Which of the numbers is not a perfect square?

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256

122

1024

answer is B.

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Detailed Solution

The given numbers are 256, 122, 1024 and 16.
It is required to find whether the given numbers are not perfect squares.
The digits 0, 1, 4, 5, 6, or 9 may come at the unit’s place of the perfect square number.
The numbers 2, 3, 7, or 8 could come at the unit’s place of the imperfect square number.
Check the given options,
The number 122 is not a perfect square because it has a 2 in its unit position.
The number 256, 16 and 1024 has 6, 6 and 4 at its unit’s place and hence these numbers are perfect squares.
Therefore, 122 is not a perfect square.
Hence, option 2 is correct.

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