Meta DescriptionNEET 2027 preparation material – Part 36 with NCERT-based Physics, Chemistry and Biology MCQs covering Nuclei, Aldehydes Ketones and Carboxylic Acids, and Ecosystem, with concept revision, practice questions, study strategy and disclaimer.SEO KeywordsNEET 2027, NEET preparation, NEET MCQs, Physics MCQs, Chemistry MCQs, Biology MCQs, NCERT, Nuclei, Aldehydes Ketones Carboxylic Acids, EcosystemHashtags#NEET2027 #NEETPreparation #NEETMCQ #PhysicsMCQ #ChemistryMCQ #BiologyMCQ #NCERT #Nuclei #Aldehydes #Ketones #CarboxylicAcids #Ecosystem #NEETAspirants
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NEET 2027 preparation material – Part 36 with NCERT-based Physics, Chemistry and Biology MCQs covering Nuclei, Aldehydes Ketones and Carboxylic Acids, and Ecosystem, with concept revision, practice questions, study strategy and disclaimer.
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NEET 2027, NEET preparation, NEET MCQs, Physics MCQs, Chemistry MCQs, Biology MCQs, NCERT, Nuclei, Aldehydes Ketones Carboxylic Acids, Ecosystem
Hashtags
#NEET2027 #NEETPreparation #NEETMCQ #PhysicsMCQ #ChemistryMCQ #BiologyMCQ #NCERT #Nuclei #Aldehydes #Ketones #CarboxylicAcids #Ecosystem #NEETAspirants
Introduction
Welcome to Part 36 of the NEET 2027 Possible Questions Series.
This part covers:
⚛️ Physics — Nuclei
🧪 Chemistry — Aldehydes, Ketones and Carboxylic Acids
🧬 Biology — Ecosystem
The questions are designed for:
NCERT-based revision
Concept building
MCQ practice
Active recall
Error analysis
NEET-oriented preparation
These are practice questions, not official or guaranteed NEET 2027 questions.
⚛️ Physics
Nuclei
Question 1
The atomic nucleus consists mainly of:
A. Electrons and photons
B. Protons and neutrons
C. Neutrons and electrons
D. Protons and electrons
Answer: B. Protons and neutrons
Question 2
The mass number of a nucleus is equal to:
A. Number of protons only
B. Number of neutrons only
C. Total number of protons and neutrons
D. Number of electrons and protons
Answer: C. Total number of protons and neutrons
If Z = number of protons and N = number of neutrons, then:
A = Z + N
Question 3
The phenomenon in which a heavy nucleus splits into two or more lighter nuclei is called:
A. Fusion
B. Fission
C. Ionisation
D. Excitation
Answer: B. Fission
Question 4
Nuclear binding energy is related to:
A. Mass defect
B. Atomic number only
C. Number of electrons only
D. Chemical bonding only
Answer: A. Mass defect
The relation is:
E = Δmc²
Question 5
Which radiation has the highest penetrating power among the following?
A. Alpha rays
B. Beta rays
C. Gamma rays
D. Visible light
Answer: C. Gamma rays
🧪 Chemistry
Aldehydes, Ketones and Carboxylic Acids
Question 1
The functional group of aldehydes is:
A. –OH
B. –CHO
C. –COOH
D. –CO–
Answer: B. –CHO
Question 2
The functional group of ketones is:
A. –CHO
B. –COOH
C. >C=O
D. –OH
Answer: C. >C=O
Question 3
Aldehydes can generally be oxidised to:
A. Alcohols only
B. Carboxylic acids
C. Ethers
D. Alkanes only
Answer: B. Carboxylic acids
Question 4
The Tollens' reagent test is commonly used to identify:
A. Aldehydes
B. Alkanes
C. Ethers
D. Amines only
Answer: A. Aldehydes
A positive Tollens' test is associated with formation of a silver mirror under appropriate conditions.
Question 5
The functional group of carboxylic acids is:
A. –CHO
B. –OH
C. –COOH
D. –CO–
Answer: C. –COOH
🧬 Biology
Ecosystem
Question 1
An ecosystem consists of:
A. Only plants
B. Only animals
C. Biotic community and its abiotic environment
D. Only microorganisms
Answer: C. Biotic community and its abiotic environment
Question 2
The primary producers in most ecosystems are:
A. Herbivores
B. Green plants
C. Carnivores
D. Decomposers
Answer: B. Green plants
Question 3
The major source of energy for most ecosystems is:
A. Soil
B. Moon
C. Sun
D. Wind
Answer: C. Sun
Question 4
Decomposers mainly include:
A. Birds and mammals
B. Bacteria and fungi
C. Herbivores only
D. Green plants
Answer: B. Bacteria and fungi
Question 5
The movement of energy through an ecosystem is generally:
A. Cyclic
B. Unidirectional
C. Random
D. Reversible
Answer: B. Unidirectional
📚 Quick Revision
Physics — Nuclei
Remember:
Atomic Number
Z = Number of Protons
Mass Number
A = Z + N
where:
A = Mass Number
Z = Number of Protons
N = Number of Neutrons
Mass Defect
The difference between the mass of separated nucleons and the actual mass of the nucleus is related to nuclear binding energy.
E = Δmc²
Radioactive Decay
Radioactivity is a spontaneous nuclear process.
Important types:
Alpha (α)
Helium nucleus
Relatively high ionising power
Low penetrating power
Beta (β)
High-speed electron or positron, depending on the decay process
Greater penetrating ability than alpha radiation
Gamma (γ)
Electromagnetic radiation
Very high penetrating power
No charge
For NEET, learn the basic properties and changes in atomic number and mass number during different decay processes.
Nuclear Fission vs Fusion
Feature
Fission
Fusion
Process
Heavy nucleus splits
Light nuclei combine
Example
Uranium-type nuclei
Hydrogen isotopes
Energy
Large energy release
Very large energy release
Conditions
Can be initiated by neutron interactions
Requires extremely high temperature and suitable conditions
Quick Memory
Fission → Splitting
Fusion → Combining
🧪 Chemistry
Aldehydes, Ketones and Carboxylic Acids
Important areas:
Nomenclature
Preparation
Physical properties
Nucleophilic addition
Oxidation
Reduction
Aldol reaction
Cannizzaro reaction
Tollens' test
Fehling's test
Acidity of carboxylic acids
Important reactions of carboxylic acids
Aldehydes vs Ketones
Both contain the carbonyl group (C=O).
Aldehyde
R–CHO
Ketone
R–CO–R′
Aldehydes generally undergo oxidation more readily than ketones.
This distinction is important for many qualitative-analysis questions.
Carboxylic Acids
General structure:
R–COOH
The acidic hydrogen is associated with the –OH group.
The resulting carboxylate ion is stabilised by resonance.
Therefore, resonance is an important concept for understanding carboxylic acid acidity.
🧬 Biology
Ecosystem
An ecosystem contains:
Biotic Components
Producers
Consumers
Decomposers
Abiotic Components
Light
Temperature
Water
Soil
Minerals
Atmospheric factors
Food Chain
A simple food chain may be represented as:
Producer → Primary Consumer → Secondary Consumer → Higher Consumer
For example:
Grass → Grasshopper → Frog → Snake
Energy decreases as we move to higher trophic levels.
Energy Flow
Energy flow in an ecosystem is unidirectional.
A simplified representation is:
Sun → Producers → Consumers → Decomposers
Energy is lost as heat during transfer between trophic levels.
This is why energy flow should not be confused with nutrient cycling.
Ecological Pyramids
Important types include:
Pyramid of Number
Pyramid of Biomass
Pyramid of Energy
Important NEET Concept
The pyramid of energy is always upright, because energy decreases at successive trophic levels.
💡 Concept Booster
1. Binding Energy
Nuclear stability is closely associated with binding energy per nucleon.
A nucleus with a relatively high binding energy per nucleon is generally more tightly bound.
For NEET, understand:
Mass Defect → Binding Energy → Nuclear Stability
Do not simply memorise the equation.
2. Radioactive Decay
Radioactive decay follows a statistical law.
The number of undecayed nuclei decreases with time.
A commonly used equation is:
N = N₀e⁻λt
where:
N₀ = initial number of nuclei
N = number remaining after time t
λ = decay constant
t = time
The half-life is related to the decay constant by:
T₁/₂ = 0.693/λ
3. Organic Chemistry Reaction Thinking
For every reaction, ask:
What is the functional group?
Which reagent is being used?
What reaction mechanism is likely?
What is the final product?
This approach is much more useful than memorising isolated equations.
4. Ecosystem Thinking
When studying an ecosystem, connect:
Energy → Food Chain → Trophic Level → Energy Loss
and:
Nutrients → Decomposition → Recycling
A common NEET trap is confusing energy flow with nutrient cycling.
Energy flows.
Nutrients cycle.
Remember this distinction.
📝 Practice Challenge
Try these without looking at the answers.
Physics
What particles are present in the nucleus?
Define mass number.
What is mass defect?
What is nuclear binding energy?
Differentiate between fission and fusion.
Chemistry
What is the functional group of an aldehyde?
What is the functional group of a ketone?
What does Tollens' reagent test for?
What is the functional group of a carboxylic acid?
Why are carboxylic acids acidic?
Biology
What are the components of an ecosystem?
Who are the primary producers?
What is a food chain?
Why is energy flow unidirectional?
Which ecological pyramid is always upright?
🎯 NEET-Focused Study Strategy
Physics
For Nuclei, prepare a one-page formula and concept sheet containing:
Atomic number
Mass number
Mass defect
Binding energy
Binding energy per nucleon
Radioactive decay
Half-life
Mean life
Fission
Fusion
Then solve numerical questions.
Chemistry
Create a reaction chart:
Aldehyde
Oxidation → Carboxylic Acid
Reduction → Alcohol
Ketone
Reduction → Secondary Alcohol
Carboxylic Acid
Focus on:
Acidity → Salt Formation → Esterification → Important Reactions
Then practise NCERT-based reaction questions.
Biology
For Ecosystem, make a diagram showing:
Sun
↓
Producers
↓
Primary Consumers
↓
Secondary Consumers
↓
Higher Consumers
Then separately study:
Decomposers → Nutrient Recycling
This separation helps prevent confusion between food chains and decomposition.
🧠 Active Recall Challenge
Close the book and complete:
Physics
A = ______ + ______
E = ______
T₁/₂ = ______
Chemistry
Aldehyde → ______
Ketone → ______
Carboxylic Acid Functional Group = ______
Biology
Sun → ______ → ______ → ______
Energy flow = ______
Pyramid of Energy = always ______
If you cannot answer immediately, mark the concept for revision.
📊 Error Analysis
After completing your MCQs, classify each error.
Error
Example
Concept
Confusing fission and fusion
Formula
Incorrect half-life relation
Reaction
Choosing wrong organic product
NCERT Fact
Incorrect ecosystem component
Application
Misunderstanding trophic levels
Careless Reading
Missing “always” or “not”
Do not merely record the wrong answer.
Record why you chose it.
That makes the Error Log much more useful.
🌟 Motivation
A high NEET score is not usually created by one extraordinary study session.
It is built through repeated cycles:
Study → Practise → Make Mistakes → Analyse → Correct → Repeat
Some questions will feel easy.
Some will expose weaknesses.
Both are useful.
Easy questions build confidence.
Difficult questions identify what needs improvement.
The purpose of practice is not to prove that you already know everything.
The purpose of practice is to discover what you still need to learn.
🔄 Seven-Step Revision Cycle
1. Learn
Understand the NCERT concept.
2. Recall
Reproduce it without looking.
3. Practise
Solve MCQs.
4. Analyse
Understand every mistake.
5. Revise
Return to the relevant section.
6. Retest
Solve similar questions after a gap.
7. Track
Monitor recurring weak areas.
Repeated correction creates lasting improvement.
📅 Suggested One-Day Plan
Physics
Nuclei: 45–60 minutes
Theory
Formula Revision
Radioactivity
Fission/Fusion
Numericals
Chemistry
Aldehydes, Ketones and Carboxylic Acids: 60–75 minutes
Functional Groups
Important Reactions
Qualitative Tests
NCERT Revision
MCQs
Biology
Ecosystem: 60–90 minutes
NCERT Reading
Food Chains
Energy Flow
Ecological Pyramids
Decomposition
MCQs
Final Review
Spend 20–30 minutes reviewing only the concepts you got wrong or could not recall confidently.
⚠️ Important NEET Reminder
Do not rely exclusively on predicted or expected questions.
A comprehensive NEET preparation should include:
NCERT + Official Syllabus + Previous-Year Questions + Mock Tests + MCQs + Error Analysis + Repeated Revision
Possible-question series can help with practice, but they cannot replace complete syllabus preparation.
⚠️ Disclaimer
This material is provided for educational and practice purposes only.
The questions in this series are not official NEET 2027 questions and are not guaranteed predictions of the actual examination.
Students should use the latest NCERT textbooks, official NEET syllabus, previous-year papers and reliable educational resources for their preparation.
Conclusion
Part 36 Focus
⚛️ Nuclei
🧪 Aldehydes, Ketones and Carboxylic Acids
🧬 Ecosystem
Remember:
Learn → Recall → Practise → Analyse → Revise → Retest
For Physics, understand the relationship between mass defect, binding energy and nuclear stability.
For Chemistry, connect functional groups, reagents and products.
For Biology, clearly distinguish energy flow from nutrient cycling.
One Concept → One Question → One Correction → One Improvement
Every corrected error strengthens your preparation.
Every revision strengthens retention.
Every carefully analysed MCQ helps you become more accurate.
🌟 Best wishes to every NEET 2027 aspirant.
Study consistently. Understand deeply. Practise intelligently. Analyse honestly. Revise repeatedly.
Your goal is not perfection in one day. Your goal is continuous improvement.
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