UPSC General Studies Sample Paper General Studies Sample Paper-3

  • question_answer
    Which of the following statement(s) is / are correct with respect to cosmic rays?            
    1. They are made up of only positively charged particles.                                      
    2. The major source of cosmic rays in universe is Sun.                                        
    3. They cause ozone depletion.                                                           
    Select the correct answer using the codes given below.                                 

    A)  1 and 2           

    B)  2 and 3               

    C)                   Only 3             

    D)  All of these                           

    Correct Answer: C

    Solution :

    [c] Almost 90% of cosmic rays are protons, about 9% are helium nuclei (alpha particles) and nearly 1% are 5-ectrons. This means that cosmic rays are not made up of only positively charged particles. Cosmic rays may broadly be divided into two categories: primary and secondary. The cosmic rays that originate from astrophysical sources are primary cosmic rays; these primary cosmic ray interact with interstellar matter creating secondary cosmic rays. Sun is not the major source but exactly is a minor source.

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