Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Units (Solids, Liquids and Gases)
69 practice questions
Topics covered
Practice questions
31–33 of 33 · Easy
Question 31
3 marks · Easy
Answer and see the solution →Figure 1 shows a simple barometer using oil instead of mercury. The oil has a density of 900 kg/m³. The height of the oil column is 1.4 m. Take g = 10 N/kg.
Figure 1: Simple oil barometer (a)[2 marks]Calculate the atmospheric pressure in Pascals.
(b)[1 mark]Suggest why mercury is usually used in barometers rather than oil.
Question 32
4 marks · Easy
Answer and see the solution →A solid metal block is dropped into a tank of water so that it sinks to the bottom. The block has a mass of 0.60 kg and a volume of 0.0002 m³.
(a)[2 marks]Calculate the density of the metal block in kg/m³.
(b)[1 mark]Use the equation for pressure in liquids to write down the formula linking pressure difference, height, density, and gravitational field strength.
(c)[1 mark]Explain why the metal block sinks in water, using your answers.
Question 33
4 marks · Easy
Answer and see the solution →A diver descends in the sea to a depth of 15 m. The density of seawater is 1025 kg/m³. Take gravitational field strength g = 10 N/kg.
(a)[2 marks]Calculate the increase in pressure on the diver at this depth, relative to the surface.
(b)[1 mark]Describe how pressure in a liquid acts on the diver at this depth.
(c)[1 mark]Explain how the force on a part of the diver’s body can be calculated using pressure and area.