1. The velocity of light is:
(A) 330 km/s
(B) 3 × 10⁸ m/s
(C) 330 m/s
(D) 3 × 10⁵ m/s
2. Light waves are:
(A) Electromagnetic waves
(B) Longitudinal waves
(C) Mechanical 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) Newton
(B) Einstein
(C) Huygens
(D) Maxwell
5. Reflection of light is:
(A) Refraction
(B) Rarefaction
(C) Reflection
(D) Polarization
6. Bending of light from one medium to another is called:
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Diffraction
7. Ratio of sine of angle of incidence to sine of angle of refraction is called:
(A) Law of reflection
(B) Hook’s law
(C) Lenz’s law
(D) Snell’s law
8. Relation between focal length f and radius of curvature R is:
(A) f = R/2
(B) f = 2R
(C) f = 2R²
(D) R = 2f²
9. Object at C of concave mirror forms image:
(A) At F
(B) At C
(C) Behind the mirror
(D) Between C and F
10. Object within focal length of concave mirror forms image:
(A) Real and erect
(B) Virtual and inverted
(C) Real and behind mirror
(D) Virtual and erect (behind mirror)
11. Radius of curvature = 40 cm, focal length =
(A) 80 cm
(B) 40 cm
(C) 20 cm
(D) 4 cm
12. Unit of power of lens is:
(A) dioptre
(B) cm
(C) meter
(D) Watt
13. Focal length = 20 cm, power =
(A) 20 D
(B) 0.5 D
(C) 5 D
(D) 2 D
14. Object between F and 2F of convex lens image is:
(A) Virtual
(B) Erect
(C) Real and erect
(D) Real and inverted
15. Least distance of distinct vision is:
(A) 20 cm
(B) 25 cm
(C) 15 cm
(D) 5 cm
16. Convex lens of short focal length is used as:
(A) Simple telescope
(B) Compound microscope
(C) Simple microscope
(D) Sextant
17. Magnifying power of simple microscope:
(A) 1 + q/f
(B) 1 − d/f
(C) 1 + d/f
(D) 1 − q/f
18. Bending of light around sharp edges is called:
(A) Dispersion
(B) Interference
(C) Polarization
(D) Diffraction
19. To measure height of distant objects we use:
(A) Camera
(B) Telescope
(C) Sextant
(D) Microscope