Physics MCQs

Page No. 62

Which one of the following cannot be polarized ?


aradio waves

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bultraviolot rays

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cX-rays

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dsound waves

✓


View Answer sound waves

In a plane polarized light _________________?


a vibration in all direction

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b vibration in two mutually perpendicular directions

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cvibration take place in a direction perpendicular to the direction of propagation of light

✓


dno vibration at all

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Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is________________?


a4 x 10-10 m

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b2 x 10-10 m

✓


c0.02×10-10m

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d20×10-10m

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View Answer 2 x 10-10 m

When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used ?


a5000 nm

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b5000A

✓


c500m

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d2000um

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View Answer 5000A

The blue colour of the sky is due to___________________?


adiffraction

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breflection

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cpolarization

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dscattering

✓


View Answer scattering

In an interference pattern______________________?


abright fringes are wider than dark fringes

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bdark fringes are wider than bright fringe

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cboth dark and bright fringes are of equal width

✓


dcentral fringes are brighter than the outer fringes

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In Young double slit experiment, if white light is used____________________?


a alternate dark and bright fringes will be seen

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bcoloured fringes will be seen

✓


cno interference fringes will be seen

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d impossible to predict

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When crest of one wave falls over the trough of the other wave this phenomenon is known as________________?


apolarization

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bconstructive interference

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cdestructive interference

✓


ddiffraction

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Which one of the following is nearly monochromatic light ?


alight form fluorescent tube

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blight form neon lamp

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clight form sodium lamp

✓


dlight form simple lamp

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A point source of light placed in a homogeneous medium gives rise to ___________________?


a a cylindrical wave front

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ban elliptical wave front

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ca spherical wave front

✓


d a plane wave front

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