ECAT Pre Engineering MCQ Test With Answer for Chapter 1 Mathematics

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

• 1 A
• 4 B
• 8 C
• 12 D

In R, the multiplicative identity is

• 0 A
• 1 B
• -1 C
• None D

In (x +iy) y is called as

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

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

Q∪ Q' =

• Q A
• Q' B
• N C
• R D

√11 is

• an irrational number A
• Rational number B
• odd number C
• Negative number D

The multiplicative inverse of -3i is

• 3i A
• -3i B
• -1/3i C
• 1/3 i D

(a+bi) - (c+di)=

• (a+b) = (c+d) A
• (a+c) + i(b+d) B
• (a - c) + (c- d)i C
• (a - c)+ (b - d)i D

Every recurring decimal represents

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

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

i¹⁰¹ =

• i A
• i² B
• -i C
• -1 D

3.5+5.4=5.4+3.5 =8.9 this property of addition is called

• additive identity A
• assoclative property B
• commulative property C
• closure property D

• 
  A
• 1 B
• -1 C
• 
  D

i =

• 
  A
• 
  B
• 
  C
• 
  D

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

• One A
• Two B
• Three C
• Four D

• x A
• 
  B
• y C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

i³=

• -1 A
• i B
• -i C
• 1 D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

Some of two real numbers is also a real number , this property is called:

• Commutative property w.r.t addition A
• Closure property w.r.t. addition B
• Associative property w.r.t. addition C
• Distributive property w.r.t addition D

• 
  A
• 
  B
• 
  C
• 
  D

The identity element with respect to subtraction is

• 0 A
• 1 B
• -1 C
• Does not exist D

Every real number is

• A complex number A
• A rational number B
• A natural number C
• A prime number D

The negative square root of 9 can be written as:

• -√9 A
• √9 B
• √18 C
• -√18 D

The solution set of the equation |3x + 2| = 5 is

• 
  A
• 
  B
• 
  C
• 
  D

3/2 is

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