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Published on: 13/10/2020
12th Standard Physics Electromagnetic Waves English Medium Free Online Test One Mark questions with Answer Key 2020 - 2021
Download Tamil Nadu 12th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
૪-rays are produced by _______.
radio active nuclei
high energy electrons
incandescent solids
electronic devices
2.
The relation between velocity of light, permeability and permittivity of free space in________.
\({ C }^{ 2 }=\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \)
\(C=\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \)
\({ \mu }_{ 0 }={ \varepsilon }_{ 0 }c\)
\({ \varepsilon }_{ 0 }={ \mu }_{ 0 }c\)
3.
__________discovered electromagnetic induction.
Faraday
Maxwell
Ampere
Hertz
4.
The waves used in physiotherapy is ___________.
I-R rays
U-V rays
μ - waves
૪-rays
5.
A pure red glass plate when placed in the path of the light absorbs everything except__________.
yellow
black
green
red
6.
Which of the following is used to study crystal structure?
microwave
infrared rays
ultraviolet rays
X-rays
7.
Which one of the following is not an electromagnetic waves?
Gamma rays
X-rays
Beta rays
Microwaves
8.
The velocity of light is maximum in ______________.
Diamond
Water
Vacuum
Glass
9.
The unit of μoεo is ______________.
m S-1
m2 S-2
m-1 s
m-2 S-2
10.
The phase difference between electric and magnetic field vectors in the electromagnetic waves?
\(\frac{\pi}{4}\)
\(\frac{\pi}{2}\)
\(\pi\)
zero
11.
Electromagnetic waves are discovered by _______________.
Hertz
Maxwell
Lenz
Huygens
12.
A magnetic field is produced by ____________.
a changing electric field
a moving charge
both of them
none of them
13.
The existence of E.M. waves was confirmed experimentally by __________________.
Hertz
Maxwell
Huygens
Planck
14.
Which EM waves are used in medicine to destroy cancer cells?
radio waves
IR
૪ rays
UV rays
15.
Which of the following electromagnetic waves has the highest frequency?
radio waves
micro waves
X- rays
૪-rays
16.
Which of the following is NOT true for electromagnetic waves?
it transport energy
it transport momentum
it transport angular momentum
in vacuum, it travels with different speeds which depend on their frequency
17.
Which one of them is used to produce a propagating electromagnetic wave?
an accelerating charge
a charge moving at constant velocity
a stationary charge
an uncharged particle
18.
A radiation of energy E falls normally on a perfectly reflecting surface. Th e momentum transferred to the surface __________________.
\(\frac{E}{c}\)
2\(\frac{E}{c}\)
Ec
\(\frac { E }{ { c }^{ 2 } } \)
19.
The electric and the magnetic fields, associated with an electromagnetic wave, propagating along negative X axis can be represented by _____.
\(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { k } \)
\(\vec { E } ={ E }_{ 0 }\hat { k } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)
\(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)
\(\vec { E } ={ E }_{ 0 }\hat { j } \) and \(\vec { B } ={ B }_{ 0 }\hat { i } \)
20.
If the amplitude of the magnetic field is 3 x 10−6 T, then amplitude of the electric field for a electromagnetic waves is _____.
100 V m−1
300 V m-1
600 V m-1
900 V m-1
1.
(b)
high energy electrons
2.
(a)
\({ C }^{ 2 }=\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \)
3.
(a)
Faraday
4.
(a)
I-R rays
5.
(d)
red
6.
(d)
X-rays
7.
(c)
Beta rays
8.
(c)
Vacuum
9.
(d)
m-2 S-2
10.
(d)
zero
11.
(b)
Maxwell
12.
(c)
both of them
13.
(a)
Hertz
14.
(c)
૪ rays
15.
(d)
૪-rays
16.
(d)
in vacuum, it travels with different speeds which depend on their frequency
17.
(a)
an accelerating charge
18.
(b)
2\(\frac{E}{c}\)
19.
\( { E } ={ E }_{ 0 }\hat { k } \) and \({ B } ={ B }_{ 0 }\hat { j } \)
20.
Bo = 3 x 10-6T
Amplitude of electric field, Eo = Boc
Eo = 3 x 10-6 x 3 x 108 = 900V m -1
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