Question # 1

If E = { } , then P(E)

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∅

{ }

{(2),(4),(6)....}

(∅)

The multiplicative inverse of -1 in the set {1-,1} is

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1

-1

±1

0

Does not exist

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The complement of set A relative to universal set U is the set

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If A is a set then any subset R of A x A is called

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relation on A

relation on B

relation from A to B

relation from B to A

If x = 1/x for x ∈ R then the value of x is

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±1

0

2

4

The set { {a, b} } is

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Infinite set

Singleton set

Two points set

Empty set

Which of the following is the subset of all sets?

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A = B if

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A is equivalent to B

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Singleton set

A set with two points

Empty set

None of these

Z is the set of integers (Z.*) is a group with a * b = a +b +1, a,b ∈ G.then inverse of a is

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-a

a +1

-1-a

None of these

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none of these

The contra positive of p → q is

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q → p

~q→~q

~p→~q

None of these

If A∩B=B, then n(A∩B) is equal to

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n(a)

n(a)+n(c)

n(c)

None of these

The set {1,-1, i, -i} form a group under

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Addition

Multiplication

Subtraction

None

The set {{a,b}} is

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Infinite set

Singleton set

Two points set

None

The set {Z\ {0} } is group w.r.t

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Addition

Multiplication

Division

Subtraction

The set of the first elements of the orders pairs forming a relation is called its

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Relation in B

Range

Domain

Relation In A

A function whose range is just one elements is called

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One-one function

Constant function

Onto function

Identity function

A conditional is regarded as false only when the antecedent is true and consequent is

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True

False

Known

Unknown

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ECAT Mathematics Chapter 23 MCQs With Answers

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