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Assertion & Reason Test: Electromagnetic Waves - NEET MCQ


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16 Questions MCQ Test Topic-wise MCQ Tests for NEET - Assertion & Reason Test: Electromagnetic Waves

Assertion & Reason Test: Electromagnetic Waves for NEET 2024 is part of Topic-wise MCQ Tests for NEET preparation. The Assertion & Reason Test: Electromagnetic Waves questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Electromagnetic Waves MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Electromagnetic Waves below.
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Assertion & Reason Test: Electromagnetic Waves - Question 1

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Electromagnetic waves do not require any medium to travel.

Reason (R): Electromagnetic waves cannot travel through any medium.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 1
Electromagnetic waves are not mechanical waves. Hence, they do not require any medium to travel. It does not mean that electromagnetic waves cannot travel through a medium. Hence the assertion is true. But the reason is false.
Assertion & Reason Test: Electromagnetic Waves - Question 2

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): X-ray travels with the speed of light.

Reason (R): X-ray is an e.m. wave.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 2
Velocity of all electromagnetic waves is 3 × 108 m/s which is the velocity of light.
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Assertion & Reason Test: Electromagnetic Waves - Question 3

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion(A): The Ozone layer present at the top of the stratosphere is very crucial for human survival.

Reason (R): Ozone layer prevents IR radiation.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 3
There is a layer present at the top of the stratosphere which is known as the Ozone layer. This layer prevents UV radiations, mainly coming from the Sun, to reach Earth. UV radiation is harmful for human beings. So, the assertion is true. But the reason is false.
Assertion & Reason Test: Electromagnetic Waves - Question 4

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Electromagnetic radiation exerts pressure.

Reason (R): Electromagnetic waves carry momentum and energy.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 4
Electromagnetic radiation is composed of photons which has momentum (λ/h) and energy (hν). When a photon is incident on a surface, its momentum changes which gives rise to radiation pressure. So, the assertion and reason both are true but the reason does not explain the assertion.
Assertion & Reason Test: Electromagnetic Waves - Question 5

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Dipole oscillation produces electromagnetic waves.

Reason (R): Accelerated charge produces electromagnetic waves.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 5
A source of electromagnetic waves is accelerating charge, since accelerated charge produces both electric and magnetic fields. Again according to Maxwells’ classical theory, dipole oscillation produces electromagnetic waves, since charges are accelerated. So, assertion and reason both are true and the reason explains the assertion.
Assertion & Reason Test: Electromagnetic Waves - Question 6

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Microwaves are considered suitable for radar systems.

Reason (R): Microwaves are of shorter wavelength.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 6
Wavelength of microwaves ranges from 10–3 to 0.1 m. Hence, it can be bounced from any small object. Hence, it is suitable for radar systems. So, the assertion and reason both are true and the assertion is properly explained by the reason.
Assertion & Reason Test: Electromagnetic Waves - Question 7

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Gamma rays are electromagnetic waves having the smallest wavelength.

Reason (R): Gamma rays are having the lowest frequency.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 7
Gamma rays are electromagnetic waves having the smallest wavelength. So, the assertion is true.

Relation between wavelength and frequency is ν = c/λ.

c is the velocity of light and same for all electromagnetic waves. For Gamma rays wavelength being smallest, frequency will be highest. So, the reason is false.

Assertion & Reason Test: Electromagnetic Waves - Question 8

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Electromagnetic waves interact with matter and set up oscillations.

Reason : Interaction is independent of the wavelength of the electromagnetic wave.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 8
Electromagnetic waves interact with matter via their electric and magnetic field which in oscillation of charges present in all matter. The detailed interaction and so the mechanism of absorption, scattering, etc. depend of the wavelength of the electromagnetic wave, and the nature of the atoms and molecules in the medium.
Assertion & Reason Test: Electromagnetic Waves - Question 9

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Electromagnetic waves exert radiation pressure.

Reason : Electromagnetic waves carry energy.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 9
Electromagnetic waves have linear momentum as well as energy. This concludes that they can exert radiation pressure by falling beams of electromagnetic radiation on an object.
Assertion & Reason Test: Electromagnetic Waves - Question 10

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : The velocity of electromagnetic waves depends on electric and magnetic properties of the medium.

Reason : Velocity of electromagnetic waves in free space is constant.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 10
Assertion: The velocity of the electromagnetic wave depends on the electric and magnetic properties and is given by

It shows that the speed of the EM waves depends on the magnetic field as well as the electric field in the medium.

v = 1/√μ0​ε0​​​

Reason: The velocity of the electromagnetic waves in free space is constant and is equal to the speed of light.

The assertion and reason both are correct but this Reason is not a proper explanation of Assertion. Option (B) is correct.

Assertion & Reason Test: Electromagnetic Waves - Question 11

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Microwaves are better carriers of signals than optical waves.

Reason : Microwaves move faster than optical waves.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 11
The optical waves used in optical fibre communication are better carriers of signals than microwaves. The speed of microwave and optical waves is the same in vacuum.
Assertion & Reason Test: Electromagnetic Waves - Question 12

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Electromagnetic waves are transverse in nature.

Reason : The electric and magnetic fields in electromagnetic waves are perpendicular to each other and the direction of propagation.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 12
Transverse waves are those waves in which the particles of the medium oscillate perpendicular to the direction of wave propagation.
Assertion & Reason Test: Electromagnetic Waves - Question 13

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Electromagnetic waves carry energy and momentum.

Reason : Electromagnetic waves can be polarised.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 13
Consider a plane perpendicular to the direction of propagation of the electromagnetic wave. If electric charges are present in this plane, they will be set and sustained in motion by the electric and magnetic fields of the electromagnetic wave. The charge thus acquired energy and momentum from the wave. This illustrates the fact that an electromagnetic wave like other waves carries energy and momentum.
Assertion & Reason Test: Electromagnetic Waves - Question 14

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : The electromagnetic wave is transverse in nature.

Reason : Electromagnetic waves propagate parallel to the direction of electric and magnetic fields.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 14
This electromagnetic wave contains sinusoidally time varying electric and magnetic fields which act perpendicular to each other as well as at right angle to the direction of propagation of waves, so electromagnetic waves are transverse in nature. Electromagnetic waves propagate in the perpendicular direction to both fields.
Assertion & Reason Test: Electromagnetic Waves - Question 15

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : The basic difference between various types of electromagnetic waves lies in their wavelength or frequencies.

Reason : Electromagnetic waves travel through vacuum with the same speed.

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 15
The basic difference between various types of electromagnetic waves lies in their wavelengths or frequencies since all of them travel through vacuum with the same speed. Consequently, the waves differ considerably in their mode of interaction with matter.
Assertion & Reason Test: Electromagnetic Waves - Question 16

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Infrared radiation plays an important role in maintaining the average temperature of earth.

Reason : Infrared radiations are sometimes referred to as heat waves

Detailed Solution for Assertion & Reason Test: Electromagnetic Waves - Question 16
Infrared radiation helps to maintain the earth's warmth through the greenhouse effect. Incoming visible light which passes relatively easily through the atmosphere is absorbed by the earth’s surface and re-radiated as infrared radiation. The radiation is trapped by greenhouse gases such as carbon dioxide and water vapour and they heat up and heat their surroundings.
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