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Question 1. What device uses light from the sun to produce electricity? 2. What causes wind? 3. What does a transformer do? 4. How is an alternating current (AC) different from a direct current (DC) 5. Write down 3 examples of a fossil fuel 6. What happens when a coil of wire is rotated inside a magnetic field? 7. What is the unit of electrical power 8. How is high level radioactive waste disposed of? 9. Which type of ionising radiation can penetrate several metres of lead? 10. Write down 3 sources of background radiation 11. What is red shift? 12. Which metal is present in the Earth’s core in large amounts? 13. What are solar flares? 14. What is the common name for Aurora Borealis? 15. Which planet is closest in orbit to our Sun? 16. Which force keeps the Earth in orbit around the Sun? 17. What body in space is made of ice and dust? 18. What do scientists believe happened 15 billion years ago to form the universe? 19. What is a measure of the rate at which energy is used? 20. Why is ionising radiation considered harmful? Answer A photocell The temperature difference between land surfaces causes a convection current, this movement of air is called wind A transformer increases or decreases the voltage of an alternating current DC = the electrons always flow in the same direction, AC = the electron flow continuously changes direction. Gas, Coal and Crude oil An electrical current is generated Watt (W) Stored in concrete and steel drums and buried deep underground Gamma waves Cosmic rays, nuclear power, radioactive gas (radon), rocks, food, medical equipment (eg: X-rays), industry, luminous paint. When a light emitting object is moving away at high speed the light from it appears to increase in wavelength, it moves towards the red end of the visible spectrum. Iron A violent explosion from the surface of the Sun The Northern Lights Mercury Centripetal force (the force of gravity pulls the planet towards the Sun) A comet The Big Bang Power (Power = voltage x current) Can damage DNA, this causes mutations. Question 1. What device uses light from the sun to produce electricity? 2. What causes wind? 3. What does a transformer do? 4. How is an alternating current (AC) different from a direct current (DC) 5. Write down 3 examples of a fossil fuel 6. What happens when a coil of wire is rotated inside a magnetic field? 7. What is the unit of electrical power 8. How is high level radioactive waste disposed of? 9. Which type of ionising radiation can penetrate several metres of lead? 10. Write down 3 sources of background radiation 11. What is red shift? 12. Which metal is present in the Earth’s core in large amounts? 13. What are solar flares? 14. What is the common name for Aurora Borealis? 15. Which planet is closest in orbit to our Sun? 16. Which force keeps the Earth in orbit around the Sun? 17. What body in space is made of ice and dust? 18. What do scientists believe happened 15 billion years ago to form the universe? 19. What is a measure of the rate at which energy is used? 20. Why is ionising radiation considered harmful? Answer A photocell A transformer increases or decreases the voltage of an alternating current Gas, Coal and Crude oil Watt (W) Gamma waves When a light emitting object is moving away at high speed the light from it appears to increase in wavelength, it moves towards the red end of the visible spectrum. A violent explosion from the surface of the Sun Mercury A comet Power (Power = voltage x current) The temperature difference between land surfaces causes a convection current, this movement of air is called wind DC = the electrons always flow in the same direction, AC = the electron flow continuously changes direction. An electrical current is generated Stored in concrete and steel drums and buried deep underground Cosmic rays, nuclear power, radioactive gas (radon), rocks, food, medical equipment (eg: X-rays), industry, luminous paint. Iron The Northern Lights Centripetal force (the force of gravity pulls the planet towards the Sun) The Big Bang Can damage DNA, this causes mutations. There are 20 questions (1 per student). Every student has a full table to complete with every answer. Each student also receives one answer. All answers must be completed by asking other students for the answer in their possession.