ECAT Pre Engineering Mathematic MCQ Test With Answer for Chapter 1 (Number System)

If a and b are real numbers then a+b is also real number this law is called

• associative law of addition A
• closure law of addition B
• Distributive law of addition C
• Commutative law of addition D

• 0 A
• 1 B
• -1 C
• 2 D

Every recurring decimal represents

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

• 
  A
• 
  B
• 
  C
• 
  D

• N A
• r B
• 2r C
• π 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

• Rational A
• Irrational B
• Even C
• Odd 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

In (x + iy), y is called as

• Imaginary part A
• Complex number B
• Real part C
• None of above D

√(-1b) =?

• b i A
• -i b B
• b2 C
• i√b D

Multiplicative inverse of "1" is

• 0 A
• ±1 B
• 1 C
• {0,1} D

The multiplicative inverse of 4 is

• -4 A
• -1/4 B
• 1/4 C
• 1 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

1/3 is a decimal

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

Every real number is

• a positive integer A
• a rational number B
• a negative integer C
• a complex number D

π is ______

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

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• None of these D

Such fraction which can not be written in the form ofp⁄q where p,q and q≠ 0,such fractions are called.

• Fractinal numbers A
• Rational Numbers B
• Even Numbers C
• Whole Numbers D

Every whole number is

• A real number A
• An irrational number B
• A prime number C
• A negative integer 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

Any recurring decimal represents a

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

202.04 is an example of

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

(a-1)-1 =

• a-1 A
• a B
• -a C
• None of above D

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

The multiplicative inverse of 1 - 2i is

• 
  A
• 
  B
• 
  C
• 
  D

The multiplicative inverse of 2/3 is

• 3/2 A
• -2/3 B
• -3/2 C
• 1 D

It is not possible to find the exact value of

• π A
• √9 B
• ∛27 C
• √1 D