MCQ
The dimensions of capacitance are:
- A[M L-2 T4 A-2]
- B[M L-2 T-4 A2]
- C[M-1 L-2 T-4 A2]
- DNone
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A small object is placed 10 cm infront of a plane mirror. If you stand behind the object 30 cm from the mirror and look at its image, the distance focused for your eye will be
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(a) 60 cm |
(b) 20 cm |
(c) 40 cm |
(d) 80 cm |
A and B are two radioactive substances whose half lives are 1 and 2 years respectively. Initially 10 gm of A and 1 gm of B is taken. The time (approximate) after which they will have same quantity remaining is
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(a) 6.62 years |
(b) 5 years |
(c) 3.2 years |
(d) 7 years |
Assertion : Fax is a modulating and demodulating device.
Reason : It is necessary for exact reproduction of a document.
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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. |
Large transformers, when used for some time, become hot and are cooled by circulating oil. The heating of transformer is due to
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(a) Heating effect of current alone |
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(b) Hysteresis loss alone |
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(c) Both the hysteresis loss and heating effect of current |
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(d) None of the above |