- AThe work function of the metal.
- BIntensity of incident radiation.
- CThe saturation current for the given frequency.
- DThe kinetic energy gained by the photoelectrons.
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Assertion : V-i characteristic of P-N junction diode is same as that of any other conductor.
Reason : P-N junction diode behave as conductor at room temperature.
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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. |
When a current is passed through water, acidified with a dilute sulphuric acid, the gases formed at the platinum electrodes are
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(a) 1 vol. hydrogen (cathode) and 2 vol. oxygen (anode) |
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(b) 2 vol. hydrogen (cathode) and 1 vol. oxygen (anode) |
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(c) 1 vol. hydrogen (cathode) and 1 vol. oxygen (anode) |
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(d) 1 vol. oxygen (cathode) and 2 vol. hydrogen (anode) |
Magnifying power of a simple microscope is (when final image is formed at D = 25 cm from eye)
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(a) |
(b) 1 + |
(c) |
(d) |
When a hydrogen atom is raised from the ground state to an excited state
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(a) P.E. increases and K.E. decreases |
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(b) P.E. decreases and K.E. increases |
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(c) Both kinetic energy and potential energy increase |
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(d) Both K.E. and P.E. decrease |
With a potentiometer null point were obtained at 140 cm and 180 cm with cells of emf 1.1 V and one unknown X volts. Unknown emf is
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(a) 1.1 V |
(b) 1.8 V |
(c) 2.4 V |
(d) 1.41 V |
An ionic atom equivalent to hydrogen atom has wavelength equal to 1/4 of the wavelengths of hydrogen lines. The ion will be
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(a) |
(b) |
(c) |
(d) |
The output current versus time curve of a rectifier is shown in the figure. The average value of the output current in this case is
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(a) 0 |
(b) i0/p |
(c) 2i0/p |
(d) i0 |