The number of significant figures in 0.050 is:
Correct option is B. 2
According to the significant figures rule,
Zeroes to the left of the first non-zero digit are not significant while zeroes at the end but to the right of the decimal point are significant.
So, in the number 0.050 last two digits 5 and 0 are significant. So the no. of the significant figure is 2.