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 primary structural component of plant cell walls?
A.
Starch
B.
Glycogen
C.
Cellulose
D.
Chitin
Show solution
Solution
Cellulose is the primary structural component of plant cell walls, providing rigidity and strength.
Correct Answer:
C
— Cellulose
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Q. What is the primary structure of a polymer determined by?
A.
The arrangement of monomers
B.
The molecular weight
C.
The type of bonds
D.
The color of the polymer
Show solution
Solution
The primary structure of a polymer is determined by the arrangement of its monomers.
Correct Answer:
A
— The arrangement of monomers
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Q. What is the primary structure of a protein determined by?
A.
Hydrogen bonds
B.
Ionic bonds
C.
Peptide bonds
D.
Disulfide bridges
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Solution
The primary structure of a protein is determined by the sequence of amino acids linked by peptide bonds.
Correct Answer:
C
— Peptide bonds
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Q. What is the primary structure of a protein?
A.
The sequence of amino acids
B.
The folding of the polypeptide chain
C.
The arrangement of multiple polypeptide chains
D.
The interaction between side chains
Show solution
Solution
The primary structure of a protein refers to the linear sequence of amino acids in the polypeptide chain.
Correct Answer:
A
— The sequence of amino acids
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Q. What is the primary type of bonding in diamond?
A.
Ionic
B.
Covalent
C.
Metallic
D.
Hydrogen
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Solution
Diamond consists of a three-dimensional network of covalent bonds between carbon atoms.
Correct Answer:
B
— Covalent
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Q. What is the primary type of bonding in ionic compounds?
A.
Covalent bonding
B.
Ionic bonding
C.
Metallic bonding
D.
Hydrogen bonding
Show solution
Solution
Ionic compounds are primarily held together by ionic bonding.
Correct Answer:
B
— Ionic bonding
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Q. What is the primary type of bonding in polymers?
A.
Ionic bonding
B.
Covalent bonding
C.
Metallic bonding
D.
Hydrogen bonding
Show solution
Solution
Covalent bonding is the primary type of bonding in polymers, linking monomers together.
Correct Answer:
B
— Covalent bonding
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Q. What is the primary type of bonding in sodium chloride (NaCl)?
A.
Covalent
B.
Ionic
C.
Metallic
D.
Hydrogen
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Solution
Sodium chloride is primarily held together by ionic bonds formed between Na+ and Cl- ions.
Correct Answer:
B
— Ionic
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Q. What is the primary type of decay for an unstable nucleus with too many protons?
A.
Alpha decay
B.
Beta decay
C.
Gamma decay
D.
Positron emission
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Solution
An unstable nucleus with too many protons typically undergoes alpha decay, where it emits an alpha particle (2 protons and 2 neutrons) to become more stable.
Correct Answer:
A
— Alpha decay
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Q. What is the primary type of radiation emitted by uranium-238?
A.
Alpha radiation
B.
Beta radiation
C.
Gamma radiation
D.
X-rays
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Solution
Uranium-238 primarily emits alpha radiation during its decay process.
Correct Answer:
A
— Alpha radiation
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Q. What is the primary type of radiation emitted during alpha decay?
A.
Helium nucleus
B.
Electron
C.
Photon
D.
Neutrino
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Solution
During alpha decay, an alpha particle, which is a helium nucleus (2 protons and 2 neutrons), is emitted.
Correct Answer:
A
— Helium nucleus
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Q. What is the primary type of reaction that alkanes undergo?
A.
Addition
B.
Substitution
C.
Elimination
D.
Condensation
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Solution
Alkanes primarily undergo substitution reactions.
Correct Answer:
B
— Substitution
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Q. What is the primary use of a Wheatstone bridge in practical applications?
A.
To measure voltage
B.
To measure current
C.
To measure resistance
D.
To measure power
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Solution
The primary use of a Wheatstone bridge is to measure unknown resistances by balancing it against known resistances.
Correct Answer:
C
— To measure resistance
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Q. What is the primary use of amines in industry?
A.
Solvents
B.
Fertilizers
C.
Dyes
D.
All of the above
Show solution
Solution
Amines are used in various industries for solvents, fertilizers, dyes, and more.
Correct Answer:
D
— All of the above
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Q. What is the primary use of antihistamines?
A.
To treat infections
B.
To relieve allergy symptoms
C.
To reduce fever
D.
To promote sleep
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Solution
Antihistamines are primarily used to relieve symptoms of allergies.
Correct Answer:
B
— To relieve allergy symptoms
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Q. What is the primary use of baking soda in cooking?
A.
Flavor enhancer
B.
Leavening agent
C.
Preservative
D.
Coloring agent
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Solution
Baking soda acts as a leavening agent, helping baked goods rise by producing carbon dioxide when reacting with acids.
Correct Answer:
B
— Leavening agent
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Q. What is the primary use of barium sulfate?
A.
As a contrast agent in X-ray imaging
B.
In fireworks
C.
As a fertilizer
D.
In batteries
Show solution
Solution
Barium sulfate is primarily used as a contrast agent in X-ray imaging.
Correct Answer:
A
— As a contrast agent in X-ray imaging
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Q. What is the primary use of boron in industry?
A.
Fertilizers
B.
Glass production
C.
Metallurgy
D.
Pharmaceuticals
Show solution
Solution
Boron is primarily used in glass production due to its ability to improve thermal and chemical resistance.
Correct Answer:
B
— Glass production
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Q. What is the primary use of calcium in the industry?
A.
As a reducing agent
B.
In the production of cement
C.
In batteries
D.
As a fertilizer
Show solution
Solution
Calcium is primarily used in the production of cement.
Correct Answer:
B
— In the production of cement
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Q. What is the primary use of chlorine in water treatment?
A.
To increase pH
B.
To remove hardness
C.
As a disinfectant
D.
To add minerals
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Solution
Chlorine is primarily used as a disinfectant in water treatment.
Correct Answer:
C
— As a disinfectant
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Q. What is the primary use of citric acid in food?
A.
Preservative
B.
Flavor enhancer
C.
Thickener
D.
Coloring agent
Show solution
Solution
Citric acid is commonly used as a flavor enhancer in food products.
Correct Answer:
B
— Flavor enhancer
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Q. What is the primary use of ethanol in everyday life?
A.
Fuel
B.
Solvent
C.
Antiseptic
D.
All of the above
Show solution
Solution
Ethanol is used as a fuel, solvent, and antiseptic in various applications.
Correct Answer:
D
— All of the above
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Q. What is the primary use of hydrogen in the industry?
A.
Fertilizers
B.
Fuel cells
C.
Plastics
D.
Glass production
Show solution
Solution
Hydrogen is primarily used in fuel cells for energy production.
Correct Answer:
B
— Fuel cells
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Q. What is the primary use of nuclear fission in power plants?
A.
To produce nuclear weapons
B.
To generate heat for electricity
C.
To create isotopes for medical use
D.
To study nuclear reactions
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Solution
Nuclear fission is primarily used in power plants to generate heat, which is then converted into electricity.
Correct Answer:
B
— To generate heat for electricity
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Q. What is the primary use of nuclear fission?
A.
Medical imaging
B.
Nuclear power generation
C.
Smoke detectors
D.
Radiocarbon dating
Show solution
Solution
Nuclear fission is primarily used for nuclear power generation.
Correct Answer:
B
— Nuclear power generation
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Q. What is the primary use of nuclear reactors?
A.
To produce nuclear weapons
B.
To generate electricity
C.
To create isotopes for medical use
D.
To study nuclear physics
Show solution
Solution
The primary use of nuclear reactors is to generate electricity through controlled nuclear fission.
Correct Answer:
B
— To generate electricity
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Q. What is the primary use of polarizers in photography?
A.
To increase brightness
B.
To reduce glare
C.
To enhance colors
D.
To focus light
Show solution
Solution
Polarizers are primarily used in photography to reduce glare from reflective surfaces.
Correct Answer:
B
— To reduce glare
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Q. What is the primary use of potassium in agriculture?
A.
Fertilizer
B.
Pesticide
C.
Herbicide
D.
Soil conditioner
Show solution
Solution
Potassium is primarily used as a fertilizer in agriculture.
Correct Answer:
A
— Fertilizer
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Q. What is the primary use of radioactive isotopes in medicine?
A.
Energy production
B.
Diagnostic imaging
C.
Food preservation
D.
Industrial applications
Show solution
Solution
Radioactive isotopes are primarily used in medicine for diagnostic imaging and treatment.
Correct Answer:
B
— Diagnostic imaging
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Q. What is the primary use of silicon in the industry?
A.
Fertilizers
B.
Semiconductors
C.
Glass production
D.
Alloys
Show solution
Solution
Silicon is primarily used in the semiconductor industry.
Correct Answer:
B
— Semiconductors
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