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Mathematics ECAT Pre Engineering Chapter 1 Number System Online Test MCQs With Answers
Question # 1
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Question # 2
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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 # 3
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are real no
both are not real
are imaginary no
both are imaginary
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Question # 4
(a,0) x (c, 0) =
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(0,ac)
(ac, 0)
(0,0)
(a, c)
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Question # 5
The multiplicative inverse of -3i is
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3i
-3i
-1/3i
1/3 i
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Question # 6
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 # 7
14 is not a
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Prime number
Whole number
Even number
Real number
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Question # 8
i
2
=
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1
2
-1
0
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Question # 9
1/3 is a decimal
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Recurring
Terminating
Non-terminating
None of the above
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Question # 10
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Question # 11
(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 # 12
The multiplicative inverse of 2/3 is
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3/2
-2/3
-3/2
1
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Question # 13
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 # 14
The sum of complex number (a,b) and (c,d) is
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Question # 15
√25 is a number
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Rational
Irrational
Natural
Odd
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Question # 16
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 # 17
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Question # 18
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1
-1
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Question # 19
i
3
=
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-1
i
-i
1
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Question # 20
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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
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 # 23
In (x + iy), y is called as
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Imaginary part
Complex number
Real part
None of above
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Question # 24
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-3 -2i
3 +2i
1 + 2i
1 - 2i
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Question # 25
∀a,b ε R, ab = be is a
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Commutative law of multiplication
Closure law of multiplication
Associative law of multiplication
Multiplicative identity
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Question # 26
a >b ⇒a +c >b +c is known as
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Trichotomy property
Additive property of inequality
Transitive property
Multiplicative property
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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
In R, the multiplicative inverse of a is
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0
1
-a
1/a
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Question # 29
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 # 30
(√3+√5)+√7 = √3 +(√5 +√7) property used in above is
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Commutative property of addition
Closure property of addition
Additive inverse
Associative property w.r.t to adition
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Question # 31
Which of the following sets has closure property w.r.t. addition
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{ 0 }
{ 1 }
{ 0, -1}
{ 1, -1}
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