MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Part-1 with Answers

Ray Optics and Optical Instruments Part-1 Class 12 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments 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 Ray Optics and Optical Instruments Part-1 Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 12 Physics Chapter 9 Quiz

Class 12 Physics Chapter 9 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Ray Optics and Optical Instruments Part-1 Class 12 Physics MCQ online test

Q1.	Which of-the following is not a property of light?
	A.It can travel through vacuum
	B.It has a finite speed
	C.It requires a material medium for its propagation
	D.It involve transportation energy

Ans: It requires a material medium for its propagation

Q2.	Two points P and q are situated at the same distance from a source of light but on opposite sides. The plane difference between the light waves passing through P and q will be:
	A.n
	B.2n
	C.\(\frac{π}{2}\)
	D.zero

Ans: zero

Q3.	The phase difference between the electric and the magnetic field vectors in electromagnetic waves is
	A.\(\frac{π}{4}\)
	B.\(\frac{π}{2}\)
	C.π
	D.zero

Ans: zero

Q4.	A ray of light travelling in air is incident of a glass slab. The ray gets partly reflected and partly refracted. The phase difference between the reflected and the refracted waves is :
	A.\(\frac{π}{2}\)
	B.\(\frac{π}{4}\)
	C.π
	D.zero

Ans: π

Q5.	Which of the following cannot be polarised?
	A.radiowaves
	B.transverse waves
	C.sound waves
	D.X-rays

Ans: sound waves

Q6.	Light year is the unit of:
	A.distance
	B.time
	C.intensity of light
	D.None of these

Ans: distance

Q7.	If a mirror is approaching you at a speed of 10 ms^1, the speed with which your image approach you is:
	A.10 ms^-1
	B.5 ms^-1
	C.20 ms^-1
	D.15 ms^-1

Ans: 20 ms^-1

Q8.	The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to w ater is:
	A.8/9
	B.9/8
	C.7/6
	D.2

Ans: 9/8

Q9.	The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:
	A.\(\frac{1}{√3}\)
	B.√2
	C.1
	D.can’t be determined

Ans: √2

Q10.	A beam of light is incident at 60° to a plane surface. The reflected and refracted rays are perpendicular to each other. What is the R.I. of the surface:
	A.\(\frac{1}{√3}\)
	B.√3
	C.\(\frac{1}{3}\)
	D.3

Ans: √3

Q11.	A concave mirror of focal length f produces an image n times the size of the object. If the image is real then the distance of the object is:
	A.(n – 1) f
	B.(n + 1) f
	C.(\(\frac{n+1}{n}\))f
	D.(\(\frac{n-1}{n}\))f

Ans: (\(\frac{n+1}{n}\))f

Q12.	A convergent lens will become less convergent in :
	A.oil
	B.water
	C.both of (a) and (b)
	D.none of these

Ans: water

Q13.	A thin glass (RI = \(\frac{3}{2}\)) lens has optical power of – 5D in air. Its optical power in a liquid medium with RI = 1.6 will be:
	A.-2.5 D
	B.25 D
	C.-ID
	D.0.625 D

Ans: 0.625 D

Q14.	On reflection from a denser medium, a light wave suffers a phase difference of:
	A.π
	B.\(\frac{π}{2}\)
	C.\(\frac{π}{4}\)
	D.2π

Ans: π

Q15.	The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:
	A.geometrical optics
	B.physical optics
	C.corpuscular optics
	D.quantum optics

Ans: quantum optics

Q16.	When light travels from one medium to another, which of the following does not change?
	A.frequency
	B.refractive index
	C.velocity
	D.wavelength

Ans: frequency

Q17.	Two lens of power -15 D and +5 D are placed in contact co-axially. The focal length of equivalent lens is:
	A.-10 cm
	B.-20 cm
	C.+10 cm
	D.None

Ans: -10 cm

Q18.	Refractive index of water and glass are \(\frac{4}{3}\) and \(\frac{5}{3}\). A light ray is going to water from glass. Then, its critical angle will be:
	A.sin^-1\(\frac{4}{5}\)
	B.sin^-1\(\frac{5}{6}\)
	C.sin^-1\(\frac{1}{2}\)
	D.sin^-1(\(\frac{2}{1}\))