212°
32°
-40°
0°
C. -40°
similar charges of electricity rush towards each other and then get repelled
clouds strike against impurities in air and the friction burns up these impurities
strong opposite charges in different clouds break down the resistance offered by the intervening air
water vapour produces electricity in the clouds
convex mirrors
concave mirrors
concave lenses
lenses irrespective of types
sugar
sodium carbonate
common salt
carbonates of calcium and magnesium
is proportional to that of the Celsius thermometer
is always greater than that of the Celsius thermometer
is always less than that of the Celsius thermometer
may be greater than or less than or equal to that of the Celsius thermometer
the curvature of earth limits the range of reception
the signals are weak
the signals are absorbed by air
the antennae are not powerful enough
Lens
Iris
Retina
Eyelid
Space ship
Lunar module
Radar
Rocket
a parabola
a horizontal straight line
a vertical straight line
a circle
watt
degree
joule
erg
able to refract the sound
good absorbers of sound
good reflectors of sound
All the above
the floor and carpet are at different temperatures
the stone conveys the heat away from the feet more rapidly than the carpet
the carpet is a better conductor of heat than the stone
the human body maintains a constant temperature
a planet
a meteor
a star
a comet
will increase
will decrease
will have no change
will either increase or decrease
helium
argon
hydrogen
oxygen
the path of a star which is nearest to the earth
a galaxy which includes the sun
a star that is nearest to the earth
None of these
to increase the current flow in a circuit
to decrease the current flow
to measure the flow of electric current
Either (a) or (b) above
cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules
the adhesive forces between mercury and glass molecules are greater than the cohesive forces
both the cohesive and adhesive forces are equal
None of the above
an ammeter
a rheostat
a voltmeter
a voltameter
its momentum is halved
its kinetic energy is halved
its acceleration is halved
its potential energy is halved
temperature of air
intensity of light
density of a liquid
relative humidity of the atmosphere
the heat emitted by the engine
the greenhouse effect
the good conducting power of the metal body
the double layered wind shield
they can see very dearly only in darkness
they produce ultrasonic waves which guide them
their eyes are sensitive to darkness
their eye holes expand in darkness
adhesion
surface tension
gravitational force
atmospheric pressure from all sides
the nature of the radiating surface
area of the radiating surface
temperature difference between the body and the surroundings
All the above
placing it inside a solenoid through which an alternating current is flowing
heating the magnet to redness and then allowing it to cool
dropping it several times or hammering it while lying east-west
All the above
lost all its potential energy and gained an equivalent amount of kinetic energy
gained potential energy and lost kinetic energy
gained kinetic energy as well as potential energy
lost kinetic energy as well as potential energy
fluorescence
incandescence
both (a) and (b)
None of these
Rutherford
Bohr
Henri Bacquerel
Marie Curie
to make it smooth and frictionless
to make it rust - proof
to reduce heat loss by radiation
to make it more durable
find out the specific gravity of liquids
measure the volumes of liquids
test the purity of milk
determine the strength of acid in car batteries