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1. What is refraction of light?
A. Bouncing of light from a surface
B. Splitting of light into colors
C. Bending of light when it passes from one medium to another
D. Scattering of light in all directions
Answer: C
2. Light bends towards the normal when it travels from:
A. Water to air
B. Glass to air
C. Air to glass
D. Vacuum to air
Answer: C
3. The speed of light is maximum in:
A. Water
B. Glass
C. Air
D. Vacuum
Answer: D
4. The refractive index of a medium is defined as:
A. Ratio of wavelength to frequency
B. Speed of light in vacuum to speed in the medium
C. Speed of light in the medium to vacuum
D. Frequency divided by speed
Answer: B
5. If the refractive index of water is 1.33, it means:
A. Light travels 1.33 times faster in water than in air
B. Light travels 1.33 times faster in vacuum than in water
C. Light slows down by 1.33 m/s in water
D. Water is denser than glass
Answer: B
6. Which of the following shows refraction?
A. Rainbow in the sky
B. Mirror reflection
C. Coin appearing raised in water
D. Shadow of a tree
Answer: C
7. The phenomenon responsible for twinkling of stars is:
A. Reflection of light
B. Dispersion of light
C. Scattering of light
D. Atmospheric refraction
Answer: D
8. Total internal reflection occurs when:
A. Light passes from rarer to denser medium
B. Angle of incidence is zero
C. Light travels from denser to rarer medium at a large angle
D. Reflection is partial
Answer: C
9. Which of the following devices works on the principle of total internal reflection?
A. Microscope
B. Telescope
C. Optical fibre
D. Lens
Answer: C
10. A periscope uses:
A. Refraction
B. Diffraction
C. Reflection from two plane mirrors
D. Total internal reflection
Answer: C
11. The bending of light at the surface of a prism is due to:
A. Reflection
B. Refraction
C. Diffraction
D. Scattering
Answer: B
12. What is the critical angle?
A. Angle of incidence at which light reflects completely
B. Minimum angle of incidence for total internal reflection
C. Maximum angle of incidence for refraction
D. Angle between two mirrors
Answer: B
13. In which of the following situations is the light refracted?
A. Light falling on a mirror
B. Light passing through a glass slab
C. Light absorbed by a black object
D. Light forming a shadow
Answer: B
14. The rearview reflector in vehicles works on:
A. Dispersion
B. Refraction
C. Total internal reflection
D. Scattering
Answer: C
15. In a periscope, mirrors are placed at an angle of:
A. 30°
B. 45°
C. 60°
D. 90°
Answer: B
16. When light enters from air to water, its wavelength:
A. Increases
B. Decreases
C. Remains the same
D. First increases then decreases
Answer: B
17. A pencil appears bent in water due to:
A. Reflection
B. Diffraction
C. Refraction
D. Dispersion
Answer: C
18. Refractive index has no unit because:
A. It is not measurable
B. It is a ratio of two speeds
C. It is a ratio of two wavelengths
D. It depends on frequency
Answer: B
19. Light travels slower in glass than in air. This is because:
A. Glass is hotter
B. Glass is denser
C. Glass is transparent
D. Glass reflects light
Answer: B
20. The direction of bending of light depends on:
A. Colour of light
B. Wavelength
C. Nature of the medium
D. Shape of the object
Answer: C
21. Mirage observed in deserts is due to:
A. Reflection of light
B. Refraction and total internal reflection
C. Diffraction of light
D. Dispersion of light
Answer: B
22. In an optical fibre, light is transmitted by:
A. Regular reflection
B. Scattering
C. Total internal reflection
D. Polarisation
Answer: C
23. What is the function of cladding in an optical fibre?
A. To absorb light
B. To allow light to escape
C. To reflect light back into the core
D. To refract light
Answer: C
24. A diamond shines brilliantly because of:
A. High density
B. High dispersion
C. High refractive index causing total internal reflection
D. Presence of multiple surfaces
Answer: C
25. The phenomenon of light passing through a glass slab but emerging parallel to the incident ray is called:
A. Dispersion
B. Lateral displacement
C. Scattering
D. Total reflection
Answer: B
26. Apparent depth of a swimming pool is less than real depth due to:
A. Reflection
B. Absorption
C. Refraction
D. Diffraction
Answer: C
27. When white light passes through a prism, it splits due to:
A. Equal refraction of all colours
B. Equal speed of all colours
C. Different speeds of different colours
D. Total internal reflection
Answer: C
28. Which of the following has the highest refractive index?
A. Air
B. Water
C. Glass
D. Diamond
Answer: D
29. The basic principle of a reflector in headlights is:
A. Refraction
B. Scattering
C. Total internal reflection
D. Diffraction
Answer: C
30. In atmospheric refraction, light bends due to:
A. Change in speed of light due to varying air density
B. Reflection from dust particles
C. Dispersion of light
D. Clouds in the sky
Answer: A
Jainism and Budhism Important questions
SCERT Kerala
