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ECAT Pre General Science Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
The value of i
4n+1
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1
-1
i
i
2
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Question # 2
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Associate law of addition
Commutative law of addition
Additive identity
Closure law of addition
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Question # 3
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A prime number
An integer
A whole number
An irrational number
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Question # 4
(a+bi) - (c+di)=
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(a+b) = (c+d)
(a+c) + i(b+d)
(a - c) + (c- d)i
(a - c)+ (b - d)i
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Question # 5
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 # 6
In R, the additive inverse of a is
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0
1
-a
1/a
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Question # 7
If A = {x / x ∈ R ∧ x
2
- 16 = 0} then A =
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- x
Infinite set
Φ
{-4,4}
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Question # 8
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 # 9
(a
-1
)
-1
=
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a
-1
a
-a
None of above
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Question # 10
Every natural number is
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A prime number
An irrational number
An integer
An even number
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Question # 11
Which of the following sets has closure property w.r.t. addition
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{ 0 }
{ 1 }
{ 0, -1}
{ 1, -1}
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Question # 12
Every whole number is
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A real number
An irrational number
A prime number
A negative integer
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Question # 13
Which of the following has the same value as i
113
?
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i
-1
-i
1
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Question # 14
If 0 = R, thenthe additive inverse of a is
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1/9
1/-9
a
-a
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Question # 15
24 can be written as a product of
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Odd factors
Even factors
Whole factors
Prime factors
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Question # 16
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 # 17
0.25 is ______
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An irrational number
A natural number
A prime number
A rational number
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Question # 18
The sum of complex number (a,b) and (c,d) is
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Question # 19
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Question # 20
∀a,b,c∈R, a >b ∧ b>c ⇒ a >c is
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Trichotomy property
Transitive property
Symmetric property
Additive property
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Question # 21
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Question # 22
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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 # 23
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Question # 24
The multiplicative inverse of 0 is
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1
-1
0
Does not exist
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Question # 25
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Associative law of addition
Commutative law of addition
Additive identity
Closure law of addition
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Question # 26
Choose an answer
None of these
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Question # 27
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Question # 28
If in a set of real no a is additive identity then
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a+a = 2a
a+a = 1
a+a = 0
None of these
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Question # 29
Some of two real numbers is also a real number , this property is called:
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Commutative property w.r.t addition
Closure property w.r.t. addition
Associative property w.r.t. addition
Distributive property w.r.t addition
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Question # 30
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real number
complex number
rational number
irrational number
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Question # 31
The multiplicative inverse ofx^(-1) is
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x
a-2
0
1
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