MCQ
Three capacitors whose capacitances are 2,4 and $\chi_\mu F$ respectively. They are combine first in series and then in parallel. In both the cases the ratio of their equivalents will be :
- A49:4
- ✓4:49
- C3:7
- DNone of these
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Which of the following is conserved when light waves interfere
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(a) Intensity |
(b) Energy |
(c) Amplitude |
(d) Momentum |
The electric field E, current density J and conductivity s of a conductor are related as
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(a) σ = E/j |
(b) σ = j/E |
(c) σ = jE |
(d) σ = 1/jE |
Assertion : A potentiometer of longer length is used for accurate measurement.
Reason : The potential gradient for a potentiometer of longer length with a given source of e.m.f. becomes small.
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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 : A domestic electrical appliance, working on a three pin will continue working even if the top pin is removed.
Reason : The third pin is used only as a safety device.
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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. |