Question # 1

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

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-2/5

2/5

5/2

Solution of x²= -1 in real numbers:

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-1

+1

Solution does not exist

The conjugate of 6 + 5i.

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-6 + 5i

-6 - 5i

6 + 5i

6 - 5i

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Additive identity

Additive inverse

Multiplicative identiry

Multiplicative inverse

∀ 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'

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x

x⁷

x ^1/7

x^7/2

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5/4

4/5

-5/4

-4/5

Conjugate of 4i - 3 is:

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4i + 3

-4i - 3

-4i + 3

The value of i^{9 is:}

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1

-1

i

-i

Every real number is also a complex number with imaginary part as ______

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1

b

O

10

Set of Real numbers =

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Q

Q'

QႶQ'

QUQ'

The value of (-i)⁸:

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-i

i

1

-1

Imaginary part of -i (3i+2) is:

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-2

2

3

-3

The conjugate of 5+ 4i is:

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-5 +4i

-5 - 4i

5 - 4i

5 + 4i

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Mathematics 9th Class English Medium Unit 2 Online Test MCQs With Answers

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