1. When you stand in water up to your knees, your feet appear:
a) Closer than usual b) Further away than usual
c) At the same location as usual d) To answer this you must known your height and the depth of water
A
2. When light passes from air to glass, it:
a) Bends towards the normal without changing speed b) Bends towards the normal and slows down c) Bends towards the normal and speeds up d) Bends away from the normal and slows down
B
3. The refractive index is:
a) Directly proportional to the wavelength of light b) Inversely proportional to the wavelength of light
c) Directly proportional to the square of the wavelength of light d) Inversely proportional to the square of the wavelength of light
B
4. A red cloth will primarily:
a) Reflect red light b) Refract red light c) Absorb red light d) Transmit red light
A 5. When light passed in to rarer medium the speed and wavelength changes, which of the following
statements is correct:
a) Speed increases b) Speed decreases
c) Speed increases, wavelength decreases d) Speed and wavelength both increase
D
6. When light enters from a rarer to a denser medium its:
a) Velocity increases b) Wavelength increases c) Its velocity remains same d) Its frequency remains same
D 7. Light from the sun reaches us in nearly:
a) 8 min. b) 16 min.
c) 8 sec. d) 16 sec.
A 8. A lens that is thicker at the edge than it is in the middle is:
a) Converging lens b) Diverging lens c) Angular lens d) Plain lens
B 9. The sign convention for virtual images is:
a) Positive b) Negative
c) Sometimes positive and sometimes negative d) All of the above
B 10. The angle of incidence for which angle of refraction is 90o, known as:
a) Glancing angle b) Critical angle c) Angle of prism d) None of these
B 11. Which of the following is true for refraction, when light passes from one medium to other:
a) It bends away from normal b) It bends towards the normal c) Either a) or b) d) None these
C 12. When white light is dispersed by a prism, one can see a series of colours. Which group of colours
mentioned below is out of order:
a) Red, Yellow, Green, Blue b) Red, Yellow, Violet, Blue c) Red, Orange, Green, Blue d) Orange, Green, Blue, Violet
B
13. “Mirage” is based on the phenomenon of:
a) Reflection b) Diffraction
c) Refraction d) Total internal Reflection
D 15. The angle of deviation for a prism is least for:
a) Violet b) Red
c) Orange d) Yellow
B 16. An optical fiber transmits bright light because:
a) The inside of pipe is polished
b) Of multiple reflection independent of reflection laws
c) Total internal reflection take place d) Light behaves as particles inside it
C
17. White light passing through a glass prism is separated with its component frequencies. This phenomenon is called:
a) Diffraction b) Dispersion c) Reflection d) Polarization
B
18. Physical optics and geometrical optics are:
a) Different methods of explaining light phenomenon
b) Two topics divided on the basis of the size of object concerned c) Based on atomic and molecular vibrations
d) Based on light wavelength of object size relationship
20. In visible region focal length of a lens is maximum for:
a) Red light b) Violet light
c) Yellow light d) White light
A 21. In a convex lens when the object lies at infinity, the image formed is:
a) Real b) Inverted
c) Extremely small in size d) All of these
D 22. An object is placed 50 cm apart from a converging lens of focal length 30 cm. The image produced
will be:
a) Inverted and of the same size b) Inverted and diminished c) Erect and diminished d) Inverted and magnified
D
23. When object placed beyond twice focal length of a convex lens, the characteristics of the image produced is:
a) Real, erect, diminished b) Virtual erect, magnified c) Real, inverted, diminished d) Real, erect, magnified
C
24. Image formed by a concave lens is:
a) Real, inverted, magnified b) Virtual, erect, magnified c) Virtual, erect, diminished d) Real, erect, diminished
C 25. Two convex lenses of same focal length ‘F’ are placed in contact. The focal length of this lens
combination is:
a) F b) 2F
c) F/2 d) F/4
C
26. Incident rays of light parallel to the principle axis of a convex lens, after refraction by the lens, will: a) Converge at the principle focus b) Converge inside the principle focus c) Converge outside the principle focus d) Converge at the centre of the curvature
A 27. A convex lens made up of glass is placed in water, its power in water as compared to air will:
a) Be unchanged b) Reduce in bad light and increase
c) Increase d) Decrease
D 28. If an object is placed slightly more than 2F from the convex lens image is located behind the lens:
a) Between optical centre & focus b) At focus c) Between focus & 2F d) Beyond 2F
C 29. Power of lens is equal to:
a) Focal length in meters b) Reciprocal of focal length expressed in meters
c) Double of focal length d) Half of focal length
B
30. A straight line passing through centers of curvature of the two spherical surfaces of a lens is called: a) Diameter of the lens b) Radius of the lens
c) Principle axis d) Principle focus
C 31. The power of converging lens is:
a) Positive b) Negative
c) Neutral d) None these
A 32. The focal length of a lens depends upon:
a) The radius of curvature of its surface b) The material of the lens c) The refractive index of the medium in which it is placed
d) All of these
D
33. Focal length of a lens in water is:
a) Increased b) Decreased
c) Remains same d) None of these
A 34. Real images formed by single convex lens are always:
a) On the same side of the lens as the object b) Inverted
c) Erect d) Smaller than the object
B 35. A terrestrial telescope can be made by adding an erecting lens to a:
a) Prism spectroscope b) Reflecting telescope c) Field telescope d) Astronomical telescope
D 36. The characteristics of an intermediate image formed in a compound microscope is:
a) Virtual, inverted, magnified b) Real, inverted, diminished c) Real, inverted, magnified d) Virtual, erect, magnified
A 37. In an astronomical telescope objective is a:
a) Concave lens of large focal length b) Convex lens of large focal length c) Concave lens of small focal length d) Convex lens of small focal length
B 38. Of the following lenses, the one that differ from all of the others is:
a) A simple magnifier b) A refracting telescope eye piece c) A microscope objective d) A refracting telescope objective
39. The length of a simple astronomical telescope is:
a) The difference of the focal length of two lenses b) The sum of the focal length of two lenses c) Half the sum of the focal length d) Equal to the focal length of the ob. lens
B 40. A Galilean telescope consist of:
a) A converging objective and a converging eye-piece b) A converging objective and a diverging eye-piece c) A diverging objective and a diverging eye-piece d) A diverging objective and a converging eye-piece
B
41. The erecting lens in terrestrial telescope:
a) Increases its magnification b) Decreases its magnification c) Has no effect on magnification d) None of these
C 42. The magnifying power of a compound microscope is given by [Where f1 = focal length of objective
f2 = focal length of eye piece]:
a) M = L/f1 (d/f2 + 1) b) M = Lf1 (d/f2 + 1)
c) Both have the same meaning d) None of these
A
44. How can the spherical aberration be corrected:
a) By using a Plano-convex lens b) By using a cylindrical lens c) By using a thin lens d) None of these
D 45. A body who cannot see distant object is said to have a defect called:
a) Astigmatism b) Cataract of the eye c) Hyper metropia d) Myopia
D 47. The human eye refocuses by altering:
a) The length of the eyeball b) The shape of the crystalline lens c) The refractive indices of the liquids in the eye d) The aperture
B 48. When the relaxed eye produces an image of a distant objected behind the retina, this abnormality is
known as:
a) Shortsightedness b) Hyper-myopia c) Myopia d) None of these
C
49. The final image of astronomical telescope is:
a) Real, erect, enlarged b) Virtual, erect, enlarged c) Real, inverted, enlarged d) Virtual, inverted, enlarged
D 50. _______ is an eye defect in which a person can not see the near object, because the distance between
eye and its retina is too short:
a) Shortsightedness b) Long sightedness c) Spherical aberration d) Chromatic aberration
B
51. The refraction of different wavelength of light at different angles through a convex lens, produce a defect called:
a) Astigmatism b) Chromatic aberration c) Spherical aberration d) Short sightedness
B
52. In a compound microscope, the lenses used are:
a) Objective of small focal length and eye-piece of large focal length b) Objective of small focal length and eye-piece of small focal length c) Objective of large focal length and eye-piece of small focal length d) Objective of large focal length and eye-piece of large focal length
A
53. Chromatic aberration can be removed by combining: a) A convex lens and a concave lens of same type of glass b) Two convex lenses of different types of glass
c) Two concave lenses of different types of glass
d) A concave lens of one type of glass and a convex lens of another type of glass
D
54. Long sightedness can be cured by:
a) Convex lens b) Concave lens c) Cylindrical lens d) Bifocal lens
A 55. Which of the following sources gives discrete emission spectrum:
a) Incandescent electric bulb b) Sun c) Mercury vapor lamp d) Candle
C 56. If an emission line spectrum, the region recorded is:
a) Dark lines b) Bright lines c) Dark spots d) None of these
B 59. Line spectrum is obtained when substances are excited in there:
a) Atomic state b) Molecular state c) Gaseous state d) None of these
60. Line spectrum contain a series of:
a) Dark spot in the visible region of spectrum b) Bright spot in a visible region of spectrum c) Lines in the visible region of spectrum d) Points in the visible region of spectrum
C 61. Line spectrum is emitted by:
a) A candle flame b) The sun c) Incandescent lamp d) Mercury vapour
D 62. Emission spectrum is of:
a) Only one type b) Two types c) Three types d) None of these
C 63. The fact that energy point on any advancing wave front may be considered as a source of secondary
waves which move forward spherical wavelets is a principle attributed to:
a) Faraday b) Michelson
c) Huygen d) Galileo
C
64. The speed of light in diamond is 1.4 108 m/s and that in air is 3 108 m/s. The index of refraction
of diamond is approximately:
a) 1 b) 1.33
c) 2.24 d) 4
C
65. The speed of light in certain transparent is two-fifth of its speed in air. The index of refraction of this substance is:
a) 0.4 b) 1.4
c) 2.0 d) 2.5
D
66. Photograph of a tree is taken with a pinhole camera. The tree is 60 cm from the camera and its image is 40 cm from the hole. The image of the tree is 10 cm long. Find the actual length of tree:
a) 40 cm b) 60 cm
c) 80 cm d) 15 cm
D
67. A tank of water is 4 meters deep. How deep does it appear when looking vertically downwards: (Refractive index of water is 4/3)
a) 3 centimeters b) 3 meters
c) 4 meters d) 40 meters
B
68. The magnification power of the astronomical telescope with the objective of power 0.02 dioptre and eye-piece of power 0.2 dioptre is:
a) 10 b) 100
c) 1000 d) 10000
A
69. One dioptre is the power of that lens which has a focal length of _______:
a) 1 mm b) 1 cm
c) 1 m d) 1 m
D 70. The magnification of an astronomical telescope with objective of focal length 200 cm and an eye- piece of focal length 20 cm is:
a) 10 b) 100
c) 20 d) 50
A
71. If a lens power of 3 dioptre is combined with a lens of power -4 dioptre. The combination will be: a) Converging lens of focal length 1 m b) Converging lens of focal length 5 m c) Diverging lens of focal length 1 m d) Diverging lens of focal length 5 m
C 72. A beam of light is suffered total internal reflection after entering a glass prism with refractive index
1.5, the critical angle of the prism is:
a) 30o b) 42o
c) 24o d) 46o
B
73. An astronomical telescope has an object lens of focal length 20 m and power full eye-piece of focal length of about 6.5 mm, it can magnify a distant star almost:
a) 2000 times b) 3000 times
c) 2500 times d) 5000 times
B
74. A camera of focal length 6 inch is used to photograph a distance scene. The distance from the lens to the image is approximately:
a) 0.5 inch b) 0.5 ft
c) 12 inch d) 2 ft
B
75. When a lens of magnification 3 is inserted b/w an object and a screen at fixed distance apart. If the size of the image obtained is 6 cm. The size of the object is:
a) 2 cm b) 4 cm
c) 4.5 cm d) 9 cm
A
76. A parallel beam of light entered from air to glass at 30o with the normal. If the refractive index of glass is
1.53, the angle of emergence of the light beam is:
a) 60o b) 30o
77. A converging lens of focal length 50 mm is to be used as a magnifying glass for inspecting stamp. A rectangular stamp, which is 20 mm 40 mm, is placed 30 mm from the lens, find the length of the image of the 20 mm side of the stamp:
a) 50 mm b) 60 mm
c) 85 mm d) 20 mm
A
78. An object 1.5 cm high is placed 18.0 cm from the centre of a converging lens of focal length 10.0 cm. One end of the object is on the principle axis of the lens, determine image distance from the lens:
a) 33.6 m b) 22.5 m
c) 12.0 m d) 22.9 m
B
79. Dispersion of the light means:
a) Bending of the light b) To break the light into its component c) Spreading of the light d) To send light from one medium to other
B 80. The production of rainbow is due to:
a) Interference at the water drop and inside diffraction b) Refraction at the water drop and inside reflection c) Reflection at the water drop and inside
d) Diffraction at the water drop and inside reflection
B
81. The primary bow is the rainbow usually seen and is obtained by:
a) One refraction and one reflection b) Two refraction and two reflection c) Two refraction and one reflection d) One refraction and two reflection
C 82. Sometimes a secondary bow is formed due to:
a) One refraction and two reflection b) One refraction and one reflection c) Two refraction and two reflection d) Two refraction and one reflection
C 83. The range of visible wavelength is:
a) 1 mm to 40 mm b) 400 nm to 700 nm c) 1 nm to 40 nm d) 400 nm to 600 nm
B 84. The spectrum which can not be seen by naked eye is called:
a) Invisible spectrum b) Pure spectrum c) Visible spectrum d) Impure spectrum
A 85. White light is the normal mixture of all:
a) Invisible radiation b) Ultraviolet radiation c) Gamma radiation d) Visible radiation
D 86. There are three types of spectra, which are:
a) Line, circular & band spectra b) Line, Band & continuous spectra c) Ellipse, circular & line spectra d) Oval, circular & band spectra
B 87. The spectrometer consists of:
a) Microscope, prism b) Telescope
c) Collimator, telescope d) Microscope, telescope, prism
C 88. The spectrometer is used to study:
a) Nature of light b) Intensity of light c) Wavelength of light d) Polarization of light
C 89. Primary colours are:
a) Yellow, indigo, violet b) Red, green, blue c) Orange, green, blue d) Violet, green, blue
B 90. Radiation that is in the region of the infrared may be detected with the help of an instrument known
as:
a) Sonometer b) Avometer
c) Barometer d) Pyrometer
D
91. Infrared has wavelength longer then visible, its wavelength range is:
a) 0.7 m to about 0.8 m b) 0.7 m to about 1 mm c) 0.8 m to about 1 mm d) 0.3 m to about 0.7 m
B
92. Angle of deviation has the smallest value for:
a) Red light b) Violet light
c) Blue light d) Yellow light
A 93. A red object when seen through a thick blue glass appears:
a) Red b) Violet
c) Green d) Black
D 94. In a spectrometer a prism is used to:
a) Reflect the light b) Refract the light c) Transmit the light d) Disperse the light
95. Spectra which consists of sharp bright lines separated from the each other by regular or irregular distance known as:
a) Emission spectra b) Band spectra c) Line spectra d) Continuous spectra
C
96. Ultraviolet has wavelength shorter than visible, its wavelength range is: a) 1 nm to 100 nm b) 1 nm to 380 nm c) 1 nm to 400 nm d) 1 nm to 399 nm
C 97. The line spectrum of an element usually consists of:
a) A number of lines of different but definite wavelengths
b) Over crowded lines c) Impure spectrum d) One line which changes colour from time to time
A
98. Velocity of light in diamond is given by (diamond’s refractive index is 2.00): a) 1.5 108 m/s b) 2.5 108 m/s
c) 3.1 108 m/s d) None of these
A 99. The lens used for correcting the defect of eye astigmatism is:
a) Plane lens b) Convex lens
c) Concave lens d) Cylindrical lens
D 100. The power of a lens is measured in:
a) Angstrom b) Dioptres
c) Meter d) Centimeter
B 101. The lens which converge a beam of parallel rays are called:
a) Converging lens b) Diverging lens c) Concave lens d) Double concave lens
A 102. In which of the following cases total internal reflection can not be obtained:
a) A ray going from water to glass b) A ray going from glass to water c) A ray going from water to air d) None of these
A 103. The reciprocal of the focal length of lens, which expressed in dioptre, is called:
a) Radius of curvature of lens b) Centre of curvature of lens c) Aberration of lens d) Power of lens
D 104. The magnifying power of astronomical telescope is:
a) M = fe/f0 b) M = f0fe
c) M = f0/fe d) M = f02/fe
C 105. For concave lens:
a) Formed image is always virtual and diminished in size b) Formed image is always real and diminished in size
c) Formed image is virtual and up side down d) Formed image is real
A
106. Which lens is used to correct the defect of short sightedness:
a) Convex lens b) Concave lens c) Double concave lens d) Plano concave lens
B 107. The centre of Iris is called:
a) Pupil b) Lens
c) Aqueous humour d) Ciliary muscle
A 108. Least distance of vision for a normal eye is about:
a) 20 cm b) 25 cm
c) 30 cm d) 17 cm
B 109. Light emitted from the sun takes approximately to reach the earth:
a) 10 seconds b) 50 seconds
c) 100 seconds d) 500 seconds
