7 Pressure 20 21 22 PYQ [EUT]

Which quantities, in addition to the acceleration of free fall g, affect the pressure at the bottom of a pond of water?

• the density of the water and the depth of the pond only

• the density of the water and the surface area of the pond only

• the depth of the pond and the surface area of the pond only

• the depth of the pond, the density of the water and the surface area of the pond

Which statement describes how and why the pressure changes as the gauge is lowered?

• The density of the sea water decreases so the pressure increases.

• The depth of the gauge below the surface of the sea increases so the pressure increases.

• The height of the gauge above the sea bed decreases so the pressure decreases.

• The temperature of the sea water decreases so the pressure decreases.

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

• A

• B

• C

• D

A manometer containing water is used to measure the pressure of a gas supply, as shown. The density of water is 1000 kg/m³. What is the pressure of the gas supply?

• 300 Pa above atmospheric pressure

• 400 Pa above atmospheric pressure

• 3000 Pa above atmospheric pressure

• 4000 Pa above atmospheric pressure

The diagram shows a tank containing sea water. The density of the sea water is 1020 kg/m³. What is the pressure at point P relative to atmospheric pressure?

• 7400 Pa above atmospheric pressure

• 7500 Pa above atmospheric pressure

• 75000 Pa above atmospheric pressure

• 82000 Pa above atmospheric pressure

Liquid of mass 92 kg is contained in a rectangular tank.

The area of the base of the tank is 0.23 m².

What is the pressure exerted by the liquid on the base of the tank?

• 2.5 × 10⁻⁴ N/m²

• 2.5 × 10⁻³ N/m²

• 400 N/m²

• 4000 N/m²

The diagram shows a deep reservoir formed by a dam.

On what does the pressure at X depend?

• the depth of the water at X

• the length of the reservoir

• the surface area of the water

• the thickness of the dam wall

Which block exerts the greatest pressure on its base?

• A

• B

• C

• D

A force of 14 N is applied to the head of a nail. This causes a pressure of 25 N/mm² at the tip of the nail. What is the cross-sectional area of the tip of the nail?

• 0.56 mm²

• 11 mm²

• 39 mm²

• 350 mm²

The box shown has a weight of 15N.

The box is resting on a horizontal surface with face P in contact with the surface. What is the change in pressure on the surface if the box falls over onto face Q?

• 0.0040 m²/N

• 0.0067 m²/N

• 100 N/m²

• 200 N/m²