The ratio of the total surface area of a sphere and a hemisphere of same radius is 2:1      (b)  3:2          (c)  4:1        (d)  4:3

Explanation

Total surface area of a sphere`=4pir^2`
total surface area of a hemisphere`=3pir^2`
Ratio`=4pir^2:3pir^2=4:3`
so option d is correct.