NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 10 Wave Optics Sample Test,Sample questions

Question:
A monochromatic light is refracted from air into a glass of refractive index µ. The ratio of the wavelengths of the incident and the refracted waves is:

1.1 : µ

2.1 : µ²

3.µ : 1

4. µ² : 1


Question:
A person cannot see object clearly beyond 50 cm. The pow er of the lens to correct his vision is :

1.+0.5 dioptre

2. -0.5 dioptre

3.-2 dioptre

4.+2 dioptre


Question:
A phase difference of 5π corresponds to a path difference (in terms of λ) of:

1.5λ

2.10λ

3.5λ/2

4.2λ


Question:
A polaroid produces a strong beam of light which is :

1.circularly polarised

2.elliptically polarised

3.plane polarised

4.unpolarised


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

1.There is no change in diffraction pattern

2.Diffraction fringes become narrower and crowded

3. Diffraction fringes become broader and farther apart

4.The diffraction pattern disappear


Question:
A young’s double slit experiment uses a monochromatic source. The shape of interference fringes formed on a screen is :

1.parabola

2.straight line

3.circle

4.hyperbola


Question:
C.V. Raman was awarded the Nobel prize for his work associated with which of the following phenomenon of radiations?

1.scattering

2.diffraction

3.interference

4.polarisation


Question:
Diffraction was discovered by :

1.Grimaldi

2.Thomas Young

3.Malus

4.Huygens


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

1.of the same intensity

2.of the same amplitude

3.having a constant phase difference

4.None of the above


Question:
he minimum value of the refractive index is:

1.zero

2.1

3.less than 1 but not zero

4.more than 1


Question:
Images of a distant lamp seen through a fire cloth rotate on rotating the cloth. This is due to the phenomenon of:

1.interference

2.diffraction

3.polarisation

4.scattering


Question:
In a Young’s double slit experiment the distance between the slit is 1 mm and the distance of screen from the slit is 1 m. If light of wavelength 6000 A is used then the fringe width is:

1.0.4 mm

2.0.5 mm

3.0.6 mm

4.0.8 mm


Question:
In the above question, the number of the lens is:

1.+2

2.+1

3.-2

4.-1


Question:
In vacuum, the speed of light depends upon :

1.frequency

2.velocity

3.wave length

4.None of the these


Question:
In Young double slit experiment, a minimum is obtained when the phase difference of the superposing waves, is (n ∈ l):

1.nπ

2.(n + 12)π

3.(2n + 1)π

4.zero


Question:
In Young’s double slit experiment the distance between the slit and the screen is doubled and the separation between the slit is reduced to half. The fringe width:

1.is doubled

2.become four time

3.is halfed

4.remain unchanged


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

1.bright

2.dark

3.first bright and later dark

4.first dark and later bright


Question:
Light takes 10-10 to cross a glass slab. What is the thickness of the glass slab?

1.2 CM

2.3 CM

3.2.5 CM

4.3.5 CM


Question:
Out of the following Statements which is not correct?

1.When unpolarised light passes through Nicol’s prism, the emergent light is elliptically polarized

2.Nicol’s prism works on the principle of double refraction and T.l.R.

3. Nicol’s prism can be used both the produce and analyse polarized light

4.Calcite and Quartz are both double refracting crystal


Question:
Poisson’s bright spot was discovered by:

1.Fresnel

2.Rayleigh

3.Poisson

4.Fraunhoffer


Question:
Polarization of light prove the :

1.corpuscular nature of light

2.quantum nature of light

3.Transverse wave nature of light

4. Longitudinal wave nature of light


Question:
Polaroid glasses is used in sun glasses because :

1. It reduces the light intensity to half on account of polarization

2.It is fashionable

3.It has good colour

4.It is cheaper


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

1. incidence

2.reflection

3.prism

4.None of the above


Question:
The application of Doppler effect are:

1.Doppler spectrometer

2. Doppler radius

3.Doppler velocimeter

4.All the above


Question:
The electromagnetic wave theory of light fails to explain :

1.compton effect

2. photoelectric effect

3. neither (a) nor (b)

4. Both (a) and (b)


Question:
The focal length of the lens is 50 cm; then its power is:

1.+2D

2.+1D

3.-2D

4.-1D


Question:
The fringe width (β) of a diffraction pattern and the slit width d are related as:

1. β ∝ d

2.β ∝1d

3. β ∝ √d

4.β ∝ 1d2


Question:
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:

1.1 : 4

2.1 : 9

3.1 : 16

4. 2 : 3


Question:
The refractive index of diamond is about:

1.1

2.1.42

3.2.42

4.4.24


Question:
The theory of expanding universe is confirmed by the observation of the spectral lines of the star, which shows :

1.green shift

2.red shift

3.violet shift

4.yellow shift


Question:
Two lenses having power +6 D and -4 D are placed in contact. The power of the combination is

1. -2D

2.-4D

3. +4D

4.+2 D


Question:
Two sources of light are said to be coherent when both give out light waves of the same:

1. amplitude and phase

2.intensity and wavelength

3.speed

4.wavelength and a constant phase difference


Question:
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?

1. The bright fringes become less-bright and the dark fringes have a finite light intensity

2.The bright fringes become brighter and the dark fringes become darker

3.The fringe width decreases

4. No fringes will be observed


Question:
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?

1. The intensity of the bright fringes doubled

2.The intensity of the bright fringes becomes four times

3.Two sets of interference fringes overlap

4.No interference pattern is observed


Question:
What is the reason for your answer to the above question?

1.The two sources do not emit light of the same wavelength

2.The two sources emit waves which travel with different speeds

3. The two sources emit light waves of different amplitudes

4.There is not constant phase difference between the waves emitted by the two sources


Question:
When a polaroid is rotated, the intensity of light does not vary. The incident light may be:

1. unpolarised

2.completely polarised

3.partially plane polarised

4.None of the above


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

1.unpolarised

2.completely plane polarised

3. partially plane polarised

4.None of the above


Question:
Which of the following is conserved when light waves interefere?

1.phase

2.intensity

3.amplitude

4.None of the above


More MCQS

  1. NCERT Societal Impact MCQ
  2. MCQ Questions for Class 12 Maths Chapter 1 Relations and Functions
  3. MCQ Questions for Class 12 Physics Chapter 1 Electric Charges and Field
  4. MCQ Questions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance
  5. Current Electricity Class 12 MCQs Questions
  6. MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism
  7. MCQ Questions for Class 12 Physics Chapter 5 Magnetism and Matter
  8. MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction
  9. MCQ Questions for Class 12 Physics Chapter 7 Alternating Current
  10. MCQ Questions for Class 12 Physics Chapter 8 Electromagnetic Waves
  11. MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments
  12. MCQ Questions for Class 12 Physics Chapter 10 Wave Optics
  13. MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter
  14. MCQ Questions for Class 12 Physics Chapter 12 Atoms
  15. MCQ Questions for Class 12 Physics Chapter 13 Nuclei
  16. MCQ Questions for Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits
  17. MCQ Questions for Class 12 Physics Chapter 15 Communication Systems
  18. MCQ Questions for Class 12 English
  19. MCQ Questions for Class 12 English Flamingo Chapter 3 Deep Water
  20. MCQ Questions for Class 12 English Flamingo Chapter 4 The Rattrap
  21. Human Geography: Nature and Scope Class 12 MCQs Questions
  22. MCQ Questions for Class 12 Geography Chapter 2 The World Population: Distribution, Density and Growth
Search
R4R Team
R4Rin Top Tutorials are Core Java,Hibernate ,Spring,Sturts.The content on R4R.in website is done by expert team not only with the help of books but along with the strong professional knowledge in all context like coding,designing, marketing,etc!