Effective capacitance between A and B in the figure shown is (all capacitance are in mF)
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(a) 21 mF |
(b) 23 mF |
(c) |
(d) |
Effective capacitance between A and B in the figure shown is (all capacitance are in mF)
|
(a) 21 mF |
(b) 23 mF |
(c) |
(d) |
(d)
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The relation between a and b parameters of current gains for a transistors is given by
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(a) α = |
(b) α = |
(c) α = |
(d) α = |
A thin rod of length f/3 lies along the axis of a concave mirror of focal length f. One end of its magnified image touches an end of the rod. The length of the image is
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(a) f |
(b) |
(c) 2f |
(d) |
Assertion : Radioactivity of
undecayed radioactive nuclei of half life of 50 days is equal to that of 1.2
number of undecayed nuclei of some other material with half life of 60 days
Reason : Radioactivity is proportional to half-life.
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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. |
Assertion : There is no current in the metals in the absence of electric field.
Reason : Motion of free electron are randomly.
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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. |