NCERT Solutions for class 12 Physics | Chapter 10 - Wave Optics

Sports GK Questions and Answers 2024 (Latest Updated)

Awards & Honours GK Questions 2024 (Latest Updated)

Questions
1 Out of the following Statements which is not correct?
A When unpolarised light passes through Nicol’s prism, the emergent light is elliptically polarized
B Nicol’s prism works on the principle of double refraction and T.l.R.
C Nicol’s prism can be used both the produce and analyse polarized light
D Calcite and Quartz are both double refracting crystal

Answer:When unpolarised light passes through Nicol’s prism, the emergent light is elliptically polarized
2 Which of the following is conserved when light waves interefere?
A phase
B intensity
C amplitude
D none of these

Answer:none of these
Advertisement
Article and Schedule Quiz Start Test!
DOWNLOAD CURRENT AFFAIRS PDF FROM APP
3 Poisson’s bright spot was discovered by:
A Fresnel
B Rayleigh
C Poisson
D Fraunhoffer

Answer:Poisson
4 When a polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that the incident light is:
A unpolarised
B completely plane polarised
C partially plane polarised
D None of the above

Answer:partially plane polarised
5 What is the reason for your answer to the above question?
A The two sources do not emit light of the same wavelength
B The two sources emit waves which travel with different speeds
C The two sources emit light waves of different amplitudes
D There is not constant phase difference between the waves emitted by the two sources

Answer:There is not constant phase difference between the waves emitted by the two sources
6 The intensity of light emerging from the two slits, in Young’s experiment is in the ratio 1 : 4. The ratio of,the intensity of the minimum to that of the consecutive maximum will be:
A 1 : 4
B 1 : 9
C 1 : 16
D 2 : 3

Answer:1 : 9
7 The theory of expanding universe is confirmed by the observation of the spectral lines of the star, which shows :
A green shift
B red shift
C violet shift
D yellow shift

Answer:red shift
8 When a polaroid is rotated, the intensity of light does not vary. The incident light may be:
A unpolarised
B completely polarised
C partially plane polarised
D None of the above

Answer:unpolarised
9 Two sources of light are said to be coherent when both give out light waves of the same:
A amplitude and phase
B intensity and wavelength
C speed
D wavelength and a constant phase difference

Answer:wavelength and a constant phase difference
10 A single slit diffraction pattern is obtained using a beam of red light What happened the red light is replaced by the blue light?
A There is no change in diffraction pattern
B Diffraction fringes become narrower and crowded
C Diffraction fringes become broader and farther apart
D The diffraction pattern disappear

Answer:Diffraction fringes become narrower and crowded
11 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?
A The intensity of the bright fringes doubled
B The intensity of the bright fringes becomes four times
C Two sets of interference fringes overlap
D No interference pattern is observed

Answer:No interference pattern is observed
12 For sustained interference, we need two sources which emit radiations :
A of the same intensity
B of the same amplitude
C having a constant phase difference
D None of these

Answer:having a constant phase difference
13 The application of Doppler effect are:
A Doppler spectrometer
B Doppler radius
C Doppler velocimeter
D All of these

Answer:All of these
14 The fringe width (β) of a diffraction pattern and the slit width d are related as: (c) β ∝ √d (d) β ∝ 1d2
A β ∝ d
B Class 12 Physics Chapter 10 Wave Optics
C β ∝ √d
D Class 12 Physics Chapter 10 Wave Optics

Answer:B
15 In Young double slit experiment, a minimum is obtained when the phase difference of the superposing waves, is (n ∈ l):\
A nπ
B Class 12 Physics Chapter 10 Wave Optics
C (2n + 1)π
D zero

Answer:(2n + 1)π
16 What happens if one of the slits, say S1 in Young’s double , slit experiment-is covered with a glass plate which absorbs half the intensity of light from it?
A The bright fringes become less-bright and the dark fringes have a finite light intensity
B The bright fringes become brighter and the dark fringes become darker
C The fringe width decreases
D No fringes will be observed

Answer:The bright fringes become less-bright and the dark fringes have a finite light intensity
17 Diffraction was discovered by :
A Grimaldi
B Thomas Young
C Malus
D Huygens

Answer:Grimaldi
18 In the above question, the number of the lens is:
A +2
B +1
C -2
D -1

Answer:+2
19 A young’s double slit experiment uses a monochromatic source. The shape of interference fringes formed on a screen is :
A parabola
B straight line
C circle
D hyperbola

Answer:straight line
20 A polaroid produces a strong beam of light which is :
A circularly polarised
B elliptically polarised
C plane polarised
D unpolarised

Answer:plane polarised

Chapters

Assam Direct Recruitment Test Series

Teacher Eligibility Test

Assam Direct Recruitment Test Series