Question(s) from Search: IIT

Let f : ℝ → ℝ be any function. Define g : ℝ → ℝ by g (x) = |f (x)| for all x. Then g is

a) Onto if f is onto

b) One to one if f is one to one

c) Continuous if f is continuous

d) Differentiable if f is differentiable

Evaluate

a)

b)

c)

d)

One or more than one correct option

The circle C₁ : x² + y² = 3 with centre at O intersect the parabola x² = 2y at the point P in the first quadrant. Let the tangent to the circle C₁ at P touches other two circles C₂ and C₃ at R₂ and R₃ respectively. Suppose C₂ and C₃ have equal radii $2\sqrt{3}$

and centres Q₂ and Q₃ respectively. If Q₂ and Q₃ lie on the Y- axis, then

a) $Q_2{Q}_3=12$

b) $R_2{R}_3=4\sqrt{6}$

c) $\mathrm{area}\mathrm{of}△{}_2{R}_3\mathrm{is}R\sqrt{2}$

d) $\mathrm{area}\mathrm{of}△{\mathrm{PQ}}_2{Q}_3\mathrm{is}4\sqrt{2}$

Let f : ℝ → ℝ be a function defined by f (x) =  . The set of points where f (x) is not differentiable is

a) }

b)

c) {0, 1}

d)

The circle passing through the point (−1, 0) and touching the Y – axis at (0, 2) also passes through the point

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

b) $\left(\frac{-5}{2},0\right)$

c) $\left(\frac{-3}{2},\frac{5}{2}\right)$

d) $(-\mathrm{4,}0)$

Let a, b, c be positive real numbers such that b² – 4ac > 0 and let α₁ = c. Prove by induction that
 

Is well defined and  for n=1, 2, …

Here well defined means that the denominator in the expression of  is not zero.

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

Solve the following equation for x
 

a) −1

b)

c) 0

d) −1 and

If f is a differentiable function satisfying  for all n ≥ 1,

n  I then

a)

b)

c)

d)  is not necessarily zero

Evaluate

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

Multiple choices

The function f (x) = 1 + |sinx| is

a) continuous nowhere

b) continuous everywhere

c) differentiable nowhere

d) not differentiable at x = 0

e) not differentiable at infinite number of points

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)

Let f and g be increasing and decreasing functions, respectively from [0, ∞) to [0, ∞). Let h(x) =f(g(x)). If h(0) = 0 then h(x) – h(t) is

a) Always zero

b) Always negative

c) Always positive

d) Strictly increasing

e) None of these

Let E = {1, 2, 3, 4} and F = {1, 2} then the number of onto functions from E to F is

a) 14

b) 16

c) 12

d) 8

On the interval [0, 1] the function  takes the maximum value at the point

a) 0

b)

c)

d)

Let f (x) be continuous and g (x) be a discontinuous function. Prove that f (x) + g (x) is a discontinuous function.

a) True

b) False

c) Could be continuous or discontinuous

Find the coordinates of the point at which the circles x² + y² – 4x – 2y = – 4 and  x² + y² – 12x – 8y = – 36  touch each other. Also find the equation of the common tangents touching the circles at distinct points.

Draw the graph of the function y = [x] + |1 – x|, – 1 ≤ x ≤ 3. Determine the points, if any, where the function is not differentiable.

a) y is differentiable everywhere

b) y is not differentiable at x = 0

c) y is not differentiable at x = 0, 1, 2

d) y is not differentiable at x = 0, 1, 2 and 3

In how many ways can a pack of 52 cards be divided in 4 sets, three of them having 17 cards each and fourth just one card.

The area bounded by the curves

  and   is

a) 1

b) 2

c)

d) 4

Let ABC be an equilateral triangle inscribed in the circle x² + y² = a². Suppose perpendiculars from A, B, C to the major axis of the ellipse  (a > b) meet the ellipse respectively at P, Q, R so that P, Q, R are on the same side of the major axis. Prove that the normals drawn at the points P, Q and R are concurrent.

Which of the following pieces of data does not uniquely determine an acute angled triangle ABC (R being the radius of the circumcircle).

a) a, sinA, sinB

b) a, b , c

c) a, sinB, R

d) a, sinA, R

Let f(x), x ≥ 0 be a non-negative function and let F(x) = . For some c > 0, f(x) ≤ cF(x) for all x ≥ 0. Then for all x ≥ 0, f(x) =

a) 0

b) 1

c) 2

d) 4