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