2. Sample Papers
  3. 9th Class
  4. General Knowledge

9th Class General Knowledge Sample Paper General Knowledge Olympiad Model Test Paper-4

  • question_answer
    'Air conditioning' was invented by:

    A)  S. M. Carrier                

    B)  W. H. Carrier

    C)  J.S.-Colt                      

    D)  T. Jefferson

    E)  None of these

    Correct Answer: B

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