General science mcq


Page-9

Gen. Science

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
Answer :

118)A dynamo converts
mechanical energy into electrical energy light energy into electrical energy
chemical energy into electrical energy potential energy to electrical energy
Answer :

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
Answer :

120)Which of the following sounds can be heard by human ear?
10000 vibrations/sec 25000 vibrations/sec
30000 vibrations/sec 31 vibrations/sec
Answer :

121)When cream is separated from milk, density of milk
increases decreases
remain unchanged can no be said
Answer :

122)Which one of the following is a fusion process?
hydrogen bomb atom bomb
ordinary bomb none of these
Answer :


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
Answer :

124)Which one of the following is abundantly present in the atmosphere?
hydrogen oxygen
nitrogen carbondioxide
Answer :

125)The filament of an electric bulb is made up of
copper iron
tungsten tin
Answer :

126)The role of alum in water purification is
to kill bacteria to coagulate mud particles
to remove salt to remove gases
Answer :

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
Answer :

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
Answer :

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
Answer :

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
Answer :

131)Buoyancy is related to
weight of the body immersed shape of the body immersed
mass of the liquid displaced depth of the liquid
Answer :

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