META DESCRIPTIONWBCHSE Class XII Semester III Part 35 — Final Examination Performance Booster with fresh Physics, Chemistry, Biological Science, Mathematics, English and Bengali questions, advanced numericals, case studies, HOTS, rapid revision and score-improvement strategies.KEYWORDSWBCHSE Class 12 Semester IIIWBCHSE Semester 3 Model QuestionsClass 12 Question BankWBCHSE Final RevisionWBCHSE Physics PracticeWBCHSE Chemistry PracticeWBCHSE Biological ScienceWBCHSE MathematicsWBCHSE EnglishWBCHSE BengaliClass 12 Mock TestClass 12 Numerical PracticeClass 12 Case StudyClass 12 HOTSClass 12 Final PreparationWBCHSE Exam StrategyClass 12 Score ImprovementClass 12 Answer WritingClass 12 Revision PlanBoard Examination PreparationHASHTAGS#WBCHSE#Class12#Semester3#QuestionBank#ModelQuestions#FinalRevision#Physics#Chemistry#BiologicalScience#Mathematics#English#Bengali#MockTest#ExamPreparation#HOTS#CaseStudy#NumericalPractice#AnswerWriting#ScoreImprovement#BoardExam#RevisionStrategy#StudentSuccess#StudyPlan

Writing

WBCHSE CLASS XII SEMESTER III

Subject-Wise Model Question Bank — Part 35

FINAL EXAMINATION PERFORMANCE BOOSTER

Fresh MCQs • Advanced Numericals • Case Studies • HOTS • Assertion–Reason • Data Interpretation • Answer Writing • Rapid Recall • Final Mock Strategy

1. INTRODUCTION

Welcome to another important stage of your Semester III preparation.

By now, the objective should no longer be simply:

“How much more can I study?”

The better question is:

“How accurately can I reproduce what I already know in the examination?”

This part therefore focuses on:

Accuracy

Speed

Application

Multi-step reasoning

Numerical presentation

Case-study interpretation

Long-answer writing

Mistake reduction

Final revision

The Final Performance Formula

Knowledge + Practice + Accuracy + Time Management = Examination Performance

PART A — PHYSICS

2. PHYSICS ADVANCED PRACTICE

Section A — Conceptual Challenge

Q1.

Two identical capacitors are first connected in parallel and then in series. In which arrangement is the equivalent capacitance larger?

Answer: Parallel arrangement.

For two identical capacitors C:

Parallel:

[ C_p=2C ]

Series:

[ C_s=\frac{C}{2} ]

Therefore,

[ \boxed{C_p>C_s} ]

Q2.

A wire is stretched so that its length becomes twice its original length, while its volume remains constant. What happens to its resistance?

Since volume remains constant:

[ A'L'=AL ]

If

[ L'=2L ]

then

[ A'=\frac A2 ]

Since

[ R=\rho\frac LA ]

we get

[ R'=\rho\frac{2L}{A/2}=4R ]

Therefore,

[ \boxed{R'=4R} ]

Q3.

Why does a charged particle moving in a magnetic field not necessarily gain kinetic energy?

Because the magnetic force is perpendicular to the instantaneous velocity.

Therefore,

[ P=\vec F\cdot\vec v=0 ]

Hence magnetic force does no work.

Q4.

A current-carrying conductor is placed parallel to a uniform magnetic field. What is the magnetic force?

[ F=BIL\sin\theta ]

For parallel orientation,

[ \theta=0^\circ ]

Therefore,

[ \boxed{F=0} ]

Q5.

What determines the direction of induced current?

Lenz's law determines the direction.

The induced current opposes the change in magnetic flux responsible for producing it.

Section B — Fresh Numerical Marathon

Q6.

A 4,\mu F capacitor is connected to a 25,V source. Find the energy stored.

[ U=\frac12CV^2 ]

[ U=\frac12(4\times10^{-6})(25)^2 ]

[ U=2\times10^{-6}\times625 ]

[ \boxed{U=1.25\times10^{-3},J} ]

Q7.

A 12,\Omega resistor is connected to a 24,V source. Find the power consumed.

[ P=\frac{V^2}{R} ]

[ P=\frac{24^2}{12} ]

[ P=48,W ]

[ \boxed{P=48,W} ]

Q8.

A current of 1.5,A flows through a 10,\Omega resistor for 2 minutes. Find the heat produced.

[ H=I^2Rt ]

[ H=(1.5)^2(10)(120) ]

[ H=2700,J ]

[ \boxed{H=2.7,kJ} ]

Q9.

A charge of 5\times10^{-6},C moves with velocity 2\times10^5,m/s perpendicular to a magnetic field of 0.4,T. Find the magnetic force.

[ F=qvB ]

[ F=(5\times10^{-6})(2\times10^5)(0.4) ]

[ \boxed{F=0.4,N} ]

Q10.

The magnetic flux through a coil of 100 turns changes by 2.5\times10^{-3},Wb in 0.05,s. Find the average induced emf.

[ E=N\frac{\Delta\Phi}{\Delta t} ]

[ E=100\frac{2.5\times10^{-3}}{0.05} ]

[ \boxed{E=5,V} ]

Section C — Assertion–Reason

Q11.

Assertion: The electric field inside an ideal conductor in electrostatic equilibrium is zero.

Reason: Free charges redistribute themselves until the internal electric field becomes zero.

Answer: Both are correct and the reason correctly explains the assertion.

Q12.

Assertion: Increasing the resistance of a circuit can reduce current when the applied voltage remains constant.

Reason: According to Ohm's law,

[ I=\frac VR ]

Answer: Both are correct and the reason correctly explains the assertion.

Section D — Data Interpretation

A student records the following values for a resistor:

Voltage (V)

Current (A)

2

0.5

4

1.0

6

1.5

8

2.0

Q13.

Is the resistor approximately ohmic?

Answer: Yes.

Q14.

Calculate resistance using the first reading.

[ R=\frac VI=\frac{2}{0.5} ]

[ \boxed{R=4,\Omega} ]

Q15.

What should the V-I graph look like?

Answer: A straight line passing through the origin.

Physics Revision Checklist

Before the examination, revise:

☐ Electrostatic formulas

☐ Capacitor combinations

☐ Current electricity

☐ Resistance and power

☐ Magnetic force

☐ Magnetic field concepts

☐ Electromagnetic induction

☐ Lenz's law

☐ Numerical units

☐ Graph interpretation

PART B — CHEMISTRY

3. CHEMISTRY ADVANCED PRACTICE

Electrochemistry

Q16.

What is the relationship between cell potential and Gibbs energy?

[ \boxed{\Delta G=-nFE} ]

Q17.

If E^\circ_{cell} is positive, what can generally be concluded under standard conditions?

The cell reaction is thermodynamically spontaneous.

Q18.

Why does molar conductivity generally increase on dilution?

Because ionic interactions decrease and ion mobility generally increases.

Chemical Kinetics

Q19.

A first-order reaction has a rate constant of 0.01155,min^{-1}. Find its half-life.

[ t_{1/2}=\frac{0.693}{k} ]

[ t_{1/2}=\frac{0.693}{0.01155} ]

[ \boxed{60,min} ]

Q20.

If the rate constant of a first-order reaction doubles, what happens to its half-life?

Since

[ t_{1/2}\propto\frac1k ]

the half-life becomes half.

Q21.

What does a catalyst do to activation energy?

It provides an alternative pathway with lower activation energy.

Coordination Chemistry

Q22.

What is a monodentate ligand?

A ligand that coordinates to the central metal through one donor atom.

Q23.

Give one example of a monodentate ligand.

[ \boxed{NH_3} ]

Q24.

What is chelation?

The formation of a ring structure when a multidentate ligand binds to a central metal ion through multiple donor atoms.

Chemistry Case Study

A galvanic cell operates spontaneously under standard conditions.

Q25.

What is the sign of E^\circ_{cell}?

[ \boxed{Positive} ]

Q26.

What is the sign of \Delta G^\circ?

Since

[ \Delta G^\circ=-nFE^\circ ]

[ \boxed{\Delta G^\circ<0} ]

Q27.

Is the reaction thermodynamically favourable?

Answer: Yes, under standard conditions.

Chemistry Numerical

Q28.

For a cell reaction involving 3 electrons, E^\circ=0.40,V, and F=96500,C,mol^{-1}, calculate \Delta G^\circ.

[ \Delta G^\circ=-nFE^\circ ]

[ =-3(96500)(0.40) ]

[ \boxed{\Delta G^\circ=-115800,J,mol^{-1}} ]

or

[ \boxed{-115.8,kJ,mol^{-1}} ]

Q29.

A first-order reaction has k=0.03465,min^{-1}. Calculate its half-life.

[ t_{1/2}=\frac{0.693}{0.03465} ]

[ \boxed{20,min} ]

Chemistry Assertion–Reason

Q30.

Assertion: The half-life of a first-order reaction is independent of initial concentration.

Reason:

[ t_{1/2}=\frac{0.693}{k} ]

Answer: Both statements are correct and the reason explains the assertion.

Chemistry Final Checklist

☐ Nernst equation

☐ Cell potential

☐ Gibbs energy

☐ Conductivity

☐ Molar conductivity

☐ First-order kinetics

☐ Half-life

☐ Activation energy

☐ Ligands

☐ Coordination number

☐ Chelation

☐ Sign conventions

PART C — BIOLOGICAL SCIENCE

4. BIOLOGY HIGH-YIELD CHALLENGE

Molecular Biology

Q31.

Why is DNA suitable as genetic material?

Answer:

DNA is chemically stable, capable of replication, capable of storing genetic information and capable of undergoing changes that can contribute to variation.

Q32.

What is the function of DNA polymerase during replication?

Answer:

It catalyses the synthesis of the new DNA strand using the template strand.

Q33.

What is the role of RNA polymerase?

Answer:

It catalyses transcription, synthesising RNA from a DNA template.

Q34.

What is the difference between a codon and an anticodon?

Answer:

Codon: Three-nucleotide sequence on mRNA.

Anticodon: Complementary three-nucleotide sequence on tRNA.

Q35.

What is the significance of the degeneracy of the genetic code?

Answer:

More than one codon can specify the same amino acid. Therefore, some nucleotide substitutions may not alter the amino acid sequence.

Case Study — Mutation

A gene undergoes a single nucleotide substitution.

Q36.

Can the mutation be silent?

Answer: Yes.

Q37.

Can it change an amino acid?

Answer: Yes.

Q38.

Can some mutations introduce a premature stop signal?

Answer: Yes. Such mutations can produce a shortened protein.

Evolution Challenge

Q39.

Why does natural selection act on phenotypes?

Answer:

Selection directly affects observable characteristics associated with survival and reproduction, although these characteristics may have a genetic basis.

Q40.

Why is evolution considered a population-level process?

Answer:

Evolution involves changes in the genetic composition of populations across generations.

Diagram Challenge

Draw and label:

DNA replication fork

Transcription unit

tRNA

Translation

DNA double helix

Biology Answer-Writing Rule

For a five-mark question:

Definition → Mechanism → Important steps → Diagram/example → Significance

PART D — MATHEMATICS

5. MATHEMATICS ADVANCED CHALLENGE

Q41.

Differentiate:

[ y=x^5-4x^3+7x ]

Answer:

[ \boxed{\frac{dy}{dx}=5x^4-12x^2+7} ]

Q42.

Evaluate:

[ \int(4x^3-6x),dx ]

[ \boxed{x^4-3x^2+C} ]

Q43.

Evaluate:

[ \int_0^2 x,dx ]

[ =\left[\frac{x^2}{2}\right]_0^2 ]

[ \boxed{2} ]

Q44.

Find the magnitude of:

[ \vec A=2\hat i-3\hat j+6\hat k ]

[ |\vec A|=\sqrt{4+9+36} ]

[ \boxed{7} ]

Q45.

Find the dot product:

[ (\hat i+3\hat j-2\hat k)\cdot (2\hat i-\hat j+4\hat k) ]

[ =2-3-8 ]

[ \boxed{-9} ]

Q46.

Are the vectors

[ 2\hat i-\hat j+3\hat k ]

and

[ 4\hat i-2\hat j+6\hat k ]

parallel?

Answer: Yes.

The second vector is twice the first.

Q47.

If

[ P(A)=0.42 ]

find P(A').

[ P(A')=1-0.42 ]

[ \boxed{0.58} ]

Q48.

A fair coin is tossed three times. What is the probability of obtaining exactly two heads?

Number of total outcomes:

[ 2^3=8 ]

Favourable outcomes:

[ HHT,\ HTH,\ THH ]

Therefore,

[ P=\frac38 ]

[ \boxed{\frac38} ]

Q49.

Find the derivative:

[ y=x^2e^x ]

Using the product rule:

[ \frac{dy}{dx}

2xe^x+x^2e^x ]

Therefore,

[ \boxed{\frac{dy}{dx}=e^x(x^2+2x)} ]

Q50.

Solve:

[ \frac{dy}{dx}=2x+3 ]

Integrating:

[ y=x^2+3x+C ]

[ \boxed{y=x^2+3x+C} ]

Q51.

For two vectors \vec A and \vec B, write the formula for the angle between them.

[ \boxed{ \cos\theta= \frac{\vec A\cdot\vec B}{|\vec A||\vec B|} } ]

Q52.

What is the condition for two vectors to be parallel?

Their cross product is zero:

[ \boxed{\vec A\times\vec B=0} ]

for non-zero parallel vectors.

Q53.

What is the probability of an event whose occurrence is guaranteed?

[ \boxed1 ]

Q54.

Find:

[ \frac{d}{dx}(\sin^2x) ]

Using the chain rule:

[ \boxed{2\sin x\cos x} ]

or

[ \boxed{\sin2x} ]

Q55.

Find:

[ \int\cos x,dx ]

[ \boxed{\sin x+C} ]

Mathematics Error Hunt

Before submitting a solution, check:

Check 1

Did I copy the question correctly?

Check 2

Did I use the appropriate formula?

Check 3

Did I make an algebraic/sign mistake?

Check 4

Did I apply the limits correctly?

Check 5

Did I write the final answer clearly?

PART E — ENGLISH

6. ENGLISH FINAL ANSWER-WRITING TEST

Reading

Read the passage:

A good examination strategy is not based entirely on speed. Accuracy is equally important. A student who answers rapidly but makes frequent mistakes may score less than a student who works carefully and checks important answers. Effective preparation therefore requires both knowledge and control. The best strategy is to practise under realistic conditions and learn from every mistake.

Questions

Q56.

What two qualities are highlighted in the passage?

Answer: Speed and accuracy.

Q57.

Why can excessive speed be harmful?

Answer: It may increase the number of mistakes.

Q58.

What does effective preparation require?

Answer: Knowledge and control.

Q59.

What is the suggested method of preparation?

Answer: Practising under realistic conditions and learning from mistakes.

Q60.

Give a suitable title.

Answer:

“Accuracy and Strategy in Examinations”

Summary Practice

Write a concise summary of the passage.

Remember:

Do not copy every sentence.

Identify:

Central idea + supporting ideas + conclusion

Article Writing

Topic:

“How Students Can Reduce Examination Stress”

Include:

Causes of stress

Importance of preparation

Sleep

Exercise

Time management

Positive thinking

Family support

Conclusion

Report Writing

Topic:

“A Career Guidance Programme in Your School”

Include:

Heading

Date/place

Organiser

Speakers

Main topics discussed

Student participation

Conclusion

Formal Letter

Topic:

Write a letter to the Head of your institution requesting additional revision classes before the examination.

Remember:

Formal writing should be:

Polite + precise + organised + purposeful

Literature Practice

Prepare answers on:

Character development

Central theme

Conflict

Symbolism

Setting

Important incident

Author's message

Title significance

Character comparison

Personal interpretation supported by the text

Literature Formula

Point → Reference → Explanation → Significance

PART F — বাংলা

7. বাংলা চূড়ান্ত অনুশীলন

গদ্য

প্রশ্ন ৬১

গদ্যের প্রধান চরিত্রের বৈশিষ্ট্য আলোচনা করো।

উত্তরের কাঠামো:

চরিত্রের পরিচয়

প্রধান বৈশিষ্ট্য

ঘটনায় তার ভূমিকা

আচরণের কারণ

লেখকের দৃষ্টিভঙ্গি

উপসংহার

প্রশ্ন ৬২

গদ্যের একটি গুরুত্বপূর্ণ ঘটনার তাৎপর্য ব্যাখ্যা করো।

উত্তর লেখার পদ্ধতি:

ঘটনা → কারণ → প্রভাব → চরিত্র/বিষয়ের সঙ্গে সম্পর্ক → তাৎপর্য

পদ্য

প্রশ্ন ৬৩

কবিতার মূলভাব নিজের ভাষায় লেখো।

প্রশ্ন ৬৪

কবিতায় প্রকৃতি বা মানুষের যে চিত্র ফুটে উঠেছে তা আলোচনা করো।

প্রশ্ন ৬৫

কবিতার একটি গুরুত্বপূর্ণ প্রতীকের তাৎপর্য ব্যাখ্যা করো।

ব্যাকরণ

প্রশ্ন ৬৬

শুদ্ধ বানান লিখো:

দায়িত্ব

সৌন্দর্য

স্বাধীনতা

প্রয়োজন

অভিজ্ঞতা

প্রশ্ন ৬৭

বাক্যের অর্থ অপরিবর্তিত রেখে গঠন পরিবর্তন করো।

এ ধরনের প্রশ্নে প্রথমে:

কর্তা + ক্রিয়া + কর্ম

চিহ্নিত করে তারপর বাক্যের কাঠামো পরিবর্তন করতে হবে।

রচনা

প্রশ্ন ৬৮

“পরিবেশ রক্ষায় ছাত্রসমাজের ভূমিকা”

আলোচনার পয়েন্ট:

পরিবেশের গুরুত্ব

দূষণের সমস্যা

ছাত্রদের সচেতনতা

বৃক্ষরোপণ

প্লাস্টিক বর্জন

জল সংরক্ষণ

সামাজিক প্রচার

উপসংহার

8. 6-SUBJECT MINI MOCK

Physics

Q69.

A 5,\mu F capacitor is connected to 20,V. Find its charge.

Answer:

[ Q=CV ]

[ \boxed{100,\mu C} ]

Chemistry

Q70.

A first-order reaction has k=0.0693,min^{-1}. Find its half-life.

[ t_{1/2}=\frac{0.693}{0.0693} ]

[ \boxed{10,min} ]

Biology

Q71.

What carries amino acids to the ribosome?

Answer: tRNA.

Mathematics

Q72.

Find:

[ \int_0^1 3x^2,dx ]

[ =[x^3]_0^1 ]

[ \boxed1 ]

English

Q73.

What is the main purpose of a formal letter?

Answer: To communicate a specific matter formally and respectfully to an appropriate recipient.

Bengali

Q74.

রচনার শেষ অংশকে কী বলা হয়?

Answer: উপসংহার।

9. FINAL 15-MINUTE REVISION SYSTEM

When only 15 minutes are available, do not open a completely new chapter.

Use:

5 minutes

Formula and definition recall.

5 minutes

Review mistakes from the error notebook.

5 minutes

Close the book and recall the important points mentally.

This is much more useful than randomly reading pages.

10. THE “LAST MISTAKE” METHOD

After every mock test, select the five most important mistakes.

For each mistake write:

What happened?

Why did it happen?

What is the correct method?

How will I prevent it?

Then retest those five questions after 24–48 hours.

11. FINAL SCORECARD

Area

Excellent

Needs Work

Concept clarity

☐

☐

Formula recall

☐

☐

Numerical accuracy

☐

☐

Diagram skill

☐

☐

Reading comprehension

☐

☐

Long-answer writing

☐

☐

Bengali writing

☐

☐

Time management

☐

☐

Mistake correction

☐

☐

Confidence

☐

☐

Do not be disappointed if several boxes fall under Needs Work.

Those boxes tell you exactly where your next improvement should come from.

12. 7-DAY FINAL PERFORMANCE PLAN

Day 1

Physics formulas + numerical practice.

Day 2

Chemistry formulas + electrochemistry + kinetics.

Day 3

Biology diagrams + molecular biology + evolution.

Day 4

Mathematics timed practice.

Day 5

English + Bengali writing practice.

Day 6

Full mixed mock examination.

Day 7

Error correction + light revision.

13. EXAMINATION-DAY GOLDEN RULES

Rule 1

Read before answering.

Rule 2

Do not spend too much time on one difficult question.

Rule 3

Show important steps in numerical problems.

Rule 4

Keep diagrams clean and labelled.

Rule 5

Underline important terms when appropriate.

Rule 6

Leave enough time for checking.

Rule 7

Never change an answer without a valid reason.

Rule 8

Keep calm after encountering a difficult question.

Remember:

One difficult question does not define the entire examination.

14. MESSAGE TO STUDENTS

You may not feel completely ready.

That is normal.

Very few students reach the final stage and honestly think:

“I know absolutely everything.”

Preparation is not about knowing everything.

It is about knowing enough, practising enough, correcting enough mistakes and remaining calm enough to use what you know.

If you make a mistake today, that is not necessarily bad news.

A mistake discovered before the examination can become a mark saved during the examination.

So keep practising.

Keep correcting.

Keep moving forward.

Remember:

One question at a time.

One mistake at a time.

One improvement at a time.

You are still moving forward.

15. MESSAGE TO PARENTS

The final preparation period can be emotionally demanding.

Instead of asking only:

“How many marks did you get?”

also ask:

“What improved?”

and:

“Which mistake are you going to correct?”

Praise disciplined effort.

Encourage sufficient sleep.

Help maintain a calm study environment.

And most importantly:

Do not let one low mock-test score become a student's identity.

A mock test is a diagnostic tool—not a final judgment.

16. MASTER FORMULA

For Science

Concept → Formula → Application → Unit → Check

For Mathematics

Understand → Solve → Verify

For Biology

Definition → Mechanism → Diagram → Function

For English

Understand → Organise → Express → Proofread

For Bengali

মূলভাব → ব্যাখ্যা → বিশ্লেষণ → উপসংহার

17. FINAL REVISION MANTRA

Read less randomly.

Revise more intelligently.

Practise under time pressure.

Analyse every mistake.

Repeat difficult questions.

Protect your confidence.

DISCLAIMER

This is an independent educational practice resource containing original model questions, sample answers, revision methods and examination strategies.

It is not an official WBCHSE question paper, official suggestion, prediction, leaked paper or guarantee of examination questions.

Students should verify the latest official WBCHSE syllabus, examination pattern, marks distribution, prescribed textbooks and instructions from their school and the West Bengal Council of Higher Secondary Education.

Use this material according to the syllabus applicable to your examination.

META DESCRIPTION

WBCHSE Class XII Semester III Part 35 — Final Examination Performance Booster with fresh Physics, Chemistry, Biological Science, Mathematics, English and Bengali questions, advanced numericals, case studies, HOTS, rapid revision and score-improvement strategies.

KEYWORDS

WBCHSE Class 12 Semester III

WBCHSE Semester 3 Model Questions

Class 12 Question Bank

WBCHSE Final Revision

WBCHSE Physics Practice

WBCHSE Chemistry Practice

WBCHSE Biological Science

WBCHSE Mathematics

WBCHSE English

WBCHSE Bengali

Class 12 Mock Test

Class 12 Numerical Practice

Class 12 Case Study

Class 12 HOTS

Class 12 Final Preparation

WBCHSE Exam Strategy

Class 12 Score Improvement

Class 12 Answer Writing

Class 12 Revision Plan

Board Examination Preparation

HASHTAGS

#WBCHSE

#Class12

#Semester3

#QuestionBank

#ModelQuestions

#FinalRevision

#Physics

#Chemistry

#BiologicalScience

#Mathematics

#English

#Bengali

#MockTest

#ExamPreparation

#HOTS

#CaseStudy

#NumericalPractice

#AnswerWriting

#ScoreImprovement

#BoardExam

#RevisionStrategy

#StudentSuccess

#StudyPlan

Part 35 strengthens the final performance stage with fresh questions, new numerical values, data interpretation, writing practice, and a practical 7-day revision cycle.

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