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
Correct Answer :
A. enclosing it in a thick walled iron box
Related Questions
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
The Indian Space Research Organisation (ISRO) is located at
Thumba
Bangalore
Ahmedabad
New Delhi
The number of galaxies that are visible without telescope on clear dark nights and away from bright lights is
one
two
three
infinite
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be
a parabola
a horizontal straight line
a vertical straight line
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Cyclotron is an apparatus used
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to produce intense magnetic field
to produce intense electrical field
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
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of all the above
The brightest planet in the Solar System is
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Mercury
Venus
Sirius
The colour of a star is an indication of its
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age
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36°
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The weight of a body is
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minimum at the equator
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the same everywhere
The earth's nearest neighbour in space is
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the Moon
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A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle
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its kinetic energy is halved
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The resistance of a wire depends on
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A photon is
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convection
radiation
sublimation
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atomic weight
absolute number
We see the flash of lightning before hearing the thunder because
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sound travels faster than light
lightning occurs nearer than thunder
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A bar magnet tied in the middle with a thread is suspended at the South Pole of the earth. The magnet will be in
a horizontal position
a nearly vertical position with its South Pole downwards
a nearly vertical position with its North Pole downwards
a slanting position
Credit for starting Space Science Research in India goes to
HJ Bhabha
SS Bhatnagar
V Sarabhai
CV Raman
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its atmosphere
its distance from the sun
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All the above
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
The period of oscillation of a simple pendulum depends upon
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the amplitude of vibration
acceleration due to the gravity at the site of experiment
In an oil lamp, holes are provided below the chimney so that
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the brightness of the lamp may be increased
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negative charge
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decrease
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have its shape changed
A man Jumping out of a moving train is thrown
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backward
sideways
None of the above
Expansion of a rod when heated
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is proportional to the increase of temperature
is inversely proportional to its original length
Both (a) and (b) above