a microphone
a headphone
a phonograph
an amplifier
C. a phonograph
of the surface tension of mercury
mercury is a semi-solid
of the high viscosity of mercury
the density of mercury is greater than that of steel
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)
Crown glass
Water
Flint glass
Diamond
increase
decrease
remain unaffected
have its shape changed
they contain free electrons
their atoms are relatively far apart
their atoms collide frequently
they have reflecting surfaces
adhesion
surface tension
gravitational force
atmospheric pressure from all sides
cannot be attained experimentally
can be attained
is impossible
Does not exist at all
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
Volts
Amperes
ohms
coulombs
both its mass and weight will be different
its mass will be different but the weight will remain the same
its mass and weight will both remain unchanged
its mass will remain the same but weight will be different
proton
neutron
electron
positron
insulators
semiconductors
superconductors
condenser
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
will increase
will decrease
does not change
varies with the increase of depth of the immersion of the iron piece
at the middle
at a point away from the hinge (near the rim)
near the hinge
None of the above
diffusion
viscosity
surface tension
capillarity
is proportional to that of the Celsius thermometer
is always greater than that of the Celsius thermometer
is always less than that of the Celsius thermometer
may be greater than or less than or equal to that of the Celsius thermometer
enclosing it in a thick walled iron box
wrapping it with an insulator
by placing it inside a glass case
by surrounding it with fine copper gauze
a fluid to transmit the braking force
the force applied by the driver
hydrogen gas and not any liquid
a vacuum brake
Thorium
Uranium
Plutonium
Radium
in the live wire
in the neutral wire
in the earth wire
anywhere
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
a straight line
an ellipse
a circle
a parabola
the mass of its bob
the material of the bob
the amplitude of vibration
acceleration due to the gravity at the site of experiment
Earth and Mars
Venus and Earth
Mars and Jupiter
Moon and Mars
half
one fourth
four times
two times
Jupiter
Mars
Mercury
Saturn
it is pleasing to the eye
it has a traditional colour
it is easily distinguishable
it is most sensitive to the human eye
one
two
three
infinite
a horizontal position
a nearly vertical position with its South Pole downwards
a nearly vertical position with its North Pole downwards
a slanting position