12th Physics Question

Class 12th Physics Chapter 10 Wave Optics VVI Objective Question

Wave Optics

1. Electromagnetic wave can be Polarised by 

(A) a lens 

(B) a mirror

(C) a polaroid 

(D) a prism 

Answer:- C

2. Bonding of light rays at sharp obstacles is called : 

(A) Refraction 

(B) Diffraction

(C) Interference

 (D) Polarisation

Answer:- B

3. If the ratio of amplitudes of two interfering waves is 4:3, then the ratio of maximum and minimum intensity is :

(A) 16:9 

(B) 9:16

(C) 49:1 

(D) 1:49 

Answer:- C

4. Which of the following could not be explained by wave nature of light? 

(A) Reflection de

(B) Refraction 

(C) Diffraction

(D) Photo-electric effect

Answer:- D

5. The phenomenon which exhibits that a certain wave is transverse is :

(A) Dispersion

(B) Diffraction 

(C) Interference

(D) Polarization

Answer:- D

6. A rainbow is a natural example of 

(A) refraction of light

(B) reflection of light

(C) refraction, reflection and dispersion of light

(D) None of these 

Answer:- C

7. Electromagnetic waves can be polarized by 

(A) Lens 

(B) mirror

(C) polaroid 

(D) prism 

Answer:- C

8. When a ray of light enters a glass slab its wavelength 

(A) decreases 

(B) increases

(C) remains unchanged

(D) data is not sufficient 

Answer:- D

9. Cause of mirage is 

(A) refraction and total internal reflection

(B) diffraction

(C) scattering 

(D) interference 

Answer:- A

10. The reason of blue colour of the sky is 

(A) scattering 

(B) interference

(C) Polarization

(D) diffraction 

Answer:- A

11. The dark lines in solar spectrum are known as 

(A) Fraunofer lines

(B) Telluric lines

(C) Both (A) and (B)

(D) None of these

Answer:- A

12. Pure spectrum can be obtained using 

(A) microscope

(B) spherometer

(C) spectrometer

(D) prism only 

Answer:- C

13. In the spectrum of white light obtained by a prism, the colour showing minimum deviation is 

(A) yellow

(B) red

(C) blue

(D) violet

Answer:- B

14. In Fraunhofer class of diffraction, the source of light is placed 

(A) at finite distance from the obstacle

(B) in close contact with the source

(C) at infinite distance form the source

(D) None of these 

Answer:- C

15. In a plane polarised light, the vector of electric field intensity vibrate in

(A) all directions

(B) a single plane

(C) mutually perpendicular directions

(D) None of these 

Answer:- B

16. A soap bubble appears colourful in white light because of 

(A) polarization of light

(B) scattering of light 

(C) refraction of light

(D) interference of light

Answer:- D

17. Two virtual and coherent sources are produced in 

(A) Young’s double-slit experiment

(B) Lyod mirror 

(C) Fresnel’s biprism

(D) all of these

Answer:- C

18. Huygens secondary wave principle is used to 

(A) new geometrical position of the wavefront

(B) explain the superposition principle of waves

(C) explain the interference of light

(D) explain the polarization of light 

Answer:- A

19. Light consists of vibrations of 

(A) Ether particles

(B) air particles 

(C) electric and magnetic fields

(D) None of these 

Answer:- C

20. According to wave motion-theory of light, the colour of light is decided by

(A) amplitude

 (B) speed of wave 

(C) frequency

(D) wavelength

Answer:- C

21. The concept of secondary wavelets was given by 

(A) Fresnel 

(B) Maxwell

(C) Huygens 

(D) Newton

Answer:- C

22. When a polaroid is rotated about the incident beam, the intensity of light passed does not change. It so happens when the incident beam of light is

(A) fully plane polarized

(B) partly plane polarized

(C) unpolarized

(D) None of these

Answer:- C

23. Two sources of waves are said to be coherent of 

(A) their amplitudes are equal

(B) they produce waves of equal wavelengths

(C) they produce waves of equal velocities 

(D) they have constant phase difference

Answer:- D

24. The tangent of polarization angle is equal to the refractive index. This law is known as

(A) Malus law

(B) Brewster’s law 

(C) Bragg’s law

(D) Compton’s law

Answer:- B

25. If the wavelength of light in Young’s experiment is doubled, the fringe width

(A) remains the same

(B) gets doubled to 

(C) is halved

(D) is quadrupled

Answer:- B

26. The colour of a thin film is due to 

(A) scattering 

(B) interference

(C) dispersion

(D) diffraction

Answer:- C

27. Optical fibre communication is based on which of the following phenomena :

(A) Total Internal reflection

(B) Scattering

(C) Reflection

(D) Interference 

Answer:- A

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