Question # 1

Modulus of 15 i + 20 is:

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20

15

25

none of the above

Division of a natural number by another natural number gives:

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always a natural number

always an integer

always a rationalnumber

always an irrational number

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integer

rational number

irrational number

natural number

The set of negative integers is closed with respect to:

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addition

multiplication

both (a) and (b)

subtraction

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

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additive property

multiplicative inverseproperty

transitive property

negative property

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closureproperty

associativeproperty

commutativeproperty

trichotomyproperty

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

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tan Θ

cos²Θ + sin²Θ

r

Θ

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0

i

-i

1

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Every real number is also a/an:

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integer

rational number

irrationalnumber

complexnumber

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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archimedean property

transitive property

multiplicative property

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a + c = b + d

a + b = c + d

a - b = c - d

None of these

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

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b

-b

a

-a

Multiplicative inverse of -i is:

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i

-i

1

-1

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closure property w.r.t multiplication

commutativeproperty w.r.t multiplication

associativeproperty w.r.t multiplication

trichotomy property

Factors of x² + y² are:

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(x + iy) (x - iy)

(x + y) (x - y)

(x + y) (x + y)

none

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