Physics - Questions (Section-1)
73Intensity of sound has
A. an object existenceB. a subject existence
C. no existence D. both subjective and objective existence
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74It is easier to roll a barrel full of coal tar than to pull it because
A. the full weight of the barrel comes into play when it is pulledB. the rolling friction is much less than the sliding friction
C. more surface area of the barrel is in contact with the road when it is pulled D. coal tar is a liquid and it flows in the barrel when it is rolled
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75Mica is used in electrical appliances such as electric iron because mica is
A. a good conductor of heat but a bad conductor of electricityB. a bad conductor of heat but a good conductor of electricity
C. a good conductor of heat as well as electricity D. a bad conductor of heat as well as electricity
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76Minimum number of unequal vectors which can give zero resultant are
A. twoB. three
C. four D. more than four
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77One nanometer is equal to
A. 10-6mB. 10-8m
C. 10-9m D. 10-5m
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78Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
A. eastB. west
C. northeast D. southeast
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