lead
zinc
carbon
tin
A. lead
generally considered as a desert happening
caused by unequal heating of the several layers of the atmosphere above the desert
in which the refracted rays take a curved path resulting in total internal refection
All the above
attract each other
repel each other
neither attract nor repel
attract or repel depending upon the conditions
nuclear fission
nuclear fusion
chemical combustion
boiling
same number of protons but different number of neutrons
same number of neutrons but different number of protons
the same total number of protons and neutrons
same number of protons and different number of electrons
air
water
iron
vacuum
the atoms and molecules lose their identity
nucleus is split into fragments
the nuclear reaction between two light atomic nuclei results in the formation of a heavier nucleus with release of a large quantity of nuclear energy in the process
absorption of neutron by a nucleus
Saturn
Jupiter
Earth
Mercury
quinine sulphate solution
paraffin oil
fluorescein solutions
All the above
a hydrometer
a manometer
a lactometer
an anemometer
Proxima Centauri
Sirius
Aldebaran
Vega
cools the body that transfers it
heats the body that absorbs the heat
may change the physical state of the substance
All the above
nichrome
tungsten
copper
aluminium
used by warships and military aircraft to locate enemy submarines
used by ships to determine the depth of water beneath them
a detective device that uses sound to locate under - water objects
All the above
helium
argon
hydrogen
oxygen
virtual and upright
virtual and inverted
real and inverted
real and upright
the ball will travel towards the centre of the circle and fall down
it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
it will fall down at the same place where the string breaks
None of these
telescope
spectrometer
microscope
periscope
planets do not have light of their own whereas stars shine by their own light
planets do not twinkle like stars
planets are much smaller than stars
All the above
cool the engine
heat up the engine
start the car
moderate the speed
necessary oxygen for burning of oil may be provided
the convection current of air may be maintained to keep the lamp burning
the brightness of the lamp may be increased
All the above
to make it smooth and frictionless
to make it rust - proof
to reduce heat loss by radiation
to make it more durable
ultraviolet rays
gamma rays
radio waves
infrared waves
Lens
Iris
Retina
Eyelid
its momentum is halved
its kinetic energy is halved
its acceleration is halved
its potential energy is halved
so that they may reflect thermal radiation from outside and minimise such radiation from them
so that they may absorb all radiation from outside
to make them attractive to look at
because they take high polish
deflected by electric field
deflected by magnetic field
slightly deflected by electric field and magnetic field
not deflected by electric and magnetic fields
mercury thermometers
alcohol thermometers
platinum resistance thermometers
thermoelectric thermometers
12N
2N
10N
6N
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
will increase
will decrease
does not change
varies with the increase of depth of the immersion of the iron piece