Railways General Science & Technology Ray Optics Sample Paper

done Ray Optics Sample Test Paper-6 Total Questions - 20    [Download]

• question_answer1)
  A swimming pool looks shallower than it really is, when seen by a person standing outside near it, because of the phenomenon of
  A)
   Refraction of light
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  B)
   Reflection of light
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  C)
   Dispersion of light
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  D)
          None of these
  done clear
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• question_answer2)
  A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his textbook. Which of the following statements is correct?
  A)
   The near point of his eyes has receded away
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  B)
   The near point of his eyes has come closer to him
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  C)
   The far point of his eyes has come closer to him
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  D)
   The far point of his eyes has receded away
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• question_answer3)
  Which of the following phenomena of light are involved in the formation of a rainbow?
  A)
   Reflection, refraction and dispersion
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  B)
   Refraction, dispersion and total internal reflection
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  C)
   Refraction, dispersion and total internal reflection
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  D)
   Dispersion, scattering and total internal reflection
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• question_answer4)
  The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
  A)
   Is scattered the most by smoke or fog
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  B)
   Is scattered the least by smoke or fog
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  C)
   Is absorbed the most by smoke or fog
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  D)
   Moves fastest in air
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• question_answer5)
  Twinkling of a star is due to
  A)
   Atmospheric refraction of sunlight
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  B)
   Atmospheric refraction of starlight
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  C)
   Lightening in the sky
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  D)
   None of these
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• question_answer6)
  Soap bubble looks coloured due to
  A)
   Dispersion        
  done clear
  B)
   reflection
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  C)
   Interference      
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  D)
   any one of these
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• question_answer7)
  A normal eye is not able to see objects closer than 25 cm because
  A)
   The focal length of the eye is 25 cm
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  B)
   The distance of the retina from the eye-lens is 25 cm
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  C)
   The eye is not able to decrease the distance between the eye-lens and the retina beyond a limit
  done clear
  D)
   The eye is not able to decrease the focal length beyond a limit
  done clear
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• question_answer8)
  Magnification produced by a rear view mirror fitted in vehicles
  A)
   Is less than one
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  B)
   Is more than one
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  C)
   is equal to one
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  D)
   Can be more than or less than one depending upon the position of the object in front of it.
  done clear
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• question_answer9)
  Figure shows two rays A and B being reflected by a mirror and going as A' and B'. The mirror
  A)
   Is plane
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  B)
   Is convex
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  C)
   Is concave
  done clear
  D)
   May be any spherical mirror
  done clear
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• question_answer10)
  Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on the phenomenon of
  A)
   Diffraction        
  done clear
  B)
          Interference
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  C)
   Total internal reflection
  done clear
  D)
   Polarization
  done clear
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• question_answer11)
  The basic reason for the extraordinary sparkle of a suitably cut diamond is that
  A)
   It is very hard
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  B)
   It has a very high refractive index
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  C)
   It has a very high transparency
  done clear
  D)
   It has well-defined cleavage planes
  done clear
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• question_answer12)
  A person standing in front of a mirror finds that his image is larger than himself. This implies that mirror is
  A)
   Convex
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  B)
   Concave
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  C)
   Plane  
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  D)
   Piano convex
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• question_answer13)
  A plane mirror placed in front of a person is moved parallel to itself at a speed of 0.5 m/s away from the person. Then
  A)
   The image moves away from the person at a speed of 1 m/s
  done clear
  B)
   The image moves away from the person at a speed of 0.5 m/s
  done clear
  C)
   The image moves toward the person at a speed of 0.5 m/s
  done clear
  D)
   The image move towards the person at a speed of 1 m/s
  done clear
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• question_answer14)
  Although each eye perceives a separate image, we do not see everything double because
  A)
   The inverted image formed by one eye is re inverted by the other
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  B)
   The optic nerve fuses the two images
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  C)
   One eye words at one time
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  D)
   None of these
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• question_answer15)
  An object is immersed in a fluid. In order that the object becomes invisible, it should
  A)
   Behave as a perfect reflector
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  B)
   Absorb all light falling on it
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  C)
   Have refractive index one
  done clear
  D)
   Have refractive index exactly matching with that of the surrounding fluid
  done clear
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• question_answer16)
  Finger prints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking it into
  A)
   Mercury light
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  B)
   Sunlight
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  C)
   Infrared light
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  D)
   Ultraviolet light
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• question_answer17)
  How should people wearing spectacles work with a microscope
  A)
   They cannot use the microscope at all
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  B)
   They should keep on wearing their spectacles
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  C)
   They should take off spectacles
  done clear
  D)
   B and C is both way
  done clear
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• question_answer18)
  The minimum temperature of a body at which it emits light is
  A)
   \[1200{}^\circ C\]       
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  B)
   \[1000{}^\circ C\]
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  C)
   \[500{}^\circ C\]         
  done clear
  D)
   \[200{}^\circ C\]
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• question_answer19)
  Stars are not visible in the day time because
  A)
   Stars hide behind the sun
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  B)
   Stars do not reflect sun rays during day
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  C)
   Stars vanish during the day
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  D)
   Atmosphere scatters sunlight into a blanket of extreme brightness through which faint stars cannot be visible.
  done clear
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• question_answer20)
  If there had been one eye of the man, then
  A)
   Image of the object would have been inverted
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  B)
   Visible region would have decreased
  done clear
  C)
   Image would have not been seen in three dimensional
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  D)
   b and c both
  done clear
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