META DESCRIPTIONWBCHSE Class XII Semester III Model Question Bank Part 26 featuring complete subject-wise mock practice in Physics, Chemistry, Biological Science, Mathematics, English and Bengali, with advanced numericals, case studies, HOTS, writing practice, examination simulation and a 30-day revision blueprint.KEYWORDSWBCHSE Class 12 Semester 3WBCHSE Class XII Semester IIIWBCHSE Model Question BankWBCHSE Practice QuestionsWBCHSE Mock TestClass 12 Physics QuestionsClass 12 Chemistry QuestionsClass 12 Biological Science QuestionsClass 12 Mathematics QuestionsClass 12 English QuestionsClass 12 Bengali QuestionsWBCHSE Numerical QuestionsWBCHSE HOTS QuestionsWBCHSE Case Study QuestionsWBCHSE Revision StrategyClass 12 Exam PreparationHigher Secondary Preparation30 Day Revision PlanMock Test StrategyMistake AnalysisScore ImprovementExam Time ManagementStudent Self AssessmentClass 12 Study PlanHASHTAGS#WBCHSE#Class12#Semester3#WBCHSEQuestionBank#ModelQuestions#MockTest#Physics#Chemistry#BiologicalScience#Mathematics#English#Bengali#Numericals#HOTS#CaseStudy#Revision#ExamPreparation#HigherSecondary#StudyPlan#30DayRevision#TimeManagement#MistakeAnalysis#ScoreImprovement#StudentSuccess#PracticeMakesProgressEND OF PART 26NEXT PARTPart 27 — Advanced Final-Round Practice • Full-Length Physics & Chemistry Numericals • Biology Integrated Case Studies • Mathematics Challenge Problems • English Literature Master Set • Bengali Analytical Master Set • 100-Question Grand Revision Test • Final Error-Elimination Strategy.

Writing

WBCHSE CLASS XII SEMESTER III

Subject-Wise Model Question Bank — Part 26

COMPLETE EXAMINATION SIMULATION • FULL MOCK PRACTICE • ADVANCED NUMERICAL MARATHON • CASE-STUDY CHALLENGE • INTEGRATED MATHEMATICS • ENGLISH & BENGALI WRITING MASTER TEST • 30-DAY REVISION BLUEPRINT

Physics | Chemistry | Biological Science | Mathematics | English | Bengali

INTRODUCTION

Welcome to Part 26 of the WBCHSE Class XII Semester III Subject-Wise Model Question Bank.

The earlier parts focused on learning concepts and practising different question styles.

Now we move toward another important stage:

EXAMINATION SIMULATION

There is a difference between:

knowing a chapter

and

being able to perform under examination conditions.

A student may understand a formula perfectly but make a calculation error under pressure.

A student may know an English writing format but waste too much time.

A student may understand a Biology chapter but forget an important keyword.

A Mathematics student may know the method but lose marks through one sign error.

Therefore, examination preparation must eventually include:

Knowledge + Speed + Accuracy + Time Management + Emotional Control

This Part 26 brings all five together.

HOW TO USE THIS PART

For the mock sections:

Keep your textbook closed.

Keep your phone away if possible.

Set a timer.

Attempt questions independently.

Do not check the answer key during the test.

Mark uncertain answers.

Check answers only after completing the test.

Record every mistake.

Retest the difficult questions later.

Remember:

The purpose of a mock test is not merely to obtain a score. It is to discover what needs improvement before the actual examination.

PART I — PHYSICS

FULL PRACTICE TEST

SECTION A — CONCEPTUAL QUESTIONS

Question 1

Define electric potential difference.

Question 2

Two capacitors are connected in parallel.

Which quantity is common to both?

Explain.

Question 3

State Ohm's law.

Mention one important condition under which it is applicable.

Question 4

Why does a charged particle moving perpendicular to a uniform magnetic field follow a circular path?

Question 5

State Faraday's law of electromagnetic induction.

SECTION B — MCQs

Question 6

The SI unit of capacitance is:

A. Ohm

B. Farad

C. Tesla

D. Weber

Question 7

For a resistor:

[ V=IR ]

If R is constant and V doubles, I:

A. halves

B. doubles

C. becomes four times

D. remains unchanged

Question 8

Magnetic force on a moving charge is maximum when the angle between velocity and magnetic field is:

A. 0^\circ

B. 30^\circ

C. 60^\circ

D. 90^\circ

Question 9

The SI unit of magnetic flux is:

A. Tesla

B. Weber

C. Henry

D. Volt

Question 10

Lenz's law is associated with:

A. direction of induced current

B. resistance

C. capacitance

D. electric potential

SECTION C — NUMERICALS

Question 11

A capacitor of capacitance:

[ 4\mu F ]

is connected to a 25 V source.

Find the charge stored.

Question 12

Calculate the energy stored in the capacitor of Question 11.

Question 13

A resistor of 6\Omega is connected to a 12 V source.

Calculate:

current,

power.

Question 14

Two resistors 4\Omega and 8\Omega are connected in series.

Find equivalent resistance.

Question 15

The same resistors are connected in parallel.

Find equivalent resistance.

SECTION D — CASE STUDY

A student connects a variable voltage source to a resistor and records:

V

I

2 V

0.4 A

4 V

0.8 A

6 V

1.2 A

8 V

1.6 A

Question 16

Determine whether the conductor approximately obeys Ohm's law.

Question 17

Calculate its resistance.

Question 18

Predict current at 10 V if the same relationship continues.

SECTION E — HOTS

Question 19

An isolated charged capacitor has its plate separation increased.

Explain what happens to:

capacitance,

charge,

potential difference.

Question 20

Why does electromagnetic induction demonstrate the importance of changing magnetic flux rather than magnetic field alone?

PHYSICS ANSWER KEY

B

B

D

B

A

Question 11

[ Q=CV ]

[ Q=4\times25 ]

[ Q=100\mu C ]

Question 12

[ U=\frac12CV^2 ]

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

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

Question 13

[ I=\frac{12}{6}=2A ]

[ P=VI=12\times2=24W ]

Question 14

[ R_{eq}=4+8=12\Omega ]

Question 15

[ \frac1R=\frac14+\frac18 ]

[ \frac1R=\frac38 ]

Therefore:

[ R=\frac83\Omega ]

Question 16

Yes.

The ratio V/I is constant.

Question 17

[ R=\frac{2}{0.4}=5\Omega ]

Question 18

[ I=\frac{10}{5}=2A ]

PART II — CHEMISTRY

FULL PRACTICE TEST

SECTION A — CONCEPTS

Question 21

Define electrode potential.

Question 22

Differentiate between oxidation and reduction.

Question 23

What is the role of a salt bridge?

Question 24

What is meant by first-order reaction?

Question 25

Define half-life.

SECTION B — MCQs

Question 26

Oxidation occurs at:

A. Cathode

B. Anode

C. Salt bridge

D. Electrolyte

Question 27

The unit of conductance is:

A. Siemens

B. Volt

C. Tesla

D. Joule

Question 28

For a first-order reaction:

[ t_{1/2} ]

is:

A. dependent on initial concentration

B. independent of initial concentration

C. always zero

D. infinite

Question 29

A ligand donates:

A. an electron pair to the central metal

B. a proton only

C. a neutron

D. a photon

SECTION C — NUMERICAL MARATHON

Question 30

Given:

[ E_{cathode}=0.75V ]

[ E_{anode}=0.25V ]

Calculate cell potential.

Question 31

For a first-order reaction:

[ k=0.0462,min^{-1} ]

Find half-life.

Question 32

If:

[ R=25\Omega ]

calculate conductance.

SECTION D — COORDINATION CHEMISTRY

Consider:

[ [Co(NH_3)_6]^{3+} ]

Question 33

Identify the central metal.

Question 34

Identify the ligand.

Question 35

Find coordination number.

Question 36

Find oxidation state.

SECTION E — CASE STUDY

A reaction has concentrations:

Time

Concentration

0 min

1.0 M

10 min

0.5 M

20 min

0.25 M

30 min

0.125 M

Question 37

What does the pattern suggest?

Question 38

What is the approximate half-life?

Question 39

Predict concentration after 40 minutes if the same pattern continues.

CHEMISTRY ANSWER KEY

B

A

B

A

Question 30

[ E_{cell}=0.75-0.25=0.50V ]

Question 31

[ t_{1/2}=\frac{0.693}{0.0462} ]

[ =15,min ]

Question 32

[ G=\frac1{25}=0.04S ]

Question 33

Co

Question 34

NH_3

Question 35

6

Question 36

[ +3 ]

Question 37

The pattern is consistent with first-order behaviour.

Question 38

Approximately 10 minutes.

Question 39

Approximately:

[ 0.0625M ]

PART III — BIOLOGICAL SCIENCE

FULL PRACTICE TEST

SECTION A — SHORT QUESTIONS

Question 40

What is DNA replication?

Question 41

Why is DNA replication called semi-conservative?

Question 42

Define transcription.

Question 43

Define translation.

Question 44

What is a codon?

Question 45

What is a mutation?

SECTION B — CASE STUDY

A gene undergoes a single nucleotide substitution.

Question 46

What type of mutation is this?

Question 47

Can it alter an amino-acid sequence?

Question 48

Can it have no observable effect?

Question 49

Why are mutations important in evolution?

SECTION C — EVOLUTION

Question 50

Define variation.

Question 51

Explain natural selection.

Question 52

Why are fossils considered evidence of evolutionary history?

SECTION D — HOTS

Question 53

Evaluate:

“All mutations are harmful.”

Question 54

Evaluate:

“Organisms consciously develop mutations when the environment changes.”

SECTION E — DIAGRAM CHALLENGE

Draw and label:

DNA replication fork

transcription

translation

chromosome

Do not copy from the textbook.

Draw from memory first.

BIOLOGY ANSWER GUIDANCE

Question 41

Each daughter DNA molecule contains one parental strand and one newly synthesised strand.

Question 46

It is a point mutation/base substitution.

Question 47

Yes, depending on the codon affected.

Question 48

Yes. It may be a silent mutation.

Question 49

Mutations can introduce genetic variation on which evolutionary processes may act.

Question 53

False.

Mutations may be harmful, neutral or beneficial depending on circumstances.

Question 54

False.

The statement incorrectly treats mutation as a conscious response to need.

PART IV — MATHEMATICS

FULL PRACTICE TEST

SECTION A — DIFFERENTIATION

Question 55

Differentiate:

[ y=x^3\cos x ]

Question 56

Differentiate:

[ y=e^x\sin x ]

Question 57

Differentiate:

[ y=\ln x ]

SECTION B — INTEGRATION

Question 58

Evaluate:

[ \int(4x^3+2x-5),dx ]

Question 59

Evaluate:

[ \int e^x dx ]

SECTION C — DIFFERENTIAL EQUATION

Question 60

Solve:

[ \frac{dy}{dx}=5x^2-2 ]

SECTION D — VECTORS

Let:

[ \vec a=\hat i+2\hat j+2\hat k ]

[ \vec b=2\hat i-\hat j+\hat k ]

Question 61

Find:

[ \vec a\cdot\vec b ]

Question 62

Find:

[ |\vec a| ]

Question 63

Determine whether the vectors are perpendicular.

SECTION E — PROBABILITY

Question 64

A fair coin is tossed four times.

Find the probability of exactly three heads.

Question 65

A die is thrown once.

Find the probability of obtaining an odd number.

SECTION F — 3D GEOMETRY

Question 66

Find the direction cosines corresponding to direction ratios:

[ 2,1,2 ]

SECTION G — INTEGRATED HOTS

Question 67

A student differentiates:

[ y=x^2\sin x ]

as:

[ 2x\cos x ]

Identify all the errors.

MATHEMATICS ANSWER KEY

Question 55

[ \frac{dy}{dx}

3x^2\cos x-x^3\sin x ]

Question 56

[ \frac{dy}{dx}

e^x(\sin x+\cos x) ]

Question 57

[ \frac1x ]

Question 58

[ x^4+x^2-5x+C ]

Question 59

[ e^x+C ]

Question 60

[ y=\frac53x^3-2x+C ]

Question 61

[ (1)(2)+(2)(-1)+(2)(1) ]

[ =2-2+2=2 ]

Question 62

[ |\vec a|

\sqrt{1+4+4} =3 ]

Question 63

No.

Dot product is 2, not zero.

Question 64

[ P=\frac{\binom43}{2^4} ]

[ =\frac4{16} =\frac14 ]

Question 65

Odd numbers:

[ 1,3,5 ]

Therefore:

[ P=\frac36=\frac12 ]

Question 66

Magnitude:

[ \sqrt{2^2+1^2+2^2}=3 ]

Direction cosines:

[ \frac23,\frac13,\frac23 ]

Question 67

The student has used neither the correct product rule nor the correct derivatives.

Correct answer:

[ \frac{dy}{dx}

2x\sin x+x^2\cos x ]

PART V — ENGLISH

FULL WRITING AND LANGUAGE TEST

SECTION A — READING

Read:

Preparation becomes more effective when students regularly evaluate their own understanding. Merely reading a chapter repeatedly can create familiarity, but familiarity is not always the same as mastery. A student who closes the book and attempts to recall the main ideas is testing actual understanding. Mistakes made during this process are valuable because they reveal areas requiring further study.

Questions

What is the main idea?

Why is familiarity not always mastery?

What method does the passage recommend?

Why are mistakes useful?

Give a suitable title.

SECTION B — SUMMARY

Question 68

Write a summary of the passage in approximately one-third of its length.

SECTION C — ARTICLE

Question 69

Write an article on:

“Self-Discipline and Academic Success”

Discuss:

meaning of self-discipline,

regular study,

avoiding distractions,

time management,

consistency,

conclusion.

SECTION D — REPORT

Question 70

Write a report on:

“A Mock Test Programme Organised by Your Institution”

Mention:

date,

venue,

purpose,

participation,

examination arrangements,

student response.

SECTION E — FORMAL LETTER

Question 71

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

SECTION F — GRAMMAR

Question 72

Change into passive voice:

“The students completed the examination.”

Question 73

Change into indirect speech:

The teacher said, “You should practise regularly.”

Question 74

Correct:

“He is senior than me.”

Question 75

Combine:

He studied hard. He remained calm.

Use an appropriate conjunction.

ENGLISH ANSWER KEY

Question 72

The examination was completed by the students.

Question 73

The teacher advised the students that they should practise regularly.

Question 74

He is senior to me.

Question 75

He studied hard and remained calm.

PART VI — BENGALI

বাংলা — পূর্ণাঙ্গ অনুশীলন

SECTION A — গদ্য

প্রশ্ন ৭৬

গদ্যের মূল বক্তব্য নির্ণয় করার পদ্ধতি আলোচনা করো।

প্রশ্ন ৭৭

কোনও চরিত্রের কাজ ও কথাবার্তা কীভাবে তার ব্যক্তিত্ব প্রকাশ করে?

SECTION B — পদ্য

প্রশ্ন ৭৮

কবিতায় চিত্রকল্পের ভূমিকা আলোচনা করো।

প্রশ্ন ৭৯

কবিতায় প্রতীক ব্যবহারের তাৎপর্য ব্যাখ্যা করো।

SECTION C — ব্যাকরণ

প্রশ্ন ৮০

সমাস নির্ণয় করো:

জন্মভূমি

প্রশ্ন ৮১

সন্ধি বিচ্ছেদ করো:

মহাশয়

প্রশ্ন ৮২

বাক্যের প্রকৃতি নির্ণয় করো:

“যদি তুমি নিয়মিত পড়ো, তবে তুমি ভালো ফল করতে পারবে।”

SECTION D — রচনা

প্রশ্ন ৮৩

রচনা লেখো:

“সময়ের মূল্য”

আলোচনা করো:

সময়ের সংজ্ঞা

ছাত্রজীবনে সময়

সময় নষ্টের ক্ষতি

পরিকল্পনা

প্রযুক্তির ব্যবহার

উপসংহার

SECTION E — বিশ্লেষণধর্মী প্রশ্ন

প্রশ্ন ৮৪

“সাফল্যের জন্য প্রতিভার পাশাপাশি নিয়মিত অনুশীলনও প্রয়োজন।”

বক্তব্যটি বিশ্লেষণ করো।

বাংলা উত্তর লেখার সূত্র

প্রতিটি বড় উত্তরে চেষ্টা করো:

ভূমিকা → মূল বক্তব্য → ব্যাখ্যা → উদাহরণ → বিশ্লেষণ → উপসংহার

ভাষা হবে:

পরিষ্কার,

সংক্ষিপ্ত,

প্রাসঙ্গিক,

ব্যাকরণসম্মত।

PART VII — GRAND MIXED CHALLENGE

এখন ছয়টি বিষয়কে একসঙ্গে রেখে একটি দ্রুত পরীক্ষা।

Physics — Question 85

Explain why magnetic force can change the direction of a charged particle's motion without necessarily changing its speed.

Chemistry — Question 86

Explain why the half-life of a first-order reaction does not depend on initial concentration.

Biology — Question 87

Explain how mutation can create variation in a population.

Mathematics — Question 88

Evaluate:

[ \int(3x^2+4x+1),dx ]

English — Question 89

Write 100 words on:

“Practice Makes Progress.”

Bengali — প্রশ্ন ৯০

প্রায় ১০০ শব্দে লেখো:

“নিয়মিত অনুশীলন ও আত্মবিশ্বাস”

PART VIII — 30-DAY REVISION BLUEPRINT

Now comes one of the most useful sections.

DAYS 1–5 — FOUNDATION

Revise:

definitions,

formulas,

fundamental concepts,

important terminology.

Do not rush into difficult questions before the foundation is stable.

DAYS 6–10 — APPLICATION

Solve:

numerical problems,

case studies,

assertion–reason,

competency questions.

Focus on how concepts are used.

DAYS 11–15 — MIXED PRACTICE

Mix chapters.

Do not always solve questions chapter by chapter.

This trains the brain to identify the appropriate concept independently.

DAYS 16–20 — MOCK TEST PHASE

Take timed tests.

After each test:

calculate score,

identify mistakes,

classify mistakes,

revise weak areas,

retest.

DAYS 21–25 — WEAKNESS REPAIR

Focus mainly on:

repeated mistakes,

forgotten formulas,

difficult chapters,

writing weaknesses,

time-management problems.

Do not spend all your time revising topics you already know perfectly.

DAYS 26–28 — FINAL CONSOLIDATION

Revise:

formulas,

diagrams,

definitions,

important concepts,

grammar,

writing formats,

common mistakes.

DAY 29 — LIGHT MOCK

Take a shorter test.

Do not exhaust yourself.

Analyse calmly.

DAY 30 — FINAL REVIEW

Revise only:

mistake notebook,

formula sheets,

important definitions,

diagrams,

key writing formats.

Avoid trying to learn a huge amount of completely new material at the last moment.

PART IX — THE 5-NOTEBOOK SYSTEM

If practical, students can maintain five separate resources.

NOTEBOOK 1 — FORMULAS

Physics + Chemistry + Mathematics.

NOTEBOOK 2 — MISTAKES

Only questions you got wrong or could not answer properly.

NOTEBOOK 3 — DIAGRAMS

Biology diagrams and other important figures.

NOTEBOOK 4 — WRITING

English and Bengali formats, useful expressions and practice answers.

NOTEBOOK 5 — MOCK SCORES

Record:

date,

test,

score,

mistakes,

improvement target.

This makes progress visible.

PART X — SCORE IMPROVEMENT FORMULA

Suppose a student gets:

60 marks

Do not simply say:

“I need 80.”

Instead, identify where the missing marks went.

For example:

5 marks — concept errors

4 marks — calculation errors

3 marks — careless mistakes

5 marks — unanswered due to time

Now the problem becomes much clearer.

The student does not need to “become better at everything.”

The student needs to repair specific weaknesses.

PART XI — THE LAST-MINUTE MISTAKE CHECK

Before submitting an answer sheet, ask:

Physics

Did I write units?

Chemistry

Did I balance/check equations and signs where required?

Biology

Did I use correct terminology and labels?

Mathematics

Did I check signs and calculations?

English

Did I check grammar and paragraph organisation?

Bengali

বানান, বাক্যগঠন ও প্রাসঙ্গিকতা ঠিক আছে কি?

PART XII — PARENT'S FINAL SUPPORT

During the final preparation period, parents can help by protecting:

Sleep

Adequate rest supports concentration.

Food

Regular meals are important.

Quiet Study Time

Reduce unnecessary interruptions.

Emotional Stability

Avoid excessive comparison.

Most importantly:

A student's preparation should be encouraged, not constantly frightened into existence.

PART XIII — STUDENT'S FINAL MINDSET

You may encounter a day when your mock score falls.

Do not immediately conclude that your preparation has failed.

A mock test is a snapshot.

Look at the pattern across several tests.

Ask:

Are mistakes decreasing?

Is accuracy increasing?

Is speed improving?

Are difficult questions becoming easier?

Are repeated mistakes disappearing?

Those indicators tell you more than one isolated score.

PART XIV — THE FINAL GOLDEN RULE

Never confuse:

“I have read it”

with

“I can explain it.”

And never confuse:

“I can explain it”

with

“I can solve an unfamiliar question.”

Finally, never confuse:

“I can solve it”

with

“I can solve it accurately under examination conditions.”

True preparation gradually moves through all four stages.

FINAL MESSAGE

Dear students,

Part 26 is not simply another question set.

It is a reminder that examination preparation has several layers.

First:

Know the subject.

Then:

Understand the subject.

Then:

Practise the subject.

Then:

Test yourself.

Then:

Study your mistakes.

Then:

Retest yourself.

This process may feel slow at first.

But steady preparation creates something very valuable:

CONFIDENCE BASED ON EXPERIENCE.

Not empty confidence.

Not confidence based only on hope.

But the quiet confidence that comes from knowing:

“I have faced difficult questions before.”

“I have made mistakes before.”

“I corrected them.”

“I practised again.”

“I can try this question too.”

That mindset is worth developing throughout preparation.

Keep moving forward.

One chapter.

One question.

One correction.

One day at a time.

IMPORTANT DISCLAIMER

This model question bank is intended for educational practice, revision and general examination preparation. The questions are original practice/model questions and are not predictions, leaked questions or guarantees of actual examination questions.

Students should follow the latest applicable WBCHSE syllabus, prescribed textbooks, official examination notifications and instructions issued by their educational institution and relevant authorities.

Question formats, syllabus details, marks distribution and assessment procedures may vary. Students should verify current requirements through official sources and their teachers.

META DESCRIPTION

WBCHSE Class XII Semester III Model Question Bank Part 26 featuring complete subject-wise mock practice in Physics, Chemistry, Biological Science, Mathematics, English and Bengali, with advanced numericals, case studies, HOTS, writing practice, examination simulation and a 30-day revision blueprint.

KEYWORDS

WBCHSE Class 12 Semester 3

WBCHSE Class XII Semester III

WBCHSE Model Question Bank

WBCHSE Practice Questions

WBCHSE Mock Test

Class 12 Physics Questions

Class 12 Chemistry Questions

Class 12 Biological Science Questions

Class 12 Mathematics Questions

Class 12 English Questions

Class 12 Bengali Questions

WBCHSE Numerical Questions

WBCHSE HOTS Questions

WBCHSE Case Study Questions

WBCHSE Revision Strategy

Class 12 Exam Preparation

Higher Secondary Preparation

30 Day Revision Plan

Mock Test Strategy

Mistake Analysis

Score Improvement

Exam Time Management

Student Self Assessment

Class 12 Study Plan

HASHTAGS

#WBCHSE

#Class12

#Semester3

#WBCHSEQuestionBank

#ModelQuestions

#MockTest

#Physics

#Chemistry

#BiologicalScience

#Mathematics

#English

#Bengali

#Numericals

#HOTS

#CaseStudy

#Revision

#ExamPreparation

#HigherSecondary

#StudyPlan

#30DayRevision

#TimeManagement

#MistakeAnalysis

#ScoreImprovement

#StudentSuccess

#PracticeMakesProgress

END OF PART 26

NEXT PART

Part 27 — Advanced Final-Round Practice • Full-Length Physics & Chemistry Numericals • Biology Integrated Case Studies • Mathematics Challenge Problems • English Literature Master Set • Bengali Analytical Master Set • 100-Question Grand Revision Test • Final Error-Elimination Strategy.

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