Question # 1

If Z₁ = 1+ i, Z₂ = 2+3i , then |Z₁ -Z₂| =?

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√5

√7

-1-2i

√3

Name the property used in a (b-c) = ab - ac

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commutative property of multiplication

distributive property of multiplication

associative property of multiplication

multiplicative inverse

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(a + b)c = a . c + bc

a + b = b + a

(a + b) + c = a + (b + c)

a(b+ c) = ab + ac

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The multiplicative inverse of 1 is

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1

-1

0

Does not exist

The additive inverse of 1 is

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1

-1

0

Does not exist

Multiplicative inverse of "1" is

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0

±1

1

{0,1}

The square root of 2i - 20i is

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+-(5 - 2i)

+-(5 + 2i)

(5 - 2i)

None of these

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N

r

2r

π

3/4 is ______

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An odd number

An even number

A natural number

A rational number

A subset of set of complex number whose elements are of the form (a,0) is called

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Real number

Complex number

Rational number

Irrational number

Additive inverse of - a - b is

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a

-a + b

a - b

a + b

The additive identity of real number is

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1

2

1/2

0

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Associate law of addition

Commutative law of addition

Additive identity

Closure law of addition

(7, 9) + (3, -5) =

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(4, 4)

(10, 4)

(9, -5)

(7, 3)

0 (zero) is

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An irrational number

A rational number

A negative integer

A positive number

The square roots of negative numbers is called

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Real no

Complex no

Positive no

Negative no

2/9,5/7∈ R,(2│9)(5│7)=10/63∈R this property is called

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Associative property

Identity property

Commutative property

Closure property w.r.t multiplication

In R, the additive inverse of a is

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0

1

-a

1/a

If P is a whole number greater than 1, which has only P and I are factors. Then P is called

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Wholw number

Prime number

Even number

Odd number

Decimal part of irrational number is

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Terminating

Repeating only

Neither repeating nor terminating

Repeating and terminating

i² =

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1

2

-1

0

Such fraction which can not be written in the form ofp⁄q where p,q and q≠ 0,such fractions are called.

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Fractinal numbers

Rational Numbers

Even Numbers

Whole Numbers

√2 +√3 +√5) = (√2 +√3 +√5: this property is called

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associative property w.r.t addition

commutative property

Closure property w.r.t addition

Additive identity

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Closure law of addition

Associative law of addition

Commutative law of multiplication

Associative law of multiplication

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A rational number

A irrational number

An even integer

A factor of 36

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additive property

multiplicative property

additive inverse

additive identity

If z₁ = 1 + 2i, z₂ = 3 + 4i then

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z₁ > z₂

z₁ = z₂

z₁ < z₂

None of these

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Rational

Irrational

Natural

Odd

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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers

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