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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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real number
complex number
rational number
irrational number
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Question # 2
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Question # 3
a.a
-1
= a
-1
.a = 1 is a
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Commutative law of multiplication
Multiplication identity
Associative law of multiplication
Multiplication inverse
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Question # 4
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1
-1
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Question # 5
∀x, y ∈ R, either x = y or x > y or x < y is
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Transitive property
Reflexive property
Trichotomy property
None of these
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Question # 6
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Question # 7
Multiplicative inverse of "1" is
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0
±1
1
{0,1}
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Question # 8
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1
3
2-i
-1
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Question # 9
Which of the following has the same value as i
113
?
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i
-1
-i
1
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Question # 10
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1
-i
i
0
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Question # 11
i
9
=
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i
2
-1
1
i
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Question # 12
If Z
1
= 1+ i, Z
2
= 2+3i , then |Z
1
-Z
2
| =?
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√5
√7
-1-2i
√3
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Question # 13
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Question # 14
i
2
=
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1
2
-1
0
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Question # 15
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-3 -2i
3 +2i
1 + 2i
1 - 2i
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Question # 16
i =
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Question # 17
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Question # 18
202.04 is an example of
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Recurring decimals
Non-recurring decimals
Terminating decimals
None of above
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Question # 19
4/√49 is a
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Irrational Number
Prime Number
Rational number
Whole number
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Question # 20
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
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Question # 21
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Question # 22
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Question # 23
If z=(x,y) then z has no multiplicative inverse when
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x ≠ 0, y = 0
x = 0, y = 0
x = 0, y ≠ 0
None of these
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Question # 24
The multiplicative inverse of (a,b) is
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Question # 25
In (x + iy) x is the known as
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Imaginary part of complex number
Real part of complex number
Complex number
None of above
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Question # 26
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 # 27
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Question # 28
π is ______
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A complex number
A rational number
A natural number
An irrational number
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Question # 29
3/2 is
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An irrational number
Whole number
A positive integer
A rational number
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Question # 30
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Additive property of inequality
Commutative property
Additive inverse
Additive identity
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Question # 31
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