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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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Additive property of inequality
Commutative property
Additive inverse
Additive identity
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Question # 3
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 # 4
√23 is
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A rational number
A irrational number
An even integer
A factor of 36
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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
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Question # 7
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Question # 8
The negative square root of 9 can be written as:
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-√9
√9
√18
-√18
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Question # 9
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(x, y)
(kx, y)
(x, ky)
(kx, ky)
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Question # 10
What is the conjugate of -7 -2i ?
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-7 + 2i
7 +2i
7 -2i
√53
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Question # 11
If Z
1
= 1 + i, Z
2
= 2+3i, then |Z
1
- Z
2
| = ?
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Question # 12
6 is
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A prime integar
An irrational number
A rational number
An odd integer
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Question # 13
I is not
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Real number
Natural number
Prime Number
Whole Number
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Question # 14
The equation |x +4| = x has solution
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x = -2
x = 2
x = -4
x = 4
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Question # 15
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Associative law of addition
Commutative law of addition
Additive identity
Closure law of addition
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Question # 16
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Question # 17
i
3
=
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-1
i
-i
1
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Question # 18
√x = ______ if is a prime number
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Rational no
Natural no
Irrational no
Complex no
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Question # 19
i
2
=
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1
2
-1
0
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Question # 20
i =
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Question # 21
The set of natural no. is closed under
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multiplication
subtraction
difference
division
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Question # 22
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Associative property of addition
Associative property of multiplication
Commutative property of addition
Commutative property of multiplication
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Question # 23
The multiplicative inverse ofx^(-1) is
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x
a-2
0
1
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Question # 24
Every irrational number is
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A real number
A prime number
A natural number
An integer
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Question # 25
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 # 26
√(-1b) =?
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b i
-i b
b2
i√b
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Question # 27
0.25 is ______
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An irrational number
A natural number
A prime number
A rational number
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Question # 28
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Principle of equality of fractions
Rule for product of fraction
Rule for quotient of fraction
Golden rule of fractions
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Question # 29
(a,0) x (c,0) =
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(0,ac)
(ac,0)
(0,0)
(a,c)
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Question # 30
∀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 # 31
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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