1.

Match the column I with column II ltBrgt A. A-s,B-r,C-q,D-pB. A-p,B-q,C-r,D-sC. A-q,B-p,C-s,D-rD. A-r,B-s,C-p,D-q

Answer» Correct Answer - A
Life time of an excited state of an atom `:10^(-8)s`
Average human life-span `:10^(9)s`
Age of Egyptian pyramids `:10^(11)s`
Age of the universe `:10^(17)s`


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