ECAT Mathematics Chapter 23 With Answers

image
image
image

ECAT Mathematics Chapter 23

Sr. # Questions Answers Choice
1 {x : xε Z and x < 1} is Singleton set A set with two points Empty set None of these
2 Φ set is the _______ of all sets Subset Union Universal Intersection
3 The set {-1,1} is closed under the binary operation of Addition Multiplication Subtraction Division
4 If x = 1/x for x ∈ R then the value of x is ±1 0 2 4
5 Let A,B and C be any sets such that A∪B = A∪C and A∩ B = A∩ C then A = B B = C A≠ C A ≠ B
6 If n(X) = 18, n(X∩Y) = 7, n(X∪ Y) = 40 then n(Y) = 1 12 5 29
7 Given X.Y are any two sets such that number of elements in X = 18, number of elements in set Y = 24,and number of elements in set X∪ Y =40,then number of elements in set x∩ Y = 3 1 2 4
8 If A ⊆ B then A ∪ B is A B A' A ∩B
9 For any set B,B∪B' is Is set B Set B' Universal set
10 The set (Z,+) forms a group Forms a group w.r.t addition Non commutative group w.r.t multiplication Forms a group w.r.t multiplication Doesn't form a group
11 The set Q Forms a group under addition Does not form a group Contains no additive indentity Contains no additive inverse
12 The statement that a group can have more than one identity elements is True False Fallacious Some times true
13 The set of all positive even integers is Not a group A group w.r.t subtraction A group w.r.t division A group w.r.t multiplication
14 The set {1,-1, i, -i} form a group under Addition Multiplication Subtraction None
15 The multiplicative inverse of -1 in the set {1-,1} is 1 -1 ±1 0 Does not exist
16 The set of complex numbers forms a group under the binary operation of Addition none of these Division Subtraction
17 The set of the first elements of the ordered pairs forming a relation is called its Function on B Range Domain A into B
18 The set {{a,b}} is Infinite set Singleton set Two points set None
19 Which of the following is the subset of all sets Φ {1,2,3} {Φ} {0}
20 The multiplicative inverse of x such that x = 0 is -x Does not exist 1/x ±1
Download This Set
×