- AAttractive
- BRepulsive
- CBoth
- DNone
Explanation:
An attractive property is develop in the comb due to friction. The comb on rubbing over dry hairs is aid to be charged.
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A conducting ring is placed around the core of an electromagnet as shown in fig. When key K is pressed, the ring

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(a) Remain stationary |
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(b) Is attracted towards the electromagnet |
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(c) Jumps out of the core |
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(d) None of the above |
Assertion : We can measure the potential barrier of a PN junction by putting a sensitive voltmeter across its terminals.
Reason : The current through the PN junction is not same in forward and reversed bias.
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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 assertion is false but reason is true. |
A convex lens of ______ focal length gives a greater magnification than lenses of _______ focal length.
In the white light of sun, maximum scattering by the air molecules present in the earth's atmosphere is for:
A dip needle in a plane perpendicular to magnetic meridian will remain
| (a) Vertical | (b) Horizontal |
| (c) In any direction | (d) At an angle of dip to the horizontal |