ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

• x A
• 
  B
• y C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  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

Union of the sets of rational and irrational numbers is called 6th set of

• Natural numbers A
• Real numbers B
• Whole numbers C
• Prime numbers D

If z₁ =√-36 ,z₂ =√-25,z3 =√-16 then

• 15 A
• 15i B
• -15i C
• -15 D

If 4 > b or a < b than a = b is a

• Additive property A
• Transitive property B
• Trichotomy property of inequality C
• None of above 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

The conjugate of √5 i is

• √5 A
• -√5 i B
• i C
• 5i D

Geometrically, the modulus of a complex number represents its distance from the

• Point (1, 0) A
• Point (0, 1) B
• Point (1, 1) C
• Point (0, 0) D

• 
  A
• 
  B
• 
  C
• 
  D

202.04 is an example of

• Recurring decimals A
• Non-recurring decimals B
• Terminating decimals C
• None of above D

i¹⁰¹ =

• i A
• i² B
• -i C
• -1 D

1/3 is a decimal

• Recurring A
• Terminating B
• Non-terminating C
• None of the above D

π is ______

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

The negative square root of 9 can be written as:

• -√9 A
• √9 B
• √18 C
• -√18 D

A prime number can be a factor of a square only if it occurs in the square at least

• Once A
• Thirce B
• Twice C
• None of these D

Total number of subsets that can be formed out of the set {a,b,c} is

• 1 A
• 4 B
• 8 C
• 12 D

It is not possible to find the exact value of

• π A
• √9 B
• ∛27 C
• √1 D

• 
  A
• 
  B
• 
  C
• 
  D

i^-(4n+2) = -------------------------------

• 1 A
• i B
• -1 C
• -i D

The set of rationals numbers between 0 and I is

• Finite A
• Null set B
• Infinite C
• None of these D

In R, the multiplicative identity is

• 0 A
• 1 B
• -1 C
• None D

The real number system contains.

• Positive Numbers A
• Negative numbers B
• Zero C
• (option a, b and c) D

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

The value of x, and y, when (x + iy)²= 5 + 4i

• X = 2, y = 1 A
• X = -2, y = 1 B
• X = 2, y = -1 C
• X = 2, y = 2 D

If z₁ = 1 + 2i, z₂ = 3 + 4i then

• z₁ > z₂ A
• z₁ = z₂ B
• z₁ < z₂ C
• None of these D

i is equal

• (1 , 0) A
• (0 , 1) B
• (1 , 1) C
• (0 , 0) D

The symbol of irrational is

• W A
• N B
• Q C
• Q' D

The set of natural no. is closed under

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

Multiplicative inverse of "1" is

• 0 A
• ±1 B
• 1 C
• {0,1} D