Pyrometer
Eudiometer
Barometer
Hydrometer
C. Barometer
equal to its focal length
equal to its radius of curvature
equal to the reciprocal of its focal length (in metres)
equal to twice its focal length
will increase
will decrease
does not change
varies with the increase of depth of the immersion of the iron piece
good conductor of heat
good conductor of electricity
bad conductor of electricity
Both (a) and (b) above
half
one fourth
four times
two times
increases as the square root of the absolute temperature
decreases with temperature
is independent of temperature
None of these
the ringing is not loud enough
the glass of the bell jar absorbs the sound waves
the bell jar is too small
there is no air or -any other gas in the bell jar
virtual and upright
virtual and inverted
real and inverted
real and upright
troposphere
stratosphere
mesosphere
ionosphere
1985
1957
1959
1960
transverse
longitudinal
transverse and longitudinal
neither transverse nor longitudinal
the telephone ear piece
the telegraph
the electric bell
All the above
air
glass
vacuum
water
1
infinite
0
4
50 kg
45 kg
zero
150 kg
the sun comes in between the earth and moon
the moon is stationary
the time taken by the moon to rotate on its axis is the same as the time taken by it to revolve round the earth
moon revolves round the sun
meteors
binaries
variable stars
bright stars
the air circulated by the fan is cool
the fan produces convection currents of air
the air circulated by the fan quickens the evaporation of the moisture on our skin
the air takes away the heat from our body
nuclear fission
nuclear fusion
chemical combustion
boiling
Newton
Pascal
Archimedes
Galileo
cohesive
centrifugal
frictional
gravitational
viscosity
surface tension
friction
elasticity
proton
neutron
electron
positron
October 20, 1978
November 14, 1978
January 26, 1979
April 19, 1975
amplitude
vibration
frequency
phase
there is very little friction between the ice and feet pressing it
ice is soft when compared to concrete
there is more friction between the ice and feet
None of the above
taking photos of various objects
recording and reproducing three dimensional images
tracing out planets and stars in the sky
transmitting light waves
James Clerk Maxwell
Heinrich Hertz
Thomas Alva Edison
Baird
its density
its temperature
its elasticity
All the above
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
coulomb
ampere
volt
watt