Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Astrophysics
156 practice questions
Topics covered
Practice questions
11–20 of 156
Question 11
2 marks · Normal
Answer and see the solution →A student says a planet's mass is '6000 kg'. What is wrong with this answer in the context of planetary science? Explain your answer.
Question 12
2 marks · Normal
Answer and see the solution →A planet has a gravitational field strength of 15 N/kg. What is the weight of a 4 kg object on this planet?
Question 13
3 marks · Normal
Answer and see the solution →A moon has a mass of 7.3 × 10^22 kg. It is in orbit around its planet.
(a)[1 mark]State the SI unit for mass.
(b)[2 marks]Explain why the gravitational force between the moon and its planet is much greater than the force between two footballs of similar size.
Question 14
2 marks · Normal
Answer and see the solution →State two quantities in astrophysics that use the newton (N) as their SI unit. Give one example for each.
Question 15
3 marks · Normal
Answer and see the solution →Complete the table below by writing the SI unit for each quantity.
Quantity SI unit (give symbol) Length Speed Mass (a)[1 mark]Length
(b)[1 mark]Speed
(c)[1 mark]Mass
Question 16
2 marks · Normal
Answer and see the solution →Explain why the unit of speed in astrophysics is usually written as m/s rather than km/h. Give one reason.
Question 17
1 mark · Easy
Answer and check →What is the correct unit for measuring the mass of a planet?
- A.kilogram (kg)
- B.metre (m)
- C.second (s)
- D.newton (N)
Question 18
2 marks · Easy
Answer and see the solution →Name the force responsible for keeping planets in orbit around the Sun. State its unit.
Question 19
1 mark · Easy
Answer and see the solution →State the name of our galaxy.
Question 20
3 marks · Easy
Answer and see the solution →The diagram below shows a simplified arrangement of part of the solar system.
(a)[1 mark]Solar system diagram with star and two objects labelled. A is a planet. B is a moon. Which object, A or B, orbits the Sun directly?
(b)[1 mark]State the object that B (the moon) orbits directly.
(c)[1 mark]What is the name given to the path followed by a planet around the Sun?