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ECAT Pre General Science Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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Question # 2
Every prime number is also
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Rational number
Even number
Irrational number
Multiple of two numbers
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Question # 3
if Z1 = 1+i, Z2= 2+3i, then |Z2 -Z1| =
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√3 i
√7
-2-i
√5
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Question # 4
14 is not a
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Prime number
Whole number
Even number
Real number
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Question # 5
In R, the additive inverse of a is
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0
1
-a
1/a
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Question # 6
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A complex number
A rational number
A natural number
An irrational number
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Question # 7
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 # 8
i
2
=
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1
2
-1
0
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Question # 9
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Question # 10
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 # 11
6 is
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A prime integar
An irrational number
A rational number
An odd integer
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Question # 12
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Question # 13
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a = a
a < a
a > a
a
2
= a
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Question # 14
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 # 15
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Principle of equality of fractions
Rule for product of fraction
Rule for quotient of fraction
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Question # 16
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 # 17
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Question # 18
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1
3
2-i
-1
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Question # 19
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Associative law of addition
Commutative law of addition
Additive identity
Closure law of addition
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Question # 20
If z=(x,y) then z has no multiplicative inverse when
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x ≠ 0, y = 0
x = 0, y = 0
x = 0, y ≠ 0
None of these
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Question # 21
For each real number, there is a number which is its
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Negative
Possitive
Opposite
Similar
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Question # 22
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Symmetric property
Cancellation property w.r.t. multiplication
Reflexive property
Transitive property
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Question # 23
The additive inverse of 2/3 is
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3/2
-2/3
-3/2
0
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Question # 24
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Question # 25
(a +b
i
) -c (c +d
i
) =
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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
The additive inverse of 1 is
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1
-1
0
Does not exist
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Question # 27
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 # 28
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 # 29
i
-(4n+2)
= -------------------------------
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1
i
-1
-i
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Question # 30
If a > b or a < b than a = b is a
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Additive property
Transitive property
Trichotomy property of inequality
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Question # 31
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 = -i
x = 2, y = 2
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