1. . The velocity of light is:
(A) 3 × 10⁵ m/s
(B) 330 km/s
(C) 330 m/s
(D) 3 × 10⁸ m/s
2. . Light waves are:
(A) Mechanical waves
(B) Longitudinal waves
(C) Electromagnetic waves
(D) Matter waves
3. . Corpuscular theory of light was propounded by:
(A) Maxwell
(B) Huygens
(C) Einstein
(D) Newton
4. . Wave theory of light was proposed by:
(A) Huygens
(B) Newton
(C) Maxwell
(D) Einstein
5. . The turning back of a part of light from the boundary of a medium is called:
(A) Refraction
(B) Rarefaction
(C) Polarization
(D) Reflection
6. . The bending of light when it enters from one medium to the other is called:
(A) Refraction
(B) Reflection
(C) Dispersion
(D) Diffraction
7. . The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for all angles of incidence. This law is known as:
(A) Lenz’s law
(B) Hook’s law
(C) Snell’s law
(D) Law of reflection
8. . The relationship between focal length ‘f’ and radius of curvature ‘r’ of a spherical mirror is:
(A) f = 2r
(B) f = 2r²
(C) f = r/2
(D) R = 2f²
9. . If an object is placed at C of the concave mirror, then the image formed will be:
(A) At F
(B) Behind the mirror
(C) At C
(D) In between C and F
10. . If an object is placed within the focal length of a concave mirror then the image formed will be:
(A) Real and erect
(B) Virtual and inverted
(C) Real and behind the mirror
(D) Virtual and behind the mirror
11. . The radius of curvature of a concave mirror is 40 cm, its focal length will be equal to:
(A) 80 cm
(B) 40 cm
(C) 20 cm
(D) 4 cm
12. . The unit for the power of lens is:
(A) Dioptre
(B) cm
(C) meter
(D) Watt
13. . The focal length of a lens is 20 cm; its power in dioptre will be equal to:
(A) 20 D
(B) 0.5 D
(C) 2 D
(D) 5 D
14. . If an object is placed in front of a convex lens in between its F and 2F then the image will be:
(A) Virtual
(B) Erect
(C) Real and inverted
(D) Real and erect
15. . The least distance of distinct vision is:
(A) 20 cm
(B) 15 cm
(C) 25 cm
(D) 5 cm
16. . A convex lens of short focal length is used as:
(A) Compound microscope
(B) Simple microscope
(C) Simple telescope
(D) Sextant
17. . Magnifying power ‘M’ of a simple microscope is equal to:
(A) 1 + q/f
(B) 1 - d/f
(C) 1 + d/f
(D) 1 - q/f
18. . The phenomenon of bending of incident light towards the geometrical shadow of a sharp wedge is called:
(A) Dispersion of light
(B) Diffraction of light
(C) Polarization of light
(D) Interference of light
19. . To measure the height of distant objects we use:
(A) Camera
(B) Telescope
(C) Microscope
(D) Sextant