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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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 # 2
The property used in -3 <-2 ⇒0 <1
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Commutative property
Additive property of inequality
Additive inverse
Additive identity
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Question # 3
I is not
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Real number
Natural number
Prime Number
Whole Number
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Question # 4
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15
15 i
-15 i
-15
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Question # 5
In R the right cancellation property w.r.t. addition is
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Question # 6
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real part of z
imaginary part of z
conjugate of z
modulus of z
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Question # 7
Which of the following sets has closure property w.r.t. addition
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{ 0 }
{ 1 }
{ 0, -1}
{ 1, -1}
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Question # 8
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 # 9
3/2 is
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An irrational number
Whole number
A positive integer
A rational number
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Question # 10
i
=
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√1
√2
√-2
√-1
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Question # 11
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A natural number
A rational number
An irrational number
A whole number
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Question # 12
In R the number of identity elements w.r.t.'.' is
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One
Two
Three
Four
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Question # 13
Associative law of multiplication
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ab = ba
a(bc) = (ab) c
a(b+c) = ab + ac
(a + b)c = ac + bc
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Question # 14
√2 is a number
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Rational
Irrational
Even
Odd
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Question # 15
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-3 -2i
3 +2i
1 + 2i
1 - 2i
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Question # 16
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Rational
Irrational
Even
Odd
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Question # 17
In R, the additive inverse of a is
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0
1
-a
1/a
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Question # 18
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 # 19
The multiplicative inverse of 2/3 is
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3/2
-2/3
-3/2
1
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Question # 20
202.04 is an example of
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Recurring decimals
Non-recurring decimals
Terminating decimals
None of these
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Question # 21
i
2
=
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1
2
-1
0
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Question # 22
Q∪ Q' =
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Q
Q'
N
R
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Question # 23
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Associative law of addition
Commutative law of addition
Additive identity
Closure law of addition
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Question # 24
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Question # 25
(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 # 26
∀a,b,c∈R, a >b ∧ b>c ⇒ a >c is
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Trichotomy property
Transitive property
Symmetric property
Additive property
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Question # 27
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 # 28
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 # 29
The set of rational number is represented by
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W
R
Q'
Q
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Question # 30
a >b ⇒a +c >b +c is known as
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Trichotomy property
Additive property of inequality
Transitive property
Multiplicative property
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Question # 31
Such fraction which can not be written in the form ofp⁄q where p,q and q≠ 0,such fractions are called.
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Fractinal numbers
Rational Numbers
Even Numbers
Whole Numbers
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