- ATwo diodes
- BThree diodes
- CFour diodes
- DFive diodes
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Stars are twinkling due to
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(a) Diffraction |
(b) Reflection |
(c) Refraction |
(d) Scattering |
To explain his theory, Bohr used
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(a) Conservation of linear momentum |
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(b) Conservation of angular momentum |
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(c) Conservation of quantum frequency |
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(d) Conservation of energy |
Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly
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(a) 9.61 |
(b) 4.12 |
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(c) 1.51 |
(d) 2.13 |
Assertion : In Millikan's experiment for the determination of charge on an electron, oil drops of any size can be used.
Reason : Millikan's experiment determine the charge on electron, by simply measuring the terminal velocity.
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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. |
A parallel plate capacitor of plate separation 2 mm is connected in an electric circuit having source voltage 400 V. if the plate area is 60 cm2, then the value of displacement current for will be
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(a) 1.062 amp |
(b) 1.062 |
(c) 1.062 |
(d) 1.062 |
Fraunhofer lines are produced by
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(a) The element present in the photosphere of sun |
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(b) The elements present in the chromosphere of the sun |
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(c) The vapour of the element present in the chromosphere of the sun |
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(d) The carbon dioxide present in the atmosphere |