Definite Integration – JEE Main Previous Year Question with Solutions

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Q. $\int_{0}^{\pi}[\cot x] d x,$ where $[.]$ denotes the greatest integer function, is equal to –

(1) –1 $(2)-\frac{\pi}{2}$

(3) $\frac{\pi}{2}$

(4) 1

[AIEEE-2009]

Sol. (2) Q. Let p(x) be a function defined on R such that p'(x) = p'(1 – x), for all x $\in$0, 1], p(0) = 1 and p(1) = 41. Then $\int_{0}^{1}$ p(x) dx equals :-

(1) $\sqrt{41}$

(2) 21

(3) 41

(4) 42

[AIEEE-2010]

Sol. (2) Q. The value of $\int_{0}^{1} \frac{8 \log (1+x)}{1+x^{2}} d x$ is :-

(1) $\frac{\pi}{2} \log 2$

(2) $\log 2$

(3) $\pi \log 2$

(4) $\frac{\pi}{8} \log 2$

[AIEEE-2011]

Sol. (3) Q. Let [.] denote the greatest integet function then the value of $\int_{0}^{1.5} \mathrm{x}\left[\mathrm{x}^{2}\right] \mathrm{dx}$ is :-

( 1)$\frac{5}{4}$ (2) 0 (3) $\frac{3}{2}$ (4) $\frac{3}{4}$

[AIEEE-2011]

Sol. (4) Q. If $\mathrm{g}(\mathrm{x})=\int_{0}^{\mathrm{x}} \cos 4 \mathrm{t} \mathrm{dt},$ then $\mathrm{g}(\mathrm{x}+\pi)$ equals :

(1) $\mathrm{g}(\mathrm{X}) \cdot \mathrm{g}(\pi)$

(2) $\frac{\mathrm{g}(\mathrm{x})}{\mathrm{g}(\pi)}$

(3) $\mathrm{g}(\mathrm{x})+\mathrm{g}(\pi)$

(4) $\mathrm{g}(\mathrm{x})-\mathrm{g}(\pi)$

[AIEEE-2012]

Sol. (3,4) Q. Statement-I : The value of the integral $\int_{\pi / 6}^{\pi / 3} \frac{\mathrm{dx}}{1+\sqrt{\tan \mathrm{x}}}$ is equal to $\frac{\pi}{6}$

Statement-II : $\int_{a}^{b} f(x) d x-\int_{a}^{b} f(a+b-x) d x$

(1) Statement-I is true, Statement-II is true; Statement-II is a correct explanation for Statement- I.

(2) Statement-I is true, Statement-II is true; Statement-II is not a correct explanation for Statement-I.

(3) Statement-I is true, Statement-II is false.

(4) Statement-I is false, Statement-II is true.

[JEE-MAIN-2013]

Sol. (4)  Q. The integral $\int_{0}^{\pi} \sqrt{1+4 \sin ^{2} \frac{x}{2}-4 \sin \frac{x}{2}} d x$ equals :

(1) $\pi-4$

(2) $\frac{2 \pi}{3}-4-4 \sqrt{3}$

(3) $4 \sqrt{3}-4$

(4) $4 \sqrt{3}-4-\frac{\pi}{3}$

[JEE-MAIN-2014]

Sol. (4) Q. The integral $\int_{2}^{4} \frac{\log x^{2}}{\log x^{2}+\log \left(36-12 x+x^{2}\right)} d x$ is equal to :

(1) 1 (2) 6 (3) 2 (4) 4

[JEE-MAIN-2015]

Sol. (1) Q. The integral $\int_{\frac{\pi}{4}}^{\frac{3 \pi}{4}} \frac{\mathrm{dx}}{1+\cos x}$ is equal to :-

(1) –1 (2) –2 (3) 2 (4) 4

[JEE-MAIN-2017]

Sol. (3)  Q. The value of $\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}} \frac{\sin ^{2} x}{1+2^{x}} d x$ is :

( 1)$\frac{\pi}{2}$

(2) $4 \pi$

(3) $\frac{\pi}{4}$

(4) $\frac{\pi}{8}$

[JEE-MAIN-2018]

Sol. (3)  