Question

The area bounded by the curves $$y = \ell n\,x,\,y = \ell n\left| x \right|,\,y = \left| {\ell n\,x} \right|$$       and $$y = \left| {\ell n\left| x \right|} \right|$$   is :

A. 4 sq. units  
B. 6 sq. units
C. 10 sq. units
D. None of these
Answer :   4 sq. units
Solution :
First we draw each curve as separate graph
Application of Integration mcq solution image
Clearly the bounded area is as shown in the following figure.
Application of Integration mcq solution image
Required area
$$\eqalign{ & = 4\int\limits_0^1 {\left( { - \ell n\,x} \right)} dx \cr & = - 4\left[ {x\,\ell n\,x - x} \right]_0^1 \cr & = 4{\text{ sq}}{\text{. units}} \cr} $$

Releted MCQ Question on
Calculus >> Application of Integration

Releted Question 1

The area bounded by the curves $$y = f\left( x \right),$$   the $$x$$-axis and the ordinates $$x = 1$$  and $$x = b$$  is $$\left( {b - 1} \right)\sin \left( {3b + 4} \right).$$     Then $$f\left( x \right)$$  is-

A. $$\left( {x - 1} \right)\cos \left( {3x + 4} \right)$$
B. $$\sin \,\left( {3x + 4} \right)$$
C. $$\sin \,\left( {3x + 4} \right) + 3\left( {x - 1} \right)\cos \left( {3x + 4} \right)$$
D. none of these
Releted Question 2

The area bounded by the curves $$y = \left| x \right| - 1$$   and $$y = - \left| x \right| + 1$$   is-

A. $$1$$
B. $$2$$
C. $$2\sqrt 2 $$
D. $$4$$
Releted Question 3

The area bounded by the curves $$y = \sqrt x ,\,2y + 3 = x$$    and $$x$$-axis in the 1st quadrant is-

A. $$9$$
B. $$\frac{{27}}{4}$$
C. $$36$$
D. $$18$$
Releted Question 4

The area enclosed between the curves $$y = a{x^2}$$   and $$x = a{y^2}\left( {a > 0} \right)$$    is 1 sq. unit, then the value of $$a$$ is-

A. $$\frac{1}{{\sqrt 3 }}$$
B. $$\frac{1}{2}$$
C. $$1$$
D. $$\frac{1}{3}$$

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