**1. Which of the following is a natural number?**

A) -9 B)0 C) 1 D) 5.25** **

Ans: Zero, negative integers & fractions are not natural numbers. Only positive integers are natural numbers. Ans: (C)

**2. Which of the following is a prime number?**

**A**) 2 **B) 0 C) 1 D) 143**

Ans: 143/11=13. 0&1 are not primes by definition. 2 is a prime. Hence the answer is A.

**3. Which of the following is a real number?**
A) -7 B) 3.5 C) -3*1\3 D)All

**Ans: **Any number that can be represented in the number line is a real number. Here the numbers are real. So, the answer is D.

**4. Which of the following is an irrational number?**
A) 5 B)

**√** 2 C) 5.75 D

**) **6.66666

Ans:

**√**2 can't be expressed as the ratio of two integers. Hence this is an irrational number. So, the answer is B.

**5. Which one is correct?**
A) -3>-2 B) /3/>/-3/ C) 4<3 D) -3<-2

Ans: Let us plot al the numbers in the number line.

We know that as we move right along the number line, the numbers grow larger. So, options A & C are false. From the definition of absolute value we know that, /3/=3=/-3/

So, B is also false. D is correct.

**6. If n is an integer, which of the following must be odd?**
A) n B) 2n C) n+2 D) 2n+1

Ans: IN general, an odd integer can be represented as 2n +1 . So, the answer is D.

**7. If an is an even integer, which of the following must be3 an odd integer**
A) 7n-2 B) 5(n-2) C) (16n+24)/8 D) (6n+24)/3

Ans: 7n-2=7 x even -2=even

5(n-2)=5 (even-2)=5 x even=even

(16n+24)/8= 2n+3=2 x even + odd= even+ odd=odd

Ans: C

**8. What is the product of the odd integers between -8 and 8 ?**
A) 0 B) 10050 C) 12025 D)

** 5005**
Ans: The odd integers between -8 & 8 are -7,-5,-3,-1,1,3,5,7. Their product is 11025. Hence C is the answer. Zero is an even integer.

** **
(6n+12)/3=2n+4= 2 x even+even = even+even = even

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