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1) For refraction of light, the angle of incidence must be a. equal to zero b. less than zero c. greater than zero d. less than or greater than zero
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2) Tiny rain droplets act like a a. glass b. mirror c. prism d. drop of oil
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3) The critical angle for water is a. 36 degree b. 42 degree c. 48 degree d. 54 degree
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4) The refractive index of soda-lime glass is a. 0.5 b. 1 c. 1.5 d. 2
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5) The colors on the disk are mixed a. by our eyes b. due to fast rotations c. due to humidity d. due to pressure
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6) 'Rainbows' can only be seen when the sun a. has hidden behind clouds b. is shining c. has hidden behind mountains d. has set
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7) The critical angle for diamond is a. 20 degree b. 22 degree c. 24 degree d. 26 degree
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8) When a beam of white light is refracted, it spreads into a. five colors b. six colors c. seven colors d. nine colors
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9) A 'green filter' would a. allow only green color to pass b. allow red and blue to pass c. allow green color and its components to pass d. allow all colors except green
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10) We see yellow color on the screen because a. red and blue dots shine more than green dots b. green and red dots shine more than blue dots c. green and blue dots shine more than red dots d. dots shine at the same rate
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11) 'Prisms' with total internal reflection are used in a. telescopes b. glasses c. mirrors d. side mirrors of cars
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12) The waves at the bottom of spectrum are a. infrared waves b. gamma-rays c. x-rays d. ultraviolet rays
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13) Unlike sound, light depends on a. source b. vibrations c. frequency d. amplitude
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14) The objects that do not produce their own light are known as a. luminous objects b. non luminous objects c. opaque objects d. translucent objects
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15) The speed of light in soda-lime glass is a. 100,000 km/s b. 150,000 km/s c. 200,000 km/s d. 250,000 km/s
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16) When red and green colors are mixed together, they form a. yellow color b. magenta color c. orange color d. purple color
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17) The cones are sensitive to a. bright light b. dim light c. colored Vision d. blur Vision
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18) When green and blue colors are combined together, they form a. orange b. grey c. cyan d. maroon
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19) Each material has a. same values of critical angle b. different values of critical angle c. alternate values of critical angle d. calculated values of critical angle
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20) If light enters the glass with an angle of 44 degree or greater, it a. would refract b. would not reflect c. would end up d. would not refract
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