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ECAT Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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1
-1
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Question # 2
3/4 is ______
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An odd number
An even number
A natural number
A rational number
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Question # 3
What is the conjugate of -7 -2i ?
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-7 + 2i
7 +2i
7 -2i
√53
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Question # 4
3.5+5.4=5.4+3.5 =8.9 this property of addition is called
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additive identity
assoclative property
commulative property
closure property
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Question # 5
a.a
-1
= a
-1
.a = 1 is a
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Commutative law of multiplication
Multiplicative identity
Associative law of multiplication
Multiplicative inverse
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Question # 6
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Question # 7
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None of these
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Question # 8
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Associate law of addition
Commutative law of addition
Additive identity
Closure law of addition
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Question # 9
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Question # 10
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Closure law of addition
Closure law of multiplication
Commutative law of addition
Commutative law of multiplication
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Question # 11
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 # 12
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x
y
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Question # 13
The set {1,2,3,4......} is called
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Set of natural numbers
Set of whole numbers
Set of rational number
Set of irrational numbers
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Question # 14
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Question # 15
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Question # 16
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Reflexive property
Symmetric property
Transitive property
Additive property
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Question # 17
(7,9) +(3,-5) =
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(4,4)
(10,4)
(9,-5)
(7,3)
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Question # 18
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Question # 19
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Question # 20
The real number system contains.
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Positive Numbers
Negative numbers
Zero
(option a, b and c)
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Question # 21
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z is purely imaginary
a is any complex number
z is real
None of these
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Question # 22
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Question # 23
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Commutative law of addition
Associative law of addition
Additive identity
Additive inverse
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Question # 24
In R, the additive identity is
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0
1
-1
None
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Question # 25
In polar form of complex number r =
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Question # 26
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-8
8
8i
32
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Question # 27
Geometrically, the modulus of a complex number represents its distance from the
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Point (1, 0)
Point (0, 1)
Point (1, 1)
Point (0, 0)
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Question # 28
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Question # 29
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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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Question # 30
∀a,b, c ε R,a +c = b + c = > a = b
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Reflexive property
Symmetric property
Cancellations property w.r.t. addition
Transitive property
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Question # 31
The additive inverse of 1 is
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1
-1
0
Does not exist
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