Question # 1

Modulus of 15 i + 20 is:

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20

15

25

none of the above

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0

i

-i

1

The additive inverse of a real number is a:

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0

-a

a

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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

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

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(-a, b)

(-a, -b)

(a, -b)

none of these

The identity element with respect to addition is:

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0

1

-1

0 and 1

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

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not equal

equal

disjoint

empty

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The set of all rational numbers between 2, 3 is:

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an empty set

an infinite set

a finite set

a power set

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rationalnumber

irrationalnumber

naturalnumber

wholenumber

Conjugate of a + i b is:

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-a + ib

a + ib

-a - ib

a - ib

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Reflexive property

Symmetricproperty

Transitiveproperty

Trichotomyproperty

π is defined as:

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ration of diameter of a circle to its circumference

ration of the circumference of a circle to its diameter

ration of area of a circle to its circumference

ration of the circumference of a circle to its area

Every real number is also a/an:

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integer

rational number

irrationalnumber

complexnumber

π, e are:

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integers

natural numbers

rationalnumbers

irrationalnumbers

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a + c = b + d

a + b = c + d

a - b = c - d

None of these

The set of negative integers is closed with respect to:

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addition

multiplication

both (a) and (b)

subtraction

The multiplicative identity of real numbers is:

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0

1

2

-1

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rational number

irrational number

natural number

whole number

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integer

rational number

irrational number

natural number

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