MCQ Questions for Class 12 Physics Chapter 10 Wave Optics Part-1 with Answers

Wave Optics Part-1 Class 12 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Physics Chapter 10 Wave Optics Part-1 with Answers Pdf free download. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. We have Provided Wave Optics Part-1 Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 12 Physics Chapter 10 Quiz

Class 12 Physics Chapter 10 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Physics Chapter 10 Wave Optics Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Wave Optics Part-1 Class 12 Physics MCQ online test

Q1.	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

Ans: The bright fringes become less-bright and the dark fringes have a finite light intensity

Q2.	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

Ans: No interference pattern is observed

Q3.	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

Ans: There is not constant phase difference between the waves emitted by the two sources

Q4.	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

Ans: Diffraction fringes become narrower and crowded

Q5.	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

Ans: partially plane polarised

Q6.	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

Ans: unpolarised

Q7.	In Young’s double slit experiment, a maximum is obtained when the path difference between the interfering waves is (n ∈ l):
	A.nλ
	B.n \(\frac{λ}{2}\)
	C.(2n + 1) \(\frac{λ}{2}\)
	D.(2n – 1) \(\frac{λ}{4}\)

Ans: nλ

Q8.	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

Ans: having a constant phase difference

Q9.	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

Ans: wavelength and a constant phase difference

Q10.	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

Ans: 1 : 9

Q11.	Poisson’s bright spot was discovered by:
	A.Fresnel
	B.Rayleigh
	C.Poisson
	D.Fraunhoffer

Ans: Poisson

Q12.	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

Ans: red shift

Q13.	The application of Doppler effect are:
	A.Doppler spectrometer
	B.Doppler radius
	C.Doppler velocimeter
	D.All of these

Ans: All of these

Q14.	Which of the following is conserved when light waves interefere?
	A.phase
	B.intensity
	C.amplitude
	D.none of these

Ans: none of these

Q15.	In Young double slit experiment, a minimum is obtained when the phase difference of the superposing waves, is (n ∈ l):
	A.nπ
	B.(n + \(\frac{1}{2}\))π
	C.(2n + 1)π
	D.zero

Ans: (2n + 1)π

Q16.	The angle of minimum deviation of a prism depends upon the aggie of:
	A.incidence
	B.reflection
	C.prism
	D.none of these

Ans: prism

Q17.	he minimum value of the refractive index is:
	A.zero
	B.1
	C.less than 1 but not zero
	D.more than 1

Ans: less than 1 but not zero

Q18.	Polarization of light prove the :
	A.corpuscular nature of light
	B.quantum nature of light
	C.Transverse wave nature of light
	D.Longitudinal wave nature of light

Ans: Transverse wave nature of light

Q19.	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

Ans: When unpolarised light passes through Nicol’s prism, the emergent light is elliptically polarized

Q20.	Polaroid glasses is used in sun glasses because :
	A.It reduces the light intensity to half on account of polarization
	B.It is fashionable
	C.It has good colour
	D.It is cheaper