Rational numbers Multiple Choice Questions and Answers

1. Which of the following is the identity element?

1. 1
2. -1
3. Zero

2. -(-x) is same as

1. -x
2. x
3. 1/x
4. -1/x

3. A number of the form p/q is said to be a rational number if

1. p and q are integers
2. p and q are integers and p is not qual to zero.
3. p and q are integers and q is not qual to zero.
4. p and q are integers and p and q both are not equal to zero.

4. Addition is associative for

1. Natural numbers
2. Whole Numbers
3. Rational Numbers
4. All of these

5. Between any two rational numbers, there lie:

1. two rational number
2. No rational number
3. infinite rational numbers
4. infinite fractions

6. If x be any rational number, than x+0 is

1. x
2. -x
3. Not defined

7. If y be the reciprocal of rational number x, then the reciprocal of y will be

1. x
2. y
3. x/y
4. y/x

8. One (1) is

1. the identity for addition of the rational number
2. the identity for subtraction of the rational number
3. the identity for multiplication of the rational number
4. the identity for division of the rational number

9. Rational numbers are not closed under

1. Subtraction
2. Division
3. Addition
4. Multiplication

10. The additive inverse of a/b is

1. -b/a
2. b/a
3. a/b
4. -a/b