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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers
Question # 1
Choose an answer
A rational number
A irrational number
An even integer
A factor of 36
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Question # 2
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 # 3
The real number system contains.
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Positive Numbers
Negative numbers
Zero
(option a, b and c)
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Question # 4
2.333....is a
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Irrational no
Complex no
Rational no
None of these
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Question # 5
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Question # 6
The√ is used for the
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Positive square root
Negative square root
+ve and -ve square root
Whole number
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Question # 7
What is the conjugate of -6 -i?
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-6 +i
6+i
-6 -i
6 -i
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Question # 8
The additive inverse of 2/3 is
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3/2
-2/3
-3/2
0
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Question # 9
∀ z ∈ C, multipliucative is
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(1,1)
(1,0)
(0,1)
None of these
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Question # 10
O is ______
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A positive integer
A negative integer
A natural number
An integer
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Question # 11
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Question # 12
If 0 = R, thenthe additive inverse of a is
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1/9
1/-9
a
-a
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Question # 13
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 # 14
Which of the following has the same value as i
113
?
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i
-1
-i
1
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Question # 15
What is the conjugate of -6 -i
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-6 +i
6 + i
-6 -i
6 -i
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Question # 16
The multiplicative inverse of 0 is
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1
-1
0
Does not exist
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Question # 17
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 # 18
The symbol of irrational is
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W
N
Q
Q
'
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Question # 19
What is the conjugate of -7 -2i ?
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-7 + 2i
7 +2i
7 -2i
√53
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Question # 20
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 # 21
Every real number is
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a positive integer
a rational number
a negative integer
a complex number
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Question # 22
Every prime number is also
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Rational number
Even number
Irrational number
Multiple of two numbers
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Question # 23
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Question # 24
In R the number of identity element w.r.t '+' is
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One
Two
Three
Four
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Question # 25
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None of these
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Question # 26
2/9,5/7∈ R,(2│9)(5│7)=10/63∈R this property is called
Choose an answer
Associative property
Identity property
Commutative property
Closure property w.r.t multiplication
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Question # 27
Name the property used in 4 x (5 x 8) = ( 4 x 5) x 8
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Associative property of addition
Associative property of multiplication
Additive identity
Multiplicative identity
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Question # 28
(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 # 29
Name the property used in 1000 x 1 = 1000
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additive inverse
multiplicative inverse
additive identity
multiplicative identity
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Question # 30
The multiplicative inverse ofx^(-1) is
Choose an answer
x
a-2
0
1
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Question # 31
The multiplicative inverse of 1 is
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1
-1
0
Does not exist
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