Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Astrophysics
156 practice questions
Topics covered
Practice questions
1–10 of 78 · Normal
Question 1
1 mark · Normal
Answer and check →Which of the following is the correct SI unit for gravitational field strength?
- A.N/kg
- B.kg/m
- C.m/s
- D.N·m
Question 2
3 marks · Normal
Answer and see the solution →(a)[2 marks]State the SI unit for (i) force, and (ii) time.
(b)[1 mark]Give the SI unit for acceleration.
Question 3
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 4
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 5
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 6
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 7
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 8
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 9
4 marks · Normal
Answer and see the solution →The diagram below shows a simplified view of the solar system.
(a)[1 mark]Name the star at the center of our solar system.
(b)[1 mark]Give the number of planets that orbit the Sun in our solar system.
(c)[2 marks]State what the word 'orbit' means in the context of the solar system.
Question 10
1 mark · Normal
Answer and check →Which of the following lists objects in increasing order of size (smallest to largest)?
- A.Moon, Planet, Star, Galaxy
- B.Planet, Moon, Star, Galaxy
- C.Star, Planet, Galaxy, Moon
- D.Galaxy, Star, Planet, Moon