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. 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 P.

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

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

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

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

area of the liquid surface

strength of the gravitational field

depth of the liquid

density of the liquid

3. 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?

C

A

D

B

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 into a deep underground mine.

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

Bring A up a mountain.

5. 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 $cm^{2}$.

$5.5 \times 10^{4}$

$3.0 \times 10^{3}$

$2.5 \times 10^{4}$

$5.0 \times 10^{3}$

6. Air is trapped in a cylinder by a piston. The pressure of the air is $\rho$ and the length of the air column is 20 cm.

The piston is moved outwards until the length of the air column has increased by 40 cm.

The temperature of the air remains constant.

What is the new air pressure?

$3 \rho$

$\frac{\rho}{2}$

$2 \rho$

$\frac{\rho}{3}$

7. 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 more than atmospheric pressure

8 cm of water less than atmospheric pressure

12 cm of water less than atmospheric pressure

8 cm of water more than atmospheric pressure

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 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?

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

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

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

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

10. 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?

$\frac{P}{X}$

$\frac{Q}{X}$

$\frac{P}{Y}$

$\frac{Q}{Y}$

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