JEE Main MCQ & Objective Questions
The JEE Main exam is a crucial step for students aspiring to enter prestigious engineering colleges in India. It tests not only knowledge but also the ability to apply concepts effectively. Practicing MCQs and objective questions is essential for scoring better, as it helps in familiarizing students with the exam pattern and enhances their problem-solving skills. Engaging with practice questions allows students to identify important questions and strengthen their exam preparation.
What You Will Practise Here
Fundamental concepts of Physics, Chemistry, and Mathematics
Key formulas and their applications in problem-solving
Important definitions and theories relevant to JEE Main
Diagrams and graphical representations for better understanding
Numerical problems and their step-by-step solutions
Previous years' JEE Main questions for real exam experience
Time management strategies while solving MCQs
Exam Relevance
The topics covered in JEE Main are not only significant for the JEE exam but also appear in various CBSE and State Board examinations. Many concepts are shared with the NEET syllabus, making them relevant across multiple competitive exams. Common question patterns include conceptual applications, numerical problems, and theoretical questions that assess a student's understanding of core subjects.
Common Mistakes Students Make
Misinterpreting the question stem, leading to incorrect answers
Neglecting units in numerical problems, which can change the outcome
Overlooking negative marking and not managing time effectively
Relying too heavily on rote memorization instead of understanding concepts
Failing to review and analyze mistakes from practice tests
FAQs
Question: How can I improve my speed in solving JEE Main MCQ questions?Answer: Regular practice with timed quizzes and focusing on shortcuts can significantly enhance your speed.
Question: Are the JEE Main objective questions similar to previous years' papers?Answer: Yes, many questions are based on previous years' patterns, so practicing them can be beneficial.
Question: What is the best way to approach JEE Main practice questions?Answer: Start with understanding the concepts, then attempt practice questions, and finally review your answers to learn from mistakes.
Now is the time to take charge of your preparation! Dive into solving JEE Main MCQs and practice questions to test your understanding and boost your confidence for the exam.
Q. What is the main effect of heavy metal pollution in water bodies?
A.
Increased biodiversity
B.
Eutrophication
C.
Bioaccumulation
D.
Oxygenation
Show solution
Solution
Heavy metal pollution can lead to bioaccumulation in aquatic organisms, which can have harmful effects on the food chain.
Correct Answer:
C
— Bioaccumulation
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Q. What is the main environmental concern associated with the use of chlorofluorocarbons (CFCs)?
A.
Ozone layer depletion
B.
Global warming
C.
Acid rain
D.
Water pollution
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Solution
Chlorofluorocarbons (CFCs) are primarily known for their role in ozone layer depletion.
Correct Answer:
A
— Ozone layer depletion
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Q. What is the main feature of a primary alcohol?
A.
The hydroxyl group is attached to a carbon with one alkyl group
B.
The hydroxyl group is attached to a carbon with two alkyl groups
C.
The hydroxyl group is attached to a carbon with three alkyl groups
D.
The hydroxyl group is attached to a carbon in a ring
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Solution
A primary alcohol has the hydroxyl group (-OH) attached to a carbon atom that is bonded to only one other carbon atom.
Correct Answer:
A
— The hydroxyl group is attached to a carbon with one alkyl group
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Q. What is the main feature of addition polymerization?
A.
Involves the loss of small molecules
B.
Involves the addition of monomers without by-products
C.
Requires a catalyst
D.
Involves the formation of cross-linked structures
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Solution
Addition polymerization involves the addition of monomers to form a polymer without the loss of small molecules.
Correct Answer:
B
— Involves the addition of monomers without by-products
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Q. What is the main feature of addition polymers?
A.
They release small molecules during polymerization
B.
They are formed from monomers with double bonds
C.
They have a high degree of crystallinity
D.
They are always biodegradable
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Solution
Addition polymers are formed from monomers that contain double bonds, which open up to form long chains.
Correct Answer:
B
— They are formed from monomers with double bonds
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Q. What is the main feature of aromatic compounds?
A.
Presence of double bonds
B.
Presence of a benzene ring
C.
Presence of hydroxyl groups
D.
Presence of carboxylic groups
Show solution
Solution
Aromatic compounds are characterized by the presence of a benzene ring.
Correct Answer:
B
— Presence of a benzene ring
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Q. What is the main feature of condensation polymerization?
A.
It produces small molecules as byproducts
B.
It requires high temperatures
C.
It involves ionic bonds
D.
It is a reversible reaction
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Solution
Condensation polymerization produces small molecules, such as water, as byproducts.
Correct Answer:
A
— It produces small molecules as byproducts
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Q. What is the main feature of elastomers?
A.
High tensile strength
B.
Elasticity
C.
Brittleness
D.
Thermal stability
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Solution
Elastomers are characterized by their elasticity, allowing them to stretch and return to their original shape.
Correct Answer:
B
— Elasticity
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Q. What is the main feature of terminal alkynes?
A.
They have a triple bond in the middle
B.
They can form carbanions
C.
They are less acidic than alkenes
D.
They cannot undergo substitution reactions
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Solution
Terminal alkynes can form carbanions due to the acidity of the hydrogen atom attached to the sp-hybridized carbon.
Correct Answer:
B
— They can form carbanions
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Q. What is the main feature that distinguishes alkynes from alkenes?
A.
Presence of double bonds
B.
Presence of triple bonds
C.
Saturation
D.
Molecular weight
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Solution
Alkynes are distinguished from alkenes by the presence of triple bonds.
Correct Answer:
B
— Presence of triple bonds
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Q. What is the main function of a salt bridge in a galvanic cell?
A.
To provide a path for electrons
B.
To maintain charge balance
C.
To increase voltage
D.
To decrease resistance
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Solution
The main function of a salt bridge is to maintain charge balance by allowing ions to flow.
Correct Answer:
B
— To maintain charge balance
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Q. What is the main function of carbohydrates in living organisms?
A.
Genetic information
B.
Energy storage
C.
Catalysis
D.
Structural support
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Solution
The main function of carbohydrates is energy storage and providing energy to living organisms.
Correct Answer:
B
— Energy storage
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Q. What is the main function of lipids in biological systems?
A.
Energy storage
B.
Genetic information
C.
Catalysis
D.
Structural support
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Solution
Lipids primarily function in energy storage, as well as forming cell membranes.
Correct Answer:
A
— Energy storage
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Q. What is the main industrial method for producing hydrogen?
A.
Electrolysis of water
B.
Steam reforming of natural gas
C.
Thermal decomposition of water
D.
Photosynthesis
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Solution
The main industrial method for producing hydrogen is steam reforming of natural gas.
Correct Answer:
B
— Steam reforming of natural gas
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Q. What is the main ingredient in most sunscreens?
A.
Zinc oxide
B.
Vitamin E
C.
Aloe vera
D.
Coconut oil
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Solution
Zinc oxide is a common active ingredient in sunscreens that protects against UV rays.
Correct Answer:
A
— Zinc oxide
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Q. What is the main ingredient in vinegar that gives it its sour taste?
A.
Acetic acid
B.
Citric acid
C.
Lactic acid
D.
Formic acid
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Solution
Vinegar contains acetic acid, which is responsible for its sour taste.
Correct Answer:
A
— Acetic acid
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Q. What is the main ingredient in vinegar?
A.
Acetic acid
B.
Citric acid
C.
Lactic acid
D.
Formic acid
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Solution
Vinegar primarily consists of acetic acid, which gives it its sour taste.
Correct Answer:
A
— Acetic acid
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Q. What is the main mechanism of heat transfer in liquids and gases?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
Convection is the primary mechanism of heat transfer in liquids and gases due to the movement of the fluid.
Correct Answer:
B
— Convection
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Q. What is the main mechanism of heat transfer in liquids?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
In liquids, convection is the main mechanism of heat transfer, as the fluid moves and carries heat with it.
Correct Answer:
B
— Convection
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Q. What is the main monomer used to produce polyethylene?
A.
Propylene
B.
Ethylene
C.
Butylene
D.
Styrene
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Solution
Ethylene is the main monomer used to produce polyethylene through addition polymerization.
Correct Answer:
B
— Ethylene
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Q. What is the main product of nuclear fusion in stars?
A.
Helium
B.
Hydrogen
C.
Carbon
D.
Iron
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Solution
The main product of nuclear fusion in stars is helium.
Correct Answer:
A
— Helium
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Q. What is the main product of the complete combustion of alkanes?
A.
Carbon monoxide
B.
Carbon dioxide
C.
Water
D.
Oxygen
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Solution
The main products of the complete combustion of alkanes are carbon dioxide and water.
Correct Answer:
B
— Carbon dioxide
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Q. What is the main product of the complete combustion of hydrocarbons?
A.
Carbon monoxide
B.
Water
C.
Carbon dioxide
D.
Hydrogen gas
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Solution
The complete combustion of hydrocarbons produces carbon dioxide and water.
Correct Answer:
C
— Carbon dioxide
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Q. What is the main product of the complete combustion of propane (C3H8)?
A.
Carbon monoxide
B.
Carbon dioxide and water
C.
Soot
D.
Hydrogen gas
Show solution
Solution
The complete combustion of propane produces carbon dioxide and water.
Correct Answer:
B
— Carbon dioxide and water
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Q. What is the main product of the dehydration of an alcohol?
A.
Alkene
B.
Alkane
C.
Aldehyde
D.
Ketone
Show solution
Solution
The dehydration of an alcohol typically yields an alkene.
Correct Answer:
A
— Alkene
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Q. What is the main product of the dehydration of ethanol?
A.
Ethylene
B.
Acetaldehyde
C.
Ethane
D.
Diethyl ether
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Solution
The dehydration of ethanol primarily produces ethylene (ethene) through the elimination of water.
Correct Answer:
A
— Ethylene
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Q. What is the main product of the electrolysis of water?
A.
Hydrogen gas
B.
Oxygen gas
C.
Hydrochloric acid
D.
Hydrogen peroxide
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Solution
The main products of the electrolysis of water are hydrogen gas (H2) and oxygen gas (O2).
Correct Answer:
A
— Hydrogen gas
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Q. What is the main product of the hydrogenation of benzene?
A.
Cyclohexane
B.
Toluene
C.
Phenol
D.
Benzaldehyde
Show solution
Solution
The hydrogenation of benzene results in the formation of cyclohexane, a saturated hydrocarbon.
Correct Answer:
A
— Cyclohexane
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Q. What is the main product of the hydrolysis of an ester?
A.
Alcohol
B.
Carboxylic acid
C.
Alkene
D.
Ketone
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Solution
The hydrolysis of an ester produces a carboxylic acid and an alcohol.
Correct Answer:
B
— Carboxylic acid
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Q. What is the main product of the nitration of benzene?
A.
Nitrobenzene
B.
Benzene-1,2-diol
C.
Benzaldehyde
D.
Benzyl alcohol
Show solution
Solution
The nitration of benzene typically produces nitrobenzene as the main product through electrophilic substitution.
Correct Answer:
A
— Nitrobenzene
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