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151. Sun's heat reaches us by
  A.  Radiation
  B.  Convection
  C.  Conduction
  D.  Reflection
     
   
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152. A person wars aspectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focussed in his eyes
  A.  behind the retina
  B.  in front of the retina
  C.  on the retina
  D.  on the blind spot
     
   
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153. Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be
  A.  at the same level in both
  B.  at a higher leel in alcohol
  C.  at a higher level in water
  D.  floating in alcohol and sinking in water
     
   
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154. In MRI machine, whihc one of the following is used?>
  A.  Sound wave
  B.  X rays
  C.  Magnetic wave
  D.  Ultra sound wave
     
   
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155. Electrostatic precipitator is used to control
  A.  air pollution
  B.  water pollution
  C.  solid waste
  D.  Noise pollution
     
   
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156. A new technolgoy which provides the ability to create an intereact with it is called:
  A.  Televirtuality
  B.  3-D reality
  C.  Alternate reality
  D.  Virtual reality
     
   
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157. Among the following material sound travels faster in
  A.  steel
  B.  Air
  C.  Vacuum
  D.  Water
     
   
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158. Shock absorbers are usually made of steel as it
  A.  has higher elasticity
  B.  has lower elasticity
  C.  is not brittle
  D.  has no ductile property
     
   
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159. The function of ball bearings in a wheel is
  A.  to increase friction
  B.  to convert kinetic friction into rolling friction
  C.  to covnert static friction itno kinetic friction
  D.  just for convenience
     
   
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160. Mirage is an example of
  A.  refraction of light only
  B.  total internal, reflection of light only
  C.  dispersion of light only
  D.  refraction and total internal refletion of light
     
   
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