20 questions
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 2000 km before it stops.
Which of these statements is not true?
Opaque objects reflect or absorb light.
Transparent objects let light pass through them.
Translucent objects scatter the light that passes through them.
Translucent objects do not reflect light
Which phrase best completes the following sentence? We can read a book because:
it is luminous.
A light shines on it
light is reflected by the book and enters our eyes.
light from our eyes shines on the book
Which statement is true?
A Sound travels faster than light.
B Light does not travel. It is either on or off.
C Light travels faster than sound.
D Light and sound travel at the same speed.
Which of these statements is true?
A Light bounces evenly off rough surfaces.
B Light bounces evenly off smooth surfaces such as mirrors.
C Light bounces off mirrors in all directions.
D Light does not bounce off mirrors.
A plane mirror is:
A a flat mirror.
B a curved mirror.
C a shiny mirror.
D a mirror used in aeroplanes.
How big will the angle of reflection be?
A 20°
B 40°
C 30°
D 60°
Your image in a mirror:
A is always smaller than you
B is upside down.
C is always bigger than you.
D seems to be behind the mirror
Refraction is what happens when light:
A hits an opaque object.
B bounces off a mirror.
C is scattered unevenly by a rough surface.
D changes direction as it goes from one substance into another.
Refraction occurs because:
A light speeds up when it goes from air to glass or water.
B light slows down when it goes from air to glass or water.
C light stops when it goes from air to glass or water.
D light reflects inside transparent materials.
Which diagram shows the correct rays?
A
B
C
D
Why does a lens change the path of light?
A Light changes direction when it goes into the lens and when it comes out of it.
B Light changes direction in the centre of the lens.
C Light is reflected by the surface of the lens.
D Light travels faster in glass than it does in air.
Which part of a camera changes energy transferred by light into electrical signals?
A sensor
B lens
C shutter
D memory card
Which of these parts of the eye are transparent?
A lens only
B lens and retina
C lens and cornea
D lens and iris
Which statement is not correct?
A Our retinas have rod cells and cone cells.
B Rod cells detect different colours.
C There are three types of cone cells that detect red, blue and green light.
D Cells in the retina convert energy transferred by light into nerve impulses.
Which of these camera parts does not have an equivalent in the eye?
A aperture
B shutter
C sensor
D lens
Which statement is not true? .
A A rainbow is a spectrum of colours.
B White light is made up of many colours
C A spectrum can only be made using paints.
D A prism can split white light into a spectrum.
A red filter:
A absorbs red light.
B lets through all colours of light.
C only lets red light through.
D changes all the colours into red light.
Blue objects look blue because:
A they reflect all colours.
B they refract all colours.
C they absorb blue light.
D they reflect blue light.
Danny is wearing white shorts and a red shirt. Which statement is most likely to be true?
A In blue light, his shorts look blue and his shirt looks black.
B In blue light, his shorts look blue and his shirt looks red.
C In red light, his shorts look red and his shirt looks black.
D In green light, his shorts look red and his shirt looks yellow.