KS3 Science Quiz - Light 02 (Questions)

Let's take another look at light in this KS3 Science quiz. Light travels in straight lines but we can change its direction of travel quite easily using mirrors and lenses. A lens is made from a piece of transparent material, often glass, and it has curved surfaces. When light enters a transparent material at a right angle, it continues on its journey in exactly the same direction. If light enters the transparent material at an angle, it is refracted (bent). The first good lenses were made by a Dutch cloth merchant in the 17th century so that he could check the quality of cloth more carefully. He used two of his lenses to invent the world's first telescope.

Colour is an amazing thing. Daylight contains all of the colours of the rainbow - we say it is white light. If you look at a red object in daylight, it looks red, a blue object looks blue. The reason for this is that the red object reflects only red light and the blue object only reflects blue light. Now, if you look at a red object in red light, it still looks red but the blue object would look black - there is no blue light for it to reflect. Black is the absence of all colours, something that is black is therefore absorbing all of the light that falls on it.

1. In a solar eclipse, which of the following is true?
[ ] The Earth is between the Sun and the Moon
[ ] The Moon and the Earth are at right angles to each other
[ ] The Moon is between the Sun and the Earth
[ ] The Sun is between the Moon and the Earth
2. When light travels from air to glass it does which of the following?
[ ] It is all reflected
[ ] It slows down
[ ] It speeds up
[ ] It travels in the same direction
3. Which of the following statements about light travelling from air to water is true?
[ ] It is mainly deflected
[ ] It is mainly dispersed
[ ] It is mainly reflected
[ ] It is mainly refracted
4. When light travels from air to glass at any angle other than ninety degrees, which of the following is true?
[ ] It bends away from the normal
[ ] It bends towards the normal
[ ] The direction will not change
[ ] The speed is unchanged
5. Light from the Sun is called:
[ ] Blue light
[ ] Red light
[ ] White light
[ ] Yellow light
6. Colours are caused by light having different:
[ ] Frequencies and speed
[ ] Frequencies and wavelengths
[ ] Speeds
[ ] Wavelengths and speed
7. Light can be split into colours of the spectrum using a prism. What is this process called?
[ ] Deflection
[ ] Dispersion
[ ] Reflection
[ ] Refraction
8. The three primary light colours are:
[ ] Blue, green and yellow
[ ] Red, blue and green
[ ] Red, blue and yellow
[ ] Red, green and yellow
9. Why does grass look green in daylight?
[ ] It absorbs green and yellow light
[ ] It absorbs green light
[ ] It reflects green and yellow light
[ ] It reflects green light
10. A red filter will only:
[ ] Stop blue light
[ ] Stop green and yellow light
[ ] Stop red light
[ ] Transmit red light
KS3 Science Quiz - Light 02 (Answers)
1. In a solar eclipse, which of the following is true?
[ ] The Earth is between the Sun and the Moon
[ ] The Moon and the Earth are at right angles to each other
[x] The Moon is between the Sun and the Earth
[ ] The Sun is between the Moon and the Earth
In a lunar eclipse the Earth is between the Sun and the Moon
2. When light travels from air to glass it does which of the following?
[ ] It is all reflected
[x] It slows down
[ ] It speeds up
[ ] It travels in the same direction
Some of it is reflected but most of it passes into the glass because glass is transparent
3. Which of the following statements about light travelling from air to water is true?
[ ] It is mainly deflected
[ ] It is mainly dispersed
[ ] It is mainly reflected
[x] It is mainly refracted
A little of the light is reflected, but if the light enters the water at exactly a right angle, it will continue on in the same direction as it was travelling in air
4. When light travels from air to glass at any angle other than ninety degrees, which of the following is true?
[ ] It bends away from the normal
[x] It bends towards the normal
[ ] The direction will not change
[ ] The speed is unchanged
The normal is a line drawn on a ray diagram to help to work out what will happen to a ray of light
5. Light from the Sun is called:
[ ] Blue light
[ ] Red light
[x] White light
[ ] Yellow light
It contains all of the colours of the rainbow
6. Colours are caused by light having different:
[ ] Frequencies and speed
[x] Frequencies and wavelengths
[ ] Speeds
[ ] Wavelengths and speed
Red light has the longest wavelength and lowest frequency
7. Light can be split into colours of the spectrum using a prism. What is this process called?
[ ] Deflection
[x] Dispersion
[ ] Reflection
[ ] Refraction
Isaac Newton was the first person to investigate this
8. The three primary light colours are:
[ ] Blue, green and yellow
[x] Red, blue and green
[ ] Red, blue and yellow
[ ] Red, green and yellow
They are different from the primary colours of art
9. Why does grass look green in daylight?
[ ] It absorbs green and yellow light
[ ] It absorbs green light
[ ] It reflects green and yellow light
[x] It reflects green light
In 1867 John Tyndall discovered why the sky is blue. Particles in the air scatter blue light more than red
10. A red filter will only:
[ ] Stop blue light
[ ] Stop green and yellow light
[ ] Stop red light
[x] Transmit red light
It absorbs all of the other colours of light