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 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

0.6 p

0.4 p

2.5 p

2. 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?

B

D

C

A

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

strength of the gravitational field

density of the liquid

depth of the liquid

area of the liquid surface

4. 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 decreases, because atmospheric pressure decreases with height.

It increases, because atmospheric pressure decreases with height.

It increases, because atmospheric pressure increases with height.

It decreases, because atmospheric pressure increases with height.

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

Gravity has decreased.

Air pressure has increased.

There is less air above the barometer.

Temperature has increased.

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

an empty lorry with four wheels

a loaded lorry with six wheels

an empty lorry with six wheels

a loaded lorry with four wheels

7. 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 into a deep underground mine.

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.

8. A small table weighing 40 N stands on four legs, each having an area of $0.001 \text{ m}^{2}$. What is the pressure of the table on the floor?

$40 \, 000 \text{N m}^{-2}$

$400 \text{N m}^{-2}$

$10 \, 000 \text{N m}^{-2}$

$1000 \text{N m}^{-2}$

9. 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 less than atmospheric pressure

8 cm of water more than atmospheric pressure

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?

9 cm of liquid above atmospheric pressure

18 cm of liquid below atmospheric pressure

18 cm of liquid above atmospheric pressure

9 cm of liquid below atmospheric pressure

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