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1

IIT-JEE 1992

Subjective
In this questions there are entries in columns $$I$$ and $$II$$. Each entry in column $$I$$ is related to exactly one entry in column $$II$$. Write the correct letter from column $$II$$ against the entry number in column $$I$$ in your answer book.

Let the functions defined in column $$I$$ have domain $$\left( { - {\pi \over 2},{\pi \over 2}} \right)$$

$$\,\,\,\,$$Column $$I$$
(A) $$x + \sin x$$
(B) $$\sec x$$

$$\,\,\,\,$$Column $$II$$
(p) increasing
(q) decreasing
(r) neither increasing nor decreasing

Answer

$$\left( A \right) - \left( p \right),\left( B \right) - \left( r \right)$$
2

IIT-JEE 1992

Subjective
What normal to the curve $$y = {x^2}$$ forms the shortest chord?

Answer

$$x + \sqrt 2 \,y = \sqrt 2 $$

or

$$x - \sqrt {2\,} y = - \sqrt 2 $$

3

IIT-JEE 1992

Subjective
A cubic $$f(x)$$ vanishes at $$x=2$$ and has relative minimum / maximum at $$x=-1$$ and $$x = {1 \over 3}$$ if $$\int\limits_{ - 1}^1 {f\,\,dx = {{14} \over 3}} $$, find the cubic $$f(x)$$.

Answer

$${x^3} + {x^2} - x + 2$$
4

IIT-JEE 1991

Subjective
A window of perimeter $$P$$ (including the base of the arch) is in the form of a rectangle surmounded by a semi circle. The semi-circular portion is fitted with coloured glass while the rectangular part is fitted with clear glass transmits three times as such light per square meter as the coloured glass does.

What is the ratio for the sides of the rectangle so that the window transmits the maximum light ?

Answer

$${{6 + \pi } \over 6}$$

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