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ECAT Pre General Science Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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Question # 2
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Commutative law of addition
Associative law of addition
Additive identity
Additive inverse
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Question # 3
Additive inverse of - a - b is
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a
-a + b
a - b
a + b
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Question # 4
The equation |x + 4| = x has solution
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x = -2
x = 2
x = -4
x = 4
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Question # 5
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A rational number
A irrational number
An even integer
A factor of 36
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Question # 6
∀a,b ε R, ab = be is a
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Commutative law of multiplication
Closure law of multiplication
Associative law of multiplication
Multiplicative identity
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Question # 7
The multiplicative inverse of 1 is
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1
-1
0
Does not exist
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Question # 8
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 # 9
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Question # 10
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 # 11
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Closure law of addition
Associative law of addition
Commutative law of multiplication
Associative law of multiplication
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Question # 12
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Closure law of addition
Closure law of multiplication
Commutative law of addition
Commutative law of multiplication
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Question # 13
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0
1
-1
2
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Question # 14
Q∪ Q' =
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Q
Q'
N
R
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Question # 15
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Rule of quotient of fraction
Golden rule of fraction
Rule for product of fraction
Principle for equality of fraction
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Question # 16
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 # 17
∀x,y∈R and x> 0 , y>0, if x > y
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None of these
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Question # 18
√(-1b) =?
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b i
-i b
b2
i√b
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Question # 19
∀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 # 20
The additive identity of real number is
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1
2
1/2
0
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Question # 21
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Question # 22
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 # 23
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Question # 24
Multiplicative inverse of 0 is
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0
1
±1
Does not exist
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Question # 25
The additive inverse of 0 is
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1
-1
0
Does not exist
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Question # 26
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Question # 27
√-1 b=
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b
2
2b
None of these
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Question # 28
Which element is the additive inverse of (a,b) in Complex numbers
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(a,0)
(0,b)
(a,b)
(-a,-b)
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Question # 29
Which element is the additive inverse of (a, b) in Complex numbers?
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(a, 0)
(0, b)
(a, b)
(-a, -b)
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Question # 30
If a is any real number and a = a is called
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symmetric property
Trichotomy Properties
Transitive Property
Reflexive Properties
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Question # 31
Every irrational number is
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A real number
A prime number
A natural number
An integer
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