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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers
Question # 1
In R the left cancellation property w.r.t addition is
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Question # 2
If Z
1
= 1 + i, Z
2
= 2+3i, then |Z
2
- Z
1
| = ?
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Question # 3
Name the property used in 4 + 9 = 9 + 4
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Associative property of addition
Commutative property of addition
Distributive property
Additive identity
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Question # 4
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Question # 5
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 # 6
If 0 = R, thenthe additive inverse of a is
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1/9
1/-9
a
-a
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Question # 7
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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 # 8
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-8
8
8i
32
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Question # 9
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 # 10
2/9,5/7∈ R,(2│9)(5│7)=10/63∈R this property is called
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Associative property
Identity property
Commutative property
Closure property w.r.t multiplication
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Question # 11
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additive property
multiplicative property
additive identity
multiplicative identity
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Question # 12
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A rational number
A natural number
An irrational number
An integer
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Question # 13
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Question # 14
i
-(4n+2)
= -------------------------------
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1
i
-1
-i
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Question # 15
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Question # 16
In R, the additive inverse of a is
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0
1
-a
1/a
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Question # 17
(a
-1
)
-1
=
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a
-1
a
-a
None of above
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Question # 18
If a and b are real numbers then a+b is also real number this law is called
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associative law of addition
closure law of addition
Distributive law of addition
Commutative law of addition
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Question # 19
A prime number can be a factor of a square only if it occurs in the square at least
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Once
Thirce
Twice
None of these
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Question # 20
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Question # 21
14 is not a
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Prime number
Whole number
Even number
Real number
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Question # 22
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Question # 23
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0
1
-1
2
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Question # 24
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 # 25
If Z
1
= 1 + i, Z
2
= 2+3i, then |Z
1
- Z
2
| = ?
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Question # 26
The equation |x + 4| = x has solution
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x = -2
x = 2
x = -4
x = 4
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Question # 27
∀ a ε R ∃ o ε R such that a + v = 0 + a = a is property of
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Commutative law of addition
Associative law of addition
Additive identity
Additive inverse
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Question # 28
i
=
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√1
√2
√-2
√-1
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Question # 29
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Rule of quotient of fraction
Golden rule of fraction
Rule for product of fraction
Principle for equality of fraction
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Question # 30
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Closure law of addition
Associative law of addition
Additive inverse
Additive identity
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Question # 31
If a is any real number and a = a is called
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symmetric property
Trichotomy Properties
Transitive Property
Reflexive Properties
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