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Published on: 05/11/2019
Electromagnetic Waves
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 dark lines in the solar spectrum are called _______ lines.
Fresnel
Newton
Compton
Fraunhofer
2.
_________ emission spectrum is used to identify the gas used.
Continuous
Line
Band
Solid
3.
______ radiations are used in destroying bacteria.
UV
IR
X-ray
Gamma rays
4.
________ radiations are used to study atomic structure.
UV
IR
X-rays
Gamma
5.
________ lamps are used in physiotherapy.
IR
UV
visible
૪-rays
6.
Microwaves ovens are the domestic application of ________ wave.
UV
visible
radio
micro
7.
Vacuum tubes produces ________
Visible light
RF waves
UV rays
Microwaves
8.
The wavelength range of x-rays is _________ (m).
10-4 to 10-2
10-14 to 10-9
10-10 to 3 X 10-8
10-3 to 10-5
9.
In an electromagnetic wave, the electric and magnetic fields are at an angle ___________ to the direction of propagation.
270°
90°
180°
67°
10.
In E.M. waves, the variations in electric and magnetic fields are at an angle of________.
0°
60°
90°
270°
11.
Angle between the electric and magnetic component of EM wave is ______________.
0
π/4
π/2
π
12.
Electromagnetic waves are __________ waves.
longitudinal
Transverse
mechanical
sound
13.
The rays used in weather forecasting is ___________.
I-R rays
U-V rays
X - rays
μ-Waves
14.
The value of \(\frac { 1 }{ \sqrt { { \mu }_{ 0 }{ \varepsilon }_{ 0 } } } \) _________
3 x 10-8 m/s
2.25 x 108 m/s
3 x 108 m/s
2.25 x 108 m/s
15.
Calcium or Barium salts in bunsen flame, CO2, N2 molecule, NH3 gas in a discharge tube gives_______.
line emission spectra
continuous emission spectra
line absorption spectra
band spectra
16.
Band spectra are obtained from _________.
atoms
molecules
solids
semisolids
17.
The spectra used for making dyes is _____________.
line spectra
continuous absorption spectra
fraunhofer spectra
band absorption spectra
18.
The correct definition of spectrum is ____________.
band of colours
band of white light
band of frequencies
band of amplitudes
19.
Short wave bands are upto frequencies _______________.
54 KHz
5.4 MHz
54 MHz
54 GHz
20.
In vacuum speed of light depends upon ______________.
colour
wavelength
frequency
none of the above
21.
The phase and orientation of the magnetic vector associated with electromagnetic oscillations differ respectively from those of the corresponding electric vectors by _______________.
zero, zero
\(\frac{\pi}{2}\),\(\frac{\pi}{2}\)
0, \(\frac{\pi}{2}\)
0,\(\frac{\pi}{2}\)
22.
The wavelength range of ultra violet radiation is _________________.
6x10-10 to 4x10-7m
4x10-7 to 7x10-7m
6x10-10 to 4x10-10m
7x10-7 to 4x10-9m
23.
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
24.
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
25.
Which of the following electromagnetic radiations is used for viewing objects through fog
microwave
gamma rays
X- rays
infrared
1.
(d)
Fraunhofer
2.
(b)
Line
3.
(a)
UV
4.
(a)
UV
5.
(a)
IR
6.
(d)
micro
7.
(d)
Microwaves
8.
(c)
10-10 to 3 X 10-8
9.
(b)
90°
10.
(c)
90°
11.
(c)
π/2
12.
(b)
Transverse
13.
(a)
I-R rays
14.
(c)
3 x 108 m/s
15.
(d)
band spectra
16.
(b)
molecules
17.
(d)
band absorption spectra
18.
(a)
band of colours
19.
(c)
54 MHz
20.
(d)
none of the above
21.
(c)
0, \(\frac{\pi}{2}\)
22.
(a)
6x10-10 to 4x10-7m
23.
(a)
in phase and perpendicular to each other
24.
E = Eo sin(kx – ωt)
ω = ck
ω = 3 x 108 x 106
ω = 3 x 1014 rad s-1
25.
(d)
infrared
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