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ECAT Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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 # 2
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Reflexive property
Symmetric property
Transitive property
Additive property
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Question # 3
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Question # 4
∀x,y∈ R and x < 0, y < 0, which one is true
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xy < o
xy = o
xy > o
None of these
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Question # 5
The conjugate of √5
i
is
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√5
-√5 i
i
5i
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Question # 6
What is the conjugate of -6 -i?
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-6 +i
6+i
-6 -i
6 -i
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Question # 7
In R the right cancellation property w.r.t. addition is
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Question # 8
If z
1
= 2 + 6i and z
2
= 3 + 7i, then which expression defines the product of z
1
and z
2
?
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36 + (-32)i
-36 + 32i
6 + (-11)1
0, +(-12)i
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Question # 9
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Question # 10
3.5+5.4=5.4+3.5 =8.9 this property of addition is called
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additive identity
assoclative property
commulative property
closure property
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Question # 11
Name the property used in 4.1 + (-4.1) = 0
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Additive inverse
Multiplication inverse
Additive identity
Multiplication identity
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Question # 12
The square roots of negative numbers is called
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Real no
Complex no
Positive no
Negative no
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Question # 13
The multiplicative inverse of 0 is
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1
-1
0
Does not exist
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Question # 14
The multiplicative inverse ofx^(-1) is
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x
a-2
0
1
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Question # 15
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Question # 16
A non-terminating, non-recurring decimal represent
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A natural number
A rational number
An irrational number
A prime number
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Question # 17
Decimal part of irrational number is
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Terminating
Repeating only
Neither repeating nor terminating
Repeating and terminating
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Question # 18
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0
1
-1
2
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Question # 19
Any recurring decimal represents a
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Irrational no
Integer
Rational no
None of these
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Question # 20
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 # 21
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are real no
both are not real
are imaginary no
both are imaginary
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Question # 22
If z = (x,y) , then z ̅ =
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(-x,y)
(x,-y)
(-x, -y)
None of these
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Question # 23
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 # 24
Multiplicative inverse of "1" is
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0
±1
1
{0,1}
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Question # 25
Additive inverse of - a - b is
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a
-a + b
a - b
a + b
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Question # 26
QUQ, =
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N
R
W
Z
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Question # 27
Every real number is
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A complex number
A rational number
A natural number
A prime number
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Question # 28
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real part of z
imaginary part of z
conjugate of z
modulus of z
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Question # 29
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1
3
2-i
-1
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Question # 30
The multiplicative inverse of (a,b) is
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Question # 31
If Z
1
= 1 + i, Z
2
= 2+3i, then |Z
1
- Z
2
| = ?
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