CUET Exam  >  CUET Tests  >  CUET Mock Test Series  >  Physics: CUET Mock Test - 7 - CUET MCQ

Physics: CUET Mock Test - 7 - CUET MCQ


Test Description

40 Questions MCQ Test CUET Mock Test Series - Physics: CUET Mock Test - 7

Physics: CUET Mock Test - 7 for CUET 2024 is part of CUET Mock Test Series preparation. The Physics: CUET Mock Test - 7 questions and answers have been prepared according to the CUET exam syllabus.The Physics: CUET Mock Test - 7 MCQs are made for CUET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Physics: CUET Mock Test - 7 below.
Solutions of Physics: CUET Mock Test - 7 questions in English are available as part of our CUET Mock Test Series for CUET & Physics: CUET Mock Test - 7 solutions in Hindi for CUET Mock Test Series course. Download more important topics, notes, lectures and mock test series for CUET Exam by signing up for free. Attempt Physics: CUET Mock Test - 7 | 40 questions in 45 minutes | Mock test for CUET preparation | Free important questions MCQ to study CUET Mock Test Series for CUET Exam | Download free PDF with solutions
Physics: CUET Mock Test - 7 - Question 1

Identify the process in which an electron escapes from the metal surface.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 1

The process in which an electron escapes from the metal surface is known as electron emission. Electrons are loosely bound to the nucleus, and therefore, a little energy push sets these electrons flying out of their respective orbits.

Physics: CUET Mock Test - 7 - Question 2

How many types of electron emissions exist?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 2

There are four types of electron emissions, namely, thermionic emission, photoelectric emission, secondary emission, and field emission. These are the different methods of producing electron emissions.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Physics: CUET Mock Test - 7 - Question 3

Which type of waves shows the property of polarization?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 3

Only transverse waves show the property of polarization. Their vibrations can occur in all directions perpendicular to the direction of travel. The longitudinal, infrared, and microwaves do not show the property of polarization.

Physics: CUET Mock Test - 7 - Question 4

What is the polarization angle of a medium of refractive index √3?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 4

tan ip = μ = √3.
ip = tan-1(√3)
ip = 60o
Therefore, the polarization angle of a medium of refractive index √3 is 60o.

Physics: CUET Mock Test - 7 - Question 5

Which field vector is used to represent the polarization of an em wave?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 5

An electric field vector is used to represent the polarization of an em wave. It is perpendicular to the plane of propagation of the light wave. Therefore, a vertically polarized electromagnetic wave of wavelength λ has its electric field vector oscillating in the vertical direction.

Physics: CUET Mock Test - 7 - Question 6

Identify the property which is not mutually perpendicular to the polarized light wave in a plane.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 6

Plane of vibration, the plane of polarization, and direction of propagation of the light wave are mutually perpendicular to the polarized light wave in a plane. The other factors are not mutually perpendicular to the polarized light wave in a plane.

Physics: CUET Mock Test - 7 - Question 7

Which plane is defined as the plane of polarization in a plane-polarized electromagnetic wave?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 7

The plane containing the direction of propagation of light and perpendicular to the plane of vibration is called the plane of polarization. It contains no vibrations. Polarized light waves are light waves in which the vibrations occur in a single plane.

Physics: CUET Mock Test - 7 - Question 8

What are sunglasses made of?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 8

Polaroids absorb only that part of the light which produces a dazzling effect in the eye. But colored glasses absorb more light incident on them and so the image appears dim. Therefore, sunglasses are made of Polaroids.

Physics: CUET Mock Test - 7 - Question 9

What will be the angle of refraction in the glass, if the polarization angle for the air-glass interface is 63.8o?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 9

As ip + rp = 90o
rp = 90o – 63.8o
rp = 26.2o
Therefore, the angle of refraction in the glass is 26.2o.

Physics: CUET Mock Test - 7 - Question 10

Which of the following is a form of light whose photons share the same frequency and whose wavelengths are in phase with one another?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 10

Coherent light is a form of light whose photons share the same frequency and whose wavelengths are in phase with one another. The phase difference between the waves should be constant in case of coherent sources.

Physics: CUET Mock Test - 7 - Question 11

Pick the odd one out.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 11

LED is the odd one out. LED is short for light-emitting diode. LED is not a coherent source, whereas, others are examples of coherent sources. The light emitted from an LED is neither spectrally coherent nor even highly monochromatic.

Physics: CUET Mock Test - 7 - Question 12

Identify the factor is not the same for coherent waves.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 12

Coherent waves are the waves with the same frequency and the wavelength of the waves are in phase as well. Therefore, the phase difference is constant. But the coherent waves do not have the same amplitude. Since the amplitude is different, there will be no complete constructive interference where they meet, so they will contribute poorly to an interference pattern.

Physics: CUET Mock Test - 7 - Question 13

When is the wave interference strong?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 13

Coherence length is defined as the propagation distance over which a coherent wave maintains a specified degree of coherence. Wave interference is strong when the paths taken by all of the interfering waves are lesser than the coherence length.

Physics: CUET Mock Test - 7 - Question 14

Which of the following is the formula for calculating coherence time?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 14

The formula for calculating coherence time is given as:

Where Τc is the coherence time, λ is the wavelength, ∆λ is the spectral width of the source, and c is the speed of light in a vacuum (i.e. 3 × 108 m/s).

Physics: CUET Mock Test - 7 - Question 15

Which among the following is an example of coherent sources?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 15

LASER is the short form for Laser Amplification by Stimulated Emission Radiation. The amplified light beam coming out of a LASER is essentially due to the emission of electrons stimulated by incident radiation consisting of photons. As a result, this causes the coherent behavior of the LASER beam.

Physics: CUET Mock Test - 7 - Question 16

Which among the following relates scattering and wavelength of the particle?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 16

Light of shorter wavelengths is scattered much more than light of longer wavelengths. The amount of scattering is inversely proportional to the fourth power of the wavelength. This is known as Rayleigh scattering.

Physics: CUET Mock Test - 7 - Question 17

How many kinds of rainbows are there, generally?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 17

Generally, there are two kinds of rainbows, namely primary rainbow and secondary rainbow. The primary rainbow occurs due to one internal reflection and two refractions, whereas secondary rainbow occurs due to two internal reflections and two refractions, from the water drops suspended in the air.

Physics: CUET Mock Test - 7 - Question 18

Find the wrong statement.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 18

During sunrise and sunset, the rays have to travel a large part of the atmosphere since the rays are close to the horizon at that time. That is why, red being the least scattered enters our eyes, as all the other colors get scattered away.

Physics: CUET Mock Test - 7 - Question 19

Which one of the following is not an illustration of the scattering of light?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 19

A rainbow is an example of a dispersion of sunlight by the water drops in the atmosphere. This is a phenomenon due to the combined effect of dispersion, refraction, and reflection of sunlight by spherical water droplets of rain. Others all are common illustrations of scattering of light.

Physics: CUET Mock Test - 7 - Question 20

What is the angle between the incident ray and the emergent ray in a prism called?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 20

A prism is a homogenous, transparent medium enclosed two plane surfaces inclined at an angle. These surfaces are called the refracting surfaces and the angle between the incident ray and emergent ray is known as the angle of deviation.

Physics: CUET Mock Test - 7 - Question 21

Which of the following is Cauchy’s formula?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 21

Cauchy’s dispersion formula is an empirical expression that gives an approximate relation between the refractive index of a medium and the wavelength of the light. Cauchy’s formula is given as:

Where A, B, and C are the arbitrary constants of the medium.

Physics: CUET Mock Test - 7 - Question 22

What is the difference in a deviation between any two colors called?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 22

The difference in a deviation between any two colors is known as angular dispersion. Angular dispersion is given as:
δV - δR = (μV - μR)A
Where μV and μR are the refractive index for violet rays and red rays, respectively. Mean deviation is .

Physics: CUET Mock Test - 7 - Question 23

What is the condition for dispersion without deviation?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 23

Consider combining two prisms of refracting angles A and A’, and dispersive powers ω and ω’ respectively in such a way that their refracting angles are reversed concerning each other. For no deviation, the condition is:
δ + δ’ = 0
So, (μ - 1)A + (μ’ - 1)A’ = 0 or 

Physics: CUET Mock Test - 7 - Question 24

Calculate the dispersive power of crown glass where μ= 1.456 and μ= 1.414.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 24

Given: The refractive index for violet color = 1.456; Refractive index for red color = 1.414
Required equation

ω = 0.096
Therefore, the dispersive power of crown glass is 0.096.

Physics: CUET Mock Test - 7 - Question 25

A thin prism with an angle of 3o and made from glass of refractive index 1.15 is combined with another prism made from glass and has a refractive index of 1.45. If the dispersion were to occur without deviation then what should be the angle of the second prism?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 25

The required equation
⇒ δ = (μ - 1)A
When two prisms are combined, then:
δ = δ + δ’ = (μ - 1)A + (μ’ - 1)A’ = 0

Therefore, the angle of the other prism is 1o and opposite of the first prism.

Physics: CUET Mock Test - 7 - Question 26

Pick out the formula for dispersive power from the following.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 26

The formula for dispersive power is given as:
Dispersive power (ω) = 

Where  = mean refractive index

Physics: CUET Mock Test - 7 - Question 27

On what basis is the classification of electromagnetic waves done?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 27

The classification of electromagnetic waves done according to the frequency called the electromagnetic spectrum. The basic difference various type of electromagnetic waves lies in their wavelength or frequency since all of them travel through vacuum at the same speed and also, the waves differ in their mode of interaction with matter.

Physics: CUET Mock Test - 7 - Question 28

What is the full form of UHF?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 28

UHF stands for Ultra high frequency. Cellular phones used radio waves to transmit voice communication in the Ultra high-frequency Band. The UHF band extends from 900 MHz to 5 x 109 Hz or 5000 MHz. Radio waves are produced by oscillating circuits having an inductor and capacitor.

Physics: CUET Mock Test - 7 - Question 29

Which among the following is an application of microwaves?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 29

Microwave ovens are an application of microwaves. In microwave ovens, the frequency of microwave produced is matched with the natural frequency of water molecules so that resonance occurs and water molecules in the material vibrate at the higher amplitude and transfer energy to nearby food molecules, results in heating the food.

Physics: CUET Mock Test - 7 - Question 30

Pick out the electromagnetic wave which is highly harmful to humans.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 30

Ultraviolet (UV) radiations in large quantities are highly harmful to humans. These rays in solar radiation on reaching earth are absorbed by the ozone layer in the atmosphere. UV rays are produced by special lamps such as mercury and from arc lamps and by very hot bodies like the sun.

Physics: CUET Mock Test - 7 - Question 31

Monica wanted to take photographs of a monument. But since the surrounding is filled with smoke, she is not able to take good photos. Which one of the following electromagnetic waves can be used in this situation to help Monica?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 31

Infrared waves can be used to take photographs during conditions of smoke, fog, etc. as these waves are scattered less than visible rays and hence travel longer distances through the atmosphere. So, using infrared waves can help Monica out.

Physics: CUET Mock Test - 7 - Question 32

A radio can tune to any station in the frequency range from 2.5 MHz to 15 MHz bands. What is the corresponding wavelength band?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 32

Maximum wavelength in the band will correspond to the lowest frequency:
c = fminλmax

= 120 m
Minimum wavelength in the band will correspond to the highest frequency:
c = fmaxλmin

= 20 m
Therefore, the corresponding wavelength band is 20 m to 120 m.

Physics: CUET Mock Test - 7 - Question 33

Electromagnetic radiation has an energy of 15 keV. Then this radiation belongs to which region of electromagnetic waves?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 33

Given: Energy (E) = 15 keV
The required equation
⇒ 

λ=0.826 Å=0.826 × 10-10 m
X rays cover wavelengths ranging from above 10-8 m to 10-13 m. Therefore, this electromagnetic radiation belongs to the region of X rays.

Physics: CUET Mock Test - 7 - Question 34

Which of the following cannot travel in vacuum?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 34

Radio waves, gamma waves, and infrared waves are electromagnetic waves and due to this they do not need any material medium to travel and hence, can travel in vacuum. Whereas, infrasonic waves are mechanical waves and so, they need a material medium to travel. Therefore, infrasonic waves cannot travel in vacuum.

Physics: CUET Mock Test - 7 - Question 35

Pick out the correct increasing order of energy of electromagnetic waves from the following.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 35

The energy of electromagnetic waves is directly proportional to the frequency of the electromagnetic waves. So the order of frequency is given as:
vmicro < vinfrared < vvisible < vultraviolet < vgamma
Since E=hv ➔ E ∝ v
The order of energy is as follows:
Emicro < Einfrared < Evisible < Eultraviolet < Egamma

Physics: CUET Mock Test - 7 - Question 36

The speeds of microwaves, infrared waves, and ultraviolet waves are Vm, Vi, and Vu respectively. Identify the correct combination showing the different waves in vacuum.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 36

The correct combination is ⇒ Vm = Vi = Vu. This is because, in vacuum, all the electromagnetic waves in question will travel at the same speed. The speed with which they travel in vacuum is the speed of light. (c = 3 × 108 m/s).

Physics: CUET Mock Test - 7 - Question 37

Which is the frequency range of gamma rays from the following?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 37

The frequency range of Gamma rays is 3 × 1018 to 5 × 1022 Hz. These rays have a wavelength of 6 × 10-13 to 10-10m. Gamma rays are produced in nuclear reactions and are also emitted by radioactive nuclei.

Physics: CUET Mock Test - 7 - Question 38

Identify the electromagnetic wave which is also known as heatwaves.

Detailed Solution for Physics: CUET Mock Test - 7 - Question 38

Infrared waves are heat radiations also known as heatwaves. These waves are produced by hot bodies and molecules. They do heating because water molecules present in most of the materials readily absorb infrared waves and their thermal motion increases, so they heat themselves and also heat their surroundings.

Physics: CUET Mock Test - 7 - Question 39

Which among the following has a frequency range of 500 kHz to 1000 MHz?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 39

Radio Waves are generally in the frequency range ⇒ 500 kHz to 1000 MHz. Radio waves are used for long-distance communication, such as in television, mobiles, and radios. These devices receive radio waves and convert them to mechanical vibrations in the speaker to create sound waves.

Physics: CUET Mock Test - 7 - Question 40

 LED lights of chargers glow even after it is switched off. Which of the following causes this situation?

Detailed Solution for Physics: CUET Mock Test - 7 - Question 40

This situation is caused due to LC Oscillations. These circuits consist capacitors and inductors, thus the energy keeps oscillating in the circuit even after the electric connection is disconnected. The combination of a capacitor and an inductor constitutes an LC oscillator circuit.

8 docs|148 tests
Information about Physics: CUET Mock Test - 7 Page
In this test you can find the Exam questions for Physics: CUET Mock Test - 7 solved & explained in the simplest way possible. Besides giving Questions and answers for Physics: CUET Mock Test - 7, EduRev gives you an ample number of Online tests for practice

Up next

Download as PDF

Up next