replace the fuse by a thin wire
replace the fuse by a thick copper wire
replace the fuse by a fuse wire of proper rating
replace the fuse by nichrome wire
Wilhelm Roentgen
WO Coolidge
Henry Cavendish
William Watson
direct sun's rays
radiation from earth's surface
radiogenic heat (resulting from radioactive decay)
cosmic rays coming from space
he may increase his speed
his weight may be reduced
necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion
no frictional force may be produced between the wheels and the axle
alternating current of very high frequency
alternating current of very high voltage
a very large direct current
a high voltage direct current
Marconi
Baird
John Bardeen, Walter H. Brattain and William Shockley
Edison
the mass of earth
the mass of the satellite
the radius of the earth
gravitation of the earth
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)
to make it smooth and frictionless
to make it rust - proof
to reduce heat loss by radiation
to make it more durable
50 kg
45 kg
zero
150 kg
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
neutrons
electrons
phonons
photons
momentum
velocity
acceleration
inertia
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
a microphone
a headphone
a phonograph
an amplifier
lowers the melting point of ice
raises the melting point of ice
has no effect on the melting point of ice
may lower or raise the melting point depending upon the type of impurities
a neutron star
a binary star
a dwarf star
a polar star
able to refract the sound
good absorbers of sound
good reflectors of sound
All the above
Frequency
Amplitude
Speed
Wavelength
sugar
sodium carbonate
common salt
carbonates of calcium and magnesium
0°
30°
45°
60°
the eye lens being thin
the eye lens being thick
lack of symmetry in the curvature of the eye preventing rays of light from being brought to a common focus
the pupil being very small
zero
the centrifugal force
reaction due to steady burning of fuel
the gravitational pull on the body by the earth is the weight of the body which provides the centripetal force
its atmosphere
its distance from the sun
its rotation
All the above
look like falling stars
are really pieces of rock or metal
burn up as they shoot through the air
All the above
Jupiter
Mercury
Venus
Sirius
coulomb
ampere
volt
watt
increase
decrease
remain the same
first decrease and then increase
air
glass
vacuum
water
no charge
positive charge
negative charge
can't be said