1 
the set {0,<span style="color: rgb(34, 34, 34); fontfamily: arial, sansserif; fontsize: 16px;">±<b>1,</b></span><span style="color: rgb(34, 34, 34); fontfamily: arial, sansserif; fontsize: 16px;">±2,</span><span style="color: rgb(34, 34, 34); fontfamily: arial, sansserif; fontsize: 16px;">±3,........</span>} is: 
 A. Set of natural numbers
 B. Set of whole numbers
 C. Set of prime numbers
 D. Set of integers

2 
The Range of R is, if R = {(1,3),(2,2),(3,1),(4,4)}. 
 A. {1,2,4}
 B. {3,2,4}
 C. {1,2,3,4}
 D. {1,3,4}

3 
If x∈ A and x∈ B, then {x} is equal to . 
 A. A  B
 B. A<sup>c</sup>
 C. A∩ B
 D. B<sup>c</sup>

4 
The harmonic mean of the observation 0,15,12, is: 
 A. 3.7
 B. 7.3
 C. 6.7
 D. no harmonic mean

5 
A set with no element is called. 
 A. Subset
 B. Empty set
 C. Singleton set
 D. Super set

6 
Which of the following is complete description of Real numbers? 
 A. N∪ W = R
 B. O∪ E = R
 C. P∪ Q = R
 D. Q∪ Q' = R

7 
Collection of distinct objects. 
 A. Subset
 B. Power set
 C. Set
 D. None of the

8 
A collection of welldefined distinct objects is called. 
 A. subset
 B. Power set
 C. Set
 D. None of these

9 
If number of elements in set A is 3 and in set B is 4 then number of elements in AxB is: 

10 
If set a has 3 elements and B has 4 then A x B has __________ elements. 
