Question # 1

∀ a,b∈ R, a + b = b + a is _____________ Property of real numbers.

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Closure property w.r.to '+'

Closure property w.r.to 'x'

Commutative property '+'

Commutative property w.r.to 'x'

If Z < 0 then x < y→

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xz < yz

xz > yz

xz = yz

None of these

Conjugate of 4i - 3 is:

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4i + 3

-4i - 3

-4i + 3

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Transtitive

Multiplicative inverse

Multiplicative identity

None

If Z₁ = a + bi and Z₂ = c + di then Z₁.Z₂ =

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ac + bdi

ac - bd

ac - bd + adi + bci

multiplication is not possible

∀ a∈ R⇒ a = a is __________ property:

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Reflexive

Symmetric

Transitive

Additive property

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3

1/3

35

None of these

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-2/5

2/5

5/2

Set of Real numbers =

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Q

Q'

QႶQ'

QUQ'

∀ a∈ R⇒ a + o = a = o + a, then O is called:

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Multiplicative identity

Additive identity

Additive inverse

Multiplicative inverse

Conjugate of -3 is:

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3

-3

-3i

3i

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5/4

4/5

-5/4

-4/5

Which of the following is closure property w.r.to multiplications:

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a + b∈ R∀ a, b∈ R

a. b∈ R∀ a, b∈ R

a + b = b + a∀a,b∈ R

a.b = b.a∀a,b∈ R

Every real number is:

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a Positive integer

a rational number

a negative integer

a complex number

The value of (-i)⁸:

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-i

i

1

-1

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9th Class Mathematics Chapter 2 Real and Complex numbers English Medium KPK Boards Online Mcqs MCQs With Answers

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