Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Solids, Liquids and Gases
279 practice questions
Topics covered
Practice questions
141–144 of 144 · Normal
Question 141
5 marks · Normal
Answer and see the solution →A student places a wooden block on a bench and wants to find the pressure it exerts on the surface. After, she measures the density of a sample of oil.
(a)[3 marks]The wooden block has a mass of 2.5 kg and its base measures 0.10 m by 0.20 m. Calculate the pressure the block exerts on the bench. Give your answer in pascals (Pa).
(b)[2 marks]She uses a measuring cylinder to find the volume of a sample of oil. The oil mass is 50 g and its volume is 56 mL. Calculate the density of the oil in kg/m³.
Question 142
5 marks · Normal
Answer and see the solution →A glass tube contains a trapped sample of air. The pressure inside is recorded at different temperatures.
(a)[1 mark]Convert the temperature 25°C to Kelvin.
(b)[4 marks]The initial pressure is 100 kPa at 25°C. What is the pressure if the temperature rises to 75°C, assuming the volume and mass of air remain constant? (Give your answer in kPa, to 2 significant figures.)
Question 143
5 marks · Normal
Answer and see the solution →A metal block is being used in a laboratory investigation.
(a)[3 marks]Describe how you would use apparatus to determine the density of the metal block, including the measurements needed.
(b)[2 marks]The block has a mass of 480 g and its volume is found to be 60 cm³. Calculate its density in kg/m³.
Question 144
4 marks · Normal
Answer and see the solution →A laboratory demonstration shows the random motion of gas particles.
(a)[2 marks]Explain why gases exert pressure on the walls of their container, using the idea of particles.
(b)[2 marks]State and describe one property of gases which is evidence for the random motion of their particles.