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Gen. Science |
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| 117)A photo electric cell converts | |||
| mechanical energy into electrical energy | light energy into electrical energy | ||
| chemical energy into electrical energy | potential energy to electrical energy | ||
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| 118)A dynamo converts | |||
| mechanical energy into electrical energy | light energy into electrical energy | ||
| chemical energy into electrical energy | potential energy to electrical energy | ||
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| 119)An electrical motor converts | |||
| mechanical energy into electrical energy | electrical energy into mechanical energy | ||
| chemical energy into electrical energy | potential energy to electrical energy | ||
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| 120)Which of the following sounds can be heard by human ear? | |||
| 10000 vibrations/sec | 25000 vibrations/sec | ||
| 30000 vibrations/sec | 31 vibrations/sec | ||
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| 121)When cream is separated from milk, density of milk | |||
| increases | decreases | ||
| remain unchanged | can no be said | ||
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| 122)Which one of the following is a fusion process? | |||
| hydrogen bomb | atom bomb | ||
| ordinary bomb | none of these | ||
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| 123)Which one of the following is determined by wet-bulb and dry-bulb thermometer? | |||
| highest and lowest temperature | highest temperature | ||
| relative humidity | lowest temperature | ||
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| 124)Which one of the following is abundantly present in the atmosphere? | |||
| hydrogen | oxygen | ||
| nitrogen | carbondioxide | ||
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| 125)The filament of an electric bulb is made up of | |||
| copper | iron | ||
| tungsten | tin | ||
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| 126)The role of alum in water purification is | |||
| to kill bacteria | to coagulate mud particles | ||
| to remove salt | to remove gases | ||
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| 127)Clear night is cooler than cloudy night because | |||
| clear night allows cold air to come from outer space | clear night allows fast radiation from earth crust | ||
| cloud radiates heat towards earth | none of these | ||
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| 128)Why a weather balloon is not fully inflated on the ground? | |||
| to keep the balloon stable | because air inside it expands as it rises up and it may burst | ||
| to withstand the air pressure at the high altitude | none of these | ||
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| 129)Which one of the following is the most accurate method for determining the age of crust of the earth? | |||
| accumulation of salt in the ocean | accumulation of sedimentary rock | ||
| atomic disintegration | accumulation of metamorphic rock | ||
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| 130)Steel is more elastic than rubber because | |||
| density of steel is more | Young\'s modulus of steel is more than rubber | ||
| Young\'s modulus of steel is less than rubber | steel is a metal | ||
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| 131)Buoyancy is related to | |||
| weight of the body immersed | shape of the body immersed | ||
| mass of the liquid displaced | depth of the liquid | ||
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