ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

What is the conjugate of -6 -i?

• -6 +i A
• 6+i B
• -6 -i C
• 6 -i D

The product of complex numbers (a,b) and (c,d) is

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

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• None of these D

In R, the multiplicative identity is

• 0 A
• 1 B
• -1 C
• None D

• 
  A
• 
  B
• 
  C

• (x, y) A
• (kx, y) B
• (x, ky) C
• (kx, ky) D

The multiplicative inverse of 1 - 2i is

• 
  A
• 
  B
• 
  C
• 
  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

I is not

• Real number A
• Natural number B
• Prime Number C
• Whole Number D

(a-1)-1 =

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

(√3+√5)+√7 = √3 +(√5 +√7) property used in above is

• Commutative property of addition A
• Closure property of addition B
• Additive inverse C
• Associative property w.r.t to adition D

In (x +iy) y is called as

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

• 
  A
• 
  B
• 
  C
• 
  D

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

202.04 is an example of

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

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

(a^-1)^-1=

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

What is the conjugate of -7 -2i?

• -7 + 2i A
• 7 + 2i B
• 7 -2i C
• None of these D

• 0 A
• 1 B
• -1 C
• None of these D

• 
  A
• 
  B
• 
  C
• 
  D

• 1 A
• -i B
• i C
• 0 D

Every real number is

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

4/√49 is a

• Irrational Number A
• Prime Number B
• Rational number C
• Whole number 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

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

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

Every irrational number is

• A real number A
• A prime number B
• A natural number C
• An integer D

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

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

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