ETV – The Science of Colour of Light Light, Colours & Beyond

1. Newton made a triangular glass prism to study colours in year ________.

1676

1666

1066

1566

2.White light passes through a triangular prism, it breaks down into light rays of different colours,

from right to left, the first light colour appears is

green

violet

red

blue

3. Dispersion breaks down white light into light rays of different colours. There is no distinct borders between

colours, with one colour gradually merging into another, scientists called this band of colour

the rainbow.

the spectrum.

the dispersion.

the electromagnetic spectrum.

4. Triangular prism causes dispersion of white light to give a range of colours. Why?

Light rays of different colours have the same speed in air.

After entering into glass, light rays of different colours experience different degree of refraction.

Prism filters the white light.

Prism adds colours to white light.

5. Triangular prism causes dispersion of white light to give a range of colours. Which colour

light is most refracted?

White light

Red light

Violet light

Green light

6. Which of the followings are criteria of seeing a rainbow?

(I) & (II) only

(I), (II) & (III)

(I), (III) & (IV)

(I), (II), (III) & (IV)

(I)When the sun comes out after a shower.

(II)Turn a little away from the sun.

(III)Facing the sky.(IV)Facing the sun.

7. Which of the following causes refraction of white light in the air and forms a

rainbow? Water vapour

Oxygen in the air

Dust in the air

Water droplets in the atmosphere

8. State how many times will white light refract and reflect in the water droplet to form

the rainbow. Refracted once.

Refracted twice.

Reflected once and refracted twice.Reflected and refracted once respectively.

9. Red, blue and green light can combine to form

the colour black

colours of yellow, cyan and magenta

light of any colours

white light only

10. Appearance of colours on a TV screen is due to ________.

refraction

mixing of colour lights

Subtraction of colour lights

dispersion

11. The sense of colours is produced when _______ in the eye ball are activated.

Cornea cells

Rod cells

Nerve cells

Cone cells

12. Which of the following correctly states the approximate number of rod cells and cone

cells on the retina? Six hundred million of rods and ten million of cones.

one hundred and twenty million of cones and six to seven millions of rods.

one hundred and twenty million of rods and six to seven millions of cones.

Six hundred million of cones and ten million of rods.

13. Objects will appear to be _____ in a person with total colour blindness.

Black and white coloured

Grey in colour

Multi-coloured

Red in colour

14. The colour of an object refers to

the colours of light it reflects

the colours of light it absorbs

the colours it possesses

the paints on its surface

15. When red paint mixes with green paint, _______ colour will appear.

yellow

blue

dull dark purple

white

16. Sodium vapour lamp mainly gives out

red light

yellow light

white light

green light

17. A blue car appears to be _________ in colour under the illumination of sodium

vapour lamp in the dark. yellow

grey

red

blue

18. Which of the following colour light is scattered by particles in the air when the sun

is directly overhead?

red

green

blue

yellow