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ECAT Mathematics Chapter 23 MCQs With Answers
Question # 1
The multiplicative inverse of -1 in the set {1-,1} is
Choose an answer
1
-1
±1
0
Does not exist
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Question # 2
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 # 3
Group of none-singular matrices under multiplication is
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None-Abelian group
Semi group
Abelian group
None of these
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Question # 4
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A = C
A = B
B = C
None of these
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Question # 5
G = {e, a, b, c} is an Abelian group with e as identity element The order of the other elements are
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2,2,2
3,3,3
2,2,4
2,3,4
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Question # 6
The set {{a,b}} is
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Infinite set
Singleton set
Two points set
None
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Question # 7
The set of natural is a semi group w.r.t
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Addition
Division
Subtraction
None of these
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Question # 8
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A
A'
U
None of these
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Question # 9
Empty set is
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Not the member of real numbers
Infinite set
Finite set
Not subset of every set
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Question # 10
The set (Z,+) forms a group
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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
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Question # 11
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A
B
A'
None of these
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Question # 12
The multiplicative inverse of -1 in the set {1-, 1} is
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1
-1
0
Does not exist
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Question # 13
If there is one-one correspondence between A and B, then we write.
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A = B
A⊆ B
A⊇ B
A ∼ B
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Question # 14
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1/x
-x
2x
0.5 x
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Question # 15
The identity element of a set X with respect to intersection in P(x) is
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X
Does not exist
∅
None of these
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Question # 16
(A ∩ B)c =
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A∩ B
(A ∪ B)c
Ac∪Bc
Φ
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Question # 17
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Question # 18
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Question # 19
The set { {a,b} } is
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Infinite set
Singleton set
Two points set
Empty set
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Question # 20
The set Q
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Forms a group under addition
Does not form a group
Contains no additive indentity
Contains no additive inverse
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Question # 21
Every set is an improper subset of
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Empty set
Equivalent set
Itself
Singleton set
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