18 km/s
11.2 km /s
21 km/s
35 km/s
B. 11.2 km /s
Frequency
Amplitude
Speed
Wavelength
it can be transmitted easily and efficiently
Alternating Current (AC) loses the least amount of energy when transmitted at high voltages
Alternating Current (AC) voltage can be easily increased or decreased
all the above
rubber
plastic
aluminium
wood
the size and shape of the room
the ability of the ceiling, walls and floor to exclude unwanted sound
the use of furnishings made of sound absorbing materials
All the above
Rutherford
Neils Bohr
Albert Einstein
JJ Thompson
1985
1957
1959
1960
its atmosphere
its distance from the sun
its rotation
All the above
the nature of the liquid
area of the exposed surface of the liquid
temperature of air and of the liquid
All the above
viscosity
surface tension
friction
elasticity
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
a microphone
a headphone
a phonograph
an amplifier
Space ship
Lunar module
Radar
Rocket
Bangalore
Mumbai
Ahmedabad
New Delhi
powerful X-rays falling on the earth from space
ultraviolet rays from the sun
gamma rays from radioactive minerals
very energetic radiation falling upon the earth from outer space consisting chiefly of charged particles
Proxima Centauri
Sirius
Aldebaran
Vega
its density
its temperature
its elasticity
All the above
the loudness of the sound increases
the loudness remains the same
the loudness decreases
the sound suddenly stops
�± -rays
�² -rays
�³ -rays
Cosmic rays
cool the engine
heat up the engine
start the car
moderate the speed
on the outer surface
in the inner surface
at the centre of the ring
None of the above
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
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
it has high thermal conductivity
it has uniform expansivity
it has high boiling point and low freezing point
of all the above
an indeterminate quantity
equal to the weight of the ship
greater than the weight of the ship
less than the weight of the ship
of the same size as the object
at the same distance behind the mirror as the object is in front of it
virtual and laterally inverted
All the above
The Milky Way
Radio Galaxy
Andromeda Nebula
Magellanic Clouds
cohesion
adhesion
capillary action
absorption
a neutron star
a binary star
a dwarf star
a polar star
October 20, 1978
November 14, 1978
January 26, 1979
April 19, 1975
turbulence caused by the wind
buoyancy of air
unequal pressures acting on it
sudden change in the direction of the wind