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UPSC Physics Heat Question Bank Sound, Oscillations, Heat and Thermodynamics

  • question_answer
          Which one of the following types of waves are used in a night vision apparatus?                                  [IAS Prelim]

    A) Radio waves     

    B)      Microwaves

    C) Infra-red waves  

    D)      None of the above

    Correct Answer: C

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