Physics Light

1. The ; least distance of distinct vision for human eye: a) 25 cm b) 2.5 cm c) 30 cm d) 35 cm

2. The ratio of size of the image to the size of object is called: a) Focal length b) Magnification c) Optical center d) Refractive index

3. An object placed within the focal length of a convex lens it forms: a) Real & diminished Image b) Real & Magnified Image c) Virtual & diminished d) Virtual & enlarged

4. In compound microscope the objective lens has: a) Large focal length than eyepiece b) Short focal length than eyepiece c) Same focal length as eyepiece d) None of these

5. The eye piece of ; compound microscope is used as: a) Mirror b) Plane glass sheet c) Concave Lens d) Magnifying glass

6. A Compound ; microscope is consist of : a) Two concave lenses of same focal ; lengths b) Two convex lenses of different focal lengths c) One concave of large and one convex lens of short focal length d) Two convex lenses of same focal lengths

7. For total internal reflection the light ray must pass through: a) Rarer to denser medium b) Denser to denser medium c) Denser to rarer medium d) Rarer to rarer medium

8. The 32; fastest medium for the transmission of light is: a) Water b) Steel c) Optical fiber d) metal

9. a smooth plane, polished surface the reflects light is called as: a) Mirror b) Glass c) Lens d) Concave lens

10. Convex mirror always form: a) Real and inverted image b) Virtual and inverted image c) Virtual and erect d) Real and erect

11. The distance between the ; pole and the center of curvature of a spherical mirror is called as: a) Radius of curvature b) Focal length c) Image distance d) Object distance

12. The magnifying power of a simple microscope is:- a) 2 + f / d b) 1 - d / f c) 1 + d / f d) 1 + f / d

13. The magnifying power of a compound microscope is:- a) Magnification of objective + Magnification of eye piece b) Magnification of objective/Magnification of eye piece c) Magnification of objective x Magnification of eye piece d) Magnification of objective - Magnification of eye piece

14. where should an object be placed in 32; front of a convex lens of focal length 10 cm as to get its real image magnified twice: a) 10 cm b) 20 cm c) 15 cm d) 30 cm

15. In astronomical telescope the image formed by eye piece is:- a) Neither real nor virtual b) Virtual c) None of these d) Real

16. The pupil of the eye controls: a) The focal length of eye b) Retina of eye c) The amount of light reaching to the eye d) None of above

17. An image formed by a concave lens is always:- a) real b) none of the above c) inverted d) virtual

18. Critical angle of a medium depends upon the:- a) Relative refractive index of the two medium b) Refractive index of the denser medium c) Speed of light in air d) Intensity of the beam of light

19. The light from reaches us before sunrise and persists for some times even after the sunset due to: a) Weather b) Transistor c) Irregular reflection of light d) Optical fiber

20. If an object is placed at center of curvature of a concave mirror then its image will form: a) At center of curvature b) At focal length c) Behind the mirror d) Behind the center of curvature

21. Lens is a: a) Transparent medium b) Reflecting medium c) Clean medium d) Invisible medium

22. All the rays parallel to the principal axis after reflection from concave mirror converge to a point which 32; is called as: a) Pole b) Principal focus c) Aperture d) Axis

23. A convex lens which is placed very close to human eye can be used as: a) Simple microscope b) Complex microscope c) Simple binocular d) Compound microscope

24. if q = 4 cm and p = 2 cm, then the magnification will be: a) 2 times b) 0.5 times c) 4 times d) 0.25 times

25. The center of spherical mirror is called as: a) Focus b) Center c) Pole d) Center of curvature

26. Convex mirror is used as: a) Converging mirror b) Diverging mirror c) Plane mirror d) Lens

27. The unit of power of Lens is: a) Diopter b) Centimeter c) Meter d) Mm

28. The ratio of sine of angle of incidence to the sine of angle of refraction is called as: a) Snell's Law b) Refractive Index c) Law of refraction d) All are correct

29. Total internal reflection occurs when angle of incidence is greater than: a) Optical measurement b) Final angle c) The Critical angle d) At Least distance of distinct vision

30. The refractive index of glass is: a) 2.5 b) 1.33 c) 1.0 d) 1.5

31. The ratio of size of image to the size of object is called as: a) p / q b) Magnification c) Optical length d) Least distance

32. Calculate speed of light in ; glycerin if its index of ; refraction is 1.47 a) 2.04 X 108 m/sec b) 300 m / sec c) 4 X 102 m/sec d) 1.33

33. A virtual image is formed by a convex lens, when the object is placed within the a) Focal point b) Optical length c) Focal length d) Optical focus

34. The speed of light in water is 2.25 X 105 km/sec, the index of refraction of water will be: a) 1.33 b) 1.5 c) 1.08 d) 2.5

35. An optical device used for viewing distant object is called a) Binocular b) Telescope c) Microscope d) Magnifying glass

36. Light travels from air to water whose index is 1.33. 32; If the angle of incidence is 40° , then the angle of refraction will be: a) 28.90° b) 45° c) 90° d) 180°

37. The ; distance between an object and the screen is 49 cm . what will be the focal length of a convex lens which has magnification 6 times and forms real image: a) 49 cm b) 30 cm c) 6 cm d) 20 cm

38. The focal length of a convex lens is one meter and an object is placed at a distance of 2 m from it. The nature of the image formed will be: a) Virtual b) Real c) Erect d) Double the size of object

39. The capacity of a ; fiber optic to carry tremendous information is called a) Wave length b) Frequency band c) Frequency Width d) Band width

40. If the radius of curvature of a spherical mirror is 24 cm the focal length will be: a) 24 cm b) 30 cm c) 12 cm d) 16 cm

41. Short sightedness is also called as: a) Hpermetropia b) Myopia c) Accommodation d) Least distance

42. In human eye the screen where the image of an object is formed is called as: a) Retina b) Lens c) Eye ball d) Optic nerve

43. Soap film in sunlight appears 32; colored due to? a) Diffraction of light b) Dispersion of light c) Scattering of light d) Interference of light

44. A thin layer of oil on the surface of water looks ; colored due to: a) Different elements present in the oil b) Interference of light c) The transmission of light d) Polarization of light

45. The bending of a beam of light when it passes from one medium to another is known as: a) Reflection b) Diffraction c) Dispersion d) Refraction

46. Electromagnetic waves are produced by: a) Accelerated charges b) Changes at rest or in uniform motion c) Heating a conductor d) Accelerated bodies

47. In head lights of an automobile 32; which mirror is used to converge light rays: a) A convex mirror b) A concave mirror c) A convex lens d) A concave mirror in front of the head light

48. A lens which is thinner at the centre and thicker at the edges is called: a) Plano-convex lens b) Concave lens or diverging lens c) Convex lens or converging lens d) Concave-convex lens

49. A lens which diverges a beam of parallel rays is called: a) Diverging lens or Concave lens b) Plano-convex lens c) Plane lens d) Convexo-concave lens

50. In Galileo's telescope, eye-piece is a: a) concave lens b) converging lens c) Convex lens d) Plano-concave lens

51. The 32; distance of an object from the pole of a spherical mirror is called: a) Image distance b) Object distance c) Focal length d) Radius of curvature

52. The ability of human eye to focus near as well as distant objects is called: a) Hypermetropia b) Myopia c) Power of accommodation d) Astigmatism

53. A man is standing at a distance of 10 m from a plane mirror. The distance between his image and himself will be: a) 30 m b) 10 m c) 20 m d) 15 m

54. Myopia (Short-Sightedness) can be cured by using: a) Cylindrical lens b) Concave lens c) Bifocal lens d) Convex lens

55. A lens which is thicker in the middle and thinner at the edges is called: a) Convex lens b) Concave lens c) Plano-concave lens d) Convexo-concave lens

56. A lens which is thinner in the middle and thicker at the edges is called: a) Concavo-convex b) Concave lens c) Convex lens d) Plano-convex lens

57. The distance between the focus and the optical centre of the lens is called: a) Focal length b) Radius of curvature c) Principal axis d) Diameter of lens

58. Kitab - Ul - Manazir was written by: a) Yaqub Kindi b) Ibn - al - Haithm c) Musa Tusi d) Al- Beruni

59. The point at which the incident ray of light and reflected ray of light meet together is called: a) Point of Incidence b) Point c) Pole d) Principal Focus

60. In refraction of light the angle of Incidence: a) is equal to angle of refraction b) is not equal to angle of refraction c) is always perpendicular to refractive medium d) is always parallel to the refractive surface

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