MCQ
A photosensitive substance emits _____when illuminated by light:
- AOnly protons.
- BOnly neutrons.
- CElectrons and protons.
- DOnly electrons.
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A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointing in the same direction
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(a) The electron will turn to its right |
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(b) The electron will turn to its left |
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(c) The electron velocity will increase in magnitude |
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(d) The electron velocity will decrease in magnitude |
The image which can not be taken on the screen is called:
In Young’s double slit experiment the wavelength of light was changed from 7000 Å to 3500 Å. While doubling the separation between the slits which of the following is not true for this experiment
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(a) The width of the fringes changes |
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(b) The colour of bright fringes changes |
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(c) The separation between successive bright fringes changes |
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(d) The separation between successive dark fringes remains unchanged |
The characteristic X-ray radiation is emitted, when
| (a) The electrons are accelerated to a fixed energy |
| (b) The source of electrons emits a monoenergetic beam |
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(c) The bombarding electrons knock out electrons from the inner shell of the target atoms and one of the outer electrons falls into this vacancy |
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(d) The valence electrons in the target atoms are removed as a result of the collision |
A metallic sheet is inserted between the plates of a parallel plate capacitor. The capacitance of the capacitor
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(a) Increases |
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(b) Is independent of the position of the sheet |
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(c) Is maximum when the metal sheet in the middle |
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(d) a, b |