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CUET Physics Sample Papers Ray Optics and Optical Instruments

Hi CUET aspirants, Welcome to Amans Maths Blogs (AMBIPi). In this post, you will get CUET Physics Mock Test Ray Optics and Optical Instruments AMBIPi. This CUET Physics Mock Test is of the Physics chapter Ray Optics and Optical Instruments. Before solving these CUET Physics questions, you must read CUET Physics Notes, which helps you to revise CUET Physics Syllabus and then you must need to solve CUET Previous Years Questions Papers.

CUET Physics Mock Test

CUET Physics Question No: 1

The refractive index of a certain glass is 1.5 for light whose wavelength in vacuum is 6000Å. The wavelength of this light when it passes through glass is

Option A : 4000 Å

Option B : 6000 Å

Option C : 9000 Å

Option D : 15000 Å

Show/Hide Answer Key

Option A: 4000 Å

λmedium = λair / μ = 6000 / 1.5 = 4000 Å

CUET Exam Physics Question No: 2

When light travels from one medium to the other of which the refractive index is different, then which of the following will change

Option A : Frequency, wavelength and velocity

Option B : Frequency and wavelength

Option C : Frequency and velocity

Option D : Wavelength and velocity

Show/Hide Answer Key

Option D: Wavelength and velocity 

velocity and wavelength change but frequency remains same.

CUET UG Physics Question No: 3

When a light wave goes from air into water, the quality that remains unchanged is its

Option A : Speed 

Option B : Amplitude

Option C : Frequency 

Option D : Wavelength

Show/Hide Answer Key

Option C: Frequency 

Let v’ = v/ λ’ = c/μ /λ/μ = c/λ = v

CUET Domain Subject Physics Question No: 4

The magnifying power of a telescope can be increased by

Option A : Increasing focal length of the system

Option B : Fitting eye piece of high power

Option C : Fitting eye piece of low power

Option D : Increasing the distance of objects

Show/Hide Answer Key

Option B: Fitting eye piece of high power

Magnifying power of telescope is fo fe , so as 1/ fe

CUET BSc Physics Question No: 5

A cut diamond sparkles because of its

Option A : Hardness

Option B : High refractive index

Option C : Emission of light by the diamond

Option D : Absorption of light by the diamond

Show/Hide Answer Key

Option B: High refractive index

Due to high refractive index its critical angle is very small so that most of the light incident on the diamond is total internally reflected repeatedly and diamond sparkles.

CUET Entrance Exam Physics Question No: 6

The wavelength of light in two liquids ‘x’ and ‘y’ is 3500 Å and 7000 Å, then the critical angle of x relative to y will be

Option A : 60° 

Option B : 45°

Option C : 30°

Option D : 15°

Show/Hide Answer Key

Option C: 30°

The critical angle c is given by sin C = n2/ n1 = λ1 / λ2 = 35000 / 7000 = 1/2 ⇒ C = 30°

CUET Exam Question No: 7

The critical angle for diamond (refractive index = 2) is

Option A : About 20° 

Option B : 60°

Option C : 45°

Option D : 30°

Show/Hide Answer Key

Option D: 30°

μ = 1 / sin c ⇒ c = sin -1 (1/2) = 30°

CUET Physics Practice Questions No: 8

Total internal reflection is possible when light rays travel

Option A : Air to water

Option B : Air to glass

Option C : Glass to water

Option D : Water to glass

Show/Hide Answer Key

Option C: Glass to water

Total internal reflection occurs when light ray travels from denser medium to rarer medium

CUET Physics Sample Paper Question No: 9

The critical angle for a medium is 60°. The refractive index of the medium is

Option A : 2/ √3

Option B : √2/ 3

Option C : √3

Option D : √3/ 2

Show/Hide Answer Key

Option A: 2/ √3

μ = 1/ sin c = 1 / sin 60 = 2 √3

CUET Physics Mock Test Question No: 10

A normally incident ray reflected at an angle of 90°. The value of critical angle is

Option A :  45°

Option B : 90°

Option C : 65°

Option D : 43.2°

Show/Hide Answer Key

Option B: 90°

Critical angle c is equal to incident angle if ray reflected normally. c = 90°

CUET Physics Question No: 11

An observer looks at a tree of height 15m with a telescope of magnifying power 10. To him, the tree appears

Option A : 10 times taller 

Option B : 15 times taller

Option C : 10 times nearer 

Option D : 15 times nearer

Show/Hide Answer Key

Option C: 10 times nearer 

Telescope is used to see the distant objects. More magnifying power means more nearer image.

CUET Exam Physics Question No: 12

Light from sodium lamp is passed through cold sodium vapour, the spectrum of transmitted light consist of

Option A : A line at 5890 Å

Option B : A line at 5896 Å

Option C : Sodium doublet lines

Option D : No spectral features

Show/Hide Answer Key

Option D: No spectral features

According to Kirchhoff’s law, a substance in unexcited state will absorb these wavelength which it emits in de-excitation.

CUET UG Physics Question No: 13

Dispersive power depends upon

Option A : The shape of prism

Option B : Material of prism

Option C : Angle of prism

Option D : Height of the prism

Show/Hide Answer Key

Option B: Material of prism

Dispersive power () depends only on nature of material.

CUET Domain Subject Physics Question No: 14

If the telescope is reversed, i.e., seen from the objective side

Option A : Object will appear very small

Option B : Object will appear very large

Option C : There will be no effect on the image formed by the telescope

Option D :  Image will be slightly greater than the earlier one

Show/Hide Answer Key

Option A: Object will appear very small

Because magnification in this case becomes reciprocal of initial magnification.

CUET BSc Physics Question No: 15

In a compound microscope magnification will be large, if the focal length of the eye piece is

Option A : Large 

Option B : Smaller

Option C : Equal to that of objective

Option D : Less than that of objective

Show/Hide Answer Key

Option B: Smaller

For a compound microscope m ∞ 1 / f0 fe

CUET Entrance Exam Physics Question No: 16

The focal length of the objective lens of a compound microscope is

Option A : Equal to the focal length of its eye piece

Option B : Less than the focal length of eye piece

Option C : Greater than the focal length of eye piece

Option D : Any of the above three

Show/Hide Answer Key

Option B: Less than the focal length of eye piece

For a compound microscope fobjective < feye piece .

CUET Exam Question No: 17

Microscope is an optical instrument which 

Option A : Enlarges the object

Option B : Increases the visual angle formed by the object at the eye

Option C : Decreases the visual angle formed by the object at the eye

Option D : Brings the object nearer

Show/Hide Answer Key

Option B: Increases the visual angle formed by the object at the eye

In microscope final image formed is enlarged which in turn increases the visual angle.

CUET Physics Practice Questions No: 18

An astronomical telescope of ten-fold angular magnification has a length of 44 cm. The focal length of the objective is

Option A : 4 cm 

Option B : 40 cm

Option C : 44 cm 

Option D : 440 cm

Show/Hide Answer Key

Option B: 40 cm

L = f0 + fe = 44 and |m| = f0 fe = 10

CUET Physics Sample Paper Question No: 19

When the length of a microscope tube increases, its magnifying power.

Option A : Decreases

Option B : Increases

Option C : Does not change

Option D : May decreases on increases

Show/Hide Answer Key

Option A: Decreases

For a |m| = vo / u0 x D / μe and L = v0 + ue

For a given microscope, with increase in L, ue will increase and hence magnifying power (m) will decrease.

CUET Physics Mock Test Question No: 20

The aperture of a telescope is made large, because

Option A : To increases the intensity of image

Option B : To decrease the intensity of image

Option C : To have greater magnification

Option D : To have lesser resolution

Show/Hide Answer Key

Option A: To increases the intensity of image

For greater aperture of lens, light passing through lens is more and so intensity of image increases.

CUET Physics Question No: 21

The magnifying power of a simple microscope can be increased, if we use eye-piece of

Option A : Higher focal length

Option B : Smaller focal length

Option C : Higher diameter

Option D : Smaller diameter

Show/Hide Answer Key

Option B: Smaller focal length

m = 1+ D/f Smaller the focal length, higher the magnifying power. 

CUET Exam Physics Question No: 22

The maximum magnification that can be obtained with a convex lens of focal length 2.5 cm is (the least distance of distinct vision is 25 cm)

Option A : 10

Option B : 0.1

Option C : 62.5

Option D : 11

Show/Hide Answer Key

Option D: 11

mmax = 1 + D/f  = 1 + 25/ 2.5 = 11

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