1. . The velocity of light is:
(A) 3 × 10⁸ m/s
(B) 330 km/s
(C) 330 m/s
(D) 3 × 10⁵ 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) Newton
(B) Huygens
(C) Einstein
(D) Maxwell
4. . Wave theory of light was proposed by:
(A) Newton
(B) Huygens
(C) Maxwell
(D) Einstein
5. . The turning back 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 another is called:
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Diffraction
7. . The ratio of sin(i) to sin(r) is constant. This law is known as:
(A) Snell’s law
(B) Hook’s law
(C) Lenz’s law
(D) Law of reflection
8. . If an object is placed at C of a concave mirror, the image formed will be:
(A) At F
(B) Behind the mirror
(C) At C
(D) Between C and F
9. . If an object is placed within the focal length of a concave mirror, the image will be:
(A) Real and erect
(B) Virtual and inverted
(C) Real and behind the mirror
(D) Virtual and behind the mirror
10. . The radius of curvature of a concave mirror is 40 cm. Its focal length is:
(A) 80 cm
(B) 20 cm
(C) 40 cm
(D) 4 cm
11. . The unit for the power of a lens is:
(A) Watt
(B) cm
(C) meter
(D) dioptre
12. . The focal length of a lens is 20 cm. Its power is:
(A) 20 D
(B) 0.5 D
(C) 2 D
(D) 5 D
13. . If an object is placed between F and 2F of a convex lens, the image will be:
(A) Virtual
(B) Erect
(C) Real and inverted
(D) Real and erect
14. . The least distance of distinct vision is:
(A) 20 cm
(B) 25 cm
(C) 15 cm
(D) 5 cm
15. . A convex lens of short focal length is used as:
(A) Simple microscope
(B) Compound microscope
(C) Simple telescope
(D) Sextant
16. . The bending of light towards the shadow region is called:
(A) Dispersion
(B) Interference
(C) Polarization
(D) Diffraction
17. . To measure the height of distant objects we use:
(A) Camera
(B) Telescope
(C) Microscope
(D) Sextant