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Published on: 13/10/2020
12th Standard Physics Electromagnetic Waves English Medium Free Online Test One Mark questions 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.
The sun's outer layer is called _______.
chromosphere
exosphere
Photosphere
stratosphere
2.
The central core of the sun is called _______________.
chromosphere
stratosphere
photosphere
thermo sphere
3.
The spectra used for making dyes is _____________.
line spectra
continuous absorption spectra
fraunhofer spectra
band absorption spectra
4.
Which one of the following groups of electromagnetic waves is in order of increasing frequency?
Microwaves U-V rays, X-rays
Radio waves, visible light and 1-R rays
gamma rays U-V rays radio waves
gamma rays, U-V rays radio waves
5.
Which of the following can be used to take photograph over long distance of ____________.
White light
U- V radiation
I-R radiation
Microwaves
6.
Television waves range from ______________.
54 MHz to 89 MHz
54 MHz to 890 MHz
54 MHz to 89 MHz
54 MHz to 80 MHz
7.
If Vg, Vx, Vm are speeds of gamma rays, X rays and microwaves respectively in vacuum, then ______________.
Vg
Vg > Vk > Vm
Vg > Vx < Vm
Vg= Vx= Vm
8.
The wavelength of electromagnetic wave produced by Hertz experiment was _____________.
6mm
60m
6000 mm
60 cm
9.
Dimensions of \(\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \) is _____________.
\(\frac { { L }^{ 2 } }{ { T }^{ 2 } } \)
\(\frac { { T }^{ 2 } }{ { L }^{ 2 } } \)
\(\frac { T }{ L } \)
\(\frac { L }{ T } \)
10.
If the velocity of light in a medium is 2.25 x 108 ms-1 then the refractive index of the medium will be _______________.
1.5
0.5
1.33
1.73
11.
The EM waves do not transport _______________.
energy
charge
momentum
information
12.
Which of the following E.M waves has the longest wavelength?
Radio waves
IR
X-rays
visible
13.
Electromagnetic waves are produced by _____________.
static charge
moving charge
an accelerating charge
chargeless particles
14.
Who produced the electromagnetic waves first?
J.C.Bose
Marconi
Maxwell
Hertz
15.
The electric and magnetic fields of an electromagnetic wave are _____.
in phase and perpendicular to each other
out of phase and not perpendicular to each other
in phase and not perpendicular to each other
out of phase and perpendicular to each other
16.
If E = Eo sin[106 x -ωt] be the electric field of a plane electromagnetic wave, the value of ω is_____.
0.3 x 10−14 rad s−1
3 x 10−14 rad s−1
0.3 x 1014 rad s−1
3 x 1014 rad s-1
17.
Which of the following is an electromagnetic wave?
α - rays
β - rays
\(\gamma\) - rays
all of them
18.
If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?
\(\oint { \vec { E } .d\vec { A } } =\frac { { Q }_{ enclosed } }{ { \in }_{ 0 } } \)
\(\oint { \vec { B } .d\vec { A } } \) = 0
\(\oint { \vec { B } .d\vec { l } } ={ \mu }_{ 0 }{ i }_{ c}+{ \mu }_{ 0 }{ \in }_{ 0 }\frac { d }{ dt } \oint_s { \vec { E } .d\vec { A } } \)
\(\oint { \vec { E } .d\vec { l } } =-\frac { d }{ dt } { \Phi }_{ B }\)
19.
Which of the following electromagnetic radiations is used for viewing objects through fog
microwave
gamma rays
X- rays
infrared
20.
1.
(a)
chromosphere
2.
(c)
photosphere
3.
(d)
band absorption spectra
4.
(a)
Microwaves U-V rays, X-rays
5.
(c)
I-R radiation
6.
(b)
54 MHz to 890 MHz
7.
(d)
Vg= Vx= Vm
8.
(c)
6000 mm
9.
(a)
\(\frac { { L }^{ 2 } }{ { T }^{ 2 } } \)
10.
(c)
1.33
11.
(b)
charge
12.
(a)
Radio waves
13.
(c)
an accelerating charge
14.
(d)
Hertz
15.
(a)
in phase and perpendicular to each other
16.
E = Eo sin(kx – ωt)
ω = ck
ω = 3 x 108 x 106
ω = 3 x 1014 rad s-1
17.
(c)
\(\gamma\) - rays
18.
(b)
\(\oint { \vec { B } .d\vec { A } } \) = 0
19.
(d)
infrared
20.
(b)
12th Standard Syllabus & Materials
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TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set B
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TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set A
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TN 12th Standard Physics Wave Optics Creative Questions Study Material - QB365 Set C
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Accountancy

History

Computer Applications

Biology

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Computer Applications

Computer Science

Business Maths and Statistics

Commerce

Economics

Maths

Chemistry

Physics

Computer Technology

History

Accountancy

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