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ECAT Pre General Science Mathematics Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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Reflexive property
Symmetric property
Transitive property
Additive property
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Question # 2
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-8
8
8i
32
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Question # 3
24 can be written as a product of
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Odd factors
Even factors
Whole factors
Prime factors
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Question # 4
If z
1
=√-36 ,z
2
=√-25,z3 =√-16 then
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15
15i
-15i
-15
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Question # 5
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Multiplication property
Additive property
Trichotomy property
Transitive property of inequality
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Question # 6
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 # 7
If a set S contains n elements then P (S) has ........ number of elements
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2
n
2
n2
2.n
n
2
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Question # 8
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Question # 9
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Question # 10
i
is equal
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(1 , 0)
(0 , 1)
(1 , 1)
(0 , 0)
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Question # 11
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Question # 12
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Rational
Irrational
Even
Odd
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Question # 13
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1
3
2-i
-1
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Question # 14
The multiplicative inverse of 0 is
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1
-1
0
Does not exist
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Question # 15
QUQ, =
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N
R
W
Z
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Question # 16
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 # 17
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 # 18
(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 # 19
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 # 20
Some of two real numbers is also a real number , this property is called:
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Commutative property w.r.t addition
Closure property w.r.t. addition
Associative property w.r.t. addition
Distributive property w.r.t addition
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Question # 21
Which of the following has the same value as i
113
?
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i
-1
-i
1
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Question # 22
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Associative property of addition
Associative property of multiplication
Commutative property of addition
Commutative property of multiplication
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Question # 23
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Question # 24
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Closure law of addition
Closure law of multiplication
Commutative law of addition
Commutative law of multiplication
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Question # 25
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Reflexive property
Symmetric property
Cancellations property w.r.t. addition
Transitive property
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Question # 26
In set builder notation the set {0,1,2,........100} can be written as
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{x / xε B ∧ x ≤ 100}
{x / x ∈ W ∧ x < 101}
{x / x ∈ Z ∧ x < 101}
The set of first 100 whole numbers
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Question # 27
The multiplicative inverse of -3i is
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3i
-3i
-1/3i
1/3 i
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Question # 28
1.4142135... is ______
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A natural number
A rational number
A prime number
An irrational number
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Question # 29
(a+bi) - (c+di)=
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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 # 30
Gooch crucible is made of :
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Brass.
Porcelain.
Bronze.
Gold.
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Question # 31
6 is
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A prime integer
An irrational number
A rational number
An odd integer
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