Light

1. Which of these statements is true? Light travels in straight lines. Light is stopped when it meets a solid object. Light does not travel in straight lines. Light will only travel for about 2000km before it stops.

2. Which of these is not a source of light? a light bulb the Sun a mirror a TV

3. Shadows are formed because: light will only travel a certain distance before it stops. a substance called ‘darkness’ collects behind some objects. some objects do not give out light in all directions. light cannot go through some objects.

4. Which statement is true? Sound travels faster than light. Sound will not travel. Only light can travel. Light travels faster than sound. Light and sound travel at the same speed.

5. Objects that light can easily pass through are said to be: transparent. apparent. opaque. oblong.

6. Which phrase best completes the following sentence 6. Which phrase best completes the following sentence? We see things because: they are luminous. the Sun shines on them. light from them enters our eyes. light from our eyes shines on them.

7. Opaque objects can: transmit and reflect light. transmit and absorb light. reflect and absorb light. only reflect light.

8. Which of these will absorb the most light? a white sheet of paper a sheet of clear glass a black piece of card an orange piece of card

9. Which of these statements is true? Light bounces evenly off rough surfaces. Light bounces evenly off smooth surfaces like mirrors. Light bounces off mirrors in all directions. Light does not bounce off mirrors.

10. A plane mirror is: a curved mirror. a convex mirror. a flat mirror. a mirror used in aeroplanes.

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11. How big will the angle of reflection be? 20° 30° 40° 60° 30

12. Your image in a mirror: is not as good looking as you really are. is upside down. is always bigger than you. seems to be behind the mirror.

13. Refraction is what happens when light: hits an opaque object. bounces off a mirror. is scattered by a rough surface. bends as it goes from one substance into another.

14. Refraction occurs because: light speeds up when it meets a denser transparent material. light slows down when it meets a denser transparent material. light stops when it meets a denser transparent material. light reflects inside denser transparent materials.

15. How fast is light in metres per second? 300 3 000 3 000 000 300 000 000

16. Where does refraction take place? in the centre of a transparent substance all the way through a transparent substance as light travels from one opaque substance into another as light travels from one transparent substance into another

17. Which statement is not true? A rainbow is a spectrum of colours. White light is made up of many colours. A spectrum can only be made using paints. A prism can split white light into a spectrum.

18. The three primary colours for light are: red, blue and yellow. red, blue and green. red, yellow and green. yellow, blue and green.

19. A red filter: absorbs red light. lets through all colours of light. only lets red light through. changes all the colours into red light.

20. Blue objects look blue because: they reflect all colours. they refract all colours. they absorb blue light. they reflect blue light.

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