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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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A prime number
An integer
A whole number
An irrational number
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Question # 2
∀a,b, c ε R ac = bc ⇒ a = b, c ≠ 0 is a
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Symmetric property
Cancellation property w.r.t multiplication
Reflexive property
Transitive property
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Question # 3
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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 # 4
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Question # 5
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 # 6
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N
r
2r
π
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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
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Question # 9
Multiplicative inverse of 0 is
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0
1
±1
Does not exist
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Question # 10
The decimal fraction in which we have finite number of digits in its decimal part is called.
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recurring decimal fraction
Non terminating faction
Non recurring fraction
terminating decimal fraction
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Question # 11
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are real no
both are not real
are imaginary no
both are imaginary
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Question # 12
Which element is the additive inverse of (a,b) in Complex numbers
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(a,0)
(0,b)
(a,b)
(-a,-b)
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Question # 13
Name the property used in 4 x (5 x 8) = ( 4 x 5) x 8
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Associative property of addition
Associative property of multiplication
Additive identity
Multiplicative identity
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Question # 14
The symbol of irrational is
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W
N
Q
Q
'
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Question # 15
i
3
=
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-1
i
-i
1
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Question # 16
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A complex number
A rational number
A natural number
An irrational number
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Question # 17
In polar form of complex number r =
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Question # 18
Additive inverse of - a - b is
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a
-a + b
a - b
a + b
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Question # 19
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 # 20
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 # 21
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 # 22
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 # 23
In R the number of identity element w.r.t '+' is
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One
Two
Three
Four
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Question # 24
The set of rationals numbers between 0 and I is
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Finite
Null set
Infinite
None of these
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Question # 25
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A natural number
A rational number
An irrational number
A whole number
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Question # 26
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Associative law of addition
Commutative law of addition
Additive identity
Closure law of addition
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Question # 27
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Question # 28
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Question # 29
The product of complex numbers (a,b) and (c,d) is
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(ac, bd)
(ac-bd, ad+bc)
(ab,cd)
(ac+bd,ad-bc)
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Question # 30
i =
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Question # 31
The solution set of the equation |3x + 2| = 5 is
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