Competition Level Test: Application Of Derivative- 1
30 Questions MCQ Test Mathematics For JEE | Competition Level Test: Application Of Derivative- 1
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The two curves x3 - 3xy2 + 2 = 0 and 3x2 y - y3 - 2 = 0
m1m2 = -1 ⇒ Curves are orthogonal
The function f (x) = cot-1 x+ x increases in the interval
The real number x (x > 0) when added to its reciprocal gives the minimum sum at x equals
Minimum occurs at x = 1
If the function f (x) = 2x3 - 9ax2 + 12a2x + 1, where a > 0 , attains its maximum and minimum at p and q respectively such that p² = q, then ‘a’ equals
If 2a + 3b + 6c = 0, then at least one root of the equation ax2 + bx + c = 0 lies in the interval
By Roll’s theorem, at least one root of f ' (x) =0 lies in (0, 1)
A point on the parabola y2 = 18x at which the ordinate increases at twice the rate of the abscissa, is
y² = 18 x .....(i)
Differentiating w.r.t t
The normal to the curve x = a (1 + cos θ) , y = a sin θ at 'θ' always passes through the fixed point
Equation of normal at point (a(1 + cos θ) ,a sin θ) is
It is clear that normal passes through fixed point (a, 0)
Angle between the tangents to the curve y = x2 - 5x + 6 at the points (2, 0) and (3, 0) is
Product of slopes = -1 ⇒ angle between tangents is π/2
A function is matched below against an interval where it is supposed to be increasing, Which of the following pairs is incorrectly matched?
A spherical iron ball 10 cm in radius is coated with a layer of ice of uniform thickness that melts at a rate of 50 cm³/min. When the thickness of ice is 15 cm, then the rate at which the thickness of ice decreases, is
Area of the greatest rectangle that can be inscribed in the ellipse
Any point on ellipse is P (x, y) = (a cosθ, b sinθ)
Area of rectangle = 4ab cosθ sinθ
= 2ab sinθ
∴ Maximum area = 2ab.
Let f (x) be differentiable for all x. If f (1) =-2 and f '(x) > 2 for x ∈ (1, 6) then
The normal to the curve x = a (cos θ + θ sin θ), y = a (sin θ - θ cos θ) at any point 'θ' is such that
Equation of normal is
⇒ Angle made with x – axis is 
The function
has a local minimum at
A value of c for which the conclusion of Mean value Theorem holds for the function f (x) = loge x on the interval [1, 3] is
The function f (x) = tan-1 (sin x cos x) is an increasing function in
Suppose the cubic x3 - px + q = 0 has three distinct real roots where p > 0 and q > 0. Then, which one of the following holds?
Graph of y = x2 - px + q cuts x-axis at three distinct pints
The shortest distance between the line y - x= 1 and the curve x =y2 is
Condition for shortest distance is slope of tangent to x = y² must be same as slope of line y = x + 1
Given p (x) = x4 + ax3 + bx2 + cx + d such that x = 0 is the only real root of p' (x) = 0 . If p (-1) < p (1) , then in the interval [-1,1]
p ' (x) has only one change of sign. ⇒ x = 0 is a point of minima.
P(-1) =1- a + b + d P(0) = d
P(1) =1+ a + b + d
⇒ P (-1) < P (1) , P (0) < P (1) , P (-1) > P ( 0)
⇒ P (-1) is not minimum but P(1) is maximum
The equation of the tangent to the curve 
that is parallel to the x-axis is
(2, 3) is point of contact thus y = 3 is tangent
Let f : R → R be defined by
If f has a local minimum at x = - 1, then a possible value of k is
∴ f has a local minimum at x = - 1
Possible value of k is – 1
Let f : R → R be a continuous function defined by
Statement-1 : 
Statement -2 : 
Hence correction option is (d)
Slope of normal at (1, 1) = - 1
∴ Equation of normal y -1 = -1(x -1)
y +x= 2
Solving we get point as 
So in forth quadrant
Consider the function, f (x) =| x - 2 | + | x - 5 | .x ∈ R
Statement -1 : f '(4) = 0
Statement -2 : f is continous in [2, 5], differentiable in (2, 5) and f (2) = f (5)
f (x) is constant is [2, 5]
A spherical balloon is filled with 4500 π cubic meters of helium gas. If a leak in the balloon causes the gas to escape at the rate of 75 π cubic meters per minute, then the rate (in metres per minute) at which the radius of the balloon decreases 49 minutes after the leakage began is
Let a, b ∈ R be such that the function f given by f (x) = In | x | +bx2 + ax, x ≠ 0 has extreme values at x =-1 and x = 2.
Statement – 1: f has local maximum at x = - 1 and at x = 2.
Statement-2 : 
The real number k for which the equation, 2x3 + 3x + k = 0 has two distinct real roots in [0, 1]
f ' (x) = 6x2+ 3
⇒ so f(x) is increasing
equation cannot have 2 distinct roots.
The function f (x) = sin4 x+ cos4 x Increasing if
f '(x) = 4 sin3 x cos x - 4 cos3 x sin x = - sin 4 x for increasing f '(x) >0
dt then f decreasing in the interval
f ' (x) < 0
ex (x -1) ( x - 2) < 0
1 < x<2
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130 videos|359 docs|306 tests
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130 videos|359 docs|306 tests
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