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12th Physics weekly Test -3 ( Electromagnetic waves )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test -3 ( Electromagnetic waves )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

We can make long distance photographs using _________.

radio waves
visible light
X-rays
IR rays

The frequency of electromagnetic radiation Hertz produced was _________ Hz.

10⁸
5x10⁷
3x10⁸
6x10⁵

The existence of E.M. waves was confirmed experimentally by

Hertz
Maxwell
Huygens
Planck

The energy of electromagnetic waves is due to which energy of the oscillating charge?

mechanical
potential
kinetic
electrostatic

In Hertz experiment, the formula for the frequency is _____

\(\frac { 1 }{ 2\pi \sqrt { \frac { L }{ C } } } \)
\(\frac { \sqrt { LC } }{ 2\pi } \)
\(\frac { 1 }{ 2\pi \sqrt { LC } }\)
\(\frac { 2\pi }{ \sqrt { LC } } \)

Television waves range from

54 MHz to 89 MHz
54 MHz to 890 MHz
54 MHz to 89 MHz
54 MHz to 80 MHz

The correct definition of spectrum is

band of colours
band of white light
band of frequencies
band of amplitudes

________ lamps are used in physiotherapy.

IR
UV
visible
૪-rays

The electric and magnetic field of an EM wave are

in phase and perpendicular to each other
in phase and parallel to each other
in opposite phase and perpendicular to each other
in opposite phase and parallel to each other

Which of the following gives rise to continuous emission spectrum?

electric filament lamp
sodium vapour lamp
gases in the discharge tube
calcium salt in Bunsen flame

______ radiations are used in destroying bacteria.

UV
IR
X-ray
Gamma rays

The sun's outer layer is called _______.

chromosphere
exosphere
Photosphere
stratosphere

A red flower seen in the light of mercury vapour lamp through a green filter will appear

black
red
violet
white

If the amplitude of the magnetic fi eld is 3 × 10⁻⁶ T, then amplitude of the electric fi eld for a electromagnetic waves is

100 Vm⁻¹
300 V m^-1
600 V m^-1
900 V m^-1

An electromagnetic wave has 5 joules of electric energy. The magnetic energy is

zero
5 J
10 J
2.5 J

The electromagnetic waves are __________ by electric and magnetic fields

deflected
not deflected
oscillated
scanned

Cellular phones use radio-waves in ______ band

long wave
ultra high frequency
short frequency
medium frequency

In E.M. waves, the variations in electric and magnetic fields are at an angle of________.

0°
60°
90°
270°

_________ are used to study crystal structure in solids.

UV rays
IR rays
X-rays
Gamma rays

The central core of the sun is called

chromosphere
stratosphere
photosphere
thermo sphere

Electromagnetic waves are _________ in nature .

parallel
transverse
longitudinal
Uni-directional

_________ emission spectrum is used to identify the gas used.

Continuous
Line
Band
Solid

The speed of electromagnetic waves in free space is ______ m/s

3 x 10^-18
6.2 x 10⁵
3 X 10⁸
5 x 10²

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

The velocity of light in vacuum can be changed by changing

frequency
amplitude
wave length
none of these

Which of the following electromagnetic radiation is used for viewing objects through fog

microwave
gamma rays
X- rays
infrared

Which EM waves are used in medicine to destroy cancer cells?

radio waves
IR
૪ rays
UV rays

Which of the following electromagnetic waves has the highest frequency?

radio waves
micro waves
X- rays
૪-rays

________ radiations are used to study atomic structure.

UV
IR
X-rays
Gamma

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

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