Processing math: 15%




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1.

For a positive integer n, if the quadratic equation, x(x+1)+(x+1)(x+2)+.....+(x+¯n1)(x+n)=10n  has two consecutive integral solutions, then n is equal to


A) 12

B) 9

C) 10

D) 11



2.

The radius of a circle having minimum area, which touches the curve y=4-x2 and the line y=|x| , is


A) 2(\sqrt{2}+1)

B) 2(\sqrt{2}-1)

C) 4(\sqrt{2}-1)

D) 4(\sqrt{2}+1)



3.

The value of (^{21}C_{1}-^{10}C_{1})+(^{21}C_{2}-^{10}C_{2})+(^{21}C_{3}-^{10}C_{3})+.....+(^{21}C_{10}-^{10}C_{10}) is


A) 2^{21}-2^{11}

B) 2^{21}-2^{10}

C) 2^{20}-2^{9}

D) 2^{20}-2^{10}



4.

The normal to the curve y(x-2) (x-3)=x+6  at the point, where the curve intersects the Y-axis passes through the point


A) (-\frac{1}{2},-\frac{1}{2})

B) (\frac{1}{2},\frac{1}{2})

C) (\frac{1}{2},-\frac{1}{3})

D) (\frac{1}{2},\frac{1}{3})



5.

\lim_{x \rightarrow \frac{\pi}{2}} \frac{\cot x-\cos x}{(\pi-2x)^{3}} equals


A) \frac{1}{24}

B) \frac{1}{16}

C) \frac{1}{8}

D) \frac{1}{4}



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