NCERT Class 9th Math chapter 1 MCQ Question Answer and can take online test here.. CCL Chapter helps you in it.. NCERT Solution for Class 9 Maths Chapter 1 MCQ of Number System NCERT Solution for CBSE, HBSE, RBSE and Up Board and all other chapters of class 9 math.

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NCERT Class 9 Math chapter 1 Number System MCQ Question Answer with Online test of Objective type Solution.

**Class 9 Math Chapter 1 MCQ Question Answer**

**1. Which of the following pair is co prime?**

**(A)** 2, 11

**(B)** 5, 6

**(C)** 7, 8

**(D)** all of the above

**Answer**

**Ans. (D) all of the above**

**2. Which of the following is not true?**

**(A)** Every natural number is a whole number.

**(B)** Every natural number is a rational number.

**(C)** Every whole number is a natural number.

**(D)** Every whole number is a rational number.

**Answer**

**Ans. (C) Every whole number is a natural number.**

**3. Which of the following is a rational number?**

**(A)** √2

**(B)** √3

**(C)** √4

**(D)** π

**Answer**

**Ans. (C) √4**

**4. Which of the following is true representation of 1.27**

**(A)** 127/100

**(B)** 27/100

**(C)** 227/100

**(D)** 327/100

**Answer**

**Ans. (A) 127/100**

**5. Addition of 2√2 + 5√3 and √2 – 3√3 is**

**(A)** 3√2 + 2√3

**(B)** √2 + √3

**(C)** √2 + 5√3

**(D)** 3√2 – 5√3

**Answer**

**Ans. (A) 3√2 + 2√3**

**6. Rationalization of 1/(2 + √3) is**

**(A)** √3 – 2

**(B)** 2 – √3

**(C)** 2 + √3

**(D)** 2 + √5

**Answer**

**Ans. (B) 2 – √3**

**7. a ^{p}.a^{q} is equal to**

**(A)**a

^{p+q}

**(B)**a

^{pq}

**(C)**a

^{p-q}

**(D)**none of the above.

**Answer**

**Ans. (A) a ^{p+q}**

**8. Value of 64 ^{1}^{/2} is**

**(A)**4

**(B)**8

**(C)**16

**(D)**32

**Answer**

**Ans. (B) 8**

**9. If r is rational and s is irrational then which of the following is irrational?**

**(A)** r + s

**(B)** r – s

**(C)** rs

**(D)** all of the above.

**Answer**

**Ans. (D) all of the above. Also r/s or s/r is also irrational.**