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Continuity and Differentiability

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Continuity and differentiability

Subtopic

Continuity and differentiability under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If y=ex+e−xy = e^x + e^{-x}, then dydx\frac{dy}{dx} is:

    A.

    ex+e−xe^x + e^{-x}

    B.

    ex−e−xe^x - e^{-x}

    C.

    −ex+e−x-e^x + e^{-x}

    D.

    00

  2. 2.

    The derivative of cosec x\text{cosec } x with respect to xx is:

    A.

    cosec xcot⁡x\text{cosec } x \cot x

    B.

    −cosec xcot⁡x-\text{cosec } x \cot x

    C.

    cosec2x\text{cosec}^2 x

    D.

    −cot⁡2x-\cot^2 x

  3. 3.

    The derivative of log⁡(log⁡x)\log(\log x) with respect to xx is:

    A.

    1log⁡x\frac{1}{\log x}

    B.

    1xlog⁡x\frac{1}{x \log x}

    C.

    xlog⁡x\frac{x}{\log x}

    D.

    1x\frac{1}{x}

Download the worksheet for Continuity and Differentiability - Continuity and differentiability to practice offline. It includes additional chapter-level practice questions.

Derivative of composite functions, chain rule

Subtopic

Derivative of composite functions, chain rule under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Differentiate y=sec⁡(tan⁡x)y = \sec(\tan \sqrt{x}). This is a triple composition. What is the first step of the chain rule derivative?

    A.

    sec⁡(tan⁡x)tan⁡(tan⁡x)\sec(\tan \sqrt{x}) \tan(\tan \sqrt{x})

    B.

    sec⁡2(x)\sec^2(\sqrt{x})

    C.

    12x\frac{1}{2\sqrt{x}}

    D.

    sec⁡(x)\sec(\sqrt{x})

  2. 2.

    Find the derivative of y=5x2y = 5^{x^2}.

    A.

    x2⋅5x2−1x^2 \cdot 5^{x^2-1}

    B.

    2x⋅5x22x \cdot 5^{x^2}

    C.

    2x⋅5x2log⁡52x \cdot 5^{x^2} \log 5

    D.

    5x2log⁡55^{x^2} \log 5

  3. 3.

    If y=log⁡(x2+2x+1)y = \log(x^2 + 2x + 1), find dydx\frac{dy}{dx}.

    A.

    1x2+2x+1\frac{1}{x^2 + 2x + 1}

    B.

    2x+1\frac{2}{x + 1}

    C.

    2x+2x2+2x+1\frac{2x + 2}{x^2 + 2x + 1}

    D.

    Both B and C are correct

Download the worksheet for Continuity and Differentiability - Derivative of composite functions, chain rule to practice offline. It includes additional chapter-level practice questions.

Derivative of inverse trigonometric functions, implicit functions, exponential and logarithmic functions

Subtopic

Derivative of inverse trigonometric functions, implicit functions, exponential and logarithmic functions under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The derivative of log⁡(log⁡x)\log(\log x) with respect to xx is:

    A.

    1x\frac{1}{x}

    B.

    1log⁡x\frac{1}{\log x}

    C.

    1xlog⁡x\frac{1}{x \log x}

    D.

    xlog⁡x\frac{x}{\log x}

  2. 2.

    What is the derivative of y=log⁡10xy = \log_{10} x?

    A.

    1x\frac{1}{x}

    B.

    1xln⁡10\frac{1}{x \ln 10}

    C.

    ln⁡10x\frac{\ln 10}{x}

    D.

    110x\frac{1}{10x}

  3. 3.

    Find dydx\frac{dy}{dx} if x−y=πx - y = \pi.

    A.

    π\pi

    B.

    11

    C.

    00

    D.

    −1-1

Download the worksheet for Continuity and Differentiability - Derivative of inverse trigonometric functions, implicit functions, exponential and logarithmic functions to practice offline. It includes additional chapter-level practice questions.

Logarithmic differentiation

Subtopic

Logarithmic differentiation under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If y=x1−xy = x^{1-x}, find dydx\frac{dy}{dx}.

    A.

    x1−x[1−xx+ln⁡x]x^{1-x} [\frac{1-x}{x} + \ln x]

    B.

    x1−x[1−xx−ln⁡x]x^{1-x} [\frac{1-x}{x} - \ln x]

    C.

    (1−x)x−x(1-x) x^{-x}

    D.

    x1−x[ln⁡x−1−xx]x^{1-x} [\ln x - \frac{1-x}{x}]

  2. 2.

    If y=(1−x)xy = (1-x)^x, find dydx\frac{dy}{dx}.

    A.

    (1−x)x[ln⁡(1−x)−x1−x](1-x)^x [\ln(1-x) - \frac{x}{1-x}]

    B.

    (1−x)x[ln⁡(1−x)+x1−x](1-x)^x [\ln(1-x) + \frac{x}{1-x}]

    C.

    x(1−x)x−1x(1-x)^{x-1}

    D.

    (1−x)x[ln⁡(1−x)+1](1-x)^x [\ln(1-x) + 1]

  3. 3.

    If y=x7y = x^7, find dydx\frac{dy}{dx} (can be verified by logs).

    A.

    7x67x^6

    B.

    x7ln⁡xx^7 \ln x

    C.

    7xln⁡77^x \ln 7

    D.

    x6x^6

Download the worksheet for Continuity and Differentiability - Logarithmic differentiation to practice offline. It includes additional chapter-level practice questions.

Derivative of functions expressed in parametric forms

Subtopic

Derivative of functions expressed in parametric forms under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The coordinates of a moving point are given by x=etx = e^t and y=e2ty = e^{2t}. The graph represents the trajectory of the point in the first quadrant. Find the value of dydx\frac{dy}{dx} expressed in terms of tt.

    A.

    ete^t

    B.

    2e2t2 e^{2t}

    C.

    2et2 e^t

    D.

    12et\frac{1}{2} e^t

  2. 2.

    Consider the curve defined parametrically by x=2t2x = 2t^2 and y=4ty = 4t. The graph of this parabola is shown below. Determine the slope of the tangent to the curve at the point where t=1t = 1.

    A.

    22

    B.

    12\frac{1}{2}

    C.

    11

    D.

    44

  3. 3.

    A particle moves in the xyxy-plane such that its coordinates at any time tt are given by x=acos⁡(t)x = a \cos(t) and y=asin⁡(t)y = a \sin(t), where aa is a constant. The path of the particle is a circle as shown in the diagram. Find dydx\frac{dy}{dx} at t=π4t = \frac{\pi}{4}.

    A.

    11

    B.

    −1-1

    C.

    00

    D.

    2\sqrt{2}

Download the worksheet for Continuity and Differentiability - Derivative of functions expressed in parametric forms to practice offline. It includes additional chapter-level practice questions.

Second order derivatives

Subtopic

Second order derivatives under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Find the second order derivative of y=x2log⁡xy = x^2 \log x.

    A.

    2log⁡x+12 \log x + 1

    B.

    2log⁡x+32 \log x + 3

    C.

    2log⁡x2 \log x

    D.

    2x\frac{2}{x}

  2. 2.

    If y=log⁡(sin⁡x)y = \log(\sin x), find y′′y''.

    A.

    cot⁡x\cot x

    B.

    −csc⁡2x-\csc^2 x

    C.

    csc⁡2x\csc^2 x

    D.

    −sec⁡2x-\sec^2 x

  3. 3.

    Find d2ydx2\frac{d^2y}{dx^2} for y=1x3y = \frac{1}{x^3}.

    A.

    −3x4-\frac{3}{x^4}

    B.

    12x5\frac{12}{x^5}

    C.

    −12x5-\frac{12}{x^5}

    D.

    6x5\frac{6}{x^5}

Download the worksheet for Continuity and Differentiability - Second order derivatives to practice offline. It includes additional chapter-level practice questions.

Continuity

Subtopic

Continuity under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    At x=3x = 3, the function f(x)={x+3,x<36,x=32x,x>3f(x) = \begin{cases} x + 3, & x < 3 \\ 6, & x = 3 \\ 2x, & x > 3 \end{cases} is:

    A.

    Continuous

    B.

    Discontinuous

    C.

    Not defined

    D.

    None of these

  2. 2.

    Which of the following is always true for a continuous function ff on [a,b][a, b]?

    A.

    ff is bounded

    B.

    ff must be differentiable

    C.

    ff must be a polynomial

    D.

    f(a)f(a) must be 00

  3. 3.

    If f(x)={x2−3x+2x−2,x≠2k,x=2f(x) = \begin{cases} \frac{x^2 - 3x + 2}{x - 2}, & x \neq 2 \\ k, & x = 2 \end{cases} is continuous at x=2x = 2, then kk is:

    A.

    11

    B.

    22

    C.

    00

    D.

    33

Download the worksheet for Continuity and Differentiability - Continuity to practice offline. It includes additional chapter-level practice questions.

Algebra of continuous functions

Subtopic

Algebra of continuous functions under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If f(x)=x2f(x) = x^2 is continuous and g(x)=1x−1g(x) = \frac{1}{x-1} is continuous for x≠1x \neq 1, then h(x)=f(x)⋅g(x)h(x) = f(x) \cdot g(x) is:

    A.

    Continuous for all xx

    B.

    Discontinuous at x=0x=0

    C.

    Discontinuous at x=1x=1

    D.

    Discontinuous at x=−1x=-1

  2. 2.

    If f(x)=2x+3f(x) = 2x + 3 and g(x)=1xg(x) = \frac{1}{x}, where is the sum (f+g)(x)(f+g)(x) continuous?

    A.

    (−∞,0)∪(0,∞)(-\infty, 0) \cup (0, \infty)

    B.

    (−∞,∞)(-\infty, \infty)

    C.

    (0,∞)(0, \infty)

    D.

    x=0x = 0 only

  3. 3.

    For f(x)=sin⁡(x)f(x) = \sin(x) and g(x)=x2g(x) = x^2, the composite function (f∘g)(x)=sin⁡(x2)(f \circ g)(x) = \sin(x^2) is continuous because:

    A.

    Both are linear functions

    B.

    The composition of two continuous functions is continuous

    C.

    The product of two continuous functions is continuous

    D.

    The sum of two continuous functions is continuous

Download the worksheet for Continuity and Differentiability - Algebra of continuous functions to practice offline. It includes additional chapter-level practice questions.

Differentiability

Subtopic

Differentiability under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Find the derivative of y=1xy = \frac{1}{\sqrt{x}} with respect to xx.

    A.

    −12xx-\frac{1}{2x\sqrt{x}}

    B.

    12xx\frac{1}{2x\sqrt{x}}

    C.

    −12x-\frac{1}{2\sqrt{x}}

    D.

    −1x2\frac{-1}{x^2}

  2. 2.

    Find the derivative of y=log⁡(ex)y = \log(e^x) with respect to xx.

    A.

    11

    B.

    exe^x

    C.

    1/ex1/e^x

    D.

    xx

  3. 3.

    Find the derivative of y=ex2y = e^{x^2} with respect to xx.

    A.

    2xex22x e^{x^2}

    B.

    ex2e^{x^2}

    C.

    2ex22 e^{x^2}

    D.

    x2ex2−1x^2 e^{x^2-1}

Download the worksheet for Continuity and Differentiability - Differentiability to practice offline. It includes additional chapter-level practice questions.

Exponential and Logarithmic Functions

Subtopic

Exponential and Logarithmic Functions under Continuity and Differentiability for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Find ddx(ln⁡(ln⁡x))\frac{d}{dx}(\ln(\ln x)) for x>1x > 1.

    A.

    1xln⁡x\frac{1}{x \ln x}

    B.

    1ln⁡x\frac{1}{\ln x}

    C.

    1x2\frac{1}{x^2}

    D.

    exe^x

  2. 2.

    If y=ecos⁡xy = e^{\cos x}, then dydx\frac{dy}{dx} is:

    A.

    ecos⁡xe^{\cos x}

    B.

    sin⁡xecos⁡x\sin x e^{\cos x}

    C.

    −sin⁡xecos⁡x-\sin x e^{\cos x}

    D.

    cos⁡xesin⁡x\cos x e^{\sin x}

  3. 3.

    Differentiate y=ln⁡(sin⁡x)y = \ln(\sin x) with respect to xx.

    A.

    1sin⁡x\frac{1}{\sin x}

    B.

    cos⁡x\cos x

    C.

    cot⁡x\cot x

    D.

    tan⁡x\tan x

Download the worksheet for Continuity and Differentiability - Exponential and Logarithmic Functions to practice offline. It includes additional chapter-level practice questions.