Wave Optics MCQ Questions for Class 12 Physics Chapter 10 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Physics book Chapter 10 with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Wave Optics. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

NCERT MCQ Chapters for Class 12 Physics

Q1. The phenomena which is not explained by Huygen’s construction of wavefront

(i) reflection
(ii) diffraction
(iii) refraction
(iv) origin of spectra

(iv) origin of spectra

Q2. When a polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that the incident light is:

(i) unpolarised
(ii) completely plane polarised
(iii) partially plane polarised
(iv) None of the above

(iii) partially plane polarised

Q3. In a Young’s doubles-slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case

(i) there shall be alternate interference patterns of red and blue.
(ii) there shall be an interference pattern for red distinct from that for blue.
(iii) there shall be no interference fringes.
(iv) there shall be an interference pattern for red mixing with one for blue.

(iii) there shall be no interference fringe

Q4. Wavefront is the locus of all points, where the particles of the medium vibrate with the same

(i) phase
(ii) amplitude
(iii) frequency
(iv) period

(i) phase

Q5. Identify the condition which is not necessary for two light waves to be coherent.

(i) The two waves must be continuous
(ii) The two waves should be of the same frequency or wavelength
(iii) They should have a constant or zero phases difference
(iv) They two light sources should be narrow

(iv) They two light sources should be narrow

Q6. The interfering fringes formed by a thin oil film on water are seen in yellow light of sodium lamp. We find the fringes

(i) coloured
(ii) black and white
(iii) yellow and black
(iv) coloured without yellow

(i) coloured

Q7. The refractive index of glass is 1.5 for light waves of X = 6000 A in vacuum. Its wavelength in glass is

(i) 2000 Å
(ii) 4000 Å
(iii) 1000 Å
(iv) 3000 Å

(ii) 4000 Å

Q8. A single slit diffraction pattern is obtained using a beam of red light What happened the red light is replaced by the blue light?

(i) There is no change in diffraction pattern
(ii) Diffraction fringes become narrower and crowded
(iv) Diffraction fringes become broader and farther apart
(iv) The diffraction pattern disappear

(ii) Diffraction fringes become narrower and crowded

Q9. An interference pattern is observed by Young’s double-slit experiment. If now the separation between coherent sources is halved and the distance of screen from coherent sources is doubled, then fringe width

(i) becomes double
(ii) becomes one-fourth
(iii) remains same
(iv) becomes four times

(iv) becomes four times

Q10. Which of the following is correct for light diverging from a point source?

(i) The intensity decreases in proportion for the distance squared.
(ii) The wavefront is parabolic.
(iii) The intensity at the wavelingth does depend of the distance.
(iv) None of these.

(i) The intensity decreases in proportion for the distance squared.

Q11. The wavelength of light coming from a sodium source is 589 nm. What will be its wavelength in the water?

(i) 625 nm
(ii) 443 nm
(iii) 789 nm
(iv) 125 nm

(ii) 443 nm

Q12. The fringe width in a Young’s double slit experiment can be increased if we decrease

(i) width of slits
(ii) separation of slits
(iii) wavelength of light used
(iv) distance between slits and screen

(ii) separation of slits

Q13. Light propagates rectilinearly, due to

(i) wave nature
(ii) wavelengths
(iii) velocity
(iv) frequency

(i) wave nature

Q14. What happens to the interference pattern the two slits S1 and S2 in Young’s double experiment are illuminated by two independent but identical sources?

(i) The intensity of the bright fringes doubled
(ii) The intensity of the bright fringes becomes four times
(iii) Two sets of interference fringes overlap
(iv) No interference pattern is observed

(iv) No interference pattern is observed

Q15. The locus of all particles in a medium, vibrating in the same phase is called

(i) wavelet
(ii) fringe
(iii) wave front
(iv) None of these

(iii) wave front

Q16. A light wave enters from air into glass. How will the energy of the wave be affected?

(i) Decreases
(ii) Increases
(iii) Remains the same
(iv) Independent

(i) Decreases

Q17. The locus of all particles in a medium, vibrating in the same phase is called

(i) wavelet
(ii) fringe
(iii) wave front
(iv) None of these

(iii) wave front

Q18. The idea of secondary wavelets for the. propagation of a wave was first given by

(i) Newton
(ii) Huygens
(iii) Maxwell
(iv) Fresnel

(ii) Huygens

Q19. For sustained interference, we need two sources which emit radiations :

(i) of the same intensity
(ii) of the same amplitude
(iii) having a constant phase difference
(iv) None of these

(iii) having a constant phase difference

Q20. When light suffers reflection at the interface between water and glass, the change of phase in the reflected wave is

(i) zero
(ii) π
(iii) π/2
(iv) 2π

(ii) π

Q21. If a wave undergoes refraction, what will be the phase change?

(i) 180°
(ii) 270°
(iii) 90°
(iv) 0°

(iv) 0°

Q22. Wavefront is the locus of all points, where the particles of the medium vibrate with the same

(i) phase
(ii) amplitude
(iii) frequency
(iv) period

(i) phase

Q23. Two slits in Young’s double slit experiment have widths in the ratio 81 :1. The ratio of the amplitudes of light waves is

(i) 3 :1
(ii) 3 : 2
(iii) 9 :1
(iv) 6:1

(iii) 9 :1

Q24. Poisson’s bright spot was discovered by:

(i) Fresnel
(ii) Rayleigh
(iii) Poisson
(iv) Fraunhoffer

(iii) Poisson

Q25. If two coherent sources are vibrating in phase then we have constructive interference at any point P whenever the path difference is

(i) (n+1/2)λ
(ii) nλ/2
(iii) (n-1/2)λ
(iv) nλ

(iv) nλ

Q26. When a wave undergoes reflection at a denser medium, what will be the phase change?

(i) 2π radian
(ii) 0
(iii) π radian
(iv) 3π radian

(iv) 3π radian

Q27. When light suffers reflection at the interface between water and glass, the change of phase in the reflected wave is

(i) zero
(ii) π
(iii) π/2
(iv) 2π

(ii) π

Q28. The velocity of light in air is 3 * 108 ms-1 and that in water is 2.2 * 108 ms” . The polarising angle of incidence is

(i) 45°
(ii) 50°
(iii) 53.74°
(iv) 63

(iv) 3π radian

Q29. The angle of minimum deviation of a prism depends upon the aggie of:

(i) incidence
(ii) reflection
(iii) prism
(iv) none of these

(iii) prism

Q30. The device which produces highly coherent sources is

(i) Fresnel biprism
(ii) Young’s double slit
(iii) Laser
(iv) Lloyd’s mirror

(iii) Highly coherent sources are produced using laser.

Q31. A small circular disc is placed in the path of light from a distant source. Identify the nature of the fringe produced.

(i) Dual
(ii) Narrow
(iii) Dark
(iv) Bright

(iv) Bright

Q32. The device which produces highly coherent sources is

(i) Fresnel biprism
(ii) Young’s double-slit
(iii) Laser
(iv) Lloyd’s mirror

(iii) Laser

Q33. The minimum value of the refractive index is:

(i) zero
(ii) 1
(iii) less than 1 but not zero
(iv) more than 1

(iii) less than 1 but not zero

Q34. Coherence is a measure of

(i) capability of producing interference by wave
(ii) waves being diffracted
(iii) waves being reflected
(iv) waves being refracted

(i) capability of producing interference by wave

Q35. Which type of waves shows the property of polarization?

(i) Infrared
(ii) Longitudinal
(iii) Transverse
(iv) Microwave

(iii) Transverse

Q36. Intensity of light depends on

(i) amplitude
(ii) frequency
(iii) wavelength
(iv) velocity

(i) amplitude

Q37. In Young’s double slit experiment, the central point on the screen is:

(i) bright
(ii) dark
(iii) first bright and later dark
(iv) first dark and later bright

(i) bright

Q38. The colour of bright fringe nearest to central achromatic fringe in the interference pattern with white light will be

(i) violet
(ii) red
(iii) green
(iv) yellow

(i) violet

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