Higher Study | Quantitative Aptitude | Number System

Which one is incorrect?
Which one is different from the rest?
Which one of the following is correct?
What decimal of an hour is a second?
which of the following is not correct ?
Which of the following is not true?
what is the product of all the numbers in the dial of a telephone?
Which of the following is a perfect square?
Which of the following option is correct?
Which expression is true?
Which of the following is not a prime number?
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