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