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Radiocarbon is produced in the atmosphere as a result of

  • collision between fast neutrons and nitrogen nuclei present in the atmosphere
  • action of ultraviolet light from the sun on atmospheric oxygen
  • action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
  • lightning discharge in atmosphere

Answer: Option A

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1. Nuclear sizes are expressed in a unit named

  • Fermi
  • Angstrom
  • Newton
  • Tesla

Answer: Option A

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

Answer: Option D

3. Electric Motor converts

  • Electrical energy into mechanical energy
  • Mechanical energy into Electrical energy
  • Electrical energy into light energy
  • None of above

Answer: Option A

4. What is unit of Work and Energy ?

  • Joule
  • kilogram
  • amphere
  • meter

Answer: Option A

5. Lognitudinal waves and Transverse waves are types of ?

  • Mechanical waves
  • Non-Mechanical waves
  • Both of above
  • None of Above

Answer: Option A

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