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ECAT Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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Principle of equality of fractions
Rule for product of fractions
Golden rule for fractions
Rule for quotient of fractions
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Question # 2
√2 +√3 +√5) = (√2 +√3 +√5: this property is called
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associative property w.r.t addition
commutative property
Closure property w.r.t addition
Additive identity
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Question # 3
The equation |x +4| = x has solution
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x = -2
x = 2
x = -4
x = 4
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Question # 4
The square root of 2i - 20i is
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+-(5 - 2i)
+-(5 + 2i)
(5 - 2i)
None of these
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Question # 5
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 # 6
In R, the additive inverse of a is
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0
1
-a
1/a
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Question # 7
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Question # 8
What is the conjugate of -7 -2i?
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-7 + 2i
7 + 2i
7 -2i
None of these
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Question # 9
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Question # 10
The set of rational number is represented by
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W
R
Q'
Q
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Question # 11
If P is a whole number greater than 1, which has only P and I are factors. Then P is called
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Wholw number
Prime number
Even number
Odd number
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Question # 12
(a,0) x (c,0) =
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(0,ac)
(ac,0)
(0,0)
(a,c)
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Question # 13
∀x,y,z ∈ R and z 0,then
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x > y ⇒ xz > yz
x<y ⇒ xz < yz
x < y ⇒ xz > yz
None of these
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Question # 14
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Question # 15
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Question # 16
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 # 17
If z
1
= 1 + 2i, z
2
= 3 + 4i then
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z
1
> z
2
z
1
= z
2
z
1
< z
2
None of these
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Question # 18
The set of rationals numbers between 0 and I is
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Finite
Null set
Infinite
None of these
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Question # 19
1/3 is a decimal
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Recurring
Terminating
Non-terminating
None of the above
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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
3
=
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-1
i
-i
1
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Question # 22
The set { 1 , -1} is closed w.r.t.
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Addition
Multiplications
Subtraction
None of these
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Question # 23
Every prime number is also
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Rational number
Even number
Irrational number
Multiple of two numbers
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Question # 24
3/4 is ______
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An odd number
An even number
A natural number
A rational number
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Question # 25
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Commutative law of addition
Associative law of addition
Additive identity
Additive inverse
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Question # 26
If z
1
= (a,b), z
2
=(c,d), then z
1
z
2
= -------------------
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(ac,bd)
(ac+bd, ad-bc)
(ac-bd , ad+bc)
(ac-bd , ad-bc)
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Question # 27
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 # 28
In R, the additive identity is
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0
1
-1
None
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Question # 29
The identity element with respect to subtraction is
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0
-1
0 and 1
None of thes
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Question # 30
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