Human Eye and the Colourful World Multiple Choice Questions and Answers for Practice

16. Mirage is formed because:

1. air above the ground is very hot and air above is cooler
2. both a and d are correct
3. light rays from a distant object bend towards the normal when coming towards the ground.
4. light rays from a distant object bend away from the normal when coming towards the ground.

17. Mirages are common in

1. rainforests
2. dry forests
3. deserts
4. highlands

18. Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.

1. Isaac Newton
2. Einstein
3. Kepler
4. Hans Christian Oersted

19. One cannot see through the fog, because

1. refractive index of the fog is very high
2. light suffers total reflection at droplets
3. fog absorbs light
4. light is scattered by the droplets

20. Rainbows are created by sunlight

1. water particles
2. wind
3. dust particles
4. snow

21. Reason behind advance sunrise and delayed sunset

1. atmospheric refraction
2. total internal reflection
3. dispersion
4. reflection

22. Refraction of light by the earth's atmosphere due to variation in air density is called

1. atmospheric reflection
2. atmospheric dispersion
3. atmospheric scattering
4. atmospheric refraction

23. Select the colours in the correct ascending of wavelength:

1. blue, green, red
2. orange, green. Red
3. blue, yellow, green
4. orange, yellow, green

24. Sunlight passes through a canopy of a dense forest is due to

1. Raman effect
2. Newton's ring
3. Spectral effect
4. Tyndall effect

25. The air layer of atmosphere whose temperature is less than the hot layer behave as optically

1. denser medium
2. rarer medium
3. inactive medium
4. either denser or rarer medium

26. The blue colour of the sky is because

1. red colour is scattered more as compared to other colours.
2. red colour is absorbed more as compared to other colours
3. blue colour is scattered more as ccompared to other colours
4. blue colour is absorbed more as compared to other colours

27. The bluish colour of water in deep sea is due to

1. the presence of algae and other plants found in water
2. reflection of sky in water
3. scattering of light
4. absorption of light by the sea

28. The clear sky appears blue because

1. blue light gets absorbed in the atmosphere.
2. ultraviolet radiations are absorbed in the atmosphere.
3. violet and blue lights get scattered more than lights of all other colours by the atmosphere.
4. light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

29. The colour of a star is an indication of its

1. weight
2. distance
3. temperature
4. size

30. The colour of sky appears blue, it is due to the

1. refraction of light through the atmosphere
2. dispersion of light by air molecules
3. scattering of light by air molecules
4. all of these