ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

In R the number of identity element w.r.t '+' is

• One A
• Two B
• Three C
• Four D

• Set of whole number A
• Rational Numbers B
• Complex numbers C
• Whole numbers D

√(-1b) =?

• b i A
• -i b B
• b2 C
• i√b D

For each real number, there is a number which is its

• Negative A
• Possitive B
• Opposite C
• Similar D

• Closure law of addition A
• Closure law of multiplication B
• Commutative law of addition C
• Commutative law of multiplication D

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

• 2ⁿ A
• 2ⁿ² B
• 2.n C
• n² D

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

• 
  A
• 
  B
• 
  C
• 
  D

• Associative law of multiplication A
• Commutative law of addition B
• Commutative law of multiplication C
• Associative law of addition D

The conjugate of √5 i is

• √5 A
• -√5 i B
• i C
• 5i D

√25 is a number

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

i² =

• 1 A
• 2 B
• -1 C
• 0 D

∀x,y∈ R and x < 0, y < 0, which one is true 

• xy < o A
• xy = o B
• xy > o C
• None of these D

• 
  A
• 
  B
• 
  C
• 
  D

The multiplicative inverse of 2/3 is

• 3/2 A
• -2/3 B
• -3/2 C
• 1 D

The set {1,2,3,4......} is called

• Set of natural numbers A
• Set of whole numbers B
• Set of rational number C
• Set of irrational numbers D

• 
  A
• 
  B
• 
  C

i =

• √1 A
• √2 B
• √-2 C
• √-1 D

√23 is

• A rational number A
• A irrational number B
• An even integer C
• A factor of 36 D

i³ =

• -1 A
• i B
• -i C
• 1 D

• (a + b)c = a . c + bc A
• a + b = b + a B
• (a + b) + c = a + (b + c) C
• a(b+ c) = ab + ac D

∀a,b ε R, ab = be is a

• Commutative law of multiplication A
• Closure law of multiplication B
• Associative law of multiplication C
• Multiplicative identity D

If z=(x,y) then z has no multiplicative inverse when

• x ≠ 0, y = 0 A
• x = 0, y = 0 B
• x = 0, y ≠ 0 C
• None of these D

O is ______

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

In R the number of identity elements w.r.t.'.' is

• One A
• Two B
• Three C
• Four D

• 
  A
• 
  B
• 
  C
• 
  D

• Principle of equality of fractions A
• Rule for product of fraction B
• Rule for quotient of fraction C

The equation |x +4| = x has solution

• x = -2 A
• x = 2 B
• x = -4 C
• x = 4 D

What is the conjugate of -7 -2i ?

• -7 + 2i A
• 7 +2i B
• 7 -2i C
• √53 D

Any recurring decimal represents a

• Irrational no A
• Integer B
• Rational no C
• None of these D