Class CBSE Class 12 Mathematics Applications of Integrals Q #1847
COMPETENCY BASED
APPLY
1 Marks 2026 AISSCE(Board Exam) MCQ SINGLE
The area bounded by the curve $y = x|x|$, x-axis and the ordinates $x = -1$ and $x = 1$ is given by
(A)
(B) $1/3$
(C) $2/3$
(D) $4/3$
Correct Answer: C

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Detailed Solution

Step 1: Define the function

The function is given by $y = x|x|$. Based on the definition of the absolute value function, we can split this into two cases: $$y = \begin{cases} x^2, & \text{if } x \ge 0 \\ -x^2, & \text{if } x < 0 \end{cases}$$

Step 2: Set up the integral

The area $A$ bounded by the curve, the x-axis, and the ordinates $x = -1$ and $x = 1$ is given by the definite integral: $$A = \int_{-1}^{1} |x|x| | dx$$ Since we are looking for the area, we integrate the absolute value of the function: $$A = \int_{-1}^{0} | -x^2 | dx + \int_{0}^{1} | x^2 | dx = \int_{-1}^{0} x^2 dx + \int_{0}^{1} x^2 dx$$

Step 3: Evaluate the integrals

Calculate the two integrals: $$\int_{-1}^{0} x^2 dx = \left[ \frac{x^3}{3} \right]_{-1}^{0} = 0 - \left( -\frac{1}{3} \right) = \frac{1}{3}$$ $$\int_{0}^{1} x^2 dx = \left[ \frac{x^3}{3} \right]_{0}^{1} = \frac{1}{3} - 0 = \frac{1}{3}$$

Step 4: Sum the areas

Total Area $A = \frac{1}{3} + \frac{1}{3} = \frac{2}{3}$ square units.

Final Answer: 2/3

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must apply the definition of the modulus function to split the integral and then perform definite integration.
Knowledge Dimension: PROCEDURAL
Justification: The problem requires a step-by-step algorithmic approach to handle piecewise functions within a definite integral.
Syllabus Audit: In the context of CBSE Class 12, this is classified as COMPETENCY. It tests the student's ability to interpret geometric area through calculus, specifically handling absolute values in integration, which is a core competency in the 'Applications of Integrals' unit.