Question

If ${16}^2=256$, then which of the following is not a perfect square?

• A. $\sqrt{3.69-1.13}$
• B. $\sqrt{0.00256}$
• C. $\sqrt{12.8÷5}$
• D. $\sqrt{0.0256}$

Answer 1

The correct option is B $\sqrt{0.00256}$

$\sqrt{0.0256}=0.16$

$\sqrt{3.69-1.14}=\sqrt{2.56}=1.6$

$\sqrt{12.8÷5}=\sqrt{2.56}=1.6$

So, $\sqrt{0.00256}$ is not a perfect square.

Thus, option (a) is correct.