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CBSE TEST PAPER-01 
CLASS - XII PHYSICS (Electro magnetic waves) 
1.
What is the role of ozone in the atmosphere?
[1] 
2.
What is the nature of waves used in radar?
[1] 
3.
Write the application of Infra-red radiations?
[2] 
4.
Which constituent radiation of the electromagnetic spectrum is used?
(1) To photograph internal parts of human body.
(2) For air aircraft navigation
[2] 
5.
Electric field in a plane electromagnetic wave is given by
E Z = 60 sin 
( )
3
11
10 3
10 / .
2 2
x t
V m
? ?
+
? ?
? ?
 
(a) Write an expression for the magnetic field 
(b) What is the magnitude of wavelength and frequency of the wave? 
[2] 
6.
In a plane electromagnetic wave, the electric field oscillates sinusoid ally with a
frequency of 2 × 10
10
 Hz and amplitude 48V/m.
(a) What is the wavelength of the em. wave?
(b) Calculate the amplitude of the oscillating magnetic field.
(c) Calculate average energy density of the electromagnetic field of the wave?
[3] 
7.
Find the wavelength of electromagnetic waves of frequency 6 × 10
12
 Hg in free
space. Give two applications?
[3] 
8.
A plane monochromatic wave lies in the visible region. It is represented by the
sinusoidal variation with time by the following components of electric field
Ex = 0, Ey = 4 sin ( )
2
, x vt
p
?
? ?
- ? ?
? ?
Ez = 0 
Where ? = 5 × 10
14
 Hg  And ? is the wavelength of light.
(a) What is the direction of propagation of the wave? 
(b) What is its amplitude?  
(c) Compute the component of magnetic field? 
[3] 
9.
Write the characteristics of em waves? Write the expression for velocity of
electromagnetic waves in terms of permittivity and permeability of the
medium?
[3] 
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FAQs on Electromagnetic Waves Test 01 - Class 12

1. What are electromagnetic waves?
Ans. Electromagnetic waves are a form of energy that consists of both electric and magnetic fields oscillating perpendicular to each other. They are produced by the acceleration of electric charges and can travel through a vacuum or a medium.
2. How do electromagnetic waves differ from other types of waves?
Ans. Electromagnetic waves differ from other types of waves, such as mechanical waves, in several ways. Unlike mechanical waves that require a medium to propagate, electromagnetic waves can travel through a vacuum. They also do not require particles to oscillate, as they are composed of electric and magnetic fields. Additionally, electromagnetic waves can travel at the speed of light, whereas mechanical waves have a specific speed dependent on the properties of the medium.
3. What is the electromagnetic spectrum?
Ans. The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. It encompasses a wide range of waves, from low-frequency radio waves to high-frequency gamma rays. The spectrum is divided into different regions, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays, based on their wavelengths and frequencies.
4. How are electromagnetic waves used in everyday life?
Ans. Electromagnetic waves have numerous applications in our everyday lives. Radio waves are used for broadcasting and communication, while microwaves are utilized in cooking and telecommunications. Infrared waves are used in remote controls and thermal imaging. Visible light allows us to see and is used in optical technologies. X-rays are used in medical imaging, and gamma rays have applications in cancer treatment and sterilization processes.
5. How do electromagnetic waves interact with matter?
Ans. Electromagnetic waves can interact with matter through various processes. When electromagnetic waves encounter matter, they can be reflected, absorbed, transmitted, or refracted. The interaction depends on the properties of the material and the wavelength of the wave. For example, opaque materials reflect or absorb most of the visible light, while transparent materials allow light to pass through. The interaction of electromagnetic waves with matter is the basis for various technologies, such as optics and spectroscopy.
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