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NEET 2027 Possible Questions Series — Part 50

English Edition

Physics • Chemistry • Biology

NCERT Focus • Concept Building • MCQ Practice • Active Recall • Error Analysis

Meta Description

NEET 2027 Part 50 with NCERT-focused practice questions from Physics, Chemistry and Biology, covering Wave Optics, Amines, and Human Health and Disease.

SEO Keywords

NEET 2027, NEET preparation, NEET MCQs, NCERT, Wave Optics, Amines, Human Health and Disease, Physics MCQ, Chemistry MCQ, Biology MCQ

Hashtags

#NEET2027 #NEETPreparation #NEETMCQ #NCERT #Physics #Chemistry #Biology #NEETAspirants #NEETRevision #NEETPractice

Introduction

Welcome to Part 50 of the NEET 2027 Possible Questions Series.

This milestone part covers:

⚛️ Physics — Wave Optics

🧪 Chemistry — Amines

🧬 Biology — Human Health and Disease

The objective is to strengthen concepts, improve recall and develop accuracy through focused MCQ practice.

Understand → Recall → Practise → Analyse → Revise

Important: These are independently prepared practice questions. They are not official NEET 2027 questions and are not guaranteed predictions.

⚛️ PHYSICS

Wave Optics

Question 1

The phenomenon of bending of light around the edges of an obstacle or aperture is called:

A. Reflection

B. Diffraction

C. Refraction

D. Polarisation

Answer: B. Diffraction

Question 2

Interference of light demonstrates the:

A. Particle nature only

B. Wave nature of light

C. Nuclear nature of light

D. Gravitational nature of light

Answer: B. Wave nature of light

Question 3

In Young's double-slit experiment, coherent sources should have:

A. Same frequency and a constant phase difference

B. Different frequencies

C. Random phase difference

D. Different wavelengths

Answer: A. Same frequency and a constant phase difference

Question 4

For constructive interference, the path difference is:

A. �

B. �

C. � only

D. Zero only

Answer: A. �

Question 5

For destructive interference, the path difference is:

A. �

B. �

C. �

D. Zero

Answer: B. �

Question 6

The fringe width in Young's double-slit experiment is:

A. �

B. �

C. �

D. �

Answer: A. �

Question 7

Polarisation of light proves that light is:

A. Longitudinal

B. Transverse

C. Mechanical only

D. Stationary

Answer: B. Transverse

Question 8

The phenomenon of splitting of white light into its constituent colours is called:

A. Interference

B. Diffraction

C. Dispersion

D. Reflection

Answer: C. Dispersion

🧪 CHEMISTRY

Amines

Question 1

Amines are derivatives of:

A. Ammonia

B. Methane only

C. Water

D. Carbon dioxide

Answer: A. Ammonia

Question 2

The functional group of primary amines is generally represented as:

A. –NH₂

B. –OH

C. –CHO

D. –COOH

Answer: A. –NH₂

Question 3

Which of the following is a primary amine?

A. CH₃NH₂

B. (CH₃)₂NH

C. (CH₃)₃N

D. CH₃CONH₂

Answer: A. CH₃NH₂

Question 4

Amines exhibit basic character mainly because nitrogen has:

A. A lone pair of electrons

B. No electrons

C. Only bonding electrons

D. A positive charge in every case

Answer: A. A lone pair of electrons

Question 5

Aniline is:

A. An aromatic amine

B. An alcohol

C. A ketone

D. A carboxylic acid

Answer: A. An aromatic amine

Question 6

The reaction of a primary aromatic amine with nitrous acid at low temperature can produce:

A. Diazonium salt

B. Ether

C. Alkene only

D. Ester only

Answer: A. Diazonium salt

Question 7

Amines can form salts with acids because they behave as:

A. Bases

B. Strong oxidising agents only

C. Metals

D. Inert gases

Answer: A. Bases

Question 8

The basicity of an amine depends on:

A. The availability of the nitrogen lone pair

B. Only the number of carbon atoms

C. Only molecular mass

D. The colour of the compound

Answer: A. The availability of the nitrogen lone pair

🧬 BIOLOGY

Human Health and Disease

Question 1

A disease-causing organism is called a:

A. Pathogen

B. Producer

C. Decomposer

D. Hormone

Answer: A. Pathogen

Question 2

Malaria is caused by:

A. Plasmodium

B. Salmonella

C. HIV

D. Entamoeba only

Answer: A. Plasmodium

Question 3

The vector of malaria is generally:

A. Female Anopheles mosquito

B. Male Anopheles mosquito

C. Housefly

D. Cockroach

Answer: A. Female Anopheles mosquito

Question 4

Typhoid is caused by:

A. Salmonella typhi

B. Plasmodium

C. HIV

D. Rhinovirus

Answer: A. Salmonella typhi

Question 5

AIDS is caused by:

A. HIV

B. HBV only

C. Plasmodium

D. Salmonella

Answer: A. HIV

Question 6

Antibodies are primarily produced by:

A. B-lymphocytes

B. Red blood cells

C. Platelets

D. Neurons

Answer: A. B-lymphocytes

Question 7

Vaccination primarily helps by:

A. Developing immune memory and protection

B. Destroying all cells

C. Increasing blood pressure

D. Stopping metabolism

Answer: A. Developing immune memory and protection

Question 8

Cancer involves:

A. Uncontrolled cell growth and division

B. Complete absence of cell division

C. Only bacterial infection

D. Only vitamin deficiency

Answer: A. Uncontrolled cell growth and division

📚 QUICK REVISION

⚛️ Physics — Wave Optics

Interference

Superposition of coherent light waves can produce bright and dark fringes.

Constructive Interference

Path Difference = �

Destructive Interference

Path Difference = �

Young's Double-Slit Experiment

Fringe Width:

Polarisation

Demonstrates the transverse nature of light.

Dispersion

Separation of white light into its constituent colours.

🧪 Chemistry — Amines

Amines

Organic derivatives of ammonia.

Primary Amine

R–NH₂

Secondary Amine

R₂NH

Tertiary Amine

R₃N

Basic Character

Related to the availability of the nitrogen lone pair.

Aniline

An aromatic amine.

Diazonium Salts

Important compounds obtained from primary aromatic amines under suitable conditions.

🧬 Biology — Human Health and Disease

Pathogen

Disease-causing organism.

Malaria

Plasmodium

Vector:

Female Anopheles mosquito

Typhoid

Salmonella typhi

AIDS

HIV

Antibodies

Produced primarily by B-lymphocytes/plasma cells.

Vaccination

Creates immune memory and helps provide protection.

Cancer

Characterised by abnormal and uncontrolled cell proliferation.

🧠 ACTIVE RECALL

Try answering without looking at the answers.

Physics

What does interference demonstrate?

What are coherent sources?

What is the condition for constructive interference?

What is the condition for destructive interference?

Write the expression for fringe width.

What does polarisation demonstrate about light?

Chemistry

Amines are derivatives of which compound?

What is the general structure of a primary amine?

Why are amines basic?

What type of amine is aniline?

What can be formed when a primary aromatic amine reacts with nitrous acid under suitable conditions?

Biology

What is a pathogen?

Which organism causes malaria?

What is the vector of malaria?

Which organism causes typhoid?

What virus causes AIDS?

Which cells are primarily responsible for antibody production?

What is the major characteristic of cancer?

🎯 CONCEPT CONNECTION

Physics

Coherent Sources → Superposition → Interference → Bright/Dark Fringes

Then:

Wave Nature → Polarisation → Transverse Nature

These connections make Wave Optics much easier to understand than memorising isolated formulas.

Chemistry

Ammonia → Amines → Lone Pair → Basic Character → Salt Formation

For aromatic amines:

Aniline → Diazonium Salt → Important Synthetic Applications

Understanding the availability of the nitrogen lone pair is central to the chemistry of amines.

Biology

Pathogen → Infection → Immune Response → Antibodies → Memory

Vaccination uses the body's immune system to develop protection and immunological memory.

📊 ERROR ANALYSIS

After completing the questions, classify each mistake:

Concept Error

You misunderstood the underlying principle.

Recall Error

You had studied it but could not remember it.

Application Error

You knew the concept but could not apply it.

Formula Error

You confused a formula or condition.

Careless Error

You selected the wrong option despite knowing the concept.

Record:

Question → My Answer → Correct Answer → Reason → Revision

Then retest the same concept later.

Remember:

A mistake becomes valuable when you understand why it happened.

📖 SMART REVISION STRATEGY

Physics

For Wave Optics:

Concept → Diagram → Formula → Condition → MCQ

Draw the Young's double-slit arrangement and practise identifying path difference conditions.

Chemistry

For Amines:

Structure → Classification → Basicity → Reactions → Diazonium Chemistry → MCQ

Make a small comparison table for primary, secondary and tertiary amines.

Biology

For Human Health and Disease:

Disease → Pathogen → Transmission → Symptoms → Prevention → Immunity

NCERT-based factual revision is especially important for this section.

🌟 MOTIVATION

My friend, Part 50 is not just another number. It is evidence of consistency.

Whether you are studying for a competitive examination or simply trying to become better at learning, consistency matters enormously.

You do not need to feel motivated every day.

Some days you will study with enthusiasm.

Other days you may study simply because you have decided not to quit.

Both days matter.

The second kind of day may actually teach you something more important than a chapter:

Discipline.

Remember, preparation is not built in one dramatic session.

It is built through ordinary days:

One page.

One concept.

One question.

One mistake.

One correction.

One revision.

Then another.

And another.

Eventually, those small actions become knowledge.

Knowledge becomes confidence.

Confidence becomes accuracy.

And accuracy becomes performance.

Do not underestimate small consistent effort.

You may not notice the change immediately.

But if you keep learning, revising and correcting your mistakes, your future self will be stronger than your present self.

Keep going. The work you repeat today becomes the strength you rely on tomorrow. 🌟

🔄 SEVEN-STEP STUDY CYCLE

1. Read

Read the relevant NCERT material carefully.

2. Understand

Identify the central concept.

3. Recall

Close the book and reproduce the important information.

4. Practise

Solve MCQs independently.

5. Analyse

Understand every incorrect answer.

6. Revise

Return to weak areas.

7. Retest

Test yourself again after an appropriate interval.

Study → Recall → Test → Correct → Repeat

⚠️ IMPORTANT NEET REMINDER

Do not rely only on predicted or possible questions.

A strong preparation should include:

NCERT + Official Syllabus + Previous-Year Questions + MCQs + Mock Tests + Revision + Error Analysis

Use possible questions as additional practice, not as a guarantee of what will appear in the examination.

⚠️ DISCLAIMER

This material is provided for educational and practice purposes only.

The questions are independently prepared practice questions. They are not official NEET 2027 questions and are not guaranteed predictions.

No one can reliably guarantee the exact questions that will appear in a future examination.

Students should prioritise the latest official syllabus, NCERT textbooks, previous-year questions and official examination information.

🔑 PART 50 KEY TAKEAWAYS

⚛️ Physics

Interference → Wave Nature

Coherent Sources → Same Frequency + Constant Phase Difference

Constructive → �

Destructive → �

Fringe Width → �

Polarisation → Transverse Nature

Dispersion → Splitting of White Light

🧪 Chemistry

Amines → Derivatives of Ammonia

Primary → R–NH₂

Secondary → R₂NH

Tertiary → R₃N

Basicity → Nitrogen Lone Pair

Aniline → Aromatic Amine

Primary Aromatic Amine → Diazonium Salt under suitable conditions

🧬 Biology

Pathogen → Disease-Causing Organism

Malaria → Plasmodium

Vector → Female Anopheles

Typhoid → Salmonella typhi

AIDS → HIV

Antibodies → B-lymphocytes/Plasma Cells

Vaccination → Immune Memory

Cancer → Uncontrolled Cell Proliferation

Conclusion

Part 50 has covered:

⚛️ Wave Optics

🧪 Amines

🧬 Human Health and Disease

Reaching Part 50 is a reminder that serious preparation is built through continuity, not through occasional bursts of effort.

You don't have to master everything at once.

Master one concept.

Then another.

Correct one mistake.

Then another.

Revise one weak area.

Then another.

Progress is created by repeated improvement.

So keep your study honest, your revision regular and your mistakes visible.

Learn → Recall → Practise → Analyse → Revise → Repeat

And remember:

You don't have to be perfect today. You only have to keep moving forward. 🌟

Written with AI