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Online Tests

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

Question # 1

∀x,y∈R and x> 0 , y>0, if x > y

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None of these

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Question # 2

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Question # 3

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Question # 4

What is the conjugate of -6 -i

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-6 +i

6 + i

-6 -i

6 -i

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Question # 5

The sum of complex number (a,b) and (c,d) is

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Question # 6

i² =

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1

2

-1

0

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Question # 7

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A prime number

An integer

A whole number

An irrational number

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Question # 8

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Associative property of addition

Associative property of multiplication

Commutative property of addition

Commutative property of multiplication

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Question # 9

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Question # 10

√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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Question # 11

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Question # 12

The equation |x +4| = x has solution

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x = -2

x = 2

x = -4

x = 4

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Question # 13

Every real number is

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A complex number

A rational number

A natural number

A prime number

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Question # 14

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Question # 15

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are real no

both are not real

are imaginary no

both are imaginary

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Question # 16

(√3+√5)+√7 = √3 +(√5 +√7) property used in above is

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Commutative property of addition

Closure property of addition

Additive inverse

Associative property w.r.t to adition

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Question # 17

The multiplicative inverse of 1 is

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1

-1

0

Does not exist

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Question # 18

The square root of 2i - 20i is

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±(5 - 2i)

±(5+ 2i)

(5 - 2i)

None of these

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Question # 19

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Question # 20

6 is

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A prime integar

An irrational number

A rational number

An odd integer

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Question # 21

14 is not a

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Prime number

Whole number

Even number

Real number

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Question # 22

The additive inverse of 2/3 is

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3/2

-2/3

-3/2

0

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Question # 23

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

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Question # 24

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Question # 25

If z₁ =√-36 ,z₂ =√-25,z3 =√-16 then

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15

15i

-15i

-15

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Question # 26

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Question # 27

In polar form of complex number r =

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Question # 28

In R the right cancellation property w.r.t. addition is

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Question # 29

Union of the sets of rational and irrational numbers is called 6th set of

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Natural numbers

Real numbers

Whole numbers

Prime numbers

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Question # 30

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1

-1

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