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ECAT Mathematics Chapter 23 MCQs With Answers
Question # 1
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Question # 2
The set {-1,1} is closed under the binary operation of
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Addition
Multiplication
Subtraction
Division
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Question # 3
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 # 4
The set {1,-1,i,-i}
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Form a group w.r.t addition
Form a group w.r.t multiplication
Does not form a group w.r.t multiplication
Not closed under multiplication
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Question # 5
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a constant function
linear function
quadratic funtion
none of these
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Question # 6
If S = {3,6,9,12.......}, then
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S = Four multiples of 3
S = Set of even numbers
S = Set of prime numbers
S = All multiples of 3
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Question # 7
If B-A≠φ , then n(B-A) is equal to
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n(a)+n(c)
n(c)-n(a)
n(a)-n(c)
None of these
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Question # 8
The set {Z\{0}} is group w.r.t
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Addition
Multiplication
Division
Subtraction
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Question # 9
The negation of a number
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a relation
a function
unary operation
binary operation
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Question # 10
The number of proper subset of A ={a.b.c.d} is
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3
6
8
15
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Question # 11
Multiplicative inverse of 0 is
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0
1
+-1
Does not exist
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