Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Waves
356 practice questions
Topics covered
Practice questions
241–250 of 356
Question 241
1 mark · Easy
Answer and check →Which of the following is a common use of microwaves?
- A.Heating food in microwave ovens
- B.Medical X-rays for imaging bones
- C.Detecting heat loss with infrared cameras
- D.Controlling TVs with a remote control
Question 242
3 marks · Easy
Answer and see the solution →Microwaves are widely used in satellite communication and cooking.
(a)[1 mark]State one reason why microwaves are suitable for use in satellite communications.
(b)[2 marks]Explain why metal screens are used in the doors of microwave ovens.
Question 243
2 marks · Easy
Answer and see the solution →Explain one possible detrimental effect of excessive exposure to microwaves on the human body. Suggest one way to reduce the risk.
Question 244
4 marks · Normal
Answer and see the solution →Microwaves are used in a variety of everyday applications.
(a)[2 marks]State two uses of microwaves, other than for cooking food.
(b)[2 marks]Explain why microwaves are suitable for the uses in part (a).
Question 245
3 marks · Normal
Answer and see the solution →Microwave ovens have metal screens on the doors.
(a)[2 marks]Explain why it is important for microwave ovens to have metal screens.
(b)[1 mark]Describe what could happen if a microwave oven did not have a metal screen.
Question 246
4 marks · Normal
Answer and see the solution →Microwaves are used in mobile phones to carry signals.
(a)[2 marks]Describe one benefit and one risk of using microwaves in mobile phone technology.
(b)[1 mark]Suggest one way people can reduce the risk you described in part (a).
(c)[1 mark]Explain why mobile phone microwaves do not cook your brain.
Question 247
3 marks · Normal
Answer and see the solution →A company is designing a new microwave oven. They want to ensure it is both efficient and safe.
(a)[2 marks]Explain how microwaves heat food inside an oven.
(b)[1 mark]Describe one design feature that makes a microwave oven safe for users.
Question 248
4 marks · Normal
Answer and see the solution →Microwaves are part of the electromagnetic spectrum and have a wide range of applications.
(a)[2 marks]Explain why microwaves are used to send signals to and from satellites, rather than radio waves.
(b)[2 marks]Describe one reason why microwave ovens cook food differently compared to conventional ovens.
Question 249
1 mark · Normal
Answer and see the solution →Which of the following is a detrimental effect of excessive exposure to microwaves in the home?
- A.Can cause burns to human tissue
- B.Causes electric shocks
- C.Can permanently magnetise metals
- D.Can damage bone structure
Question 250
3 marks · Normal
Answer and see the solution →A student is comparing different ways microwaves and radio waves are used in technology. Complete the table below by stating one key use for each wave, and one safety concern linked to each.
Wave Example of a use One safety concern Microwaves Radio waves