Part 9

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1)   A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to

  • [A] Outward pull on him
  • [B] Inertia of motion
  • [C] Change in momentum
  • [D] Change in acceleration

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Inertia of motion

2)   In which of the following cases , kinetic energy is being used in performing work ?

  • [A] paddling the bicycle to cover a distance
  • [B] driving a car to cover a distance
  • [C] wind mill grinding wheat grain
  • [D] rowing a boat in the lake

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driving a car to cover a distance

3)   Good conductor of electricity is

  • [A] dry air
  • [B] paper
  • [C] kerosene
  • [D] graphite

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graphite

4)   Why are we able to hear short wave broadcasts better than long wave broadcasts ?

  • [A] Short wave are more energetic than long waves
  • [B] short waves are unaffected by atmospheric disturbances
  • [C] short wave broadcasts are made nearby radio stations
  • [D] By convention, short waves are meant for long distances, whereas long waves are reserved for short distances

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Short wave are more energetic than long waves

5)   Which of the following is a non renewable source of energy ?

  • [A] biogas
  • [B] solar
  • [C] wind
  • [D] coal

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coal

6)   In a refrigerator what produces the cooling ?

  • [A] the ice which deposits on the freezer
  • [B] the suddenly expansion of compressed gas
  • [C] the evaporation of a volatile liquid
  • [D] none of these

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none of these

7)   Which one of the following is used for sun glasses ?

  • [A] Pyrex glass
  • [B] Flint glass
  • [C] Crooks glass
  • [D] Crystal glass

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Crooks glass

8)   When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of

  • [A] evaporation
  • [B] vaporisation
  • [C] diffusion
  • [D] sublimation

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diffusion

9)   Electron microscope was invented by

  • [A] Knoll and Ruska
  • [B] Robert Koch
  • [C] Leeuwenhock
  • [D] CP Swanson

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Knoll and Ruska

10)   A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle ?

  • [A] circle
  • [B] parabolic
  • [C] great circle
  • [D] hyper parabolic

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parabolic

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