Number System-Class 9

In between any two numbers, there are:

• Only one rational number

• Two rational numbers

• Infinite rational numbers

• No rational number

3√6 + 4√6 is equal to:

• 6√6

• 7√6

• 4√12

• 7√12

Which of the following is equal to x3?

• x6 – x3

• x6.x3

• x6/x3

• (x6)3

The decimal expansion of √2 is

• finite decimal

• 1.4121

• non-terminating recurring

• non-terminating non-recurring

(√a + √b) (√a – √b) is

• a + b

• a – b

• 2√a

• 2√b

A rational number lying between √2 and √3 is

• √6

• 1.6

• 1.9

• None of the above

Every rational number is:

• Whole number

• Natural number

• Integer

• Real number

√6 x √27 is equal to:

• 9√2

• 3√3

• 2√2

• 9√3

The product of a rational and an irrational numbers is:

• Always an integer

• Always a rational number

• Always an irrational number

• Sometimes rational and sometimes irrational

From the choices given below mark the co-prime numbers

• 2, 3

• 2, 4

• 2, 6

• 2, 110