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ECAT Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
The square root of every incomplete square is an
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Rational numbers
Even numbers
odd numbers
Irrational numbers
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Question # 2
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Question # 3
What is the conjugate of -7 -2i?
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-7 + 2i
7 + 2i
7 -2i
None of these
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Question # 4
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Question # 5
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Question # 6
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Question # 7
The additive identity of real number is
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1
2
1/2
0
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Question # 8
Every prime number is also
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Rational number
Even number
Irrational number
Multiple of two numbers
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Question # 9
Union of the sets of rational and irrational numbers is called 6th set of
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Natural numbers
Real numbers
Whole numbers
Prime numbers
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Question # 10
The negative square root of 9 can be written as:
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-√9
√9
√18
-√18
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Question # 11
What is the conjugate of -7 -2i ?
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-7 + 2i
7 +2i
7 -2i
√53
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Question # 12
The property used in -3 <-2 ⇒0 <1
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Commutative property
Additive property of inequality
Additive inverse
Additive identity
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Question # 13
(a
-1
)
-1
=
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a
-1
a
-a
None of above
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Question # 14
In R the left cancellation property w.r.t addition is
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Question # 15
The additive inverse of 1 is
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1
-1
0
Does not exist
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Question # 16
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Question # 17
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1
-1
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Question # 18
∀ 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 # 19
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 # 20
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 # 21
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1
-1
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Question # 22
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Question # 23
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 # 24
∀a,b,c∈R and c>0,then
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a>b ⇒ ac < bc
a>b ⇒ ac > bc
a<b ⇒ ac > bc
None of these
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Question # 25
The multiplicative inverse ofx^(-1) is
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x
a-2
0
1
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Question # 26
O is ______
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A positive integer
A negative integer
A natural number
An integer
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Question # 27
The equation |x +4| = x has solution
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x = -2
x = 2
x = -4
x = 4
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Question # 28
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Question # 29
Decimal part of irrational number is
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Terminating
Repeating only
Neither repeating nor terminating
Repeating and terminating
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Question # 30
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Trichotomy property
Additive property of inequality
Transitive property
Multiplicative property
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Question # 31
QUQ'
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