18 km/sec
11.2 km/ sec
21 km/ sec
35 km/ sec
B. 11.2 km/ sec
half
one fourth
four times
two times
mechanical energy is converted to light energy
mechanical energy is converted to heat energy
mechanical energy is converted to electrical energy
electrical energy is converted to mechanical energy
it is practically inexhaustible
it is the cheapest form of energy
it does not cause pollution
All of the above
Mars
Venus
Earth
Mercury
Voltmeter
Voltameter
Ammeter
Potentiometer
chemical energy into heat energy
mechanical energy into heat energy
protons into neutrons
mass into energy according to Einstein's equation
a stone
a piece of wood
a feather
all will reach the ground at the same time
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
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
X
Y
X + Y
X Y
reduction of seating capacity in the hall
increase of sound intensity in the hall
lining the walls, with leather panels put on over a layer of sound absorbent glass fibre
by opening the doors and windows of concert hall
decreases
increases
remains the same until all the ice has melted and then increases
remains the same
diffusion
effusion
vaporisation
sublimation
heat waves
sound waves
radio waves
light waves
a stone
a piece of wood
a feather
all will reach the ground at the same time
50 kg
45 kg
zero
150 kg
Saturn
Jupiter
Earth
Mercury
an ammeter
a rheostat
a voltmeter
a voltameter
convex mirrors
concave mirrors
convex lens
concave lens
as an accelerator for imparting energies to charged particles of atomic magnitudes
to reduce the charge on a particle
to produce intense magnetic field
to produce intense electrical field
X
Y
X + Y
X Y
a fluid to transmit the braking force
the force applied by the driver
hydrogen gas and not any liquid
a vacuum brake
a unit of time
a unit of length
a year of no consequence
illumination throughout the year
equal to half its focal length
equal to its focal length
twice its focal length
not related to its focal length
look like falling stars
are really pieces of rock or metal
burn up as they shoot through the air
All the above
frequency is higher
wavelength is smaller
pitch is smaller
air is warmer
the resistance
the square of the current flowing through it
the time the current flows
All the above
18 km/s
11.2 km /s
21 km/s
35 km/s
sound energy is converted into electrical energy
electrical energy is converted into sound energy
sound energy is converted into mechanical energy
mechanical energy is converted into sound energy
does not allow the lightning to fall on the building at all
drives away the charged clouds
forces the lightning to fall on other buildings near that building
conducts the electric charges to the ground when lightning strikes the building