- AConstructive
- BDestructive
- CWhere intensity is less than maximum but not completely zero.
- DNone of these
Explanation:
Antinodal curves correspond to constructive interference.
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What is a virtual image?
When germanium is doped with phosphorus, the doped material has
|
(a) Excess positive charge |
(b) Excess negative charge |
|
(c) More negative current carriers |
(d) More positive current carriers |
A silver and a copper voltmeters are connected in parallel across a 6 volt battery of negligible resistance. In half an hour, 1 gm of copper and 2 gm of silver are deposited. The rate at which energy is supplied by the battery will approximately be (Given E.C.E. of copper = 3.294
and E.C.E. of silver = 1.118 ![]()
|
(a) 64 W |
(b) 32 W |
(c) 96 W |
(d) 16 W |
The plane surface of a plano-convex lens of focal length f is silvered. It will behave as
|
(a) Plane mirror |
(b) Convex mirror of focal length 2 |
|
(c) Concave mirror of focal length f/2 |
(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.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
A small rod of bismuth is suspended freely between the poles of a strong electromagnet. It is found to arrange itself at right angles to the magnetic field. This observation establishes that bismuth is
|
(a) Diamagnetic |
(b) Paramagnetic |
(c) Ferri-magnetic |
(d) Antiferro-magnetic |