MCQ
Soap bubble looks coloured due to:
- ADispersion
- BReflection
- CInterference
- DNone of these
Explanation:
Colours are seen due to interference between waves reflected from the top and bottom of soap bubble.
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The large scale destruction, that would be caused due to the use of nuclear weapons is called
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(a) Nuclear holocaust |
(b) Thermo-nuclear reaction |
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(c) Nuetron reproduction factor |
(d) None of these |
The magnetic moment of a circular coil carrying current is
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(a) Directly proportional to the length of the wire in the coil |
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(b) Inversely proportional to the length of the wire in the coil |
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(c) Directly proportional to the square of the length of the wire in the coil |
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(d) Inversely proportional to the square of the length of the wire in the coil |
Assertion : An N-type semiconductor has a large number of electrons but still it is electrically neutral.
Reason : An N-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.
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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. |
Can a metal be used as a medium for dielectric
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(a) Yes |
(b) No |
(c) Depends on its shape |
(d) Depends on dielectric |
$\mu<\mu',\text{M < M}'$
$\mu>\mu',\text{M < M}'$
$\mu<\mu',\text{M > M}'$
$\mu>\mu',\text{M > M}'$