Question # 1

Multiplicative inverse of -i is:

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i

-i

1

-1

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cancellation property w.r.t multiplication

cancellationproperty w.r.t addition

multiplicativeproperty

additiveproperty

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real numbers

complexnumbers

primenumbers

oddnumbers

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i

0

π, e are:

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integers

natural numbers

rationalnumbers

irrationalnumbers

i² + 1 =

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-1

0

i

1

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

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(-a, b)

(-a, -b)

(a, -b)

none of these

Conjugate of a + i b is:

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-a + ib

a + ib

-a - ib

a - ib

Product of a complex number and its conjugate is:

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a real number

irrationalnumber

a complexnumber

either real number or complexnumber

The additive inverse of a real number is a:

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0

-a

a

The multiplicative invers of a non-zero real number a is:

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0

-a

a

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additive property

multiplicative inverseproperty

transitive property

negative property

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

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not equal

equal

disjoint

empty

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0

i

-i

1

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Additive property

Multiplicativeproperty

Reflexiveproperty

Transitive property

Conjugate of a- i b is:

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b + ia

-a + ib

-a - ib

a + ib

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z is purely real

z is any complex number

z is purely imaginary

real part of z = imaginary part of z

The set of negative integers is closed with respect to:

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addition

multiplication

both (a) and (b)

subtraction

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The identity element with respect to addition is:

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0

1

-1

0 and 1

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