreases, because atmospheric pressure decreases with height.

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

D

B

C

A

5. 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.

2000 Pa

400 Pa

4000 Pa

200 Pa

6. 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?

Bring A up a mountain.

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

Bring A into a deep underground mine.

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

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

a loaded lorry with four wheels

an empty lorry with four wheels

a loaded lorry with six wheels

an empty lorry with six wheels

8. If the pressure exerted on a floor by a box is 200 kPa, find the weight of the box, given that the bottom of the box has a contact area of 20 $cm^{2}$.

600 N

3000 N

300 N

400 N

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?

60 kPa

960 kPa

480 kPa

240 kPa

10. Four different liquids are poured into identical measuring cylinders. The diagrams show the depths of the liquids and their densities.

Which liquid causes the largest pressure on the base of its measuring cylinder?

A

C

D

B

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