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

• A rational number A
• A irrational number B
• An even integer C
• A factor of 36 D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

∀ z ∈ C, multipliucative is

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

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

3/4 is ______

• An odd number A
• An even number B
• A natural number C
• A rational number D

• 1 A
• -i B
• i C
• 0 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 = a A
• a < a B
• a > a C
• a²= a D

• -3 -2i A
• 3 +2i B
• 1 + 2i C
• 1 - 2i D

If Z = (1,2), then Z^-1= ?

• (0.2, 0.4) A
• (-0.2, 0.4) B
• (0.2, -0.4) C
• (-0.2, -0.4) D

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

• 2ⁿ A
• 2ⁿ² B
• 2.n C
• n² 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

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

• A positive integer A
• A negative integer 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

• 
  A
• 
  B
• 
  C
• 
  D

In polar form of complex number r =

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

• Closure law of addition A
• Closure law of multiplication B
• Commutative law of addition C
• Commutative law of multiplication D

• Additive property in R A
• Multiplication property in R B
• Cancellation property in R C
• Distribution property in R D

The negative square root of 9 can be written as:

• -√9 A
• √9 B
• √18 C
• -√18 D

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

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

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

if Z1 = 1+i, Z2= 2+3i, then |Z2 -Z1| =

• √3 i A
• √7 B
• -2-i C
• √5 D

• 15 A
• 15 i B
• -15 i C
• -15 D

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

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

• 1 A
• i B
• -1 C
• -i D

If in a set of real no a is additive identity then

• a+a = 2a A
• a+a = 1 B
• a+a = 0 C
• None of these D