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NEET 2027 POSSIBLE QUESTIONS SERIES — PART 73

English Edition

Physics • Chemistry • Biology

NCERT-Focused Preparation • Concept Building • MCQ Practice • Active Recall • Error Analysis

Meta Description

NEET 2027 preparation with Part 73 covering Current Electricity, Alcohols Phenols and Ethers, and Principles of Inheritance and Variation through NCERT-focused explanations, MCQs, active recall and revision strategies.

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NEET 2027, NEET 2027 Possible Questions, NEET Physics MCQ, Current Electricity NEET, NEET Chemistry MCQ, Alcohols Phenols Ethers, NEET Biology MCQ, Genetics NEET, Mendelian Inheritance, NCERT NEET Preparation

Hashtags

#NEET2027 #NEETPreparation #NEETPhysics #NEETChemistry #NEETBiology #NCERT #NEETMCQ #Genetics #CurrentElectricity #OrganicChemistry #NEETRevision

INTRODUCTION

Welcome to Part 73 of our NEET 2027 Possible Questions Series.

The purpose of this series is not to predict the exact NEET 2027 paper. Instead, it is designed to help you build a strong foundation through:

NCERT-based concepts

Important definitions

Formula revision

MCQ practice

Active recall

Error analysis

Repeated revision

Our study cycle remains:

Read → Understand → Recall → Practise → Analyse → Revise → Retest

In this part, we will study:

🔵 Physics

Current Electricity

🟢 Chemistry

Alcohols, Phenols and Ethers

🔴 Biology

Principles of Inheritance and Variation

🔵 PHYSICS

CURRENT ELECTRICITY

Current electricity deals with the flow of electric charge through a conductor.

Electric current is defined as the rate of flow of electric charge.

[ I=\frac{Q}{t} ]

where:

I = electric current

Q = charge

t = time

The SI unit of current is ampere (A).

Conventional Current

By convention, current is considered to flow from the positive terminal toward the negative terminal in an external circuit.

The actual movement of electrons in a metallic conductor is generally opposite to the conventional current direction.

Important distinction

Conventional current direction ≠ electron drift direction

This is a common conceptual point in examinations.

Potential Difference

Potential difference between two points is the work done per unit charge in moving a test charge between those points.

[ V=\frac{W}{Q} ]

where:

V = potential difference

W = work done

Q = charge

The SI unit is volt (V).

Ohm's Law

For many conductors under constant physical conditions:

[ V=IR ]

where:

V = potential difference

I = current

R = resistance

Resistance is measured in ohm (\Omega).

If resistance remains constant:

[ I=\frac{V}{R} ]

Therefore, increasing the potential difference increases the current.

Resistance of a Conductor

The resistance of a uniform conductor is:

[ R=\rho\frac{L}{A} ]

where:

R = resistance

\rho = resistivity

L = length

A = cross-sectional area

Therefore:

Increasing L generally increases R.

Increasing A generally decreases R.

Series Combination

For resistors connected in series:

[ R_s=R_1+R_2+R_3+\cdots ]

The same current flows through each resistor in a series circuit.

Parallel Combination

For resistors connected in parallel:

[ \frac1{R_p}

\frac1{R_1} + \frac1{R_2} + \frac1{R_3} +\cdots ]

The potential difference across parallel branches is the same.

ELECTRIC POWER

Electrical power is:

[ P=VI ]

Using Ohm's law:

[ P=I^2R ]

or

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

These relations are important for numerical problems.

Physics MCQ Practice

Question 1

Electric current is defined as:

A. Charge × time

B. Charge per unit time

C. Work per unit charge

D. Energy × charge

Answer: B. Charge per unit time

Question 2

The SI unit of electric current is:

A. Volt

B. Ohm

C. Ampere

D. Watt

Answer: C. Ampere

Question 3

The relation V=IR represents:

A. Faraday's law

B. Ohm's law

C. Coulomb's law

D. Newton's law

Answer: B. Ohm's law

Question 4

The SI unit of resistance is:

A. Ampere

B. Volt

C. Ohm

D. Joule

Answer: C. Ohm

Question 5

For a uniform conductor:

[ R=\rho\frac{L}{A} ]

If the length increases while other factors remain constant, resistance:

A. Decreases

B. Increases

C. Becomes zero

D. Remains necessarily unchanged

Answer: B. Increases

Question 6

In a series circuit, the same quantity through each resistor is:

A. Potential difference

B. Current

C. Resistance

D. Power

Answer: B. Current

Question 7

In a parallel combination, the same quantity across each branch is:

A. Current

B. Resistance

C. Potential difference

D. Charge

Answer: C. Potential difference

Question 8

Electrical power can be expressed as:

A. P=VI

B. P=V/I

C. P=IR

D. P=R/I

Answer: A. P=VI

Physics Quick Revision

Remember these key relations:

[ I=\frac{Q}{t} ]

[ V=\frac{W}{Q} ]

[ V=IR ]

[ R=\rho\frac{L}{A} ]

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

Memory Chain

Charge → Current → Potential Difference → Resistance → Power

🟢 CHEMISTRY

ALCOHOLS, PHENOLS AND ETHERS

Alcohols, phenols and ethers are important oxygen-containing organic compounds.

Alcohols

Alcohols contain a hydroxyl group (-OH) attached to a saturated carbon atom.

General representation:

[ R-OH ]

Example:

[ CH_3OH ]

Methanol is an alcohol.

Another example:

[ C_2H_5OH ]

Ethanol.

Phenols

In phenols, the hydroxyl group is directly attached to an aromatic ring.

The simplest example is phenol:

[ C_6H_5OH ]

Important distinction

Alcohol: -OH attached to saturated carbon.

Phenol: -OH directly attached to aromatic ring.

This distinction is frequently useful in organic chemistry questions.

Ethers

Ethers contain an oxygen atom connected to two carbon-containing groups.

General structure:

[ R-O-R' ]

Example:

[ CH_3-O-CH_3 ]

This is dimethyl ether.

Hydrogen Bonding

Alcohols and phenols can form hydrogen bonds because of their -OH group.

Hydrogen bonding affects several physical properties, including boiling point and solubility.

Acidity of Phenol

Phenol is more acidic than ordinary alcohols.

One important reason is the stabilization of the phenoxide ion through resonance.

Conceptually:

Phenol → Phenoxide ion → Resonance stabilization

This is an important idea for understanding phenol acidity.

Ether Properties

Ethers generally have an oxygen atom between two carbon groups.

They can act as hydrogen-bond acceptors, but they do not have an -OH hydrogen for self hydrogen-bond donation like alcohols.

Chemistry MCQ Practice

Question 1

The functional group of alcohol is:

A. -COOH

B. -OH

C. -CHO

D. -NH_2

Answer: B. -OH

Question 2

Which compound is methanol?

A. CH_3OH

B. C_2H_5OH

C. CH_3COOH

D. CH_3CHO

Answer: A. CH_3OH

Question 3

Phenol contains:

A. -OH attached directly to an aromatic ring

B. -COOH attached to an aromatic ring

C. -NH_2 attached to an alkyl group

D. Ether oxygen only

Answer: A. -OH attached directly to an aromatic ring

Question 4

The general structure of an ether is:

A. R-O-R'

B. R-OH

C. R-COOH

D. R-NH_2

Answer: A. R-O-R'

Question 5

Which can form hydrogen bonds because of an -OH group?

A. Alcohols

B. Simple alkanes

C. Alkenes only

D. Alkynes only

Answer: A. Alcohols

Question 6

Phenol is generally:

A. More acidic than ordinary alcohols

B. Less acidic than all hydrocarbons

C. A strong mineral acid

D. A salt

Answer: A. More acidic than ordinary alcohols

Question 7

The formula CH_3-O-CH_3 represents:

A. Methanol

B. Dimethyl ether

C. Ethanol

D. Phenol

Answer: B. Dimethyl ether

Question 8

The increased acidity of phenol is significantly related to:

A. Phenoxide ion resonance stabilization

B. Absence of oxygen

C. Formation of metallic bonds

D. Nuclear instability

Answer: A. Phenoxide ion resonance stabilization

Chemistry Quick Revision

Alcohol

R–OH

Phenol

Ar–OH

Ether

R–O–R′

Important concept

Phenol → Phenoxide ion → Resonance stabilization → Greater acidity than ordinary alcohols

Memory Chain

Alcohol → OH on saturated carbon

Phenol → OH directly on aromatic ring

Ether → O between two carbon groups

🔴 BIOLOGY

PRINCIPLES OF INHERITANCE AND VARIATION

Genetics explains how characteristics are transmitted from parents to offspring and how variations arise.

One of the most important foundations of classical genetics is the work of Gregor Mendel.

Mendel's Experiments

Mendel performed experiments using pea plants.

He studied contrasting traits such as:

Tall vs dwarf

Round vs wrinkled seeds

Yellow vs green seeds

His experiments helped establish important principles of inheritance.

Gene and Allele

A gene is a functional unit of heredity associated with a particular characteristic.

Different forms of a gene are called alleles.

For example, a gene controlling a trait may have different allelic forms.

Dominant and Recessive

A dominant allele can express its effect in a heterozygous condition.

A recessive allele generally expresses its phenotype when present in the homozygous condition, under classical Mendelian inheritance.

Genotype and Phenotype

Genotype

The genetic constitution of an organism is its genotype.

Phenotype

The observable characteristics of an organism constitute its phenotype.

Memory Trick

Genotype = Genetic makeup

Phenotype = Physical/observable expression

Homozygous and Heterozygous

Homozygous

An individual is homozygous when the two alleles for a particular gene are the same.

Examples:

TT or tt

Heterozygous

An individual is heterozygous when the two alleles are different.

Example:

Tt

Mendel's Laws

Important classical Mendelian principles include:

Law of Dominance

In a heterozygote, one allele may express itself as dominant while the other is recessive.

Law of Segregation

Allelic pairs separate during gamete formation so that each gamete receives one allele.

Law of Independent Assortment

Alleles of different genes can assort independently under the conditions described by Mendelian inheritance.

Monohybrid Cross

Consider a cross:

[ TT\times tt ]

The F₁ generation is:

[ Tt ]

If F₁ individuals are crossed:

[ Tt\times Tt ]

The classical genotypic ratio is:

[ 1:2:1 ]

The classical phenotypic ratio for complete dominance is:

[ 3:1 ]

These ratios are highly important for basic genetics practice.

Variation

Variation means differences among individuals of a population.

Variation provides the raw material for evolutionary change.

Sources of variation include processes such as:

Mutation

Genetic recombination

Independent assortment

Crossing over

Biology MCQ Practice

Question 1

Who is widely known as the father of genetics?

A. Charles Darwin

B. Gregor Mendel

C. Watson

D. Lamarck

Answer: B. Gregor Mendel

Question 2

Mendel conducted his classical experiments mainly on:

A. Fruit flies

B. Pea plants

C. Bacteria

D. Maize only

Answer: B. Pea plants

Question 3

Different forms of the same gene are called:

A. Chromosomes

B. Alleles

C. Ribosomes

D. Enzymes

Answer: B. Alleles

Question 4

The genetic constitution of an organism is called:

A. Phenotype

B. Genotype

C. Variation

D. Mutation

Answer: B. Genotype

Question 5

The observable characteristics of an organism are called:

A. Genotype

B. Phenotype

C. Alleles

D. Gametes

Answer: B. Phenotype

Question 6

Which represents a heterozygous condition?

A. TT

B. tt

C. Tt

D. XX

Answer: C. Tt

Question 7

The classical phenotypic ratio of a monohybrid cross under complete dominance is:

A. 1:1

B. 1:2:1

C. 3:1

D. 9:3:3:1

Answer: C. 3:1

Question 8

The classical genotypic ratio of Tt\times Tt is:

A. 3:1

B. 1:1

C. 1:2:1

D. 9:3:3:1

Answer: C. 1:2:1

Biology Quick Revision

Genetics

Gene → Alleles → Genotype → Phenotype

Mendelian Cross

[ TT\times tt\rightarrow Tt ]

Then:

[ Tt\times Tt ]

Genotypic ratio:

1 : 2 : 1

Phenotypic ratio under complete dominance:

3 : 1

Important Terms

Homozygous → Same alleles

Heterozygous → Different alleles

Genotype → Genetic constitution

Phenotype → Observable characteristics

🧠 ACTIVE RECALL

Close your books and answer these without looking:

Physics

What is electric current?

What is the SI unit of current?

State Ohm's law.

What happens to resistance when conductor length increases?

What is the difference between series and parallel combinations?

Write the three useful forms of electrical power.

Chemistry

What is an alcohol?

What is a phenol?

What is an ether?

Why is phenol more acidic than ordinary alcohols?

Biology

Who performed the classical pea plant experiments?

What is an allele?

What is the difference between genotype and phenotype?

What is homozygous?

What is heterozygous?

What are the classical monohybrid ratios?

If you cannot answer immediately, do not worry.

That question has simply identified your next revision target.

🔍 CONCEPT CONNECTION

Try to connect today's concepts.

Physics

Charge → Current → Voltage → Resistance → Power

Chemistry

Functional group → Structure → Properties → Acidity/physical behaviour

Biology

Gene → Allele → Genotype → Phenotype → Inheritance → Variation

When concepts are connected, memorisation becomes more meaningful.

❌ ERROR ANALYSIS

Every wrong MCQ should teach you something.

Classify mistakes as:

1. Concept Error

You did not understand the principle.

2. Recall Error

You knew it previously but could not retrieve it.

3. Formula Error

You forgot or misused a formula.

4. Application Error

You understood the concept but could not apply it.

5. Careless Error

You knew the answer but made an avoidable mistake.

📖 ERROR LOG

Use:

Question → My Answer → Correct Answer → Why Wrong → Correct Concept → Revision Date

Example:

Question: Classical genotypic ratio of Tt\times Tt

My Answer: 3:1

Correct Answer: 1:2:1

Why Wrong: Confused genotypic and phenotypic ratios.

Correct Concept:

Genotype = 1:2:1

Phenotype = 3:1 under complete dominance.

This is exactly how a mistake can become a permanent learning point.

🔄 SMART REVISION STRATEGY

For today's three subjects:

Physics Revision

Memorise and understand:

[ I=\frac{Q}{t} ]

[ V=IR ]

[ R=\rho\frac{L}{A} ]

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

Chemistry Revision

Remember:

Alcohol = R–OH

Phenol = Ar–OH

Ether = R–O–R′

Biology Revision

Remember:

Gene → Allele → Genotype → Phenotype

and:

1:2:1 genotype

3:1 phenotype

🌱 MOTIVATION

My friend, never measure your preparation only by how many questions you got wrong.

Measure it by how many mistakes you understood and corrected.

A student who makes a mistake and analyses it carefully is learning.

A student who repeatedly makes the same mistake without analysing it is missing an opportunity.

So after every practice session, ask:

“What did this mistake teach me?”

Your preparation does not need to become perfect in one day.

It needs to become better, step by step.

One concept. One question. One correction. One revision. One step forward.

Your consistency today can become your confidence tomorrow. 🌱📚❤️

📚 SEVEN-STEP STUDY CYCLE

1. Read

Read the NCERT concept carefully.

2. Understand

Ask yourself what the concept actually means.

3. Recall

Close the book and reproduce it from memory.

4. Practise

Solve MCQs.

5. Analyse

Study every mistake.

6. Revise

Return to weak concepts.

7. Retest

Test yourself again after an interval.

⚠️ IMPORTANT NEET REMINDER

The questions in this Part 73 are independently prepared educational practice questions.

They are not:

Official NEET 2027 questions

An official NEET paper

An official prediction

A guarantee of what will appear in the examination

Use them as supplementary practice.

For serious preparation, prioritise:

Latest official syllabus + NCERT + PYQs + MCQs + Mock Tests + Revision + Error Analysis

Always verify the latest official examination information from the appropriate official sources.

📝 DISCLAIMER

This educational article has been independently prepared for NEET-oriented learning and practice.

It does not represent the official NEET 2027 question paper or an official prediction of examination questions.

No particular question is guaranteed to appear in NEET 2027.

Students should follow the latest official syllabus and examination information and use NCERT textbooks, previous-year questions and appropriate mock tests as major components of preparation.

⭐ KEY TAKEAWAYS

Physics

[ I=\frac{Q}{t} ]

[ V=IR ]

[ R=\rho\frac{L}{A} ]

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

Series → Same current

Parallel → Same potential difference

Chemistry

Alcohol → R–OH

Phenol → Ar–OH

Ether → R–O–R′

Phenol acidity → Phenoxide resonance stabilization

Biology

Gene → Allele

Genotype → Genetic constitution

Phenotype → Observable characteristics

Homozygous → Same alleles

Heterozygous → Different alleles

Monohybrid genotype ratio → 1:2:1

Monohybrid phenotype ratio → 3:1

✅ FINAL REVISION CHECK

Before finishing Part 73, ask yourself:

☐ Can I define electric current?

☐ Can I state Ohm's law?

☐ Can I use the resistance formula?

☐ Can I distinguish series and parallel combinations?

☐ Can I calculate electrical power using different forms?

☐ Can I distinguish alcohol, phenol and ether?

☐ Do I understand why phenol is more acidic than ordinary alcohols?

☐ Can I define gene and allele?

☐ Can I distinguish genotype and phenotype?

☐ Do I know homozygous and heterozygous conditions?

☐ Do I remember the 1:2:1 and 3:1 ratios?

☐ Have I recorded today's mistakes?

☐ Will I retest myself later?

If you can answer most of these confidently, today's work has moved your preparation forward.

🌟 CONCLUSION

NEET preparation is not built in a single day.

It is built through hundreds of small moments:

One page understood.

One formula remembered.

One MCQ solved.

One mistake corrected.

One concept revised.

One test repeated.

That is how preparation gradually becomes confidence.

Read → Understand → Recall → Practise → Analyse → Revise → Retest

And remember:

One Concept → One Question → One Correction → One Revision → One Step Forward.

Keep going, my friend. 🌱📚❤️

Written with AI