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Science Quiz - Pressure 03 (Questions)

Pressure changes with height and depth. It helps explain weather, why planes need cabins, and why mountaineers use oxygen tanks at high altitudes.

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Fascinating Fact:

Air pressure is lower at the top of a mountain, which is why climbers can find it harder to breathe.

In KS3 Science, students study how air and water pressure change with altitude and depth. This knowledge explains weather systems, flight, scuba diving, and mountain climbing challenges.

Key Terms

Altitude: Height above sea level, often affecting air pressure and breathing conditions.
Air Pressure: The force of air molecules pressing on surfaces, which decreases with height.
Oxygen Tank: A container of compressed oxygen used by climbers or divers where air pressure is low.

Frequently Asked Questions (Click to see answers)

Why is it harder to breathe at the top of a mountain?

It is harder to breathe because air pressure is lower, meaning there are fewer oxygen molecules in each breath compared to at sea level.

How does air pressure change with altitude?

Air pressure decreases as altitude increases. The higher you go, the thinner the air becomes, which affects breathing and weather patterns.

Why do airplanes need pressurised cabins?

Airplanes need pressurised cabins to maintain a safe air pressure for passengers, as the air outside at high altitudes is too thin to breathe comfortably.

Try These Related Quizzes

1.

What force is needed on an area of 4 m² to produce a pressure of 16 Pa?

[ ]	0.25 N
[ ]	4 N
[ ]	64 N
[ ]	64 Kg

2.

What force is needed on an area of 5 m² to produce a pressure of 25 Pa?

[ ]	5 N
[ ]	20 N
[ ]	30 N
[ ]	125 N

3.

The bottom of a box has an area of 5 m². What is the weight of the box to produce a pressure of 20 Pa?

[ ]	4 N
[ ]	100 N
[ ]	4 kg
[ ]	100 kg

4.

The bottom of a box has dimensions 2 m by 3 m. What is the weight of the box to produce a pressure of 20 Pa?

[ ]	4 N
[ ]	26 N
[ ]	100 N
[ ]	120 N

5.

A four legged table exerts a pressure of 8,000 Pa on the ground. Each leg has an area of 0.01 m². What is the weight of the table?

[ ]	32 N
[ ]	80 N
[ ]	320 N
[ ]	320 kg

6.

The dimensions of a ski are 8 cm x 150 cm. What is the weight of a skier standing on 2 skis to produce a pressure of 2,500 Pa?

[ ]	500 N
[ ]	600 N
[ ]	900 N
[ ]	2,400 N

7.

What has to happen to the force exerted over a fixed area if the pressure doubles?

[ ]	The force must decrease
[ ]	The force must double
[ ]	The force must increase
[ ]	The force must stay the same

8.

What has to happen to the force exerted if the area doubles but the pressure is unchanged?

[ ]	The force must decrease
[ ]	The force must double
[ ]	The force must increase
[ ]	The force must stay the same

9.

Box A has a weight of 20 N. It is put on top of box B. These two boxes exert a pressure of 60 Pa. The area box B covers is 3 m². Find weight of box B.

[ ]	60 N
[ ]	80 N
[ ]	160 N
[ ]	180 N

10.

A person at a fancy dress party is wearing a trainer on one foot and a shoe with a stiletto heel on the other! Which exerts the most pressure on the ground?

[ ]	Both the same
[ ]	Stiletto heel
[ ]	They don't exert a pressure
[ ]	Trainer

You can find more about this topic by visiting BBC Bitesize - Forces, Pressure and Speed

Science Quiz - Pressure 03 (Answers)

1.

What force is needed on an area of 4 m² to produce a pressure of 16 Pa?

[ ]	0.25 N
[ ]	4 N
[x]	64 N
[ ]	64 Kg

Force = pressure x area = 16 x 4 = 64 N. By the way, did you realise that you can immediately rule out the fourth option because Kg is incorrect, it should be kg (no capital letter)

2.

What force is needed on an area of 5 m² to produce a pressure of 25 Pa?

[ ]	5 N
[ ]	20 N
[ ]	30 N
[x]	125 N

Force = pressure x area = 25 x 5 = 125 N

3.

The bottom of a box has an area of 5 m². What is the weight of the box to produce a pressure of 20 Pa?

[ ]	4 N
[x]	100 N
[ ]	4 kg
[ ]	100 kg

Force = 20 x 5 = 100 N. Remember weight is a force so the two kilogram answers cannot possibly be correct as kilograms are the units of mass, not force

4.

The bottom of a box has dimensions 2 m by 3 m. What is the weight of the box to produce a pressure of 20 Pa?

[ ]	4 N
[ ]	26 N
[ ]	100 N
[x]	120 N

Area = 2 x 3 = 6 m², force = 20 x 6 = 120 N

5.

A four legged table exerts a pressure of 8,000 Pa on the ground. Each leg has an area of 0.01 m². What is the weight of the table?

[ ]	32 N
[ ]	80 N
[x]	320 N
[ ]	320 kg

Force = pressure x area = 8,000 x (4 x 0.01) = 320 N

6.

The dimensions of a ski are 8 cm x 150 cm. What is the weight of a skier standing on 2 skis to produce a pressure of 2,500 Pa?

[ ]	500 N
[x]	600 N
[ ]	900 N
[ ]	2,400 N

Area of ski = 0.08 x 1.50 = 0.12 m² x 2 (for 2 skis), force = pressure x area = 2,500 x 0.24 = 600 N

7.

What has to happen to the force exerted over a fixed area if the pressure doubles?

[ ]	The force must decrease
[x]	The force must double
[ ]	The force must increase
[ ]	The force must stay the same

There is a direct positive correlation between force and pressure if the area remains the same

8.

What has to happen to the force exerted if the area doubles but the pressure is unchanged?

[ ]	The force must decrease
[x]	The force must double
[ ]	The force must increase
[ ]	The force must stay the same

There is a direct positive correlation between force and area if the pressure remains the same

9.

Box A has a weight of 20 N. It is put on top of box B. These two boxes exert a pressure of 60 Pa. The area box B covers is 3 m². Find weight of box B.

[ ]	60 N
[ ]	80 N
[x]	160 N
[ ]	180 N

Force = 60 x 3 = 180 N, box A = 20 N so box B = 180-20 N

10.

A person at a fancy dress party is wearing a trainer on one foot and a shoe with a stiletto heel on the other! Which exerts the most pressure on the ground?

[ ]	Both the same
[x]	Stiletto heel
[ ]	They don't exert a pressure
[ ]	Trainer

The force (person's weight) is the same on both feet but a stiletto heel has a smaller area. This is why stiletto heels can damage wooden floors