The multiplicative identity of real numbers is:

• 0 A
• 1 B
• 2 C
• -1 D

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

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

• b A
• -b B
• a C
• -a D

The additive inverse of a real number is a:

• 0 A
• -a B
• a C
• 
  D

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

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

• 
  A
• x = 0, y = 0 B
• 
  C
• 
  D

Rational numbers are:

• repeating decimals A
• terminatingdecimals B
• periodicdecimals C
• all of these D

• 
  A
• 
  B
• 
  C
• 
  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

The set of negative integers is closed with respect to:

• addition A
• multiplication B
• both (a) and (b) C
• subtraction D

• Additive property A
• Multiplicativeproperty B
• Reflexiveproperty C
• Transitive property D

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

• Reflexive property A
• Symmetricproperty B
• Transitiveproperty C
• Trichotomyproperty 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

• real numbers A
• complexnumbers B
• primenumbers C
• oddnumbers D

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

• a A
• b B
• bi C
• none of these D

Factors of x² + y² are:

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

• 0 A
• i B
• -i C
• 1 D

• a + c = b + d A
• a + b = c + d B
• a - b = c - d C
• None of these D

i² + 1 =

• -1 A
• 0 B
• i C
• 1 D