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

1.1 : µ

2.1 : µ²

3.µ : 1

4. µ² : 1

1.+0.5 dioptre

2. -0.5 dioptre

3.-2 dioptre

4.+2 dioptre

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

1.parabola

2.straight line

3.circle

4.hyperbola

1.scattering

2.diffraction

3.interference

4.polarisation

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

1.interference

2.diffraction

3.polarisation

4.scattering

1.0.4 mm

2.0.5 mm

3.0.6 mm

4.0.8 mm

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

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

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

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

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)

1.+2D

2.+1D

3.-2D

4.-1D

1. β ∝ d

2.β ∝1d

3. β ∝ √d

4.β ∝ 1d2

1.1 : 4

2.1 : 9

3.1 : 16

4. 2 : 3

1.1

2.1.42

3.2.42

4.4.24

1.green shift

2.red shift

3.violet shift

4.yellow shift

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

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