Question # 1

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

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Addition

Multiplications

Subtraction

None of these

The discriminant of the quadratic equation ax²+ bx + c = 0 is

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b²+ 4ac

b²- 4ac

4ac - b²

a²- 4ac

If P is a proposition then its negative is denoted by

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In-radius is denoted by

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r

η

r2

R

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7

5

6

None of these

(A∩Bc)c= -------------------------

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Ac∪Bc

Ac∪B

Ac∩B

None of these

If the sum of even coefficients in the expansion of (1+x)n is 128 then

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n=7

n=9

n=8

None

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The second degree equation of the form Ax2 +By2 +Gx +Fy +C =0 represent hyperbola if

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A = B≠ 0

A≠ B and both are of same sign

A≠ B both are of opposite sign

Either A = 0 or B =0

If l, m, n are the d.c.'s of a line, then

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l2+ m2+ n2= 0

l2+ m2+ n2= 1

l + m + n = 1

l = m = n = 1

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