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141. An aircraft can perform aerobatic manoeuvres in a vertical loop becuase of
  A.  Weight
  B.  Centripetal force
  C.  Gravity
  D.  Centrifugal force
     
   
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142. When a person sitting on a swing stands up on the swing, the frequency of oscillation
  A.  decreases
  B.  does not change
  C.  become infinite
  D.  increases
     
   
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143. Which colour of light shows maximum deviation when passed through a prism?
  A.  Violet
  B.  Green
  C.  Red
  D.  Yellow
     
   
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144. The owl can see most clearly in total darkness because
  A.  it has squint eyes
  B.  it has large eyes with orbs directed forward, giving it binocular sight
  C.  it has light bulbs in its eyes provided by nature
  D.  it produces infrasonic sounds
     
   
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145. Red light is used for signals because it has
  A.  low refraction in the medium
  B.  high intensity
  C.  high frequency
  D.  long wavelength
     
   
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146. The audio signals of TV are
  A.  Frequency modulated
  B.  Amplitude modulated
  C.  Unmodulated
  D.  Velocity modulated
     
   
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147. A microscope used in pathological laboratories forms
  A.  magnified, virtual, erect image
  B.  diminished, real and erect image
  C.  magnified, virtual and inverted image
  D.  diminished, virtual and erect image
     
   
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148. A rubber ball is dropped from a height of 2 metres. To what heigh will it rise if there is no loss of energy/velocity after rebounding?
  A.  4 metres
  B.  2 metres
  C.  3 metres
  D.  1 metres
     
   
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149. A vcacuum cleaner works on the principle of pressure difference. On the mooon it wil
  A.  Work as efficiently as on the earth
  B.  Work with increased efficienty
  C.  Work with reduced efficienty
  D.  not work at all
     
   
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150. A sphere rolls down on two inclined planes of different angles but same height, it does so
  A.  in the same time
  B.  in the same time with the same speed
  C.  with the same speed
  D.  in the same time with the same kinetic energy
     
   
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