ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

The square root of 2i - 20i is

• +-(5 - 2i) A
• +-(5 + 2i) B
• (5 - 2i) C
• None of these D

√(-1b) =?

• b i A
• -i b B
• b2 C
• i√b D

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

• One A
• Two B
• Three C
• Four D

The set of rational number is represented by

• W A
• R B
• Q' C
• Q
  
  
  D

1.4142135... is ______

• A natural number A
• A rational number B
• A prime number C
• An irrational number D

The square roots of negative numbers is called

• Real no A
• Complex no B
• Positive no C
• Negative no D

The set of positive integers, 0 and negative integers is known as the set of

• Natural numbers A
• Rational numbers B
• All integers C
• Irrational numbers D

∀ a ε R ∃ o ε R such that a + v = 0 + a = a is property of

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

√23 is

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

(7,9) +(3,-5) =

• (4,4) A
• (10,4) B
• (9,-5) C
• (7,3) D

∀ z ∈ C, multipliucative is

• (1,1) A
• (1,0) B
• (0,1) C
• None of these D

• 
  A
• 1 B
• -1 C
• 
  D

3/2 is

• An irrational number A
• Whole number B
• A positive integer C
• A rational number D

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

• 
  A
• 
  B
• 
  C
• 
  D

In set builder notation the set {0,1,2,........100} can be written as

• {x / xε B ∧ x ≤ 100} A
• {x / x ∈ W ∧ x < 101} B
• {x / x ∈ Z ∧ x < 101} C
• The set of first 100 whole numbers D

i² = 

• 1 A
• 2 B
• -1 C
• 0 D

The square root of every incomplete square is an

• Rational numbers A
• Even numbers B
• odd numbers C
• Irrational numbers D

Every prime number is also

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

Associative law of multiplication

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

The order axioms are satisfied by set of

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

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
• 
  B
• 
  C
• 
  D

• Reflexive property A
• Symmetric property B
• Transitive property C
• Additive property D

6 is

• A prime integer A
• An irrational number B
• A rational number C
• An odd integer D

The set of natural no. is closed under

• multiplication A
• subtraction B
• difference C
• division D

The polar form of complex number x ≠ I y =

• r cos θ+ r sin θ A
• r cos θ+ is sin θ B
• cos θ+ r sin θ C
• i cos θ+ i sin θ D

• 
  A
• 
  B
• 
  C
• 
  D
• 
  E

i =

• 
  A
• 
  B
• 
  C
• 
  D