CBSE Class 12 Applied Mathematics · Free MCQs, Solved Examples & Case Studies
Unit 3 carries 15 marks in the CBSE board exam — the second-highest weightage unit. Everything you need to master it: 6 interactive MCQs with instant feedback, 6 short-answer and 5 long-answer solved examples, and 3 board-pattern case studies. Covering Differentiation, Applications of Derivatives, Integrals, Applications of Integrals, and Differential Equations. All content is aligned to the CBSE 2026–27 syllabus and board exam pattern. Once you've attempted the questions and self-assessed your answers, tap ✨ My Report to see your personalised performance breakdown.
This page covers all topics in Unit 3 of CBSE Class 12 Applied Mathematics — carrying 15 marks in the board exam, making it the second-highest weightage unit. You'll find 6 MCQs with solutions, 6 short-answer and 5 long-answer questions with complete step-by-step workings, and 3 case studies based on Manufacturing, Water Tanks, and E-commerce. Topics include Differentiation, Applications of Derivatives (maxima, minima, marginal cost), Definite and Indefinite Integrals, Applications of Integrals (consumer surplus, area), and Differential Equations. All content is aligned to the CBSE 2026–27 syllabus.
Five topics examined across MCQs, short answers, long answers, and case studies. Memorise the formulas below — they appear in multiple question types every year.
Higher-order derivatives and their applications
Power rule: \(\dfrac{d}{dx}(x^n) = nx^{n-1}\) Chain rule: \(\dfrac{dy}{dx} = \dfrac{dy}{du}\cdot\dfrac{du}{dx}\)Rate of change, maxima–minima, marginal cost & revenue
\(MC = \dfrac{dC}{dx},\quad MR = \dfrac{dR}{dx}\) Max/min: \(f'(x)=0\); check sign of \(f''(x)\)Indefinite, definite, substitution, partial fractions, by parts
\(\displaystyle\int x^n\,dx = \dfrac{x^{n+1}}{n+1} + C\) \(\displaystyle\int_a^b f(x)\,dx = F(b)-F(a)\)Consumer & producer surplus, area under curves
\(CS = \displaystyle\int_0^{x_0} D(x)\,dx - p_0 x_0\) \(PS = p_0 x_0 - \displaystyle\int_0^{x_0} S(x)\,dx\)Order, degree, formation and solutions
Order = highest derivative present Degree = power of that derivative (if polynomial)Integration & Its Applications — Series (7 Videos)
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Select your answer, then click Show Answer to check and reveal the full explanation. All questions are based on CBSE past papers and board exam pattern.
All 8 units in one print-ready PDF — formulas, tips & common mistakes
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🤖 Get AI Q-Bank →2-mark and 3-mark questions with complete working. Click Show Solution to reveal each answer.
All Unit 3 formulas — and all 8 units — in one organised, printable PDF. Chapter-wise layout, exam tips, common mistakes noted alongside every formula.
All 8 units in one print-ready PDF — formulas, tips & common mistakes
📐 Get Formula Deck →Adaptive practice that targets weak areas, instant feedback & timed board exam simulation —
🤖 Get AI Q-Bank →4-mark and 5-mark practice questions with complete working. Click Show Solution to reveal each answer.
All 8 units in one print-ready PDF — formulas, tips & common mistakes
📐 Get Formula Deck →Adaptive practice, instant feedback & timed board exam simulation —
🤖 Get AI Q-Bank →Board-pattern 4-mark case studies. Read the context carefully, then click Show Solution under each part.
Find the marginal cost function \(dC/dx\).
Find the value of \(x\) for which marginal cost is minimum.
Find the minimum marginal cost.
If \(R(x) = 200x-2x^2\), find the production level that maximises profit.
Find the rate of change of height at \(t = 10\) minutes.
Calculate the height after 20 minutes.
Find the volume of water filled in the first 10 minutes.
Find the rate of change of volume at \(t = 15\) minutes.
Find the rate of change of sales with respect to time.
Find the time at which the sales rate is maximum.
Calculate the total sales revenue from hour 2 to hour 6.
Find when the sales revenue is exactly ₹100 thousand.
All formulas for all 8 units — organised, printable PDF for quick revision
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🤖 Get AI Q-Bank →Mistakes students make in the board exam — and how to avoid them.
Finding where \(f'(x)=0\) is only half the answer. You must then compute \(f''(x)\) at that point and write explicitly: "Since \(f''(x) < 0\), this is a maximum" or "Since \(f''(x) > 0\), this is a minimum." Skipping this verification step costs 1 mark in almost every long-answer question on maxima and minima.
🔒 More exam tips for Unit 3 — integration step-writing, consumer surplus setup, differential equations conclusion format, and MCQ shortcuts — are all in the AI Question Bank.
🤖 Get All Tips in AI Q-Bank →Questions students frequently ask about Unit 3 — topics, formulas, and exam strategy.
Free study material for every unit of the CBSE Class 12 Applied Maths syllabus.
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