purity
hardness
high density
high refractive index and low critical angle
D. high refractive index and low critical angle
Nitrogen
Oxygen
Chlorine
Freon
continue going upwards uninterrupted
reach a particular height and remain floating
burst after reaching some height
reach a particular height and start coming down
directly proportional to its pressure
inversely proportional to the square root of its pressure
directly proportional to the square root of its pressure
independent of its pressure
both pieces will lose their magnetism
one piece will have North Pole on both ends and the other South Pole on its both ends
each will remain a magnet with North Pole at one end and South Pole at the other
the longer piece will behave as a bar magnet while the smaller will have no magnetism at all
it stops due to malfunctioning
it starts emitting dangerous radioactive radiations
it is shut down to avoid explosion
it is ready to produce controlled energy
it resists oxidation when red hot
its melting point is high
it has got 60 times the resistance of copper
All the above
Evaporation at the surface causes cooling
The heat obsorbed at the surface is passed on to the bottom
Because of impurity in the water
Because of convection currents set up inside water
HJ Bhabha
SS Bhatnagar
V Sarabhai
CV Raman
10000 to 20000 Hz
50 to 15000 Hz
20 to 20000 Hz
15 to 50000 Hz
40 years
50 years
76 years
80 years
an electrophorus
an electroscope
an electromagnet
an ammeter
Jupiter
Mars
Mercury
Saturn
Sound energy from his mouth is then directed in one direction
The cupped hand acts as a cardboard tube of short length
The pitch of sound increases
Both (a) and (b)
increase
decrease
remain the same
first decrease and then increase
the heat emitted by the engine
the greenhouse effect
the good conducting power of the metal body
the double layered wind shield
linear motion
vibratory motion
rotational motion
None of the above
first rise and then fall
fall
remain the same
rise
it has no population
it is quite far off
its surface is full of rocks
its gravity is not sufficient for any atmosphere to hold on to it
Microphone converts sound energy into electrical energy.
Electric fan converts electrical energy into mechanical energy.
Battery converts chemical energy into electrical energy.
All the above
surface tension
capillarity
viscosity
diffusion
Mercury
Venus
Moon
Mars
a planet
a meteor
a star
a comet
Coulomb
Gilbert
Volta
Rutherford
will increase
will decrease
does not change
varies with the increase of depth of the immersion of the iron piece
doppler effect
beats
resonance
echo
the violet ray
the red ray
the green ray
the blue ray
rubber
plastic
aluminium
wood
it is pleasing to the eye
it has a traditional colour
it is easily distinguishable
it is most sensitive to the human eye
meteors
binaries
variable stars
bright stars
conduction
convection
radiation
sublimation