Answer: √3 and √2 are irrational numbers;
and 0 are rational numbers.
Step-by-step explanation: We are given to classify the following numbers as rational or irrational:

Rational number: The digits after the decimal are either repeating or terminating.
Irrational number: The digits after the decimal are non-terminating and non-terminating.
(a) We have

Since the digits after the decimal are non-terminating and non-repeating, so √3 is an IRRATIONAL number.
(b) We have

Since the digits after the decimal are terminating, so
is a RATIONAL number.
(c) We have

Since the digits after the decimal are terminating, so
is a RATIONAL number.
(d) We have

Since the digits after the decimal are non-terminating and non-repeating, so √2 is an IRRATIONAL number.