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 same pressure on the base of each vessel.

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

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

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

2. 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

3. 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?

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

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

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

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

4. 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

400 N

3000 N

300 N

5. Bubbles of gas, escaping from the mud at the bottom of a deep lake, rise to the surface.

As the bubbles rise, they get larger.

Why is this?

Water pressure on the bubbles increases.

Atmospheric pressure on the bubbles decreases.

Water pressure on the bubbles decreases.

Atmospheric pressure on the bubbles increases.

6. 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

C

D

A

7. 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?

0.4 p

0.6 p

2.5 p

1.5 p

8. 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

12 cm of water more than atmospheric pressure

8 cm of water more than atmospheric pressure

9. 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?

$\frac{\rho}{2}$

$\frac{\rho}{3}$

$3 \rho$

$2 \rho$

10. The diagram above shows a cylindrical container with diameter 0.5 m containing a liquid of density 750 $kg \, m^{-3}$. Find the pressure exerted by the liquid on the base of the container.

$7.5 \times 10^{2}$ Pa

$7.5 \times 10^{3}$ Pa

$1.5 \times 10^{3}$ Pa

$1.5 \times 10^{4}$ Pa

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