Question # 1

The set {-1, 1} is closed under the binary operation of

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Addition

Multiplication

Subtraction

Division

The set {{a,b}} is

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Infinite set

Singleton set

Two points set

None

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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The graph of a quadratic function is

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Circle

Ellipse

Parabola

Hexagon

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An empty set

Universal set

A singleton set

None of these

If n(A) = n then n(P(A)) is

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2n

n²

n/2

2ⁿ

For a set A, A∪Ac= ---------------------

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A

∅

Ac

U

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Additive inverse of -a -b is

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a

-a + b

a - b

a + b

A - B = ______

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For any set B, BUB' is

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Is set B

Set B'

Universal set

None of these

The multiplicative inverse of x such that x = 0 is

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-x

does not exist

1/x

0

If A = {2m/m³= 8 , m€ Z} then A =

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{1,8,27}

{4}

(2,4,6}

{2,16,54}

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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A finite set

An infinite set

An empty set

None of these

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A

B

U

None of these

Z is a group under

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Subtraction

Multiplication

Addition

None of these

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

Every subset of a finite set is

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Disjoint

Null

Finite

Infinite

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ECAT Mathematics Chapter 23 MCQs With Answers

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