Question(s) from Search: IIT

Let O be the vertex and Q be any point on the parabola x² = 8y. If the point P divides the line segment $\widehat{\mathrm{OQ}}$

internally in the ratio 1 : 3 then the locus of P is

a) x² = y

b) y² = x

c) y² = 2x

d) x² = 2y

Let S be the focus of the parabola y² = 8x and PQ be the common chord of the circle x² + y² – 2x – 4y = 0 and the given parabola. The area of △QPS is

a) 2 sq. units

b) 4 sq. units

c) 6 sq. units

d) 8 sq. units

Let a, r, s, t be non-zero real numbers. Let P(at², 2at), Q, R(ar², 2ar and S(as², 2as) be distinct points on the parabola y² = 4ax. Suppose PQ is the focal chord and QR and PK are parallel, where K is point (2a, 0)If st = 1 then the tangent at P and normal at S to the parabola meet at a point whose ordinate is

a) $\frac{{\left(t^2+1\right)}^2}{2t^3}$

b) $\frac{a{\left(t^2+1\right)}^2}{2t^3}$

c) $\frac{{a\left(t^2+1\right)}^2}{r^3}$

d) $\frac{{a\left(t^2+2\right)}^2}{r^3}$

The tangent PT and the normal PN of the parabola y² = 4ax at the point P on it meet its axis at the points T and N respectively. The locus of the centroid of the triangle PTM is a parabola whose

a) Vertex is $\left(\frac{2a}{3},0\right)$

b) Directrix is x = 0

c) Latus rectum is $\frac{2a}{3}$

d) Focus is (a, 0)

Consider the following linear equations
ax + by + cz = 0
bx + cy + az = 0
cx + ay + bz = 0
Match the statements/expressions in column 1 with column 2

Suppose , , are the vertices of an equilateral triangle inscribed in the circle  = 2. If = 1 + i, then find  and .

a)

b)

c)

d) None of the above

For any positive integers m, n (with n ≥ m), we are given that
  
Deduce that
  

The value of the integral $\underset{-\pi /2}{\overset{\pi /2}{\int }}\left(x^2+\log \frac{\pi -x}{\pi +x}\right)\mathrm{cosx}\mathrm{dx}$

is equal to

a) $0$

b) $\frac{{\pi }^2}{2}-4$

c) $\frac{{\pi }^2}{2}+4$

d) $\frac{{\pi }^2}{2}$

Let F : ℝ → ℝ be a thrice differentiable function. Suppose that F(1) = 0, F(3) = −4 and F′(x) < 0 for all x ε (1, 3). Let f(x) = x F(x) for all x ε ℝ.If $\underset{1}{\overset{3}{\int }}{x}^2{F}^{\prime }\left(x\right)\mathrm{dx}=-12$

and $\underset{1}{\overset{3}{\int }}{x}^3{F^{\prime \prime }\left(x\right)\mathrm{dx}=40}^{}$ , then the correct expression is/are

a) $9f^{\prime }\left(3\right)+f^{\prime }\left(1\right)-32=0$

b) $\underset{1}{\overset{3}{\int }}f\left(x\right)\mathrm{dx}=12$

c) $9f^{\prime }\left(3\right)-f^{\prime }\left(1\right)+32=0$

d) $\underset{1}{\overset{3}{\int }}f\left(x\right)\mathrm{dx}=-12$

One or more than one correct options

The options with the values of α and L that satisfy the equation $\frac{\underset{0}{\overset{4\pi }{\int }}{e}^t\left[{\sin }^6\mathrm{\alpha t}+{\cos }^4\mathrm{\alpha t}\right]\mathrm{dt}}{\underset{0}{\overset{\pi }{\int }}{e}^t\left[{\sin }^6\mathrm{\alpha t}+{\cos }^4\mathrm{\alpha t}\right]\mathrm{dt}}=L$

is/are

a) $\alpha =\mathrm{2,}L=\frac{e^{4\pi }-1}{e^{\pi }-1}$

b) $\alpha =\mathrm{2,}L=\frac{e^{4\pi }+1}{e^{\pi }+1}$

c) $\alpha =\mathrm{4,}L=\frac{e^{4\pi }-1}{e^{\pi }-1}$

d) $\alpha =\mathrm{4,}L=\frac{e^{4\pi }+1}{e^{\pi }+1}$

The number of points in the interval $\left[-\sqrt{13},\sqrt{13}\right]$

in which $f\left(x\right)=\sin \left(x^2\right)+\cos \left(x^2\right)$ attains its maximum value is

a) 8

b) 2

c) 4

d) 0

If $\alpha =\underset{0}{\overset{1}{\int }}{e}^{\left(9x+{3\tan }^{-1}x\right)}\left(\frac{12+{9x}^2}{1+x^2}\right)\mathrm{dx}$

Where ${\tan }^{-1}x$ takes only principal values then the value of $\left({\log }_e\left|1+\alpha \right|-\frac{3\pi }{4}\right)$ is

a) 6

b) 9

c) 8

d) 11

The intercept on X axis made by the tangent to the curve $y=\underset{0}{\overset{x}{\int }}\left|t\right|\mathrm{dt},t\in R$

which is parallel to the line y = 2x are equal to

a) ±1

b) ±2

c) ±3

d) ±4

The common tangent to the curve x² + y² = 2 and the parabola y² = 8x touch the circle at the points P, Q and the parabola at the points R, S. Then the area (in square units) of the quadrilateral PQRS is

a) 3

b) 6

c) 9

d) 15

The area (in square units) of the region described by (x, y) : y² < 2x and y ≥ 4x – 1 is

a) $\frac{7}{32}$

b) $\frac{9}{32}$

c) $\frac{3}{2}$

d) $\frac{5}{3}$

Let f: [−1, 2] → [0, ∞) be a continuous function such that f(x) = f(1 –x), Ɐ x ∈ [−1, 2]. If $R_1=\underset{-1}{\overset{2}{\int }}xf\left(x\right)\mathrm{dx}$

and $R_2$ are the area of the region bounded by y = f(x), x = −1, x = 2 and the X- axis. Then

a) R₁ = 2R₂

b) R₁ = 3R₂

c) 2R₁ = R₂

d) 3R₁ = R₂

If $\left(2+\mathrm{sinx}\right)\frac{\mathrm{dy}}{\mathrm{dx}}+\left(y+1\right)\mathrm{cosx}=0\wedge y\left(0\right)=1$

, then $y\left(\frac{\pi }{2}\right)$ is equal to

a) $\frac{1}{3}$

b) $\frac{-2}{3}$

c) $\frac{-1}{3}$

d) $\frac{4}{3}$

If , i = 1, 2, 3 are polynomials in x such that  and

F(x) =  
then (x) at x = a is equal to

a) – 1

b) 0

c) 1

d) 2

If  then f (x) increases in

a) (−2, 2)

b) No value of x

c) (0, ∞)

d) (−∞, 0)

If n is a positive integer and 0 ≤ v < π then show that

 for every 0 < α, β < 2.

The value of  where x > 0 is

a) 0

b) – 1

c) 1

d) 2

The value of

a) 5050

b) 5051

c) 100

d) 101

Multiple choices

Let g (x) = x f (x), where   at x = 0

a) g is  but  is not continuous

b) g is  while f is not

c) f and g are both differentiable

d) g is  and  is continuous

A five digit number divisible by 3 is formed using the numerals 0, 1, 2, 3, 4, and 5 without repetition. Total number of ways this can be done is

a) At least 30

b) At most 20

c) Exactly 25

d) None of these