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ECAT Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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Associative law of multiplication
Commutative law of addition
Commutative law of multiplication
Associative law of addition
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Question # 2
If z = (x,y) , then z ̅ =
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(-x,y)
(x,-y)
(-x, -y)
None of these
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Question # 3
(a, b) + (-a, -b) =
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(0,0)
(a, b)
(-a, -b)
(1, 1)
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Question # 4
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Commutative law of multiplication
Closure law of multiplication
Associative law of multiplication
Multiplication identity
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Question # 5
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Set of whole number
Rational Numbers
Complex numbers
Whole numbers
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Question # 6
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Question # 7
The square roots of negative numbers is called
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Real no
Complex no
Positive no
Negative no
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Question # 8
∀ a ε R ∃ o ε R such that a + v = 0 + a = a is property of
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Commutative law of addition
Associative law of addition
Additive identity
Additive inverse
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Question # 9
In polar form of complex number r =
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Question # 10
The symbol of irrational is
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W
N
Q
Q
'
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Question # 11
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Question # 12
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Reflexive property
Symmetric property
Transitive property
Additive property
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Question # 13
The real number system contains.
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Positive Numbers
Negative numbers
Zero
(option a, b and c)
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Question # 14
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x
y
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Question # 15
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Question # 16
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 # 17
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(a + b)c = ac + bc
a + b = b + a
(a + b) + c = a + (b + c)
a(b +c) = ab + ac
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Question # 18
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 # 19
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Question # 20
In R, the additive inverse of a is
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0
1
-a
1/a
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Question # 21
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Principle of equality of fractions
Rule for product of fractions
Golden rule of fractions
Rule for quotient of fractions
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Question # 22
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
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Question # 23
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Question # 24
Any whole number can be written as a product of factors which are
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Even number
Odd numbers
Prime number
Rational number
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Question # 25
Associative law of multiplication
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ab = ba
a(bc) = (ab) c
a(b+c) = ab + ac
(a + b)c = ac + bc
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Question # 26
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 # 27
The additive identity of real number is
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1
2
1/2
0
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Question # 28
The value of x and y when (x + iy)2 = 5 - 4i
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x = 2, y = -1
x = -2, y = 1
x = 2, y = -i
x = 2, y = 2
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Question # 29
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Question # 30
3/2 is
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An irrational number
Whole number
A positive integer
A rational number
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