Question

Match the Column I with Column II

	Column I Event		Column II Time Interval (s)
(A)	Life time of an excited state of an atom	(p)	1017
(B)	Average human life Span	(q)	1011
(C)	Age of Egyptian Pyramids	(r)	109
(D)	Age of the universe	(s)	10-8

• A. A – s, B – r, C – q, D – p
• B. A – p, B – q, C – r, D – s
• C. A – q, B – p, C – s, D – r
• D. A – r, B – s, C – p, D – q

Answer 1

Answer: (A)

A – s, B – r, C – q, D – p

Answer 2

Life time of an excited state of an atom : $10^{- 8}s$

Average human life – span : $10^{9}s$

Age of Egyptian pyramides : $10^{11}s$

Age of the universe : $10^{17}s$