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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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Closure law of addition
Associative law of addition
Additive inverse
Additive identity
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Question # 2
The order axioms are satisfied by set of
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C
C and R
R
None of these
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Question # 3
i
=
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√1
√2
√-2
√-1
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Question # 4
1/3 is a decimal
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Recurring
Terminating
Non-terminating
None of the above
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Question # 5
Name the property used in 100 + 0 = 100
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Additive inverse
Multiplicative inverse
Additive identity
Multiplicative identity
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Question # 6
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1
-1
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Question # 7
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 # 8
2.333....is a
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Irrational no
Complex no
Rational no
None of these
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Question # 9
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Question # 10
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Question # 11
The set of positive integers, 0 and negative integers is known as the set of
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Natural numbers
Rational numbers
All integers
Irrational numbers
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Question # 12
The set { 1 , -1} is closed w.r.t.
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Addition
Multiplications
Subtraction
None of these
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Question # 13
What is the conjugate of -7 -2i ?
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-7 + 2i
7 +2i
7 -2i
√53
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Question # 14
What is the conjugate of -7 -2i?
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-7 + 2i
7 + 2i
7 -2i
None of these
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Question # 15
If Z = (1,2), then Z
-1
=?
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(0.2, 0.4)
(-0.2 ,0.4)
(0.2,-0.4)
(-0.2,-0.4)
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Question # 16
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-3 -2i
3 +2i
1 + 2i
1 - 2i
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Question # 17
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 # 18
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Question # 19
In R, the additive inverse of a is
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0
1
-a
1/a
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Question # 20
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Question # 21
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 # 22
√2 is a number
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Rational
Irrational
Even
Odd
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Question # 23
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Principle of equality of Fractions
Rule for product of fraction
Golden rule of fraction
Rule of quotient of Fraction
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Question # 24
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Symmetric property
Cancellation property w.r.t. multiplication
Reflexive property
Transitive property
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Question # 25
a.a
-1
= a
-1
.a = 1 is a
Choose an answer
Commutative law of multiplication
Multiplicative identity
Associative law of multiplication
Multiplicative inverse
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Question # 26
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 # 27
4/√49 is a
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Irrational Number
Prime Number
Rational number
Whole number
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Question # 28
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Question # 29
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Question # 30
The set {1, 2, 3, 4, ....} is called
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Set of Natural numbers
Set of whole numbers
Set of rational number
Set of irrational numbers
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Question # 31
The negative square root of 9 can be written as:
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-√9
√9
√18
-√18
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