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

• Set of whole number A
• Rational Numbers B
• Complex numbers C
• Whole numbers D

The sum of complex number (a,b) and (c,d) is

• 
  A
• 
  B
• 
  C
• 
  D

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

• 
  A
• 
  B
• 
  C
• 
  D

Associative law of multiplication

• ab = ba A
• a(bc) = (ab) c B
• a(b+c) = ab + ac C
• (a + b)c = ac + bc D

The additive inverse of 2/3 is

• 3/2 A
• -2/3 B
• -3/2 C
• 0 D

• 
  A
• 
  B
• 
  C
• 
  D

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

• √3 i A
• √7 B
• -2-i C
• √5 D

In R, the multiplicative inverse of a is

• 0 A
• 1 B
• -a C
• 1/a D

√25 is a number

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

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

The conjugate of √5 i is

• √5 A
• -√5 i B
• i C
• 5i D

For any real numbers x,y,xy=o ⇒

• x ≠ 0 ∧ y ≠ 0 A
• x = 0 ∨ y = 0 B
• x = 0 C
• y = 0 D

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

There is no element common in

• N and W A
• E and W B
• N and O C
• Q and Q' D

• real part of z A
• imaginary part of z B
• conjugate of z C
• modulus of z D

• (a + b)c = a . c + bc A
• a + b = b + a B
• (a + b) + c = a + (b + c) C
• a(b+ c) = ab + ac D

• 
  A
• 
  B
• 
  C
• 
  D

• 
  A
• 
  B
• 
  C
• 
  D

i¹⁰¹=

• i A
• i² B
• -i C
• -1 D

Which element is the additive inverse of (a, b) in Complex numbers?

• (a, 0) A
• (0, b) B
• (a, b) C
• (-a, -b) D

• A positive integer A
• A negative integer B
• A natural number C
• An irrational number D

• Reflexive property A
• Symmetric property B
• Cancellations property w.r.t. addition C
• Transitive property D

The set of rational number is represented by

• W A
• R B
• Q' C
• Q
  
  
  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
• 
  B
• 
  C
• 
  D

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

It is not possible to find the exact value of

• π A
• √9 B
• ∛27 C
• √1 D

• 
  
  
  A
• 
  B
• 
  C
• 
  D

What is the conjugate of -7 -2i ?

• -7 + 2i A
• 7 +2i B
• 7 -2i C
• √53 D

Every real number is

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