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ECAT Pre General Science Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
a >b ⇒a +c >b +c is known as
Choose an answer
Trichotomy property
Additive property of inequality
Transitive property
Multiplicative property
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Question # 2
If z
1
= 1 + 2i, z
2
= 3 + 4i then
Choose an answer
z
1
> z
2
z
1
= z
2
z
1
< z
2
None of these
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Question # 3
In R the right cancellation property w.r.t. addition is
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Question # 4
Every irrational number is
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A real number
A prime number
A natural number
An integer
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Question # 5
A prime number can be a factor of a square only if it occurs in the square at least
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Once
Thirce
Twice
None of these
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Question # 6
The additive inverse of 1 is
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1
-1
0
Does not exist
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Question # 7
∀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 # 8
Choose an answer
1
-i
i
0
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Question # 9
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Question # 10
If Z = (1,2), then Z
-1
=?
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(0.2, 0.4)
(-0.2 ,0.4)
(0.2,-0.4)
(-0.2,-0.4)
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Question # 11
Choose an answer
(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 # 12
The real number system contains.
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Positive Numbers
Negative numbers
Zero
(option a, b and c)
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Question # 13
√2 is a number
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Rational
Irrational
Even
Odd
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Question # 14
The additive identity of real number is
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1
2
1/2
0
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Question # 15
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Principle of equality of Fractions
Rule for product of fraction
Golden rule of fraction
Rule of quotient of Fraction
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Question # 16
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 # 17
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 # 18
∀ z ∈ C, multipliucative is
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(1,1)
(1,0)
(0,1)
None of these
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Question # 19
The multiplicative inverse ofx^(-1) is
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x
a-2
0
1
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Question # 20
The additive inverse of 0 is
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1
-1
0
Does not exist
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Question # 21
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Question # 22
∀x,y,z ∈ R and z 0,then
Choose an answer
x > y ⇒ xz > yz
x<y ⇒ xz < yz
x < y ⇒ xz > yz
None of these
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Question # 23
What is the conjugate of -6 -i?
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-6 +i
6+i
-6 -i
6 -i
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Question # 24
Choose an answer
Symmetric property
Cancellation property w.r.t. multiplication
Reflexive property
Transitive property
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Question # 25
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 # 26
Choose an answer
1
-1
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Question # 27
The negative square root of 9 can be written as:
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-√9
√9
√18
-√18
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Question # 28
The multiplicative inverse of -3i is
Choose an answer
3i
-3i
-1/3i
1/3 i
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Question # 29
Choose an answer
Commutative law of addition
Associative law of addition
Additive identity
Additive inverse
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Question # 30
What is the conjugate of -7 -2i?
Choose an answer
-7 + 2i
7 + 2i
7 -2i
None of these
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Question # 31
The multiplicative inverse of (a,b) is
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