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I have created this blog for students of class 10 of Gujarat secondary Education Board (GSEB). Questions are based on the text book of Gujarat Board. Hope it will help other students, too. For descriptive Question-Answer you can visit my another blog scienceandtechnology-manojsir.blogspot.com

Thursday, March 6, 2014

Chapter 1 : INTRODUCTION TO NANOTECHNOLOGY

Choose Appropriate Alternative



  1. 10 nm = _____ m
    [A] 10-8 [B] 10-7 [C] 10-9 [D] 10-10
  2. The size of nanoparticles is between _____ nm.
    [A] 100 to 1000 [B] 0.1 to 10 [C] 1 to 100 [D] 0.01 to 1
  3. The diameter of hydrogen atom is...
    [A] 1 [B] 10 [C] 0.1 [D] 0.01
  4. Carbon atoms make ____ type of bond with other carbon atoms.
    [A] covalent [B] ionic [C] metallic [D] hydrogen
  5. Fullerene or bucky ball is made up of ____ carbon atoms.
    [A] 100 [B] 20 [C] 75 [D] 60
  6. The thermal conductivity of a standard SWNT along its length is ____ watt/(m.K)
    [A] 3500 [B] 385 [C] 35000 [D] 35
  7. 1 m = _____ nm.
    [A] 10-9 [B] 10-8 [C] 109 [D] 108
  8. "There is plenty of room at the bottom." This was stated by _____.
    [A] Eric Drexler [B] Richard Feynmann [C] Harold Croto [D] Richard Smalley
  9. Who coined the word 'nanotechnology'?
    [A] Eric Drexler [B] Richard Feynmann [C] Sumio Tijima [D] Richard Smalley
  10. According to the definition by CRN, nanotechnology is...
    [A] mechanical engineering [B] atomic engineering 
[C] Newtonian mechanics    [D] micro-electronics
  11. Nanoscience can be studied with the help of...
    [A] quantum mechanics [B] Newtonian mechanics [C] macro-dynamics [D] geophysics
  12. Greeks and Romans had used nanoparticles in the manufacture of...
    [A] cosmetics for eyes [B] medicines [C] metal articles [D] hair-dye
  13. Egyptians were using ____ to prepare make-up for eyes.
    [A] nanoaluminium [B] nanocopper [C] nanosteel [D] nanolead
  14. The sword of Tipu Sultan was made of...
    [A] nanolead [B] nanoaluminium [C] Damascus steel [D] Pure iron
  15. _____ contains nanoparticles prepared by using biologically processed metal ores.
    [A] Homeopathic medicines [B] Modern antibiotics 
[C] Ayurvedic 'Bhasmas'  [D] Modern cosmetics
  16. Who was the first scientist to describe that substances having nanodimensions possess altogether different and unique properties?
    [A] Richard Feynmann [B] Eric Drexler [C] Archimedes [D] Michael Faraday
  17. Which of the following does not apply to nanotechnology?
    [A] It is a general-purpose technology.  [B] It can be called Green technology.
[C] Newtonian mechanics can describe it. [D] It involves rearrangement of atoms.
  18. The diameter of human hair is ____ nm.
    [A] 50,000 [B] 75,000 [C] 90,000 [D] 1,00,000
  19. The diameter of human hair is ____ m.
    [A] 5 x 10-8 [B] 5 x 10-7 [C] 5 x 10-6 [D] 5 x 10-5
  20. The cut-off limit of human eye is ____ nm.
    [A] 2,000 [B] 5,000 [C] 10,000 [D] 50,000
  21. The size of E.Coli bacteria is ____ nm.
    [A] 2,000 [B] 5,000 [C] 50 [D] 90
  22. The size of RBC is ____ nm.
    [A] 50 [B] 90 [C] 2,000 [D] 5,000
  23. The thickness of a transistor is ____ nm.
    [A] 50 [B] 90 [C] 2,000 [D] 5,000
  24. The size of a virus is ____ nm.
    [A] 2 [B] 20 [C] 50 [D] 2000
  25. The diameter of a bucky ball is ____ nm.
    [A] 1,000 [B] 100 [C] 10 [D] 1
  26. The width of a typical DNA molecule is ____ nm.
    [A] 1 [B] 2 [C] 5 [D] 10
  27. 1 micrometer (micron) = ______ m.
    [A] 10-9 [B] 10-8 [C] 10-7 [D] 10-6
  28. 1 micrometer (micron) = ______ nm.
    [A] 1,000 [B] 100 [C] 10 [D] 0.01
  29. The full form of STM is...
    [A] Scanning Tunneling Microscope   [B] Scientific Technical Microscope 
[C] Systematic Technical Microscope[D] Super Tensile Microscope
  30. What does 'F' stand for in AFM?
    [A] Fine [B] Front [C] Force [D] Flux
  31. Which ratio decides the efficiency of nanosubstances?
    [A] Weight/volume [B] Surface area/volume [C] Volume/weight [D] Pressure/volume
  32. The surface area to volume ratio of a sphere with radius 1 cm is R1 and that of a sphere with radius 5 cm is R2. Then R1 = ____ R2.
    [A] 3 [B] 1/3 [C] 5 [D] 1/5
  33. The surface area to volume ratio of a cube with side 1 unit is R1 and that of a cube with side 10 units is R2. Then R2 = ____ R1.
    [A] 1/10 [B] 10 [C] 1/100 [D] 100
  34. The two important properties of nanosubstances are...
    [A] pressure and friction     [B] sticking and friction 
[C] sticking and temperature [D] temperature and friction
  35. With the help of _____, Robert F. Curl and others discovered fullerene.
    [A] electron microscope     [B] magnetic resonance 
[C] condensation technique [D] mass spectrograph
  36. In the structure of fullerene each carbon atom forms covalent bonds with ____ other carbon atoms.
    [A] one [B] two [C] three [D] four
  37. Who had invented the famous 'Geodesic' dome structure?
    [A] Eric Drexler [B] Buckminster Fuller [C] Richard Smalley [D] Faraday
  38. The largest cluster of carbon atoms in Bucky balls known till today consists of ____ carbon atoms.
    [A] 60 [B] 75 [C] 180 [D] 540
  39. The smallest cluster of carbon atoms in Bucky balls known till today consists of ____ carbon atoms.
    [A] 75 [B] 60 [C] 20 [D] 15
  40. The tensile strength of an MWNT is ____ Pa.
    [A] 63 x 106 [B] 63 x 107 [C] 63 x 108 [D] 63 x 109
  41. The compressive strength of a nanotube _____ its tensile strength.
    [A] is less than [B] is greater than [C] is equal to [D] may be greater than
  42. The hardness of a standard SWNT is ____ Pa.
    [A] 63 x 106 [B] 25 x 106 [C] 25 x 109 [D] 25 x 10-9
  43. The bulk modulus of a standard SWNT is ____ that of diamond.
    [A] less than [B] greater than [C] equal to [D] less than or equal to
  44. How much current can be passed through 1 cm2 cross-section of a metal nanotube?
    [A] 10-9 A [B] 109 A [C] 1000 A [D] 0.001 A
  45. The electrical conductivity of a nanotube is ____ times that of copper.
    [A] 10 [B] 100 [C] 1000 [D] 1/100
  46. An MWNT possesses electrical superconductivity up to temperature of...
    [A] 12 K [B] 12°C [C] 100 K [D] 100°
  47. At room temperature, the thermal conductivity of a copper wire is ____ watt/(m.K).
    [A] 3500 [B] 350 [C] 385 [D] 38.5
  48. In radial direction, the thermal conductivity of a nanotube is ____ watt/(m.K).
    [A] 3500 [B] 385 [C] 350 [D] 0
  49. The thermal stability of a nanotube is seen up to ____ K in vacuum.
    [A] 100 [B] 1000 [C] 2200 [D] 3100
  50. The thermal conductivity of an SWNT along length is ____ watt/(m.K).
    [A] 35 [B] 350 [C] 385 [D] 3500
  51. The size of a quantum dot is ____ nm.
    [A] 5 [B] 10 [C] 50 [D] 100
  52. The wavelength of visible light is ____ nm.
    [A] 40-70 [B]  400-700 [C] 4000-7000 [D] 40000-70000
  53. The capacity of a normal human eye to see the smallest object is ____ μm.
    [A] 10000 [B] 1000 [C] 100 [D] 10
  54. The width of a carbon nanotube is ____ nm.
    [A] 1 [B] 1.3 [C] 2.5 [D] 10
  55. The thermal stability of a nanotube is seen up to ____ K in air.
    [A] 100 [B] 1000 [C] 2000 [D] 3100
  56. Nanoparticles of which substance were found on the surface of the sword of Tipu Sultan?
    [A] Gold [B] Lead [C] Carbon [D] Silicon
  57. Nano particles of which atom are used to control collateral damage due to explosion?
    [A] Copper [B] Aluminium [C] Carbon [D] Lead
  58. Who prepared and explained nanotubes for the first time?
    [A] Sumio Tijima [B] Richard Smalley [C] Eric Drexler [D] Richard Feynmann
  59. Which of the following statement/s is are true?
    1. Volume to surface area ratio is very large for nanomaterials.
    2. The cut-off limit of human eye is 10-5 m.
    3. Hardness of a SWNT is about 63 x 109 Pa.
    4. Carbon nanotubes are cylindrical fullerenes. 

    [A] All four [B] (ii) and (iv) [C] (i), (ii) and (iv) [D] (ii), (iii) and (iv)
  60. Match the objects in Part A with their size in Part B.

    [A] 1-a, 2-c, 3-d, 4-b [B] 1-b, 2-a, 3-c, 4-d
[C] 1-a, 2-d, 3-b, 4-c [D] 1-c, 2-d, 3-b, 4-a
  61. Match the items in Part A with appropriate alternative in Part B. 

    [A] 1-c, 2-d, 3-a [B] 1-c, 2-b, 3-a [C] 1-c, 2-a, 3-b [D] 1-a, 2-b, 3-d
  62. The suffix '-ene' in the name of fullerene shows the presence of _____ in the molecule.
    [A] one triple bond [B] one double bond [C] two single bonds [D] two triple bonds

ANSWERS


(1) A (2) C (3) C (4) A (5) D (6) A (7) C (8) B (9) A (10) B (11) A (12) D (13) D (14) C (15) C (16) D (17) C (18) A (19) D (20) C (21) A (22) D (23) B (24) C (25) D (26) B (27) D (28) A (29) A (30) C (31) B (32) C (33) A (34) B (35) D (36) C (37) B (38) D (39) C (40) D (41) A (42) C (43) B (44) B (45) C (46) A (47) C (48) D (49) D (50) D (51) A (52) B (53) D (54) B (55) B (56) C (57) B (58) A (59) D (60) C (61) C (62) B
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Saturday, March 1, 2014

Chapter 2 : LIGHT : REFLECTION AND REFRACTION

Choose Appropriate Alternative


  1. What is the range of wavelength of visible light?
    [A] 4 x 10-7 to 8 x 10-7 m [B] 4 x 10-9 to 8 x 10-9 m 
[C] 4 x 10-5 to 8 x 10-5 m [D] 4 x 10-6 to 8 x 10-6 m
  2. For the spherical mirror, what is the relation between radius of curvature (R) and focal length (f)?
    [A] R = f/2 [B] R = f [C] R = 2f [D] R = 3f
  3. Which type of reflection is represented by the light reflected from a book?
    [A] Regular [B] Irregular [C] Both types [D] None
  4. Through which point, a ray passing through the centre of curvature and reflected by a concave mirror will pass through?
    [A] Focus [B] Centre of curvature [C] Pole [D] All
  5. At what distance in front of a concave mirror should an object be placed to get its virtual and erect image?
    [A] At the centre of curvature [B] Beyond the centre of curvature
[C] Between focus and pole     [D] At focus
  6. For a plane mirror, the magnification is always...
    [A] > 1 [B] < 1 [C] 1 [D] 0
  7. The focal length of a plane mirror is...
    [A] zero [B] infinite [C] uncertain [D] equal to the object distance
  8. The distance between the object at 2 m from a plane mirror and its image is...
    [A] 4 m [B] 1 m [C] 2 m [D] 3 m
  9. At what distance should an object be placed to obtain its real, inverted and same-sized image by a convex lens?
    [A] At focus               [B] Between focus and centre of curvature
[C] At centre of curvature [D] Between optical centre and focus
  10. Which of the following materials has maximum optical density?
    [A] Glass [B] Water [C] Pearl [D] Diamond
  11. The absolute refractive index of any medium is always...
    [A] 1 [B] > 1 [C] < 1 [D] zero
  12. Which of the lenses with focal length 10 cm, 20 cm, 25 cm and 50 cm has maximum power?
    [A] 50 cm [B] 25 cm [C] 20 cm [D] 10 cm
  13. What is the focal length of a convex lens having power +5.0?
    [A] -10 cm [B] -20 cm [C] +10 cm [D] + 20 cm
  14. If the absolute refractive indices of water, benzene and sapphire are 1.33, 1.50 and 1.77, respectively, then which medium has maximum relative refractive index?
    [A] Sapphire relative to water [B] Sapphire relative to benzene 
[C] Benzene relative to water  [D] Water relative to benzene
  15. Which type of image is formed by a plane mirror?
    [A] Real, inverted [B] Real, erect [C] Virtual, erect [D] Virtual, inverted
  16. If the absolute refractive indices of water and glass are 4/3 and 3/2, respectively, then what will be the ratio of velocity of light in water to that in glass?
    [A] 2 [B] 8/9 [C] 9/8 [D] 1/2
  17. If the absolute refractive indices of water, glass and diamond are 1.33, 1.50 and 2.42, respectively, then which medium is optically densest?
    [A] Water [B] Glass [C] Diamond [D] None
  18. Which of the following always form virtual image?
    [A] Concave mirror and convex lens [B] Convex mirror and concave lens
[C] Convex mirror and convex lens [D] Concave mirror and concave lens
  19. What will be the angle of refraction for a light ray incident normal to the surface?
    [A] 90 [B] 60 [C] 30 [D] 0
  20. A compound microscope consists of two convex lenses of focal length 5 cm and 20 cm. Which of them will be objective lens and eye piece?
    [A] Objective lens - f = 20 cm, eye piece - f = 5 cm
[B] Objective lens - f = 5 cm, eye piece - f = 20 cm 
[C] Objective lens - f = 20 cm, eye piece - f = 20 cm 
[D] Objective lens - f = 5 cm, eye piece - f = 5 cm
  21. The speed of light in vacuum is ____ m/s.
    [A] 3 x 105 [B] 3 x 106 [C] 3 x 107 [D] 3 x 108
  22. Which of the following is not true for light rays?
    [A] They travel in straight line. [B] They do not need a medium for propagation.
[C] They are mechanical waves.   [D] They create sensation in our eyes.
  23. We can see objects clearly due to _____ of light.
    [A] refraction [B] regular reflection [C] irregular reflection [D] diffraction
  24. If a ray of light is incident on a surface makes an angle of measure 40° with the surface, then its angle of reflection is of measure...
    [A] 40° [B] 50° [C] 80° [D] 20°
  25. If the angle of incidence of a ray of light is 40°, the measure of the angle between the incident ray and the reflected ray is...
    [A] 40° [B] 50° [C] 80° [D] 20°
  26. The image formed by a plane mirror is...
    [A] real [B] real and erect [C] real and of same size [D] laterally inverted
  27. If the distance between Paresh and his image formed by a plane mirror is 3 m, then the distance between Paresh and the mirror is...
    [A] 1.5 m [B] 3 m [C] 6 m [D] 1/3 m
  28. The centre of the reflecting surface of a spherical mirror is called its...
    [A] pole [B] focus [C] aperture [D] centre of curvature
  29. If a ray of light incident on a concave mirror is parallel to the principal axis, then after reflection it will...
    [A] travel parallel to the principal axis [B] pass through the focus
[C] pass through the centre of curvature [D] pass through the pole
  30. If a ray of light incident on a concave mirror passes through C, then after reflection it will...
    [A] pass through F        [B] pass through the pole 
[C] pass through C again [D] become parallel to the principal axis
  31. If an object is placed at infinite distance in front of a concave mirror, its image is formed...
    [A] at infinite distance [B] at F [C] at C [D] between F and C
  32. If an object is placed at a finite distance beyond C in front of a concave mirror, its image is formed...
    [A] at C [B] between F and C [C] at F [D] between F and pole
  33. If an object is placed at a finite distance beyond C in front of a concave mirror, its image is...
    [A] real and enlarged       [B] real and of the same height as the object
[C] virtual and diminished  [D] real and diminished
  34. If an object is placed at C in front of a concave mirror, its image is formed...
    [A] at F [B] between F and C [C] at C [D] beyond C
  35. If an object is placed at C in front of a concave mirror, its image is...
    [A] real and of the same height as the object [B] real and diminished 
[C] real and enlarged                         [D] virtual and enlarged
  36. If an object is placed between C and F in front of a concave mirror, its image is formed...
    [A] beyond C [B] between C and F [C] at C [D] at F
  37. If an object is placed between C and F in front of a concave mirror, its image is...
    [A] real and diminished    [B] real and enlarged 
[C] virtual and diminished [D] virtual and enlarged
  38. If an object is placed at F in front of a concave mirror, its image is formed...
    [A] at F [B] at C [C] between F and C [D] at infinite distance
  39. If an object is placed between F and pole of a concave mirror, its image is formed...
    [A] beyond C [B] at infinity [C] between F and C [D] behind the mirror
  40. If an object is placed between F and pole of a concave mirror, its image is...
    [A] real  and enlarged        [B] virtual and enlarged 
[C] real and diminished [D] virtual and diminished
  41. The image formed by a convex mirror is always...
    [A] real and enlarged     [B] real and diminished
[C] virtual and enlarged [D] virtual and diminished
  42. If an object is placed at a finite distance from a convex mirror, its image is formed...
    [A] beyond C         [B] between F and C 
[C] between F and P [D] anywhere depending on object distance
  43. If an object placed in front of a convex mirror is moved towards the mirror, its image will move...
    [A] away from P towards F [B] away from F towards P
[C] away from F towards C [D] beyond C
  44. In Cartesian sign convention for spherical mirrors, the origin is taken at...
    [A] pole of the mirror      [B] focus of the mirror 
[C] its centre of curvature[D] at the point where object is placed
  45. Using standard symbols, which of the following is mirror formula?
    [A] (1/v) - (1/u) = (1/f) [B] (1/v) + (1/f) = (1/u) 
[C] (u + v)/uv = (2/R)   [D] (u + v)/uv = (R/2)
  46. The magnification by a convex mirror is always...
    [A] 1 [B] less than 1 [C] greater than 1 [D] negative
  47. The magnification by a concave mirror is (-1) when the object is placed...
    [A] at F [B] between C and F [C] at C [D] beyond C
  48. If an object is placed between F and pole of a concave mirror, its magnification is...
    [A] > 1, positive [B] > 1, negative [C] < 1, positive [D] < 1, negative
  49. If the image formed by a concave mirror is real and enlarged, its magnification can be...
    [A] + 0.5 [B] - 0.5 [C] + 5.0 [D] - 5.0
  50. During refraction of light through a rectangular glass slab, the lateral shift does not depend on...
    [A] angle of incidence                             [B] refractive index of the medium 
[C] perpendicular distance between refractive surfaces of the slab [D] thickness of slab
  51. If an object is placed beyond 2F1 of a convex lens, its image is formed...
    [A] beyond 2F2 [B] between F2 and 2F2 [C] at 2F2 [D] between F2 and O
  52. If an object is placed between F and 2F of a convex lens, its image is...
    [A] real, diminished [B] virtual, diminished [C] real, enlarged [D] virtual, enlarged
  53. If the image of an object formed by a convex lens is virtual, then...
    [A] the object is between F and 2F [B] the object is at 2F
[C] the image is diminished        [D] the image is enlarged
  54. The image of an object placed at a finite distance in front of a concave lens is...
    [A] always real [B] always virtual [C] always enlarged [D] always virtual and enlarged
  55. The magnification of a concave lens is always...
    [A] < 1, positive [B] < 1, negative [C] > 1, positive [D] > 1, negative
  56. The SI unit of power of lens is...
    [A] meter [B] dioptre [C] cm [D] hertz
  57. Which of the following cannot be the power of a convex lens?
    [A] 2.0 D [B] 0.5 D [C] 1.0 D [D] -0.75 D
  58. The power of a lens is + 2.5 D, then its focal length is_____ m.
    [A] 0.4 [B] 4.0 [C] 2.5 [D] 0.25
  59. The power of a concave lens with focal length 25 cm is...
    [A] -4.0 D [B] +4.0 D [C] -0.04 D [D] +0.04 D
  60. A simple microscope uses...
    [A] one concave lens [B] two concave lenses [C] one convex lens [D] two convex lenses
  61. A compound microscope consists of...
    [A] a convex lens and a concave lens [B] two concave lenses
[C] two convex lenses                [D] only one convex lens
  62. The image formed by a compound microscope is...
    [A] real and enlarged    [B] real and diminished
[C] virtual and enlarged [D] virtual and diminished
  63. The image formed by an astronomical telescope is...
    [A] real and enlarged    [B] real and diminished
[C] virtual and enlarged [D] virtual and diminished
  64. Which of the following can focus the rays of light?
    [A] Convex mirror [B] Concave lens [C] Convex lens [D] Plane mirror
  65. The rays of a parallel beam of light do not remain parallel after reflection from...
    [A] plane mirror [B] convex mirror [C] concave mirror [D] irregular reflecting surface
  66. If θi and θr denote angle of incidence and angle of reflection, respectively, then...
    [A] θi > θr [B] θi < θr [C] θi = θr [D] θr = 90°
  67. If θi and θr denote angle of incidence and angle of refraction, respectively, then...
    [A] θi > θr [B] θi < θr [C] θi = θr [D] θi ≠ θr
  68. The distance between the centre of curvature and the pole of a mirror is...
    [A] focal length [B] radius of curvature [C] object distance [D] image distance
  69. The distance between the principal focus and the centre of curvature of a mirror is equal to...
    [A] radius of curvature [B] focal length [C] aperture [D] distance between object and image
  70. Which of the following is not a part of a spherical mirror?
    [A] Pole [B] Centre of curvature [C] Curved surface [D] Aperture
  71. The distance between the principal focus and the pole of a mirror is half of the...
    [A] radius of curvature [B] focal length [C] aperture [D] distance between object and image
  72. A virtual and enlarged image is formed by a concave mirror when distance of the object is...
    [A] equal to focal length  [B] greater than focal length
[C] less than focal length [D] equal to radius of curvature
  73. Which of the following conditions is to be satisfied to obtain a magnified image of an object by a concave mirror?
    [A] v > u [B] v < u [C] v = u [D] v = f
  74. Which of the following conditions is to be satisfied to obtain a virtual image of an object by a concave mirror?
    [A] u > f [B] u < f [C] u = f [D] u = 2f
  75. According to Cartesian sign convention, ______ is always considered negative.
    [A] focal length [B] radius of curvature [C] object distance [D] image distance
  76. In which of the following pairs of mediums, light has almost same speed?
    [A] Air, water [B] Water, glass [C] Air, vacuum [D] Glass, diamond
  77. Which of the following may have magnification equal to -1?
    [A] Concave mirror, Convex lens  [B] Convex mirror, convex lens 
[C] Concave mirror, concave lens [D] Convex mirror, concave lens
  78. Which of the following may form a real, inverted and magnified image?
    [A] Concave mirror, Convex lens  [B] Convex mirror, convex lens 
[C] Concave mirror, concave lens [D] Convex mirror, concave lens
  79. When an object is placed at a distance of 12 cm from a concave mirror, its image is formed at a distance of 24 cm. What will be the magnification?
    [A] +0.5 [B] -0.5 [C] +2.0 [D] -2.0
  80. Which of the following may have magnification equal to +0.5?
    [A] Convex mirror [B] Concave mirror [C] Convex lens [D] Plane mirror
  81. Which of the following may have magnification equal to -0.5?
    [A] Convex mirror [B] Concave lens [C] Convex lens [D] Plane mirror
  82. Which of the following rectangular glass slabs made from same material produces the largest lateral shift when a ray of light is incident at the same angle?
    [A] 15 cm x 9 cm [B] 15 cm x 10 cm [C] 15 cm x 11 cm [D] 15 cm x 12 cm
  83. If the focal length of a lens is doubled, the power of lens...
    [A] is halved [B] is doubled [C] remains same [D] becomes four times
  84. What will be the distance between the principal focus and the centre of curvature of a convex lens having radius of curvature equal to 50 cm?
    [A]  20 cm [B] 25 cm [C] 50 cm [D] 100 cm
  85. What will be the distance between the principal focus and the centre of curvature of a convex lens having focal length equal to 50 cm?
    [A]  20 cm [B] 25 cm [C] 50 cm [D] 100 cm
  86. _____ converge parallel light rays incident upon them.
    [A] Concave mirror, Convex lens  [B] Convex mirror, convex lens 
[C] Concave mirror, concave lens [D] Convex mirror, concave lens
  87. Which of the following statement(s) is(are) not true?
    1. The speed of light in vacuum is 3 x 105 km/s.
    2. The real image is always inverted.
    3. Magnification of plane mirror is +1 or -1
    4. Image formed by a concave lens is always diminished and real.

    [A] (ii) [B] (iii) and (iv) [C] (ii) and (iv) [D] (i), (iii) and (iv)
  88. Absolute refractive index of a medium is always greater than 1 because...
    [A] Velocity of light in vacuum is greater than that in the medium.
[B] Velocity of light in vacuum is smaller than that in the medium.
[C] All other mediums are optically rarer than vacuum.
[D] Velocity of light in vacuum is always constant.
  89. If the dioptre of a lens is doubled, its power will...
    [A] become half [B] double [C] become four times [D] not change
  90. Match items in Part A with appropriate statement in Part B.

    [A] 1-b, 2-d, 3-c, 4-a [B] 1-c, 2-b, 3-d, 4-a
[C] 1-c, 2-d, 3-b, 4-a [D] 1-d, 2-c, 3-a, 4-b
  91. Match the position of object in Part A with appropriate position of image in Part B.

    [A] 1-b, 2-a, 3-d, 4-c [B] 1-a, 2-d, 3-b, 4-c
[C] 1-a, 2-c, 3-b, 4-d [D] 1-b, 2-d, 3-a, 4-c
  92. Match appropriate pairs from Part A (magnification) and Part B (type of mirror/lens)

    [A] 1-b, 2-c, 3-a, 4-d [B] 1-d, 2-a, 3-b, 4-c
[C] 1-b, 2-d, 3-c, 4-a [D] 1-a, 2-c, 3-d, 4-b
  93. A parallel beam of light does not remain parallel after reflection from a ...
    [A] plane mirror [B] concave mirror [C] convex mirror [D] irregular reflecting surface
  94. _____ is the midpoint between the pole and the centre of curvature along the principal axis...
    [A] Principal focus [B] Focal length [C] u [D] v
  95. A convex lens forms a real, inverted and same sized image as the object placed at a distance of 40 cm from it. The power of the lens is _____D.
    [A] +20 [B] -20 [C] +5 [D] -5

  96. [A][B][C][D]


ANSWERS


(1) A (2) C (3) B (4) B (5) C (6) C (7) B (8) A (9) C (10) D (11) B (12) D (13) D (14) A (15) C (16) B (17) C (18) B (19) D (20) B (21) D (22) C (23) C (24) B (25) C (26) D (27) A (28) A (29) B (30) C (31) B (32) B (33) D (34) C (35) A (36) A (37) B (38) D (39) D (40) B (41) D (42) C (43) B (44) A (45) C (46) B (47) C (48) A (49) D (50) D (51) B (52) C (53) D (54) B (55) A (56) B (57) D (58) A (59) A (60) C (61) C (62) C (63) D (64) C (65) D (66) C (67) D (68) B (69) B (70) B (71) A (72) C (73) A (74) B (75) C (76) C (77) A (78) A (79) D (80) A (81) C (82) D (83) A (84) B (85) C (86) A (87) B (88) A (89) B (90) B (91) B (92) B (93) D (94) A (95) C
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