Find the square root of 1600.
1600 units digit is 0.
Since perfect square nos. contain units place 1,4,5,6,9 and even number of 0.
It satisfies the rule.
Therefore, option A is the correct answer.
Now find the square root of these numbers. (You can use our table of squares)
(i) 100
(ii) 256
(iii)
(iv)
(v) 1.44
(c) 0.01