The similarity between the sound waves and light waves is
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(a) Both are electromagnetic waves |
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(b) Both are longitudinal waves |
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(c) Both have the same speed in a medium |
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(d) They can produce interference |
(d) They can produce interference
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Light takes 8 min 20 sec to reach from sun on the earth. If the whole atmosphere is filled with water, the light will take the time (a
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(a) 8 min 20 sec |
(b) 8 min |
(c) 6 min 11 sec |
(d) 11 min 6 sec |
When a magnetic substance is heated, then it
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(a) Becomes a strong magnet |
(b) Losses its magnetism |
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(c) Does not effect the magnetism |
(d) Either (a) or (c) |
A positively charged thin metal ring of radius R is fixed in the xy - plane with its centre at the O. A negatively charged particle P is released from rest at the point (0, 0, 
where 
. Then the motion of P is
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(a) Periodic for all values of |
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(b) Simple harmonic for all values of satisfying 0 < |
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(c) Approximately simple harmonic provided |
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(d) a, c |
One proton beam enters a magnetic field of 
T normally, Specific charge = 
. velocity = 
. What is the radius of the circle described by it
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(a) 0.1 m |
(b) 1 m |
(c) 10 m |
(d) None of these |
An electron is moving with a speed of 
perpendicular to a uniform magnetic field of intensity B. Suddenly intensity of the magnetic field is reduced to B/2. The radius of the path becomes from the original value of r
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(a) No change |
(b) Reduces to r / 2 |
(c) Increases to 2r |
(d) Stops moving |
64 small drops of mercury, each of radius r and charge q coalesce to form a big drop. The ratio of the surface density of charge of each small drop with that of the big drop is
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(a) 1 : 64 |
(b) 64 : 1 |
(c) 4 : 1 |
(d) 1 : 4 |
A man is suffering from colour blindness for green colour. To remove this defect, he should use goggles of
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(a) Green colour glasses |
(b) Red colour glasses |
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(c) Smoky colour glasses |
(d) None of the above |
