ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

The multiplicative inverse of 2/3 is

• 3/2 A
• -2/3 B
• -3/2 C
• 1 D

• Rational A
• Irrational B
• Natural C
• Odd D

• Associate law of addition A
• Commutative law of addition B
• Additive identity C
• Closure law of addition D

a.a^-1= a^-1.a = 1 is a

• Commutative law of multiplication A
• Multiplication identity B
• Associative law of multiplication C
• Multiplication inverse D

Every prime number is also

• Rational number A
• Even number B
• Irrational number C
• Multiple of two numbers D

The identity element with respect to subtraction is

• 0 A
• 1 B
• -1 C
• Does not exist D

• Associative law of addition A
• Commutative law of addition B
• Additive identity C
• Closure law of addition D

• A positive integer A
• A negative integer B
• A natural number C
• An irrational number D

A subset of set of complex number whose elements are of the form (a,0) is called

• Real number A
• Complex number B
• Rational number C
• Irrational number D

The order axioms are satisfied by set of

• C A
• C and R B
• R C
• None of these D

If a > b or a < b than a = b is a

• Additive property A
• Transitive property B
• Trichotomy property of inequality C

∀x,y∈R and x> 0 , y>0, if x > y

• 
  A
• 
  B
• 
  C
• None of these D

• Associative property of addition A
• Commutative property of addition B
• Distributive property C
• Additive identity D

I is not

• Real number A
• Natural number B
• Prime Number C
• Whole Number D

Q∪ Q' =

• Q A
• Q' B
• N C
• R D

∀x, y ∈ R, either x = y or x > y or x < y is

• Transitive property A
• Reflexive property B
• Trichotomy property C
• None of these D

The additive inverse of 0 is

• 1 A
• -1 B
• 0 C
• Does not exist D

• 
  A
• 
  B
• 
  C
• 
  D

√-1 b=

• b A
• 2 B
• 2b C
• None of these D

Every irrational number is

• A real number A
• A prime number B
• A natural number C
• An integer D

• 1 A
• 3 B
• 2-i C
• -1 D

√2 +√3 +√5) = (√2 +√3 +√5: this property is called

• associative property w.r.t addition A
• commutative property B
• Closure property w.r.t addition C
• Additive identity D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D
• 
  E

• additive property A
• multiplicative property B
• additive inverse C
• additive identity D

i² =

• 1 A
• 2 B
• -1 C
• 0 D

If a set S contains n elements then P (S) has ........ number of elements

• 2ⁿ A
• 2ⁿ² B
• 2.n C
• n² D

Name the property used in 4 x (5 x 8) = ( 4 x 5) x 8

• Associative property of addition A
• Associative property of multiplication B
• Additive identity C
• Multiplicative identity D

• 
  A
• 1 B
• 
  C
• -1 D

• a = a A
• a < a B
• a > a C
• a²= a D