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ECAT Pre General Science Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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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 # 2
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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Question # 3
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 # 4
If P is a whole number greater than 1, which has only P and I are factors. Then P is called
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Wholw number
Prime number
Even number
Odd number
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Question # 5
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Rational
Irrational
Even
Odd
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Question # 6
Associative law of multiplication
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ab = ba
a(bc) = (ab) c
a(b+c) = ab + ac
(a + b)c = ac + bc
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Question # 7
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15
15 i
-15 i
-15
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Question # 8
If in a set of real no a is additive identity then
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a+a = 2a
a+a = 1
a+a = 0
None of these
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Question # 9
(a,0) x (c, 0) =
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(0,ac)
(ac, 0)
(0,0)
(a, c)
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Question # 10
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Question # 11
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 # 12
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(x, y)
(kx, y)
(x, ky)
(kx, ky)
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Question # 13
The multiplicative inverse of (a,b) is
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Question # 14
√25 is a number
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Rational
Irrational
Natural
Odd
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Question # 15
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15
15 i
-15 i
-15
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Question # 16
√2 is a number
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Rational
Irrational
Even
Odd
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Question # 17
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1
-i
i
0
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Question # 18
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Question # 19
For each real number, there is a number which is its
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Negative
Possitive
Opposite
Similar
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Question # 20
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Question # 21
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Commutative property of addition
Closure property of addition
Additive inverse
Associative property w.r.t. to addition
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Question # 22
Every natural number is
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A prime number
An irrational number
An integer
An even number
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Question # 23
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 # 24
The additive inverse of 2/3 is
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3/2
-2/3
-3/2
0
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Question # 25
2.333....is a
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Irrational no
Complex no
Rational no
None of these
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Question # 26
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 # 27
i
2
=
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1
2
-1
0
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Question # 28
(7, 9) + (3, -5) =
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(4, 4)
(10, 4)
(9, -5)
(7, 3)
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Question # 29
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z is purely imaginary
a is any complex number
z is real
None of these
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Question # 30
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-3 -2i
3 +2i
1 + 2i
1 - 2i
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