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Physics

326)Current fowing in a circuit, potential didderence is V, resistance is R then VI represent
heat generated in the circuit power radiated by the circuit
rate of change of resistance rate of change of current
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327)Two metalic wires A nad B of same materials and same length. If the cross section of B is double than that of A, then resistance of B is
Twice of A Four times of A
One fourth of A Half of A
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328)A reflecting telescope consists of
Two convex lenses of unequal focal lengths Two concave lenses of unequal focal length
Two convex lenses of equal focal lengths Two concave lenses of equal focal length
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329)The neuclear fusion in the sun requires
Low temperature and high pressure High temperature and low pressure
High temperature and no pressure Very high temperature and very high pressure
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330)Electrically charged particles from space travel at very high speed, can severely harm living beings on earth. What prevents this particles from reaching the earth?
Ozone layer reflects these particles in the space Moisture in the upper layer of atmosphere absorbed the particles
The earth's magnetic field diverts these particles None of these
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331)Domestic electricity in India is in the form
110V, 50 Hz 220V, 40 Hz
220V, 50 Hz 110V 60Hz
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332)Why yollow colour light is used as fog light ?
It has shortage wevelength among all colours and nor reserved for any other purpose Longest wavelength except red and oragne. Red ligtht is used as break light and stop signal, orange colour is forbidden for its similarity with red colour.
Light is most scattered by fog None of these
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333)Why is it difficult to cut things with a blunt knife?
Blunt knife decreases the area of intersection Sharp edge decreases the pressure exerted by knife for a given force
The pressure exerted by knife for a given force increases with increase in bluntness Blunt knife decreases the preassure for a given force
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334)Why a telescope is place in the space to view the distant galxies?
To avoid absorbtion of light and other radiation in the atmosphere of the earth. To avoid the streering the telescope against the motion of the earth.
To get closer to the objects None of these
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335)A wooden ball and an Iron ball are dopped from a height in vacuum then
The iron ball will reach the ground first The wooden ball will reach the ground first
They will touch the ground at the same time Can not be said
Answer :

336)A body weight W kg at the equator will weight _________ at the pole.
More than W kg Less than W kg
Zero W kg
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337)When does the total internal reflection occure?
When light travels from denser medium to rarer medium When light travels from rarer medium to denser medium
When light travels from denser medium to rarer medium with angle of incidence greater than critical angle When light travels from rarer medium to denser medium with angle of incidence greater than critical angle
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338)Generally SONAR is used by
Astronauts Navigators
Doctors None of these
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339)An electrical fuse rated as 16A. What does it mean?
It has resistance 16 ohm It will not work if current is less than 16A
It will work only if current is more than 16A It will be burnt out if current is more than 16A
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340)A solid sphere, a disc and a solid cylinder all are of same material are allowed to roll down from rest on an inclined plane then
All will reach the bottom at the same time Disc will reach the bottom first
Cylinder will reach the bottm first Sphere will reach the bottom first
Answer :

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