CBSE Questions for Class 12 Medical Physics Electromagnetic Waves Quiz 2 - MCQExams.com

Identify which of the following light rays has the highest energy?
  • Violet
  • Green
  • Yellow
  • Orange
  • Red
Name the region beyond the violet end, of the spectrum
  • infraviolet
  • ultraviolet
  • darkviolet
  • lightviolet
Name the radiations of wavelength just longer than $$8\times 10^{-7}m$$.
  • infrared
  • ultrared
  • infraviolet
  • ultraviolet
The source of ultraviolet light is:
  • electric bulb
  • red hot iron ball
  • sodium vapour lamp
  • carbon arc-lamp
Two waves $$A$$ and $$B$$ have wavelength $$0.01A^o$$ and $$9000A^o$$ respectively. Name the two waves.
  • A-gamma, B-infrared
  • A-gamma, B-ultraviolet
  • A-ultraviolet, B-infrared
  • A-gamma, B-X rays
Name the rays or waves of highest frequency.
  • X-rays
  • UV rays
  • IR rays
  • Gamma rays
Name the radiation which can be detected by a solution of silver chloride. 
  • X-ray radiation
  • ultraviolet radiation
  • infrared radiation
  • visible radiation
Displacement current is
  • continuous when electric field is changing in the circuit
  • continuous when magnetic field is changing in the circuit
  • continuous in both types of fields
  • continuous through wires and resistance only
What is the speed of Light $$c$$?
  • $$c=3\times 10^{-8} m s^{-1}$$
  • $$c=3\times 10^8 km s^{-1}$$
  • $$c=3\times 10^8 mm s^{-1}$$
  • $$c=3\times 10^8 m s^{-1}$$
According to Maxwell's equation, the velocity of light in any medium is expressed as
  • $$\displaystyle\frac{1}{\sqrt{\mu_0\varepsilon_o}}$$
  • $$\displaystyle\frac{1}{\sqrt{\mu\varepsilon}}$$
  • $$\displaystyle\sqrt{\frac{\mu}{\varepsilon}}$$
  • $$\displaystyle\sqrt{\frac{\mu_0}{\varepsilon}}$$
An electromagnetic wave has a frequency of $$500MHz$$ and a wavelength of $$60cm$$. Calculate the velocity of the wave.
  • $$3\times 10^8kms^{-1}$$
  • $$3\times 10^8cms^{-1}$$
  • $$3\times 10^{-8}ms^{-1}$$
  • $$3\times 10^8ms^{-1}$$
Microwaves are detected by
  • barometer
  • point contact diodes
  • thermopiles
  • the eye
State whether given statement is True or False
MRI uses radio-waves.
  • True
  • False
The displacement current was first populated by
  • Maxwell
  • Marconi
  • Ampere
  • Hertz
Which of the following has the shortest wavelength? 
  • Red light
  • Blue light
  • Gamma rays
  • X rays
  • Radio waves
A group of wavelengths is called
  • Wave
  • Echo
  • Sound Wave
  • Spectrum
Which of the following type of radiations are radiated by on oscillating electric charge?
  • Electric
  • Magnetic
  • Thermoelectric
  • Electromagnetic
Fraunhofer spectral lines are called:
  • Line absorption spectra
  • Line emission spectra
  • continuous spectra
  • Continuous emission spectra
Which of the following solar radiations pass through the atmosphere of earth:
X-rays, ultraviolet rays, visible light rays, infrared radiation.
  • X-Ray
  • Ultraviolet
  • Visible
  • Infrared
If $$v_s$$, $$v_x$$ and $$v_m$$ are the speed of soft gamma rays, X-rays and microwaves respectively in vacuum, then
  • $$v_s > v_x > v_m$$
  • $$v_s < v_x < v_m$$
  • $$v_s > v_x < v_m$$
  • $$v_s = v_x = v_m$$
Which one of the following rays has minimum frequency?
  • Ultraviolet rays
  • X-rays
  • $$\gamma$$-rays
  • Infra-red rays
Which of the following electromagnetic radiations have the smallest wavelength?
  • Ultraviolet waves
  • X-rays
  • $$\gamma$$-rays
  • Microwaves
Which of the following electromagnetic waves has the longest wavelength?
  • Heat waves
  • Visible light
  • Radio frequency waves
  • Microwaves
Maxwell's equation describe the fundamental laws of
  • electricity
  • magnetism
  • mechanics
  • both (A) and (B)
Radio waves with frequencies higher than television signals are
  • ultrasonic waves
  • sound waves
  • light waves
  • microwaves
The frequencies of X-rays, $$\gamma$$-rays and ultraviolet rays are respectively a, b and c. Then
  • $$a < b$$, $$b>c$$
  • $$a>b$$, $$b>c$$
  • $$a>b$$, $$b < c$$
  • $$a < b$$, $$b < c$$
In an electromagnetic wave, the direction of the magnetic induction $$\vec{B}$$ is
  • parallel to the electric field $$\vec{E}$$
  • perpendicular to the electric field $$\vec{E}$$
  • antiparallel to the pointing vector $$\vec{S}$$
  • random
The electromagnetic waves do not transport
  • energy
  • charge
  • momentum
  • information
Which of the following is of shortest wavelength?
  • X-rays
  • $$\gamma$$-rays
  • Microwaves
  • Radio waves
Radio waves of constant amplitude can be generated with
  • rectifier
  • filter
  • F.E.T
  • oscillator
$$10\:cm$$ is a wavelength corresponding to the spectrum of
  • infrared rays
  • ultraviolet rays
  • microwaves
  • $$\gamma$$-rays
A radar sends the waves towards a distant object and receives the signal reflected by object. These waves are
  • sound waves
  • light waves
  • radio waves
  • microwaves
According to Maxwell's hypothesis, a changing electric field gives rise to
  • an electromagnetic force
  • electric displacement current
  • magnetic field
  • pressure gradient
Find out the wavelength of violet light which has a frequency of $$7.5 \times 10^{14}Hz$$ ?
  • $$2.25\times 10^{23}m$$
  • $$2.5\times 10^{5}m$$
  • $$4\times 10^{-7}m$$
  • $$7.5\times 10^{-7}m$$
  • $$2.25\times 10^{7}m$$
Which of the following radiations has the least wavelength?
  • $$\gamma$$-rays
  • $$\beta$$-rays
  • $$\alpha$$-rays
  • X-rays
It is possible to take pictures of those objects which are not fully visible to the eye using camera films sensitive to
  • ultraviolet rays
  • infrared rays
  • microwaves
  • radiowaves
If $$\lambda=10\:\mathring{A}$$ then it corresponds to :
  • infrared
  • microwaves
  • ultraviolet
  • X-rays
Fluorescent tubes give more light than a filament bulb of same power because
  • the tube contains gas at low temperature
  • ultraviolet light is converted into visible light by fluorescence
  • light is diffused through the walls of the tube
  • it produces more heat than bulb
Electromagnetic waves are transverse in nature is evident by
  • polarization
  • interference
  • reflection
  • diffraction
An accelerated electron would produce
  • $$\gamma$$-rays
  • $$\beta$$-rays
  • $$\alpha$$-rays
  • electromagnetic rays
Radio waves do not penetrate in the band of
  • ionosphere
  • mesosphere
  • troposphere
  • stratosphere
Radio waves and visible light in vacuum have
  • same velocity but different wavelength
  • continuous emission spectrum
  • band absorption spectrum
  • line emission spectrum
Astronauts communicate with one another on moon with the help of.
  • radio waves
  • sound waves
  • ultrasound waves
  • infrasound waves
Choose the correct answer from the alternatives given.
Radio waves diffract around building although light waves do not. The reason is that radio waves
  • travel with speed larger than c
  • have much larger wavelength than light
  • are not electromagnetic waves
  • None of these
Radiations used to get relief from bodyaches are:
  • I.R. radiations
  • U.V. radiations
  • visible radiations
  • none of these
For transmission of speeches, talks, music, dramas etc ........... is used
  • radio broadcast transmitter
  • radio telegraph transmitter
  • navigation transmitter
  • None of these
In which one of the following regions of the electromagnetic spectrum will the vibrational motion of molecules give rise to absorption?
  • Ultraviolet
  • Microwaves
  • Infrared
  • Radio waves
The middle colour in sunlight spectrum is:
  • yellow
  • green
  • blue
  • orange
In which form does the Light propagates?
  • Electric waves
  • Magnetic waves
  • Electromagnetic waves
  • Sound wave
The broad wavelength range of visible spectrum is:
  • $$4000-8000A^o$$
  • $$2000-4000A^o$$
  • $$10000-20000A^o$$
  • None of the above
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