- APolar molecule.
- BNon polar molecule.
- CBoth a and b.
- DNone.
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In the case of bar magnet, lines of magnetic induction
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(a) Start from the north pole and end at the south pole |
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(b) Run continuously through the bar and outside |
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(c) Emerge in circular paths from the middle of the bar |
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(d) Are produced only at the north pole like rays of light from a bulb |
Myopia is due to
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(a) Elongation of eye ball |
(b) Irregular change in focal length |
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(c) Shortening of eye ball |
(d) Older age |


The self inductance of a coil is 5 henry, a current of 1 amp change to 2 amp within 5 second through the coil. The value of induced e.m.f. will be
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(a) 10 volt |
(b) 0.10 volt |
(c) 1.0 volt |
(d) 100 volt |
The angle between the earth's magnetic and the earth's geographical axes is
| (a) Zero | (b) 17° | (c) 23° | (d) None of these |
Assertion : A current I flows along the length of an infinitely long straight and thin walled pipe. Then the magnetic field at any point inside the pipe is zero.
Reason :
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |