Amplification factor of a triode is 10. When the plate potential is 200 volt and grid potential is – 4 volt, then the plate current of 4mA is observed. If plate potential is changed to 160 volt and grid potential is kept at – 7 volt, then the plate current will be
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(a) 1.69 mA |
(b) 3.95 mA |
(c) 2.87 mA |
(d) 7.02 mA |
(a) 1.69 mA
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Variation of current and voltage in a conductor has been shown in the diagram below. The resistance of the conductor is
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(a) 4 ohm |
(b) 2 ohm |
(c) 3 ohm |
(d) 1 ohm |
If eight identical drops are joined to form a bigger drop, the potential on bigger as compared to that on smaller drop will be
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(a) Double |
(b) Four times |
(c) Eight times |
(d) One time |
Assertion : There is no atmosphere on moon
Reason : Escape velocity at the surface of moon is low.
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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. |
To demonstrate the phenomenon of interference, we require two sources which emit radiation
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(a) Of the same frequency and having a define phase relationship |
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(b) Of nearly the same frequency |
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(c) Of the same frequency |
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(d) Of different wavelengths |
The amount of substance liberated on electrodes during electrolysis when 1 coulomb of electricity is passed, is
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(a) Chemical equivalent |
(b) Electrochemical equivalent |
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(c) Equivalent weight |
(d) One mol |