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1. A rainbow is formed due to
A. Refraction only
B. Reflection only
C. Refraction, dispersion, and internal reflection
D. Scattering only
2. A rainbow is always formed in a direction
A. Towards the Sun
B. Opposite to the Sun
C. At right angles to the Sun
D. Below the Sun
3. Twinkling of stars is caused by
A. Reflection
B. Dispersion
C. Atmospheric refraction
D. Scattering
4. Why don’t planets twinkle?
A. They are closer and appear extended sources
B. They have their own light
C. They are bigger in size
D. They reflect less light
5. The Sun is visible to us about 2 minutes before actual sunrise due to
A. Dispersion
B. Scattering
C. Atmospheric refraction
D. Reflection
6. The apparent flattening of the Sun at sunrise and sunset is due to
A. Scattering
B. Dispersion
C. Atmospheric refraction
D. Internal reflection
7. The Tyndall effect is caused due to
A. Refraction of light
B. Dispersion of light
C. Scattering of light by colloidal particles
D. Reflection of light
8. The colour of the clear sky is blue because
A. Red light scatters most
B. Blue light scatters more than red
C. Sun emits only blue light
D. Atmosphere absorbs red light
9. Danger signals are red because
A. Red scatters the most
B. Red is absorbed by fog
C. Red is least scattered by fog or smoke
D. Red looks brighter than other colours
10. The least scattered colour in the atmosphere is
A. Violet
B. Green
C. Blue
D. Red
11. The screen in the human eye where the image is formed is
A. Cornea
B. Retina
C. Iris
D. Pupil
12. The signals from the retina are transmitted to the brain through
A. Ciliary muscles
B. Optic nerve
C. Iris
D. Cornea
13. Which part of the human eye is a transparent bulge at the front surface?
A. Lens
B. Retina
C. Cornea
D. Iris
14. Excessive curvature of the eye lens or elongation of the eyeball causes
A. Hypermetropia
B. Presbyopia
C. Myopia
D. Cataract
15. The human eye works like a
A. Microscope
B. Camera
C. Telescope
D. Projector
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