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What is newton third law of motion ?

  • Every body maintains its initial state rest or motion unless no external force is applied.
  • The rate of change in momentum of a body is directly proportional to the applied force on the body and takes place in the direction of force.
  • To every action there is equal and opposite reaction.
  • None of above.
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1. What are audible sound waves ?

  • Having frequency less than 20 Hz
  • Having frequency between 20 Hz to 20000 Hz
  • Having frequency more than 20000 Hz
  • None of above

2. The rotational effect of a force on a body about an axis of rotation is described in terms of

  • Centre of gravity
  • Centripetal force
  • Centrifugal force
  • Moment of force

3. The incident ray, reflected ray and normal to the reflecting surface at the incident point all never lie in same plane.

  • True
  • False

4. Which instrument is used to measure depth of ocean ?

  • Galvanometer
  • Fluxmeter
  • Endoscope
  • Fathometer

5. If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this ?

  • Newton first law
  • Newton second law
  • Newton third law
  • Principle of conservation of linear momentum
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