Physics MCQs

Page No. 62

Which one of the following cannot be polarized ?


aradio waves


bultraviolot rays


cX-rays


dsound waves


View Answer sound waves

In a plane polarized light _________________?


a vibration in all direction


b vibration in two mutually perpendicular directions


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


dno vibration at all



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


b2 x 10-10 m


c0.02×10-10m


d20×10-10m


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


b5000A


c500m


d2000um


View Answer 5000A

The blue colour of the sky is due to___________________?


adiffraction


breflection


cpolarization


dscattering


View Answer scattering

In an interference pattern______________________?


abright fringes are wider than dark fringes


bdark fringes are wider than bright fringe


cboth dark and bright fringes are of equal width


dcentral fringes are brighter than the outer fringes



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


a alternate dark and bright fringes will be seen


bcoloured fringes will be seen


cno interference fringes will be seen


d impossible to predict



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


apolarization


bconstructive interference


cdestructive interference


ddiffraction



Which one of the following is nearly monochromatic light ?


alight form fluorescent tube


blight form neon lamp


clight form sodium lamp


dlight form simple lamp



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


a a cylindrical wave front


ban elliptical wave front


ca spherical wave front


d a plane wave front



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