MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Part-2 with Answers

Ray Optics and Optical Instruments Part-2 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-2 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-2 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-2 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-2 Class 12 Physics MCQ online test

Q1.	Radio waves from an antenna travel with the velocity of:
	A.light
	B.sound
	C.ultrasonics
	D.supersonics

Ans: light

Q2.	A point object is placed at the centre of a glass sphere of radius 6 cm 3 and RI = \(\frac{3}{2}\). The distance of virtual image from the surface of the sphere is :
	A.2 cm
	B.4 cm
	C.6 cm
	D.12 cm

Ans: 4 cm

Q3.	The RI. of the material of a prism is √2 and its refracting angle is 30°. One of the refracting surface of the prism is made a mirror. A beam of monochromatic light entering the prism from the other face retraces its path, after reflection from mirror surface. The angle of incidence on prism is:
	A.0°
	B.30°
	C.45°
	D.60°

Ans: 45°

Q4.	A telescope has an objective lens of 10 cm diameter and is situated at a distance of 1 km from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when seen in the light of mean λ = 5000 A is of the order of:
	A.5 mm
	B.5 cm
	C.0.5 m
	D.5 m

Ans: 5 mm

Q5.	When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is :
	A.polarized
	B.of longer λ
	C.of shorter λ
	D.of high intensity

Ans: of shorter λ

Q6.	A convex lens is dipped in a liquid, whose R.I. is equal to that of R.I. of material of the lens. Then its focal length will:
	A.become zero
	B.become infinite
	C.reduce
	D.increase

Ans: become infinite

Q7.	The velocity of light in vacuum is 3 × 10¹⁰ cms^-1. The velocity of light in a medium (µ = 1.5) is:
	A.2 × 10¹⁰cms^-1
	B.4.5 × 10¹⁰cms^-1
	C.1.5 × 10¹⁰cms^-1
	D.None of these

Ans: 2 × 10¹⁰cms^-1

Q8.	Which of the following is not essential for the formation of a pure spectrum?
	A.parallel beam of light
	B.narrow beam of light
	C.screen
	D.prism in the minimum deviation position

Ans: screen

Q9.	A certain far-sighted person cannot see objects closer to the eye than 100 cm. The power of the lens which will enable him to read at a distance of 25 cm will be?
	A.3D
	B.1D
	C.4D
	D.2D

Ans: 3D

Q10.	Which produces additional luminiscence in a fluorescent tube?
	A.infra red rays
	B.ultraviolet rays
	C.micro waves
	D.radio waves

Ans: ultraviolet rays

Q11.	For achromatic combination of lenses, if we use two lenses of focal length f’ and f₁ dipersive power to ω and ω’ respectively, then
	A.ω = ω₀, ω’= 2ω₀, f’ = 2f
	B.ω = ω₀, ω’ = 2ω₀, f’ = -2f
	C.ω = ω₀, ω’ = 2ω₀, f’ = f/2
	D.ω = ω₀, ω’ = 2ω₀, f’ = -f/2

Ans: ω = ω₀, ω’ = 2ω₀, f’ = -f/2

Q12.	ar point of a myopic eye is 40 cm. The dioptic power of a corrective lens is:
	A.40 D
	B.-4 D
	C.-2.5 D
	D.-0.25 diopter

Ans: -2.5 D

Q13.	Two thin lenses of focal lengths 20 cm and 25 cm are placed in contact. The effective power of the combination is:
	A.45 D
	B.9 D
	C.\(\frac{1}{9}\) D
	D.6 D

Ans: 9 D

Q14.	A blue cross on the white background is illuminated with white light and is observed through red filter. What is seen?
	A.A red cross on a black background
	B.A blue cross on a red background
	C.A red cross on a blue background
	D.A black cross on a red background