Academictask provides MCQs of Physics from Basic to Advance, so that you can prepare accordingly. Physics Mcqs section is useful for both students and job seekers i.e MCAT ECAT ETEA test preparation, PPSC Test, FPSC Test, SPSC Test, KPPSC Test, BPSC Test, other competitive and entry test preparations. Here you will find physics MCQs and answers with detailed explanations. MCQs of Physics include basic physics MCQs, Measurements MCQs, Vectors And Equilibrium MCQs, Work and Energy MCQs, Motion and Force MCQs, Circular Motion MCQs, Fluid Dynamics MCQs, Waves MCQs, Heat and Thermodynamics MCQs, Current Electricity MCQs, Electrostatics MCQs, Electromagnetism MCQs, Electromagnetic Induction MCQs, Alternating Current MCQs, Nuclear Physics MCQs, etc.

141. 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 ?

A. 5000 nm
B. 5000A
C. 500m
D. 2000um

142. 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________________?

A. 4 x 10-10 m
B. 2 x 10-10 m
C. 0.02×10-10m
D. 20×10-10m

143. In a plane polarized light _________________?

A. vibration in all direction
B. vibration in two mutually perpendicular directions
C. vibration take place in a direction perpendicular to the direction of propagation of light
D. no vibration at all

144. Which one of the following cannot be polarized ?

A. radio waves
B. ultraviolot rays
C. X-rays
D. sound waves

145. In monochromatic red light a blue book will probably appear to be_________________?

A. black
B. purple
C. green
D. no scientific reasoning available

146. In double slit experiment if one of the two slit is covered then________________?

A. no interference fringes are observed
B. no diffraction fringes are observed
C. no fringes observed
D. interference pattern not disturbed

147. In the shadow of a ball the central portion appears bright that happens due to_________________?

A. Interference
B. Diffraction
C. Polarization
D. Refraction

148. Crystals of a material can behave as_________________?

A. Convex lens
B. Interferometer
C. Diffraction grating
D. Concave

149. Which is not optically active ?

A. sugar
B. tartaric acid
C. water
D. sodium chlorate

150. When light incident normally on thin film the path difference depends upon ________________?

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

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