MCQ
Three capacitors of capacitance $6~\mu F$ are available. The minimum and maximum capacitance obtained are :
- A$3~\mu F,$ $12~\mu F$
- B$2~\mu F,$ $12~\mu F$
- ✓$2~\mu F,$ $18~\mu F$
- D$6~\mu F,$ $18~\mu F$
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Assertion : Dielectric breakdown occurs under the influence of an intense light beam.
Reason : Electromagnetic radiations exert pressure.
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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. |
Electromagnetic radiation of highest frequency is
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(a) Infrared radiations |
(b) Visible radiation |
(c) Radio waves |
(d) g-rays |
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 |
The magnetic compass is not useful for navigation near the magnetic poles because
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(a) The magnetic field near the poles is zero |
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(b) The magnetic field near the poles is almost vertical |
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(c) At low temperature, the compass needle looses its magnetic properties |
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(d) Neither of the above |