- A$m ^2 V^{-1} S^{-1}$
- B$m ^2 \Omega^* C ^{-1}$
- C$kg ^{-1} Cs$
- ✓All of the above
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A step up transformer connected to a 220 V AC line is to supply 22 kV for a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10 mA. The turn ratio of the transformer is
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(a) 50 |
(b) 100 |
(c) 150 |
(d) 200 |
An electron is accelerated through a p.d. of 45.5 volt. The velocity acquired by it is (in ms-1)
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(a) 4 |
(b) 4 |
(c) |
(d) Zero |
Two thin lenses whose powers are +2D and –4D respectively combine, then the power of combination is
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(a) – 2D |
(b) + 2D |
(c) – 4D |
(d) + 4D |
Assertion : Annihilation of electron and positron is an example of decay of charges.
Reason : In the process of annihilation an electron and a positron combine to give a gamma particle.
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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. |