The velocity of sound in a medium is
directly proportional to its pressure
inversely proportional to the square root of its pressure
directly proportional to the square root of its pressure
independent of its pressure
Correct Answer :
D. independent of its pressure
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The spectrum of white light can be studied by
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a telescope
a stereoscope
a spectroscope
Powder clings to the skin because of
cohesion
adhesion
capillary action
absorption
The Indian Space Research Organisation (ISRO) is located at
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The heat produced in a conductor due to the passage of a current through it is proportional to
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For viewing objects placed at a higher level from a position at a lower level, the instrument used' Is known aa
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X-rays are used
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10-12 cm
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10-16 cm
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the loudness remains the same
the loudness decreases
the sound suddenly stops
The speed at which light travels in vacuum is
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5 x 108 ms-1
3 x 104 kms-1
3 x 108 ms-1
A transformer
converts direct current into alternating current
converts alternating current into direct current
steps up or steps down a given alternating current voltage
supplies current with zero resistance
A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will
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The colour of a star is an indication of its
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temperature
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In the case of bodies falling under gravity which of the following remains constant at a given place?
kinetic energy
potential energy
acceleration
All the above
Which of the following wires of same dimensions offers least resistance to the ,flow of current?
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The nuclear model of atom was first visualised by
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Neils Bohr
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JJ Thompson
If a bar magnet is broken into two pieces
both pieces will lose their magnetism
one piece will have North Pole on both ends and the other South Pole on its both ends
each will remain a magnet with North Pole at one end and South Pole at the other
the longer piece will behave as a bar magnet while the smaller will have no magnetism at all
The speed of sound in a medium depends upon the properties of the medium such as
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its elasticity
All the above
A car parked in the sun with its windows closed gets terribly hot inside. This is due to
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the greenhouse effect
the good conducting power of the metal body
the double layered wind shield
The body of an electrical appliance is earthed in order that
electricity may not leak
there may be smooth flow of electricity
a short circuit may be prevented
current may pass to the earth in case of a short circuit without doing any harm to the person
When ice melts, Its volume
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remains the same until all the ice has melted and then increases
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Pascal
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lining the walls, with leather panels put on over a layer of sound absorbent glass fibre
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Why is nuclear fusion also known as thermonuclear reaction?
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same number of protons and different number of electrons
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equal to its radius of curvature
equal to the reciprocal of its focal length (in metres)
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