Question

Which of the following are perfect squares?

• A. 156
• B. 176
• C. 196
• D. 256

Answer 1

Answer: (C), (D)

256

The square root of a perfect square is a natural number.
$\sqrt{196}$ = $\sqrt{14\times 14}$ = 14

$\sqrt{256}$ = $\sqrt{16\times 16}$ = 16

Whereas 156 and 176 are not the perfect squares.
Hence, 196 and 256 are perfect squares as they are squares of 14 and 16 respectively.