76 .The length of the pendulum isdoubled and the mass of its bob is halved.Its time sperod would
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Answer : Option C |
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77 .Vibration magnetometer works on the principle of
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Answer : Option A |
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78 .Which one of the following is the most stable ecosystem?
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Answer : Option B |
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79 .The primary colours in phothgraphy are
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Answer : Option C |
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80 .Cosmic rays
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Answer : Option A |
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81 .Myopia is due to
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Answer : Option D |
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82 .A motor converts
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Answer : Option C |
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83 .Which of the following is not caused by atmospheric refraction of light?
Answer & Explanation
Answer : Option A |
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84 .What is the difference between aCFL and an LED LAMP?
( 1 ) Toproduce light, a CFL uses mercuryvapour and phosphor while an LED lampuses semi- conductor material.
( 2 ) The average life span of a CFL ismuch longer than of and LED lamp.
( 3 ) A CFL is LESS energy -efficient ascompared to an LED lamp.
Which of the statements given aboveis/are correct?
Answer & Explanation
Answer : Option C |
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85 .The mercury and sodium street lamps light up because of.
Answer & Explanation
Answer : Option B |
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86 .The least penetrating power ray is
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Answer : Option A |
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87 .Different objects at different distances are seen by the eye. The paramenter athe remains. Constent is
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Answer : Option D |
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88 .Colours of thin films are due to
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Answer : Option B |
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89 .The clouds float in the atmosphere because of their low The clouds float in the atmosphere because of their low
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Answer : Option B |
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90 .X- rays were discovered by-
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Answer : Option A |
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