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## Limits, Continuity and Differentiability

### Mathematics

#### Previous Years Questions

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$$\mathop {\lim }\limits_{x \to \infty } \left( {{{{x^2} + 1} \over {x + 1}} - ax - b} \right),(a,b \in R)$$ = 0. Then...
WB JEE 2022
Let f : [a, b] $$\to$$ R be continuous in [a, b], differentiable in (a, b) and f(a) = 0 = f(b). Then
WB JEE 2022
$$\mathop {\lim }\limits_{x \to 0} \left( {{1 \over x}\ln \sqrt {{{1 + x} \over {1 - x}}} } \right)$$ is
WB JEE 2022
Let $$f(x) = {a_0} + {a_1}|x| + {a_2}|x{|^2} + {a_3}|x{|^3}$$, where $${a_0},{a_1},{a_2},{a_3}$$ are real constants. The...
WB JEE 2022
The values of a, b, c for which the function $$f(x) = \left\{ \matrix{ {{\sin (a + 1)x + \sin x} \over x},x 0 \hfill ... WB JEE 2022 The$$\mathop {\lim }\limits_{x \to \infty } {\left( {{{3x - 1} \over {3x + 1}}} \right)^{4x}}$$equals WB JEE 2021 Let f : D$$\to$$R where D = [$$-$$0, 1]$$\cup$$[2, 4] be defined by$$f(x) = \left\{ {\matrix{ {x,} & {if} & {x \...
WB JEE 2021
Let $${S_n} = {\cot ^{ - 1}}2 + {\cot ^{ - 1}}8 + {\cot ^{ - 1}}18 + {\cot ^{ - 1}}32 + ....$$ to nth term. Then $$\math... WB JEE 2021 If$$I = \mathop {\lim }\limits_{x \to 0} sin\left( {{{{e^x} - x - 1 - {{{x^2}} \over 2}} \over {{x^2}}}} \right)$$, the... WB JEE 2021$$\mathop {\lim }\limits_{x \to 1} \left( {{1 \over {1nx}} - {1 \over {(x - 1)}}} \right)$$WB JEE 2020 Let$$0 &lt; \alpha &lt; \beta &lt; 1$$. Then,$$\mathop {\lim }\limits_{n \to \infty } \int\limits_{1/(k + \beta )}^{...
WB JEE 2020
Let f : R $$\to$$ R be twice continuously differentiable (or f" exists and is continuous) such that f(0) = f(1) = f'(0...
WB JEE 2020
If $$\mathop {\lim }\limits_{x \to 0} {\left( {{{1 + cx} \over {1 - cx}}} \right)^{{1 \over x}}} = 4$$, then $$\mathop {... WB JEE 2020 Let$$\phi (x) = f(x) + f(1 - x)$$and$$f(x) &lt; 0$$in [0, 1], then WB JEE 2020 The value of$$\mathop {\lim }\limits_{x \to {0^ + }} {x \over p}\left[ {{q \over x}} \right]$$is WB JEE 2019 A particle starts at the origin and moves 1 unit horizontally to the right and reaches P1, then it moves$${1 \over 2}$$... WB JEE 2019 Let$$a = \min \{ {x^2} + 2x + 3:x \in R\} $$and$$b = \mathop {\lim }\limits_{\theta \to 0} {{1 - \cos \theta } \over...
WB JEE 2019
$$\mathop {\lim }\limits_{x \to {0^ + }} {({e^x} + x)^{1/x}}$$
WB JEE 2019
The limit of the interior angle of a regular polygon of n sides as n $$\to$$ $$\infty$$ is
WB JEE 2019
$$\mathop {\lim }\limits_{x \to {0^ + }} ({x^n}\ln x),\,n &gt; 0$$
WB JEE 2019
Let $$f(x) = \left\{ {\matrix{ { - 2\sin x,} &amp; {if\,x \le - {\pi \over 2}} \cr {A\sin x + B,} &amp; {if\, ... WB JEE 2018 Let f : R$$ \to $$R be a twice continuously differentiable function such that f(0) = f(1) = f'(0) = 0. Then WB JEE 2018 Let f : [a, b]$$ \to $$R be such that f is differentiable in (a, b), f is continuous at x = a and x = b and moreover f... WB JEE 2018 Let$$f(x) = 3{x^{10}} - 7{x^8} + 5{x^6} - 21{x^3} + 3{x^2} - 7$$. Then$$\mathop {\lim }\limits_{h \to 0} {{f(1 - h) - ...
WB JEE 2018
Let f : [a, b] $$\to$$ R be differentiable on [a, b] and k $$\in$$ R. Let f(a) = 0 = f(b). Also let J(x) = f'(x) + k...
WB JEE 2018
Let for all x &gt; 0, $$f(x) = \mathop {\lim }\limits_{n \to \infty } n({x^{1/n}} - 1)$$, then
WB JEE 2017
$$\mathop {\lim }\limits_{x \to 0} {(\sin x)^{2\tan x}}$$ is equal to
WB JEE 2017
Let $$f(x) = \left\{ {\matrix{ {{{{x^p}} \over {{{(\sin x)}^q}}},} &amp; {if\,0 &lt; x \le {\pi \over 2}} \cr {... WB JEE 2017 If f'' (0) = k, k$$ \ne $$0, then the value of$$\mathop {\lim }\limits_{x \to 0} {{2f(x) - 3f(2x) + f(4x)} \over {{x^...
WB JEE 2017
Consider the non-constant differentiable function f one one variable which obeys the relation $${{f(x)} \over {f(y)}} = ... WB JEE 2017 The function f(x) = ax + b is strictly increasing for all real x if WB JEE 2011$$f(x) = \left\{ {\matrix{ {0,} & {x = 0} \cr {x - 3,} & {x > 0} \cr } } \right.$$The function f(x) is... WB JEE 2011 For the function$$f(x) = {e^{\cos x}}$$, Rolle's theorem is WB JEE 2011$$f(x) = \left\{ {\matrix{ {[x] + [ - x],} & {when\,x \ne 2} \cr {\lambda ,} & {when\,x = 0} \cr } } \right....
WB JEE 2011
If the function $$f(x) = \left\{ {\matrix{ {{{{x^2} - (A + 2)x + A} \over {x - 2}},} & {for\,x \ne 2} \cr {2,} &... WB JEE 2011$$\mathop {\lim }\limits_{x \to 0} {{\sin (\pi {{\sin }^2}x)} \over {{x^2}}} = $$WB JEE 2011 The value of$$\mathop {\lim }\limits_{x \to 1} {{x + {x^2} + ..... + {x^n} - n} \over {x - 1}}$$is WB JEE 2011 In which of the following functions, Rolle's theorem is applicable? WB JEE 2010$$\mathop {\lim }\limits_{x \to 0} {{\sin |x|} \over x}$$is equal to WB JEE 2010 The value of f(0) so that the function$$f(x) = {{1 - \cos (1 - \cos x)} \over {{x^4}}}$$is continuous everywhere is... WB JEE 2010 If$$y = (1 + x)(1 + {x^2})(1 + {x^4})\,.....\,(1 + {x^{2n}})$$, then the value of$${\left( {{{dy} \over {dx}}} \right)...
WB JEE 2010
If $$f(5) = 7$$ and $$f'(5) = 7$$, then $$\mathop {\lim }\limits_{x \to 5} {{x\,f(5) - 5f(x)} \over {x - 5}}$$ is given ...
WB JEE 2010
The value of $$\mathop {\lim }\limits_{x \to 0} {\left( {{{1 + 5{x^2}} \over {1 + 3{x^2}}}} \right)^{{1 \over {{x^2}}}}}... WB JEE 2010 The value of$$\mathop {\lim }\limits_{x \to 0} {{{{\sin }^2}x + \cos x - 1} \over {{x^2}}}$$is WB JEE 2010 The value of$$\mathop {\lim }\limits_{x \to 1} {{\sin ({e^{x - 1}} - 1)} \over {\log x}}$$is WB JEE 2009$$f(x) = x + |x|$$is continuous for WB JEE 2009 Let$$f(x) = {{\sqrt {x + 3} } \over {x + 1}}$$, then the value of$$\mathop {\lim }\limits_{x \to - 3 - 0} f(x)$$is... WB JEE 2009 A function f(x) is defined as follows for real x$$f(x) = \left\{ {\matrix{ {1 - {x^2}} & , & {for\,x 1} \cr } }...
WB JEE 2008
The $$\mathop {\lim }\limits_{x \to 2} {5 \over {\sqrt 2 - \sqrt x }}$$ is
WB JEE 2008
The value of the limit $$\mathop {\lim }\limits_{x \to 2} {{{e^{3x - 6}} - 1} \over {\sin (2 - x)}}$$ is
WB JEE 2008
Rolle's theorem is not applicable to the function $$f(x) = |x|$$ for $$- 2 \le x \le 2$$ because
WB JEE 2008
$$\mathop {\lim }\limits_{x \to {\pi \over 2}} {{{a^{\cot x}} - {a^{\cos x}}} \over {\cot x - \cos x}},a > 0$$
WB JEE 2008

## MCQ (More than One Correct Answer)

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$$\mathop {\lim }\limits_{n \to \infty } \left\{ {{{\sqrt n } \over {\sqrt {{n^3}} }} + {{\sqrt n } \over {\sqrt {{{(n +... WB JEE 2021 Let$$f(x) = {1 \over 3}x\sin x - (1 - \cos \,x)$$. The smallest positive integer k such that$$\mathop {\lim }\limits_{...
WB JEE 2020
Consider the function $$f(x) = {{{x^3}} \over 4} - \sin \pi x + 3$$
WB JEE 2019
Let $$f:[1,3] \to R$$ be a continuous function that is differentiable in (1, 3) an f'(x) = | f(x) |2 + 4 for all x$$\in... WB JEE 2019 Let f : R$$ \to $$R be twice continuously differentiable. Let f(0) = f(1) = f'(0) = 0. Then, WB JEE 2017 ## Subjective More If f(a) = 2, f'(a) = 1, g(a) =$$-$$1 and g'(a) = 2, find the value of$$\mathop {\lim }\limits_{x \to a} {{g(x)f(a) - g...
WB JEE 2010
Use the formula $$\mathop {\lim }\limits_{x \to 0} {{{a^x} - 1} \over x} = {\log _e}a$$, to compute $$\mathop {\lim }\li... WB JEE 2010 If N = n! (n$$\in$$N, n > 2), then find$$\mathop {\lim }\limits_{N \to \infty } \left[ {{{({{\log }_2}N)}^{ - 1}} + {...
WB JEE 2010

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