12th physics chapter 10 Bihar board with NCERT-Details & Highlights
| name of content | 12th physics chapter 10 full solution |
| content | physics objective type MCQ question with answer |
| name of subjects | class 12 physics |
| important for exam | Bihar board & other state board |
| pattern & Level | NCERT & State level question |
12th physics chapter 10 all objective solutions – download PDF
1. The idea of secondary wavelets for the. propagation of a wave was first given by
-
- (A) Newton
- (B) Huygens
- (C) Maxwell
- (D) Fresnel
Answer: (B) Huygens
2. Light propagates rectilinearly, due to
-
- (A) wave nature
- (B) wavelengths
- (C) velocity
- (D) frequency
Answer: (A) wave nature
3. Which of the following is correct for light diverging from a point source?
-
- (A) The intensity decreases in proportion with the distance squared.
- (B) The wavefront is parabolic.
- (C) The intensity at the wavelength does not depend on the distance.
- (D) None of these.
Answer: (A) The intensity decreases in proportion with the distance squared.
4. The refractive index of glass is 1.5 for light waves of X = 6000 A in vacuum. Its wavelength in glass is
-
- (A) 2000 Å
- (B) 4000 Å
- (C) 1000 Å
- (D) 3000 Å
Answer: (B) 4000 Å
5. The phenomena which is not explained by Huygen’s construction of wavefront
-
- (A) reflection
- (B) diffraction
- (C) refraction
- (D) origin of spectra
Answer: (D) origin of spectra
6. A laser beam is used for locating distant objects because
-
- (A) it is monochromatic
- (B) it is not chromatic
- (C) it is not observed
- (D) it has small angular spread.
Answer: (D) it has small angular spread.
7. Two slits in Young’s double slit experiment have widths in the ratio 81 :1. The ratio of the amplitudes of light waves is
-
- (A) 3 :1
- (B) 3 : 2
- (C) 9 :1
- (D) 6:1
Answer: (C) 9 :1
8. When interference of light takes place
-
- (A) energy is created in the region of maximum intensity
- (B) energy is destroyed in the region of maximum intensity
- (C) conservation of energy holds good and energy is redistributed
- (D) conservation of energy does not hold good
Answer: (C) conservation of energy holds good and energy is redistributed
- In a double slit interference pattern, the first maxima for infrared light would be
-
- (A) at the same place as the first maxima for green light
- (B) closer to the centre than the first maxima for green light
- (C) farther from the centre than the first maxima for green light
- (D) infrared light does not produce an interference pattern
Answer: (C) farther from the centre than the first maxima for green light
10. To observe diffraction, the size of the obstacle
-
- (A) should beX/2, where X is the wavelength.
- (B) should be of the order of wavelength.
- (C) has no relation to wavelength.
- (D) should be much larger than the wavelength.
Answer: (B) should be of the order of wavelength.
bihar board most mcq solution 12th physics chapter 10
11. The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 A is of the order of
-
- (A) 106 rad
- (B) 10-2 rad
- (C) 10-4 rad
- (D) 10-6 rad
Answer: (D) 10-6 rad
12. An optically active compound
-
- (A) rotates the plane of polarised light
- (B) changes the direction of polarised light
- (C) does not allow plane polarised light to pass through
- (D) none of these
Answer: (A) rotates the plane of polarised light
13. The reason of blue colour of the sky is
-
- (A) scattering
- (B) interference
- (C) Polarization
- (D) diffraction
Answer: (A) scattering
14. 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) Fraunofer lines
15. Pure spectrum can be obtained using
-
- (A) microscope
- (B) spherometer
- (C) spectrometer
- (D) prism only
Answer: (C) spectrometer
16. 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) red
17. 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) at infinite distance form the source
18. 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) a single plane
19. 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) interference of light
20. 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) Fresnel’s biprism
bseb important objective solution 12th physics chapter 10
21. 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) new geometrical position of the wavefront
22. Light consists of vibrations of
-
- (A) Ether particles
- (B) air particles
- (C) electric and magnetic fields
- (D) None of these
Answer: (C) electric and magnetic fields
23. 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) frequency
24. The concept of secondary wavelets was given by
-
- (A) Fresnel
- (B) Maxwell
- (C) Huygens
- (D) Newton
Answer: (C) Huygens
25. 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) unpolarized
26. 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) they have constant phase difference
27. 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) Brewster’s law
28. 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) gets doubled to
29. The colour of a thin film is due to
-
- (A) scattering
- (B) interference
- (C) dispersion
- (D) diffraction
Answer: (C) dispersion
30. Optical fibre communication is based on which of the following phenomena :
-
- (A) Total Internal reflection
- (B) Scattering
- (C) Reflection
- (D) Interference
Answer: (A) Total Internal reflection
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Bihar board 12th physics chapter 10 complete objective
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Bihar board 12th science stream subjects wise solution
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| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |