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. 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?

$3 \rho$

$\frac{\rho}{3}$

$\frac{\rho}{2}$

$2 \rho$

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

What is the pressure it exerts on the ground?

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

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

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

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

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?

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

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

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

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

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 up a mountain.

Bring A into a deep underground mine.

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

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 $cm^{2}$.

$2.5 \times 10^{4}$

$5.0 \times 10^{3}$

$5.5 \times 10^{4}$

$3.0 \times 10^{3}$

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?

A

D

B

C

7. 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

Vibrates

Explodes

Contracts

8. 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 decreases with height.

It decreases, because atmospheric pressure increases with height.

It increases, because atmospheric pressure increases with height.

It decreases, because atmospheric pressure decreases with height.

9. 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.

$7.5 \times 10^{3}$ Pa

$7.5 \times 10^{2}$ Pa

$1.5 \times 10^{4}$ Pa

$1.5 \times 10^{3}$ Pa

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

strength of the gravitational field

area of the liquid surface

depth of the liquid

density of the liquid

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