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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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Question # 2
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15
15 i
-15 i
-15
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Question # 3
Total number of subsets that can be formed out of the set {a,b,c} is
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1
4
8
12
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Question # 4
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real part of z
imaginary part of z
conjugate of z
modulus of z
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Question # 5
Q∪ Q' =
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Q
Q'
N
R
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Question # 6
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 # 7
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Question # 8
√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 # 9
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Question # 10
The square root of every incomplete square is an
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Rational numbers
Even numbers
odd numbers
Irrational numbers
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Question # 11
Name the property used in 4 x (5 x 8) = ( 4 x 5) x 8
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Associative property of addition
Associative property of multiplication
Additive identity
Multiplicative identity
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Question # 12
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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 # 13
i
101
=
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i
i
2
-i
-1
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Question # 14
∀a,b, c ε R ac = bc ⇒ a = b, c ≠ 0 is a
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Symmetric property
Cancellation property w.r.t multiplication
Reflexive property
Transitive property
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Question # 15
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additive property
multiplicative property
additive identity
multiplicative identity
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Question # 16
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Question # 17
i
-(4n+2)
= -------------------------------
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1
i
-1
-i
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Question # 18
The multiplicative inverse of 4 is
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-4
-1/4
1/4
1
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Question # 19
If Z
1
= 1 + i, Z
2
= 2+3i, then |Z
2
- Z
1
| = ?
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Question # 20
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 # 21
Every recurring decimal represents
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A natural number
A rational number
An irrational number
A whole number
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Question # 22
(a,b) +(-a,-b) =
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(0,0)
(a,b)
(-a,-b)
(1,1)
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Question # 23
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 # 24
In R, the multiplicative identity is
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0
1
-1
None
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Question # 25
What is the conjugate of -7 -2i ?
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-7 + 2i
7 +2i
7 -2i
√53
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Question # 26
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1
-1
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Question # 27
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Associative law of multiplication
Commutative law of addition
Commutative law of multiplication
Associative law of addition
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Question # 28
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 # 29
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Question # 30
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Associative law of addition
Commutative law of addition
Additive identity
Closure law of addition
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