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2.Find the equation of a straight line which passes through the point (3,6) and whose distance from the origin is 6 unit.
A.4x+3y−30=0
B.4x−3y−30=0
C.3x+4y−30=0
D.None of these
3.If a circle is drawn taking the straight line joining the points (0,−1) and (2,3) as diameter, then the length of the intercept which the circle cuts off from x-axis is-
A.4
B.2
C.3
D.32
4.If y=tan−16−5x5+6x, what is the value of dxdy?
A.1+x21
B.−1+x21
C.6(1+x2)5
D.None of these
5.For what value of k, will the tangent at the point x=1 of the curve y=k(x−1)(x+2) make an angle of 60∘ with x-axis?
A.31
B.32
C.23
D.3
6.For what value of C, will the tangent of the curve y=Cx(1+x) at the origin make an angle 30∘ with x-axis?
9.Find the nature of roots of the equation 2x2+6x+5=0
A.Complex & unequal
B.Complex & equal
C.Real & unequal
D.None of these
10.A stone is dropped into a well and the sound of striking the bottom of the well is heard after 321 sec. If the velocity of sound is 327ms−1, then the depth of the well will be-