141 Which experiment shows that wavelength of light is smaller than that of sound___________________? Physics Medium Full question → A Diffraction B Polarization C Interference D Reflection
142 Gives the definition of metre in terms of wavelength of red cadmium light ___________________? Physics Medium Full question → A Newton B Einstein C Michelson D Galileo
143 A thing that emits its own light is___________________? Physics Medium Full question → A luminous B non-luminous C incandescent D bright
144 Diffraction fringes are____________________? Physics Medium Full question → A equally spaced B distance between them increases C distance between then decreases D they are adjacent with no space in between
145 Light on passing through a Polaroid is ___________________? Physics Medium Full question → A plane polarized B un-polarized C circularly polarized D elliptically polarized
146 A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________? Physics Medium Full question → A 500 mm B 5 x 10-3 mm C 2 x 10-5 mm D 2 x 10-3 mm
147 Diffraction effect is____________________? Physics Medium Full question → A more for a round edge B less for a round edge C more for a sharp edge D less for a sharp edge
148 A light ray traveling form rarer to denser medium suffers a phase change of__________________? Physics Medium Full question → A 60° B 90° C 180° D 45°
149 appearance of colour in thin films is due to ____________________? Physics Medium Full question → A diffraction B dispersion C interference D polarization
150 The velocity of light was determined accurately by_______________? Physics Medium Full question → A Newton B Michelson C Huygen D Young
151 Two sources of light are coherent if they emit rays of_______________? Physics Medium Full question → A same wavelength B same amplitude of vibration C same wave length with constant phase difference D same amplitude and wavelength
152 The locus of all points in a medium having the same phase of vibration is called____________________? Physics Medium Full question → A crest B trough C wavelength D wave front
153 Central spot of Newtons rings __________________? Physics Medium Full question → A bright B dark for large wavelength C dark D bright for large wavelength
154 According to Einstein light travels form one place to another in the form of ________________? Physics Medium Full question → A waves B particles C photons D it was not his discovery
155 Light reaches the earth form sun in nearly____________________? Physics Medium Full question → A 15 minutes B 10 minutes C 8 minutes D 8 minutes 30 seconds
156 When light incident normally on thin film the path difference depends upon ________________? Physics Medium Full question → A thickness of the film only B nature of the film only C angle of indidence only D all thickness nature and angle of incidence
157 Which is not optically active ? Physics Medium Full question → A sugar B tartaric acid C water D sodium chlorate
158 Crystals of a material can behave as_________________? Physics Medium Full question → A Convex lens B Interferometer C Diffraction grating D Concave
159 In the shadow of a ball the central portion appears bright that happens due to_________________? Physics Medium Full question → A Interference B Diffraction C Polarization D Refraction
160 In double slit experiment if one of the two slit is covered then________________? Physics Medium Full question → A no interference fringes are observed B no diffraction fringes are observed C no fringes observed D interference pattern not disturbed