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ECAT Mathematics Chapter 23 MCQs With Answers
Question # 1
The set {-1, 1} is closed under the binary operation of
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Addition
Multiplication
Subtraction
Division
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Question # 2
The set {{a,b}} is
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Infinite set
Singleton set
Two points set
None
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Question # 3
The set of complex numbers forms
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Commutative group w.r.t addition
Commutative group w.r.t multiplication
Commutative group w.r.t division
Non commutative group w.r.t addition
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Question # 4
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Question # 5
The graph of a quadratic function is
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Circle
Ellipse
Parabola
Hexagon
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Question # 6
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An empty set
Universal set
A singleton set
None of these
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Question # 7
If n(A) = n then n(P(A)) is
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2n
n
2
n/2
2
n
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Question # 8
For a set A, A∪Ac= ---------------------
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A
∅
Ac
U
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Question # 9
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Question # 10
Additive inverse of -a -b is
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a
-a + b
a - b
a + b
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Question # 11
A - B = ______
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Question # 12
For any set B, BUB' is
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Is set B
Set B'
Universal set
None of these
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Question # 13
The multiplicative inverse of x such that x = 0 is
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-x
does not exist
1/x
0
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Question # 14
If A = {2m/m
3
= 8 , m€ Z} then A =
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{1,8,27}
{4}
(2,4,6}
{2,16,54}
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Question # 15
Power set of X i.e P(X) _______ under the binary operation of union U
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Forms a group
Does not form a group
Has no identity element
Infinite set although X is infinite
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Question # 16
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A finite set
An infinite set
An empty set
None of these
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Question # 17
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A
B
U
None of these
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Question # 18
Z is a group under
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Subtraction
Multiplication
Addition
None of these
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Question # 19
A conjunction of two statement p and q is true only if
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p is true
q is true
Both p and q are true
both p and q are false
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Question # 20
Every subset of a finite set is
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Disjoint
Null
Finite
Infinite
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Question # 21
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