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Physics |
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326)Current fowing in a circuit is I, potential difference 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 | ||
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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 | ||
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