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. An air bubble is inside a air-tight cylinder fitted with a piston. What happens to the air bubble when the piston is pushed in? Note that the air bubble is surrounded by air in the cylinder. Assume that the there is still enough space for the air bubble to "survive" after the piston is pushed in.

Expands

Explodes

Contracts

Vibrates

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?

$\frac{Q}{X}$

$\frac{Q}{Y}$

$\frac{P}{X}$

$\frac{P}{Y}$

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

What is the pressure it exerts on the ground?

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

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

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

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

4. 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?

Atmospheric pressure on the bubbles increases.

Atmospheric pressure on the bubbles decreases.

Water pressure on the bubbles increases.

Water pressure on the bubbles decreases.

5. 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.

6. Which graph shows the relationship between the pressure and volume of a fixed mass of gas at constant temperature?

B

A

D

C

7. 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

300 N

400 N

3000 N

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 more than atmospheric pressure

12 cm of water more than atmospheric pressure

8 cm of water less than atmospheric pressure

12 cm of water less than atmospheric pressure

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?

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

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

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

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

10. 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?

$\frac{\rho}{3}$

$2 \rho$

$3 \rho$

$\frac{\rho}{2}$

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