Explanation:
Out of the given options, only √196 is a rational number.
A rational number is a number that can be expressed as the ratio of two integers. In other words, it can be written in the form of p/q where p and q are integers and q is not equal to zero.
√56 cannot be simplified further and has no integer factors that can be canceled out to express it as a ratio of two integers. Therefore, it is an irrational number.
Similarly, √63 and √240 cannot be simplified further and do not have any integer factors that can be canceled out to express them as a ratio of two integers. Therefore, they are also irrational numbers.
On the other hand, √196 simplifies to 14 which is a ratio of two integers (14/1). Hence, it is a rational number.
In summary, only √196 is a rational number out of the given options.