Railways General Science & Technology Wave Optics / तरंग प्रकाशिकी Sample Paper

done Wave Optics Sample Test Paper-7 Total Questions - 20    [Download]

• question_answer1)
  A star is emitting yellow light. If it is accelerated towards earth then to an observer on earth, it will appear
  A)
   Shinning yellow
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  B)
   Gradually changing to violet
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  C)
   Gradually changing to red
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  D)
   Unchanged
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• question_answer2)
  Soap bubble looks coloured due to
  A)
   Dispersion        
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  B)
   reflection
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  C)
   Interference      
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  D)
   any one of these
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• question_answer3)
  Infrared radiation is detected by
  A)
   Spectrometer
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  B)
   Pyrometer
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  C)
   Nanometre
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  D)
   Photometer
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• question_answer4)
  The phenomenon of interference is shown by
  A)
   Longitudinal mechanical waves only
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  B)
   Transverse mechanical waves only
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  C)
   Electromagnetic waves only
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  D)
   All the above types of waves
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• question_answer5)
  Illumination of the sun at noon is maximum because
  A)
   Scattering is reduced at noon
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  B)
   Refraction of light is minimum at noon
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  C)
   Rays are incident almost normally
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  D)
   The sun is nearer to earth at noon
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• question_answer6)
  Laser beams are used to measure long distance because
  A)
   They are monochromatic
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  B)
   They are highly polarised
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  C)
   They are coherent
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  D)
   They have high degree of parallelism
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• question_answer7)
  The rectilinear propagation of light in a medium is due to its
  A)
   High velocity    
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  B)
   Large wavelength
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  C)
   High frequency
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  D)
   Source
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• question_answer8)
  Which of the following is not a property of light
  A)
   It requires a material medium for propagation
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  B)
   It can travel through vacuum
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  C)
    It involves transportation of energy
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  D)
   It has finite speed
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• question_answer9)
  Assuming that universe is expanding, if the spectrum of light coming from a star which is going away from earth is tested, then in the wavelength of light
  A)
   There will be no change
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  B)
   The spectrum will move to infrared region
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  C)
   The spectrum will seems to shift to ultraviolet side
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  D)
   None of above
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• question_answer10)
  It is believed that the universe is expanding and hence the distant stars are receding from us. Light from such a star will show
  A)
   Shift in frequency towards longer wavelengths
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  B)
   Shift in frequency towards shorter wavelength
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  C)
   No shift in frequency but a decrease in intensity
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  D)
   A shift in frequency sometimes towards longer and sometimes towards shorter wavelengths
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• question_answer11)
  Through which character we can distinguish the light waves from sound waves
  A)
   Interference      
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  B)
   Refraction
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  C)
   Polarisation
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  D)
   Reflection
  done clear
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• question_answer12)
  If the shift of wavelength of light emitted by a star is towards violet, then this shows mat star is
  A)
   Stationary
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  B)
   Moving towards earth
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  C)
   Moving away from earth
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  D)
   Information is incomplete.
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• question_answer13)
  Ozone is found in
  A)
   Stratosphere     
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  B)
   Ionosphere
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  C)
   Mesosphere      
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  D)
   Troposphere
  done clear
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• question_answer14)
  Heat radiations propagate with the speed of
  A)
   \[\alpha \,-\,rays\]          
  done clear
  B)
   \[\beta \,-\,rays\]
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  C)
   Light waves
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  D)
   Sound waves
  done clear
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• question_answer15)
  Which of the following are not electromagnetic waves
  A)
   Cosmic rays     
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  B)
   Gamma rays
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  C)
   \[\beta \,-\,rays\]
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  D)
   X - rays
  done clear
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• question_answer16)
  The region of the atmosphere above troposphere is known as
  A)
   Litho sphere     
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  B)
   Upper sphere
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  C)
   Lono sphere     
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  D)
   Stratosphere
  done clear
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• question_answer17)
  Which scientist experimentally proved the existence of electromagnetic waves
  A)
   Sir J.C. Bose    
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  B)
   Maxwell
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  C)
   Marconi           
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  D)
   Hertz
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• question_answer18)
  A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of
  A)
   Sky wave         
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  B)
   Ground wave
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  C)
   Sea wave         
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  D)
   both [a] and [b]
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• question_answer19)
  Which of the following shows greenhouse effect
  A)
   Ultraviolet rays
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  B)
   Infrared rays
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  C)
   X-rays 
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  D)
   None of these
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• question_answer20)
  The ozone layer absorbs
  A)
    Infrared radiations
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  B)
   ultraviolet radiations
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  C)
    X-rays
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  D)
   \[\gamma \,-\,rays\]
  done clear
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