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171. According to the theory of relativity, which of the following always remains constant?
  A.  Velocity of light
  B.  Time
  C.  Space
  D.  Length of an object
     
   
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172. The strongest force in nature is
  A.  Electrical force
  B.  Nuclear force
  C.  Gravitational force
  D.  Magnetic force
     
   
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173. Why is it difficult to breathe at higher altitudes?
  A.  due to low temperature
  B.  due to low air pressure
  C.  due to ozone
  D.  due to high humidity
     
   
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174. The process involved in making soap is
  A.  Saponification
  B.  Hydrolysis
  C.  Condensation
  D.  Polymerisation
     
   
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175. spectacles used for viewing 3D films have
  A.  Bifocal lens
  B.  Polaroids
  C.  Concave lens
  D.  Convex lens
     
   
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176. Sound cann not pass through
  A.  Vacuum
  B.  Steel
  C.  Air
  D.  Water
     
   
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177. The swing of a spinning cricket ball in air can be explained on the basis of
  A.  sudden change in wind direction
  B.  buoyancy of air
  C.  Bernoulli's theroem
  D.  turbulence caused by wind
     
   
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178. When a vehicle passes, TV reception gets distorted. This is because
  A.  Metal reflects radiowaves
  B.  Vehicle pollution affects the performance of the TV components
  C.  Spark plug creates electro-magnetic disturbances
  D.  Modern vechicles use electro-ignition system
     
   
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179. What is the wavelength of visible spectrum?
  A.  1300A°-3000A°
  B.  3900A°-7600A°
  C.  7800A°-8000A°
  D.  8500A°-9800A°
     
   
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180. Longitudinal waves cannot travel through
  A.  Vacuum
  B.  Solid
  C.  Liquid
  D.  Gas
     
   
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