Question

The average life of an Indian is 56 years. Find the number of times the human heart beats in the life of an Indian, if the heat beats once in 0.8 s.

(a) 20.4×10^9 times

(b) 2.5×10^9 times

(c) 2.2×10^9 times

(d) 6.1×10^9 times

This question was addressed to me in an online quiz.

The doubt is from Dimensions of a Physical Quantity topic in section Advanced Engineering Materials of Engineering Physics II

Answer 1

Correct choice is (c) 2.2×10^9 times

Easiest explanation: Average life of an Indian = 56 years = 56×365.25×24×60×60 s

Period of heart beat = 0.8 s

Total number of heart beats in 56 years = (56×365.25×24×60×60)/0.8 = 2.2×10^9 times.