Check the below NCERT MCQ Questions for Class 12 Maths Chapter 6 Application of Derivatives with Answers Pdf free download. MCQ Questions for Class 12 Maths with Answers were prepared based on the latest exam pattern. We have provided Application of Derivatives Class 12 Maths MCQs Questions with Answers to help students understand the concept very well.

## Application of Derivatives Class 12 MCQs Questions with Answers

Question 1.
The sides of an equilateral triangle are increasing at the rate of 2cm/sec. The rate at which the are increases, when side is 10 cm is
(a) 10 cm²/s
(b) √3 cm²/s
(c) 10√3 cm²/s
(d) $$\frac{10}{3}$$ cm²/s

Answer

Answer: (c) 10√3 cm²/s

Question 2.
A ladder, 5 meter long, standing oh a horizontal floor, leans against a vertical wall. If the top of the ladder slides downwards at the rate of 10 cm/sec, then the rate at which the angle between the floor and the ladder is decreasing when lower end of ladder is 2 metres from the wall is
(a) $$\frac{1}{10}$$ radian/sec
(b) $$\frac{1}{20}$$ radian/sec
(c) 20 radiah/sec
(d) 10 radiah/sec

Answer

Answer: (b) $$\frac{1}{20}$$ radian/sec

Question 3.
The curve y – x1/5 at (0, 0) has
(a) a vertical tangent (parallel to y-axis)
(b) a horizontal tangent (parallel to x-axis)
(c) an oblique tangent
(d) no tangent

Answer

Answer: (b) a horizontal tangent (parallel to x-axis)

Question 4.
The equation of normal to the curve 3x² – y² = 8 which is parallel to the line ,x + 3y = 8 is
(a) 3x – y = 8
(b) 3x + y + 8 = 0
(c) x + 3y ± 8 = 0
(d) x + 3y = 0

Answer

Answer: (c) x + 3y ± 8 = 0

Question 5.
If the curve ay + x² = 7 and x³ = y, cut orthogonally at (1, 1) then the value of a is
(a) 1
(b) 0
(c) -6
(d) 6

Answer

Answer: (d) 6

Question 6.
If y = x4 – 10 and if x changes from 2 to 1.99 what is the change in y
(a) 0.32
(b) 0.032
(c) 5.68
(d) 5.968

Answer

Answer: (a) 0.32

Question 7.
The equation of tangent to the curve y (1 + x²) = 2 – x, w here it crosses x-axis is:
(a) x + 5y = 2
(b) x – 5y = 2
(c) 5x – y = 2
(d) 5x + y = 2

Answer

Answer: (a) x + 5y = 2

Question 8.
The points at which the tangents to the curve y = x² – 12x +18 are parallel to x-axis are
(a) (2, – 2), (- 2, -34)
(b) (2, 34), (- 2, 0)
(c) (0, 34), (-2, 0)
(d) (2, 2),(-2, 34).

Answer

Answer: (d) (2, 2),(-2, 34).

Question 9.
The tangent to the curve y = e2x at the point (0, 1) meets x-axis at
(a) (0, 1)
(b) (-$$\frac{1}{2}$$, 0)
(c) (2, 0)
(d) (0, 2)

Answer

Answer: (b) (-$$\frac{1}{2}$$, 0)

Question 10.
The slope of tangent to the curve x = t² + 3t – 8, y = 2t² – 2t – 5 at the point (2, -1) is
(a) $$\frac{22}{7}$$
(b) $$\frac{6}{7}$$
(c) $$\frac{-6}{7}$$
(d) -6

Answer

Answer: (c) $$\frac{-6}{7}$$

Question 11.
The two curves; x³ – 3xy² + 2 = 0 and 3x²y – y³ – 2 = 0 intersect at an angle of
(a) $$\frac{π}{4}$$
(b) $$\frac{π}{3}$$
(c) $$\frac{π}{2}$$
(d) $$\frac{π}{6}$$

Answer

Answer: (a) $$\frac{π}{4}$$

Question 12.
The interval on which the function f (x) = 2x³ + 9x² + 12x – 1 is decreasing is
(a) [-1, ∞]
(b) [-2, -1]
(c) [-∞, -2]
(d) [-1, 1]

Answer

Answer: (b) [-2, -1]

Question 13.
Let the f: R → R be defined by f (x) = 2x + cos x, then f
(a) has a minimum at x = 3t
(b) has a maximum, at x = 0
(c) is a decreasing function
(d) is an increasing function

Answer

Answer: (d) is an increasing function

Question 14.
y = x (x – 3)² decreases for the values of x given by
(a) 1 < x < 3
(b) x < 0
(c) x > 0
(d) 0 < x <$$\frac{3}{2}$$

Answer

Answer: (a) 1 < x < 3

Question 15.
The function f(x) = 4 sin³ x – 6 sin²x + 12 sin x + 100 is strictly
(a) increasing in (π, $$\frac{3π}{2}$$)
(b) decreasing in ($$\frac{π}{2}$$, π)
(c) decreasing in [$$\frac{-π}{2}$$,$$\frac{π}{2}$$]
(d) decreasing in [0, $$\frac{π}{2}$$]

Answer

Answer: (c) decreasing in [$$\frac{-π}{2}$$,$$\frac{π}{2}$$]

Question 16.
Which of the following functions is decreasing on(0, $$\frac{π}{2}$$)?
(a) sin 2x
(b) tan x
(c) cos x
(d) cos 3x

Answer

Answer: (c) cos x

Question 17.
The function f(x) = tan x – x
(a) always increases
(b) always decreases
(c) sometimes increases and sometimes decreases
(d) never increases

Answer

Answer: (a) always increases

Question 18.
If x is real, the minimum value of x² – 8x + 17 is
(a) -1
(b) 0
(c) 1
(d) 2

Answer

Answer: (d) 2

Question 19.
The smallest value of the polynomial x³ – 18x² + 96x in [0, 9] is
(a) 126
(b) 0
(c) 135
(d) 160

Answer

Answer: (b) 0

Question 20.
The function f(x) = 2x³ – 3x² – 12x + 4 has
(a) two points of local maximum
(b) two points of local minimum
(c) one maxima and one minima
(d) no maxima or minima

Answer

Answer: (c) one maxima and one minima

Question 21.
The maximum value of sin x . cos x is
(a) $$\frac{1}{4}$$
(b) $$\frac{1}{2}$$
(c) √2
(d) 2√2

Answer

Answer: (b) $$\frac{1}{2}$$

Question 22.
At x = $$\frac{5π}{6}$$, f (x) = 2 sin 3x + 3 cos 3x is
(a) maximum
(b) minimum
(c) zero
(d) neither maximum nor minimum

Answer

Answer: (d) neither maximum nor minimum

Question 23.
Maximum slope of the curve y = -x³ + 3x² + 9x – 27 is
(a) 0
(b) 12
(c) 16
(d) 32

Answer

Answer: (a) 0

Question 24.
f(x) = xx has a stationary point at
(a) x = e
(b) x = $$\frac{1}{e}$$
(c) x = 1
(d) x = √e

Answer

Answer: (b) x = $$\frac{1}{e}$$

Question 25.
The maximum value of ($$\frac{1}{x}$$)x is
(a) e
(b) e²
(c) e1/x
(d) ($$\frac{1}{e}$$)1/e

Answer

Answer: (d) ($$\frac{1}{e}$$)1/e

Question 26.
If the volume of a sphere is increasing at a constant rate, then the rate at which its radius is increasing is
(a) a constant
(b) proportional to the radius
(c) inversely proportional to the radius
(d) inversely proportional to the surface area

Answer

Answer: (d) inversely proportional to the surface area

Question 27.
A particle is moving along the curve x = at² + bt + c. If ac = b², then particle would be moving with uniform
(a) rotation
(b) velocity
(c) acceleration
(d) retardation

Answer

Answer: (c) acceleration

Question 28.
The distance Y metres covered by a body in t seconds, is given by s = 3t² – 8t + 5. The body will stop after
(a) 1 s
(b) $$\frac{3}{4}$$ s
(c) $$\frac{4}{3}$$ s
(d) 4 s

Answer

Answer: (c) $$\frac{4}{3}$$ s

Question 29.
The position of a point in time Y is given by x = a + bt + ct², y = at + bt². Its acceleration at timet Y is
(a) b – c
(b) b + c
(c) 2b – 2c
(d) 2$$\sqrt{b^2+c^2}$$

Answer

Answer: (d) 2$$\sqrt{b^2+c^2}$$

Question 30.
The function f(x) = log (1 + x) – $$\frac{2x}{2+x}$$ is increasing on
(a) (-1, ∞)
(b) (-∞, 0)
(b) (-∞, ∞)
(d) None of these

Answer

Answer: (a) (-1, ∞)

Question 31.
f(x) = ($$\frac{e^{2x}-1}{e^{2x}+1}$$) is
(a) an increasing function
(b) a decreasing function
(c) an even function
(d) None of these

Answer

Answer: (a) an increasing function

Question 32.
If f (x) = $$\frac{x}{sin x}$$ and g (x) = $$\frac{x}{tan x}$$, 0 < x ≤ 1, then in the interval
(a) both f (x) and g (x) are increasing functions
(b) both f (x) and g (x) are decreasing functions
(c) f(x) is an increasing function
(d) g (x) is an increasing function

Answer

Answer: (c) f(x) is an increasing function

Question 33.
The function f(x) = cot-1 x + x increases in the interval
(a) (1, ∞)
(b) (-1, ∞)
(c) (0, ∞)
(d) (-∞, ∞)

Answer

Answer: (d) (-∞, ∞)

Question 34.
The function f(x) = $$\frac{x}{log x}$$ increases on the interval
(a) (0, ∞)
(b) (0, e)
(c) (e, ∞)
(d) None of these

Answer

Answer: (c) (e, ∞)

Question 35.
The value of b for which the function f (x) = sin x – bx + c is decreasing for x ∈ R is given by
(a) b < 1
(b) b ≥ 1
(c) b > 1
(d) b ≤ 1

Answer

Answer: (c) b > 1

Question 36.
If f (x) = x³ – 6x² + 9x + 3 be a decreasing function, then x lies in
(a) (-∞, -1) ∩ (3, ∞)
(b) (1, 3)
(c) (3, ∞)
(d) None of these

Answer

Answer: (b) (1, 3)

Question 37.
The function f (x) = 1 – x³ – x5 is decreasing for
(a) 1 < x < 5
(b) x < 1
(c) x > 1
(d) all values of x

Answer

Answer: (d) all values of x

Question 38.
Function, f (x) = $$\frac{λ sin x+ 6 cos x}{2 sin x + 3 cos x}$$ is monotonic increasing, if
(a) λ > 1
(b) λ < 1
(c) λ < 4
(d) λ > 4

Answer

Answer: (d) λ > 4

Question 39.
The length of the longest interval, in which the function 3 sin x – 4 sin³ x is increasing is
(a) $$\frac{π}{3}$$
(b) $$\frac{π}{2}$$
(c) $$\frac{3π}{2}$$
(d) π

Answer

Answer: (d) π

Question 40.
2x³ – 6x + 5 is an increasing function, if
(a) 0 < x < 1
(b) -1 < x < 1
(c) x < -1 or x > 1
(d) -1 < x < –$$\frac{1}{2}$$

Answer

Answer: (c) x < -1 or x > 1

Question 41.
The function f(x) = x + cos x is
(a) always increasing
(b) always decreasing
(c) increasing for certain range of x
(d) None of these

Answer

Answer: (a) always increasing

Question 42.
The function which is neither decreasing nor increasing in ($$\frac{π}{2}$$, $$\frac{3π}{2}$$) is
(a) cosec x
(b) tan x
(c) x²
(d) |x – 1|

Answer

Answer: (b) tan x

Question 43.
The function /’defined by f(x) = 44 – 2x + 1 is increasing for
(a) x < 1
(b) x > 0
(c) x < $$\frac{1}{2}$$
(d) x > $$\frac{1}{2}$$

Answer

Answer: (d) x > $$\frac{1}{2}$$

Question 44.
The interval in which the function y = x³ + 5x² – 1 is decreasing, is
(a) (0, $$\frac{1}{3}$$)
(b) (0, 10)
(c) ($$\frac{-10}{3}$$, 0)
(d) None of these

Answer

Answer: (c) ($$\frac{-10}{3}$$, 0)

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