G10 IGCSE Pressure (recap)

The diagram shows a manometer containing a liquid. The manometer is used to find the difference between the pressure of a gas and atmospheric pressure. Which distance represents this pressure difference?

• A

• B

• C

• D

The diagram shows a mercury barometer. Which distance is used to calculate the pressure of the atmosphere?

• 25cm

• 75cm

• 80cm

• 100cm

The diagram shows a simple mercury barometer. The atmospheric pressure increases. Which distance increases?

• V W

• W Y

• X Y

• X Z

A man stands on the ground. Which action will increase the pressure that the man exerts on the ground?

• The man slowly bends his knees

• The man slowly lies down on the ground

• The man slowly raises his arms

• The man slowly raises one foot off the ground

Two identical fish tanks are filled to the same level with water. One tank contains fresh water and the other sea water. Sea water is more dense than fresh water. Which fish experiences the greatest pressure?

• A

• B

• C

• D

Water manometer is used to measure the pressure of a gas supply to a house. It gives a reading of h cm of water. Why is it better to use water rather than mercury in this manometer?

• h would be too large if mercury were used

• h would be too small if mercury were used

• The tube would need to be narrower if mercury were used

• The tube would need to be wider if mercury were used

The pressure of a gas is measured using a manometer as shown in the diagram. The mercury in the manometer is replaced with a liquid that is less dense. How does the value of h change?

• It becomes zero

• It decreases but not to zero

• It stays the same

• It increases

The diagram show two mercury barometer standing side by side. The right-hand diagram shows a tube bigger diameter, but the diagram is incomplete. There is a vacuum above the mercury in both tubes. Which labelled position on the right-hand tube could show the mercury level in that tube?

• A

• B

• C

• D

A manometer is used to measure the pressure of air in a container. Which change would give a smaller value of height h?

• using a less dense liquid

• using a more dense liquid

• using a narrower tube

• using a wider tube

The diagram shows a manometer with one side connected to a gas cylinder and the other side open to the atmosphere. Which conclusion can be made using only the information from liquid levels in the manometer?

• density of gas < density of air

• density of gas > density of air

• pressure of gas < atmospheric pressure

• pressure of gas > atmospheric pressure