The real part of the complex number a + bi is:

• b A
• -b B
• a C
• -a D

The ordered pairs (2, 5) and (5, 2) are:

• not equal A
• equal B
• disjoint C
• empty D

• closure property w.r.t multiplication A
• commutativeproperty w.r.t multiplication B
• associativeproperty w.r.t multiplication C
• trichotomy property D

• 
  A
• 
  B
• 
  C
• 
  D

• cancellation property w.r.t multiplication A
• cancellationproperty w.r.t addition B
• multiplicativeproperty C
• additiveproperty D

• i A
• 0 B
• 
  C
• 
  D

Which of the following is correct:

• 2 + 7i > 10 + i A
• 1 + i > 1 - i B
• 4 + 3i > 1 + 3i C
• none of these D

π, e are:

• integers A
• natural numbers B
• rationalnumbers C
• irrationalnumbers D

• additive property A
• multiplicative inverseproperty B
• transitive property C
• negative property D

• 
  A
• archimedean property B
• transitive property C
• multiplicative property D

If z = x + i y = r (cos Θ + i sin Θ), then arg z is:

• tan Θ A
• cos²Θ + sin²Θ B
• r C
• Θ D

• z is purely real A
• z is any complex number B
• z is purely imaginary C
• real part of z = imaginary part of z D

Conjugate of a + i b is:

• -a + ib A
• a + ib B
• -a - ib C
• a - ib D

Every real number is also a/an:

• integer A
• rational number B
• irrationalnumber C
• complexnumber D

Factors of x² + y² are:

• (x + iy) (x - iy) A
• (x + y) (x - y) B
• (x + y) (x + y) C
• none D

If z₁ = 4i and z₂ = 3 - 9i, then z₁ + z₂ =

• 3 - 5i A
• 3i - 5 B
• 7 - 9i C
• 3 + 5i D

Conjugate of complex number (-a, -b) is:

• (-a, b) A
• (-a, -b) B
• (a, -b) C
• none of these D

Modulus of 15 i + 20 is:

• 20 A
• 15 B
• 25 C
• none of the above D

The identity element with respect to addition is:

• 0 A
• 1 B
• -1 C
• 0 and 1 D

• integer A
• rational number B
• irrational number C
• natural number D