Increase in pressure
increases the melting point of ice
decreases the melting point of ice
has no effect on the melting point of ice
increases the volume of the ice
Correct Answer :
B. decreases the melting point of ice
Related Questions
A lactometer is used to
find out the specific gravity of liquids
measure the volumes of liquids
test the purity of milk
determine the strength of acid in car batteries
A bolometer is used to measure
the quantity of heat energy in a body
thermal radiations quantitatively
high temperature
the intensity of sound
The force that keeps a body in a circular motion is called
the centripetal force
the centrifugal force
the frictional force
All the above
A stationary elevated object has
kinetic energy
potential energy
momentum
both potential and kinetic energy
A person does not sink in the Dead Sea because
the sea contains a large amount of other salts besides sodium chloride
the density of the person is less than the density of the Dead Sea water
of the surface tension due to salt water in the Dead Sea
of difference in mass
The image of an object formed on the retina of the eye is
virtual and upright
virtual and inverted
real and inverted
real and upright
An ohm is a unit of
potential difference
resistance
current
All the above
Fish and other aquatic creatures can live inside a deep frozen pond because
fish are cold-blooded animals
ice is a bad conductor of heat
there will always be water just beneath the ice level
they can adapt themselves to live in ice
A photon is
a quantum of electromagnetic radiation
light source used in photography
a photo film
sun-light
The instrument used to measure atmospheric pressure is
Pyrometer
Eudiometer
Barometer
Hydrometer
A series of east moving still pictures can be made to appear as a moving picture because the eye
can focus very rapidly as pictures change
is quicker than the brain
can see two images separated only if the interval' between seeing them is more than' one-tenth of a second
can shut out some of the light
When are temperature resistance
increases
decreases
remains the same
first increases then decreases
A cyclist leans inwards when he is negotiating a curve 10 that
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
The inability of a body to change its state of rest or uniform motion along a straight line is called its
momentum
velocity
acceleration
inertia
The light from the star nearest to the sun reaches the earth in
8 minutes
4.3 years
12 seconds
24 hours
When ice just melts
there is no change in volume
there is no change in temperature
heat is given out
there is no change of state
Which of the following rays has the highest penetrative power?
a -rays
� -rays
? -rays
X-rays
The cell that can be recharged, after it has run down, by passing a direct current through it from a source of current is
Voltaic cell
Leclanche cell
Dry cell
An accumulator
The heat generated in a conductor carrying current is proportional to
the resistance
the square of the current flowing through it
the time the current flows
All the above
A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field by
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
The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is
Hygrometer
Hypsometer
Hydrometer
Densimeter
Drinks kept in a vacuum flask remain hot or cold as the case may be for a long time because
both walls are silvered on the vacuum side
there is vacuum between the double walls
the cork is a poor conductor of heat
of all the above
Light from the sun reaches the earth in
2 minutes
4 minutes
12 minutes
8 minutes
Which metal is used in storage batteries?
Copper
Lead
Tin
Iron
The filament lamp is an example for
fluorescence
incandescence
both (a) and (b)
None of these
In a longitudinal wave, the direction of propagation of the wave is
the same as the direction of the vibrations of the vibrating body
at right angles to the direction of the vibrations of the vibrating body
Both (a) and (b) above
None of the above
The radiator in a car serves to
cool the engine
heat up the engine
start the car
moderate the speed
The frequency of an ultrasonic wave is
the same as that of an audible sound
above the audible range
below the audible range
None of the above
Acoustics is a property or
Physics
Chemistry
Biology
Economic
The overhead wires supported by high towers in the grid system carry
alternating current of very high frequency
alternating current of very high voltage
a very large direct current
a high voltage direct current