CBSE Questions for Class 12 Medical Physics Electromagnetic Waves Quiz 4 - MCQExams.com

The waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity known as:
  • Transverse wave
  • Longitudinal wave
  • Electromagnetic wave
  • None of the above
Solar radiation is
  • Transverse electromagnetic wave
  • Longitudinal electromagnetic wave
  • Stationary wave
  • None of the above
In a parallel C-R network with a voltage source, the current flowing through resistor is _______ current and that flowing through the capacitor is ________ current.
  • conduction, displacement
  • displacement, conduction
  • displacement, displacement
  • conduction, conduction
The part of the electromagnetic spectrum which is suitable for radar systems used in aircraft navigation :
  • X-Rays
  • Gamma Rays
  • Microwaves or short radiowaves 
  • Ultraviolet
Which scientist experimentally proved the existence of electromagnetic wave.
  • Marconi
  • Hertz
  • Maxwell
  • S.C.Bose
The wavelength range of thermal radiation is
  • from $$4000\mathring { A } $$ to $$7000\mathring { A } $$
  • from $$7700\mathring { A } $$ to $$4\times { 10 }^{ 6 }\mathring { A } $$
  • from $${10}^{6}\mathring { A } $$ to $${10}^{8}\mathring { A } $$
  • from $$4\times { 10 }^{ -12 }\mathring { A } $$ to $$4\times { 10 }^{ 8 }\mathring { A } $$
Electromagnetic waves are:
  • Transverse
  • Longitudinal
  • May be longitudinal or transverse
  • Neither longitudinal nor transverse
 Which one of waves tans our skin and causes some substances to become fluorescent?
  • infrared waves.
  • ultraviolet waves.
  • gamma rays.
  • infrared and ultraviolet waves both.
In an electromagnetic wave
  • Power is equally transferred along electric and magnetic fields
  • Power is transmitted in a direction perpendicular to both the field
  • Power is transmitted along electric field
  • Power is transmitted along magnetic field
As speed decreases, if we change medium of electromagnetic waves from air to water, frequency
  • also decreases.
  • also increases.
  • remains same.
  • may increase or decrease.
Which one of waves cannot be seen through electromagnetic spectrum?
  • radio waves
  • micro waves.
  • infrared waves.
  • ultraviolet waves.
The waves used in telecommunication are.
  • Infra red
  • Ultraviolet
  • Micro waves
  • Cosmic rays
To distinguish between real gems and artificial gems a merchant may use which of the following radiations?
  • Infrared rays
  • $$\gamma$$-rays
  • X-rays
  • Ultraviolet rays
In the order of increasing frequency, the electromagnetic spectrum may be arranged as
  • Gamma rays, X-rays, visible light, radio waves
  • X-rays, gamma rays, visible light, radio waves
  • Radio waves, visible light, X-rays, gamma rays
  • Radio waves, visible light, gamma rays, X-rays
A fire screen produces sensation of cooling as
  • It allows both infrared and visible light but cuts off ultraviolet
  • It allows infrared and cuts off shorter wavelengths
  • It cuts off both visible light and infrared
  • It slows only visible light and cuts off infrared
For wireless communication of voice signal through the atmosphere, we use electromagnetic waves in the_________Region of spectrum
  • Ultraviolet
  • Visible
  • Microwave
  • Radiowave
Clear images of soft tissues can be well studied using.
  • MRI
  • X-rays
  • Ultrasonics
  • I.R rays
In which one of the following regions of the electromagnetic specturm will the vibration motion of molecules give rise to absorption?
  • Ultraviolet
  • Microwave
  • Infrared
  • Radio wave
Infrared radiation was discovered in $$1800$$ by :
  • William Wallaston
  • William Herschel
  • Wilhelm Roentgen
  • Thomas Young
Maximum diffraction takes place in a given slit for
  • $$\gamma $$-rays
  • Ultraviolet light
  • Infrared light
  • Radio waves
Which radiations are used in treatment of muscles ache?
  • Ultraviolet
  • Infrared
  • Microwave
  • X-rays
The ozone layer is important because
  • It prevents the cooling of each at night
  • It prevents the IR rays coming from the space
  • It prevents UV rays from the meteors coming from the space
  • It prevents the UV rays and micro rays the coming from the space
The frequencies of X-rays, $$\gamma-rays$$ and ultra violet rays are respectively $$p, q$$ and $$r$$, then
  • $$p > q, q > r$$
  • $$p < q, q > r$$
  • $$p < q, q < r$$
  • $$p > q, q < r$$
The waves used by artificial satellites for communication is the
  • microwaves
  • infrared waves
  • radio waves
  • X-rays
What name is given to the type of astronomy having the following characteristics.
I. It is carried out in the waveband $$300$$nm to $$10$$nm.
II. The atmosphere is opaque to the incoming radiation from space
III. Observations are to be carried out from above the earth's atmosphere.
  • X-ray astronomy
  • Ultra-violet astronomy
  • Infra-red astronomy
  • Gamma ray astronomy
$$X-$$ray falling on a material 
  • Exerts a force on it
  • Transfer energy to it
  • Transfers momentum to it
  • Transfers impules to it
The spectrum of molecular form the substance is called :
  • band spectrum
  • line spectrum
  • absorption spectrum
  • continuous spectrum
Which one of the following is unstable
  • $$\alpha$$ ray
  • $$y-ray$$
  • proton
  • neutron
Wavelength of gamma rays are :
  • $${ 10 }^{ -10 }m$$ to less than $${ 10 }^{ -14 }m$$
  • $${ 10 }^{ -14 }m$$ to less than $${ 10 }^{ -10 }m$$
  • $${ 10 }^{ -11 }m$$ to less than $${ 10 }^{ -14 }m$$
  • $${ 10 }^{ -14 }m$$ to less than $${ 10 }^{ -6 }m$$
An electromagnetic radiation has an energy 14.4 eV. To which region of electromagnetic spectrum does it belong?
  • Ultraviolet region
  • Visible region
  • X-ray region
  • Y-ray region
Which type of waves are produced by a television remote controller?
  • Infra-red waves
  • Radio waves
  • Ultraviolet waves
  • Visible light
How do infra-red waves differ from ultraviolet waves?
  • Infra-red waves are longitudinal
  • Infra-red waves have a lower speed in vacuo (in a vacuum)
  • Infra-red waves have lower frequencies
  • Infra-red waves have smaller wavelengths
Which is having minimum wavelength ?
  • X-rays
  • Ultraviolet rays
  • y - rays
  • Cosmic rays
If an electron oscillates at a frequency of $$1\ GHz$$ it gives
  • $$X-$$ rays
  • Mirowaves
  • Infrared rays
  • None of these
Molybdenum is used as a target element for production of X-rays because it is
  • A heavy element and can easily absorb high velocity electrons
  • A heavy element with a high melting point
  • An element having high thermal conductivity
  • Heavy and can easily deflect electrons
The continuous X-ray spectrum produced by an X-ray machine at constant voltage has
  • A maximum wavelength
  • A minimum wavelength
  • A single wavelength
  • A minimum frequency
In radio theraphy, X-rays are used to
  • Detect bone fractures
  • Treat cancer by controlled exposure
  • Detect heart diseases
  • Detect fault in radio receiving circuit
When cathode rays strike a metal target of high melting point with very high velocity, then
  • X-rays are produced
  • Ealpha-rays are produced
  • TV wave are produced
  • Ultrasonic wave are produced
The most penetrating radiation out of the following is
  • X-rays
  • $$\beta$$-ray
  • $$\alpha$$-particles
  • $$\gamma$$-ray
For the production of X-rays, the target should be made of
  • Steel
  • Copper
  • Aluminum
  • Tungsten
When cathode rays (tube voltage $$\sim 10\ kV$$) collide with the anode of high atomic weight then we get 
  • Positive rays
  • $$X-$$ rays
  • Gamma rays
  • Canal rays
X-rays region lies between
  • Short radio wave and visible region
  • Visible and ultraviolet region
  • Gamma rays and ultraviolet region
  • Short radio wave and long radio wave
X-rays are produced in laboratory by
  • Radiation
  • Decomposition of the atom
  • Bombardment of heigh electrons on heavy metal
  • None of these
Which of the following represents an infrared wavelength
  • $$10^{-4}\ cm$$
  • $$10^{-5}\ cm$$
  • $$10^{-6}\ cm$$
  • $$10^{-7}\ cm$$
Microwaves and radio waves can propagate in vacuum.
  • True
  • False
Which of the following electromagnetic wave 
  • $$X-$$ rays and light waves
  • Cosmic rays and sound waves
  • Beta rays and sound waves
  • Alpha rays and sound waves
Which of the following are not electromagnetic waves 
  • Cosmics rays
  • Y - rays
  • $$\beta $$ - rays
  • X- rays
In vacuum an electrons of energy $$10\ KeV$$ hits tungsten target, then emitted radiation will be 
  • Cathode rays
  • X-rays
  • Infrared rays
  • Visible spectrum
Velocity of x-ray is
  • $$3 \times 10^6 m/sec$$
  • $$3 \times 10^8 m/sec$$
  • $$3 \times 10^5 m/sec$$
  • $$3 \times 10^9 m/sec$$
Match the following:


 Wavelength
 Colour
 a. $$450$$ to $$500 nm$$ Red
 b. $$500$$ to $$550 nm$$ Blue
 c. $$550$$ to $$600 nm$$ Green
 d. $$650$$ to $$700 nm$$ Yellow            
  • a-2;  b-3;  c-4;  d-1
  • a-1;  b-2;  c-3; d-4
  • a-4;  b-3;  c-2;  d-1
  • a-3;  b-2;  c-1;  d-4
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