Question # 1

The set { 1 , -1} is closed w.r.t.

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Addition

Multiplications

Subtraction

None of these

The square root of 2i - 20i is

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±(5 - 2i)

±(5+ 2i)

(5 - 2i)

None of these

The set of rational number is represented by

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W

R

Q'

Q

In (x +iy) y is called as

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Imaginary part

Complex number

Real part

None of above

i =

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√1

√2

√-2

√-1

The decimal fraction in which we have finite number of digits in its decimal part is called.

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recurring decimal fraction

Non terminating faction

Non recurring fraction

terminating decimal fraction

The value of x, and y, when (x + iy)²= 5 + 4i

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X = 2, y = -1

X = -2, y=1

X = 2, y = -1

X = 2, y = 2

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(a + b)c = ac + bc

a + b = b + a

(a + b) + c = a + (b + c)

a(b +c) = ab + ac

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The square root of every incomplete square is an

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Rational numbers

Even numbers

odd numbers

Irrational numbers

What is the conjugate of -7 -2i ?

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-7 + 2i

7 +2i

7 -2i

√53

i²=

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1

2

-1

0

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A rational number

A irrational number

An even integer

A factor of 36

i¹⁰¹ =

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i

i²

-i

-1

If z₁ = 1 + 2i, z₂ = 3 + 4i then

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z₁ > z₂

z₁ = z₂

z₁ < z₂

None of these

Name the property used in 4 x (5 x 8) = ( 4 x 5) x 8

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Associative property of addition

Associative property of multiplication

Additive identity

Multiplicative identity

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The square roots of negative numbers is called

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Real no

Complex no

Positive no

Negative no

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0

1

-1

2

What is the conjugate of -6 -i

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-6 +i

6 + i

-6 -i

6 -i

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Trichotomy property

Additive property of inequality

Transitive property

Multiplicative property

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15

15 i

-15 i

-15

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A natural number

A rational number

An irrational number

A whole number

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Principle of equality of fractions

Rule for product of fractions

Golden rule for fractions

Rule for quotient of fractions

√23 is

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A rational number

A irrational number

An even integer

A factor of 36

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i² =

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1

2

-1

0

Associative law of multiplication

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ab - ba

a(bc) = (ab) c

a(b + c) = ab +ac

(a +b)c = ac + bc

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