ECAT Pre General Science MCQ Test With Answer for Mathematics Chapter 1

• 
  A
• 
  B
• 
  C
• 
  D

The additive identity of real number is

• 1 A
• 2 B
• 1/2 C
• 0 D

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

π is the ration of

• Area of a circle to its diameter A
• Area of a circle to its radius B
• Circumference of a circle to its diameter C
• Circumference of circle to its radius D

∀ z ∈ C, multipliucative is

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

The real number system contains.

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

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

If z₁ = (a,b), z₂=(c,d), then z₁ z₂ = -------------------

• (ac,bd) A
• (ac+bd, ad-bc) B
• (ac-bd , ad+bc) C
• (ac-bd , ad-bc) D

• 0 A
• 1 B
• -1 C
• None of these D

Every prime number is also

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

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

π is ______

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

In R, the multiplicative inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

24 can be written as a product of

• Odd factors A
• Even factors B
• Whole factors C
• Prime factors D

The square root of 2i - 20i is

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

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

• 2ⁿ A
• 2ⁿ² B
• 2.n C
• n² 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

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

Name the property used in 4 + 9 = 9 + 4

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

• N A
• r B
• 2r C
• π D

The additive inverse of 1 is

• 1 A
• -1 B
• 0 C
• Does not exist D

• real number A
• complex number B
• rational number C
• irrational number D

The additive inverse of 0 is

• 1 A
• -1 B
• 0 C
• Does not exist D

The additive inverse of 2/3 is

• 3/2 A
• -2/3 B
• -3/2 C
• 0 D

• 
  A
• 
  B
• 
  C
• 
  D

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

• One A
• Two B
• Three C
• Four D

In (x + iy), y is called as

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

The property used in -3 <-2 ⇒0 <1

• Commutative property A
• Additive property of inequality B
• Additive inverse C
• Additive identity D

• are real no A
• both are not real B
• are imaginary no C
• both are imaginary D