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ECAT Pre General Science Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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N
r
2r
π
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Question # 2
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Question # 3
What is the conjugate of -6 -i?
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-6 +i
6+i
-6 -i
6 -i
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Question # 4
(a+bi) - (c+di)=
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(a+b) = (c+d)
(a+c) + i(b+d)
(a - c) + (c- d)i
(a - c)+ (b - d)i
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Question # 5
1.4142135... is ______
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A natural number
A rational number
A prime number
An irrational number
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Question # 6
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A natural number
A rational number
An irrational number
A whole number
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Question # 7
If 4 > b or a < b than a = b is a
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Additive property
Transitive property
Trichotomy property of inequality
None of above
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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
i
101
=
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i
i
2
-i
-1
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Question # 10
4/√49 is a
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Irrational Number
Prime Number
Rational number
Whole number
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Question # 11
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 # 12
The value of x, and y, when (x + iy)
2
= 5 + 4i
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X = 2, y = 1
X = -2, y = 1
X = 2, y = -1
X = 2, y = 2
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Question # 13
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 # 14
The symbol of irrational is
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W
N
Q
Q'
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Question # 15
A subset of set of complex number whose elements are of the form (a,0) is called
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Real number
Complex number
Rational number
Irrational number
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Question # 16
a.a
-1
= a
-1
.a = 1 is a
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Commutative law of multiplication
Multiplicative identity
Associative law of multiplication
Multiplicative inverse
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Question # 17
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Question # 18
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Question # 19
A non-terminating non_recurring decimal represents an
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Irrational no
Both a & c
Rational no
None of these
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Question # 20
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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 # 21
√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 # 22
In R, the additive identity is
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0
1
-1
None
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Question # 23
(a +b
i
) -c (c +d
i
) =
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(a +b) = (c +d)
(a +c) + i(b +d)
(a -c) + (c -d)
i
(a -c) +(b -d)
i
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Question # 24
3/2 is
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An irrational number
Whole number
A positive integer
A rational number
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Question # 25
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Question # 26
i
101
=
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i
i
2
-i
-1
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Question # 27
6 is
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A prime integer
An irrational number
A rational number
An odd integer
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Question # 28
If z
1
=√-36 ,z
2
=√-25,z3 =√-16 then
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15
15i
-15i
-15
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Question # 29
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 # 30
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 # 31
∀x, y ∈ R, either x = y or x > y or x < y is
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Transitive property
Reflexive property
Trichotomy property
None of these
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