UPSC General Studies Sample Paper General Studies Sample Paper-8

  • question_answer
    Tritium, an isotope of hydrogen is radioactive in nature and finds its use in
    1. compasses                
    2. watch faces
    3. glowing gun sights      
    4. porcelain teeth
    5. smoke detector
    Select the correct answer using the codes given below.

    A)  1, 2 and 3        

    B)  2, 3 and 4         

    C)  3, 4 and 5        

    D)  2, 4 and 5

    Correct Answer: A

    Solution :

    [a] By mixing Tritium with a chemical that emits light in the presence of radiation a continuous light source is made. This is applied to situations where a light is needed but where use of batteries or electricity is not practical. Wrist watch faces, riffle sights and exit signs are all examples of where this phenomenon is commonly used.

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