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ECAT Pre General Science Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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None of these
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Question # 2
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x
y
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Question # 3
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Question # 4
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Set of whole number
Rational Numbers
Complex numbers
Whole numbers
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Question # 5
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Question # 6
∀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 # 7
Zero is
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An irrational number
A rational number
A negative integer
A positive number
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Question # 8
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Question # 9
The solution set of the equation |3x + 2| = 5 is
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Question # 10
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0
1
-1
2
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Question # 11
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Question # 12
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Question # 13
In (x + iy), y is called as
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Imaginary part
Complex number
Real part
None of above
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Question # 14
The additive inverse of 1 is
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1
-1
0
Does not exist
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Question # 15
i
3
=
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-1
i
-i
1
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Question # 16
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 # 17
The multiplicative inverse of 1 - 2i is
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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
In R, the multiplicative inverse of a is
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0
1
-a
1/a
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Question # 20
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Reflexive property
Symmetric property
Cancellations property w.r.t. addition
Transitive property
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Question # 21
If 4 > b or a < b than a = b is a
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Additive property
Transitive property
Trichotomy property of inequality
None of above
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Question # 22
The multiplicative inverse of 0 is
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1
-1
0
Does not exist
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Question # 23
Every natural number is
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A prime number
An irrational number
An integer
An even number
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Question # 24
In set builder notation the set {0,1,2,........100} can be written as
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{x / xε B ∧ x ≤ 100}
{x / x ∈ W ∧ x < 101}
{x / x ∈ Z ∧ x < 101}
The set of first 100 whole numbers
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Question # 25
The set { 1 , -1} is closed w.r.t.
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Addition
Multiplications
Subtraction
None of these
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Question # 26
(a, b) + (-a, -b) =
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(0,0)
(a, b)
(-a, -b)
(1, 1)
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Question # 27
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 # 28
Additive inverse of - a - b is
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a
-a + b
a - b
a + b
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Question # 29
3/4 is ______
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An odd number
An even number
A natural number
A rational number
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Question # 30
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Question # 31
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Associative law of addition
Commutative law of addition
Additive identity
Closure law of addition
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