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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers
Question # 1
If
∀a,b ε R,then a +b ε R is a property
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Closure law of addition
Associative law of addition
Additive inverse
Additive identity
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Question # 2
For any real numbers x,y,xy=o ⇒
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x ≠ 0 ∧ y ≠ 0
x = 0 ∨ y = 0
x = 0
y = 0
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Question # 3
The set {0,-1} hold closure property under
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Addition
Both a & c
Multiplication
None of these
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Question # 4
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A rational number
A natural number
An irrational number
An integer
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Question # 5
The multiplicative inverse of 2/3 is
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3/2
-2/3
-3/2
1
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Question # 6
It is not possible to find the exact value of
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π
√9
∛27
√1
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Question # 7
(7, 9) + (3, -5) =
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(4, 4)
(10, 4)
(9, -5)
(7, 3)
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Question # 8
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a = a
a < a
a > a
a
2
= a
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Question # 9
A non-terminating, non-recurring decimal represent
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A natural number
A rational number
An irrational number
A prime number
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Question # 10
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Rational
Irrational
Even
Odd
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Question # 11
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 # 12
If a and b are real numbers then a+b is also real number this law is called
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associative law of addition
closure law of addition
Distributive law of addition
Commutative law of addition
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Question # 13
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Question # 14
In (x + iy) x is the known as
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Imaginary part of complex number
Real part of complex number
Complex number
None of above
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Question # 15
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Question # 16
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Associative property of addition
Commutative property of addition
Distributive property
Additive identity
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Question # 17
QUQ, =
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N
R
W
Z
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Question # 18
3/4 is ______
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An odd number
An even number
A natural number
A rational number
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Question # 19
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x
y
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Question # 20
There is no element common in
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N and W
E and W
N and O
Q and Q'
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Question # 21
If in a set of real no a is additive identity then
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a+a = 2a
a+a = 1
a+a = 0
None of these
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Question # 22
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Question # 23
∀ z ∈ C, multipliucative is
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(1,1)
(1,0)
(0,1)
None of these
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Question # 24
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Question # 25
The order axioms are satisfied by set of
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C
C and R
R
None of these
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Question # 26
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Question # 27
If a set S contains n elements then P (S) has ........ number of elements
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2
n
2
n2
2.n
n
2
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Question # 28
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 # 29
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Symmetric property
Cancellation property w.r.t. multiplication
Reflexive property
Transitive property
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Question # 30
i =
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Question # 31
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z is purely imaginary
a is any complex number
z is real
None of these
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