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ECAT Pre General Science Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
∀ a ε R ∃ o ε R such that a + v = 0 + a = a is property of
Choose an answer
Commutative law of addition
Associative law of addition
Additive identity
Additive inverse
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Question # 2
Rational number is a number which can be written as a terminating decimal fraction or a
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Non-terminating decimal fraction
Non-recurring
Recurring decimal fraction
a, b and c
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Question # 3
2.333....is a
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Irrational no
Complex no
Rational no
None of these
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Question # 4
In R, the additive identity is
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0
1
-1
None
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Question # 5
The decimal fraction in which we have finite number of digits in its decimal part is called.
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recurring decimal fraction
Non terminating faction
Non recurring fraction
terminating decimal fraction
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Question # 6
Multiplicative inverse of "1" is
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0
±1
1
{0,1}
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Question # 7
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 # 8
What is the conjugate of -6 -i
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-6 +i
6 + i
-6 -i
6 -i
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Question # 9
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 # 10
If z
1
= (a,b), z
2
=(c,d), then z
1
z
2
= -------------------
Choose an answer
(ac,bd)
(ac+bd, ad-bc)
(ac-bd , ad+bc)
(ac-bd , ad-bc)
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Question # 11
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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 # 12
Name the property used in 4 + 9 = 9 + 4
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Associative property of addition
Commutative property of addition
Distributive property
Additive identity
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Question # 13
∀a,b, c ε R,a +c = b + c = > a = b
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Reflexive property
Symmetric property
Cancellations property w.r.t. addition
Transitive property
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Question # 14
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 # 15
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A rational number
An irrational number
An odd number
A prime number
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Question # 16
In polar form of complex number r =
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Question # 17
(7, 9) + (3, -5) =
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(4, 4)
(10, 4)
(9, -5)
(7, 3)
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Question # 18
π is the ration of
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Area of a circle to its diameter
Area of a circle to its radius
Circumference of a circle to its diameter
Circumference of circle to its radius
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Question # 19
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-3 -2i
3 +2i
1 + 2i
1 - 2i
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Question # 20
6 is
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A prime integar
An irrational number
A rational number
An odd integer
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Question # 21
i
2
=
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1
2
-1
0
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Question # 22
(a +b
i
) -c (c +d
i
) =
Choose an answer
(a +b) = (c +d)
(a +c) + i(b +d)
(a -c) + (c -d)
i
(a -c) +(b -d)
i
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Question # 23
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Question # 24
If z = (x,y) , then z ̅ =
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(-x,y)
(x,-y)
(-x, -y)
None of these
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Question # 25
Gooch crucible is made of :
Choose an answer
Brass.
Porcelain.
Bronze.
Gold.
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Question # 26
Choose an answer
Principle of equality of fractions
Rule for product of fractions
Golden rule for fractions
Rule for quotient of fractions
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Question # 27
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 # 28
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Question # 29
Any recurring decimal represents a
Choose an answer
Irrational no
Integer
Rational no
None of these
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Question # 30
Choose an answer
A rational number
A irrational number
An even integer
A factor of 36
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