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 function of antacids?
A.
To relieve pain
B.
To reduce acidity
C.
To increase appetite
D.
To promote digestion
Show solution
Solution
Antacids are used to neutralize stomach acidity and relieve heartburn.
Correct Answer:
B
— To reduce acidity
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Q. What is the primary function of baking soda in cooking?
A.
Thickening agent
B.
Leavening agent
C.
Flavor enhancer
D.
Preservative
Show solution
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 function of carbohydrates in living organisms?
A.
Energy storage
B.
Genetic information
C.
Catalysis
D.
Structural support
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Solution
Carbohydrates primarily serve as a source of energy in living organisms.
Correct Answer:
A
— Energy storage
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Q. What is the primary function of emulsifiers in food products?
A.
Thickeners
B.
Stabilizers
C.
Flavor enhancers
D.
Coloring agents
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Solution
Emulsifiers help stabilize mixtures of oil and water, preventing separation.
Correct Answer:
B
— Stabilizers
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Q. What is the primary function of enzymes in biological systems?
A.
Store energy
B.
Speed up chemical reactions
C.
Provide structural support
D.
Transport molecules
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Solution
Enzymes act as catalysts to speed up chemical reactions in biological systems.
Correct Answer:
B
— Speed up chemical reactions
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Q. What is the primary function of enzymes?
A.
Store energy
B.
Speed up chemical reactions
C.
Provide structure
D.
Transport substances
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Solution
Enzymes are biological catalysts that speed up chemical reactions in the body.
Correct Answer:
B
— Speed up chemical reactions
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Q. What is the primary function of fluoride in dental care products?
A.
Whitening teeth
B.
Preventing cavities
C.
Freshening breath
D.
Strengthening gums
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Solution
Fluoride helps to prevent cavities by strengthening tooth enamel and making it more resistant to decay.
Correct Answer:
B
— Preventing cavities
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Q. What is the primary function of fluoride in dental care?
A.
Whitening teeth
B.
Preventing cavities
C.
Strengthening enamel
D.
Reducing sensitivity
Show solution
Solution
Fluoride helps to strengthen tooth enamel and prevent cavities.
Correct Answer:
C
— Strengthening enamel
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Q. What is the primary function of lipids in biological systems?
A.
Energy storage
B.
Catalysis
C.
Genetic information
D.
Structural support
Show solution
Solution
Lipids serve as a major form of energy storage in organisms.
Correct Answer:
A
— Energy storage
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Q. What is the primary function of preservatives in food?
A.
Enhance flavor
B.
Improve texture
C.
Prevent spoilage
D.
Increase nutritional value
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Solution
Preservatives are added to food to prevent spoilage caused by microorganisms.
Correct Answer:
C
— Prevent spoilage
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Q. What is the primary function of soap in cleaning?
A.
Disinfecting
B.
Emulsifying
C.
Oxidizing
D.
Reducing
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Solution
Soap acts as an emulsifier, allowing water to mix with oils and dirt for effective cleaning.
Correct Answer:
B
— Emulsifying
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Q. What is the primary greenhouse gas emitted through human activities?
A.
Carbon Dioxide
B.
Methane
C.
Nitrous Oxide
D.
Ozone
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Solution
Carbon Dioxide (CO2) is the primary greenhouse gas emitted through human activities, particularly from the burning of fossil fuels.
Correct Answer:
A
— Carbon Dioxide
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Q. What is the primary intermolecular force present in gases?
A.
Hydrogen bonding
B.
Dipole-dipole interactions
C.
London dispersion forces
D.
Ionic bonding
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Solution
London dispersion forces are the primary intermolecular forces in gases, as they are weak and allow for greater movement.
Correct Answer:
C
— London dispersion forces
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Q. What is the primary intermolecular force present in liquid water?
A.
Ionic bonds
B.
Covalent bonds
C.
Hydrogen bonds
D.
Van der Waals forces
Show solution
Solution
Water molecules are held together primarily by hydrogen bonds.
Correct Answer:
C
— Hydrogen bonds
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Q. What is the primary intermolecular force present in liquids?
A.
Ionic bonds
B.
Covalent bonds
C.
Dispersion forces
D.
Dipole-dipole interactions
Show solution
Solution
Liquids primarily exhibit dipole-dipole interactions due to the presence of polar molecules.
Correct Answer:
D
— Dipole-dipole interactions
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Q. What is the primary intermolecular force present in water?
A.
Ionic bonds
B.
Covalent bonds
C.
Hydrogen bonds
D.
Van der Waals forces
Show solution
Solution
Water exhibits hydrogen bonding due to the presence of O-H bonds.
Correct Answer:
C
— Hydrogen bonds
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Q. What is the primary mechanism of adsorption in physisorption?
A.
Chemical bonding
B.
Van der Waals forces
C.
Hydrogen bonding
D.
Ionic bonding
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Solution
Physisorption occurs primarily due to weak Van der Waals forces.
Correct Answer:
B
— Van der Waals forces
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Q. What is the primary mechanism of current flow in semiconductors?
A.
Electron flow only
B.
Hole flow only
C.
Both electron and hole flow
D.
Ionic flow
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Solution
Current flow in semiconductors occurs due to the movement of both electrons and holes.
Correct Answer:
C
— Both electron and hole flow
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Q. What is the primary mechanism of heat transfer in a vacuum?
A.
Conduction
B.
Convection
C.
Radiation
D.
None of the above
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Solution
In a vacuum, heat transfer occurs primarily through radiation, as there are no particles to conduct or convect heat.
Correct Answer:
C
— Radiation
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Q. What is the primary mechanism of heat transfer in liquids and gases?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
In liquids and gases, convection is the primary mechanism of heat transfer, as it involves the movement of fluid.
Correct Answer:
B
— Convection
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Q. What is the primary mechanism of heat transfer in liquids?
A.
Conduction
B.
Convection
C.
Radiation
D.
All of the above
Show solution
Solution
In liquids, convection is the primary mechanism of heat transfer, although conduction and radiation can also occur.
Correct Answer:
B
— Convection
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Q. What is the primary method for reducing carbon emissions in urban areas?
A.
Increasing fossil fuel use
B.
Promoting public transportation
C.
Encouraging deforestation
D.
Reducing recycling efforts
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Solution
Promoting public transportation is a primary method for reducing carbon emissions in urban areas.
Correct Answer:
B
— Promoting public transportation
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Q. What is the primary method for treating wastewater?
A.
Filtration
B.
Chlorination
C.
Biological treatment
D.
Incineration
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Solution
Biological treatment is the primary method for treating wastewater, utilizing microorganisms to break down organic matter.
Correct Answer:
C
— Biological treatment
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Q. What is the primary method of heat transfer from the Sun to the Earth?
A.
Conduction
B.
Convection
C.
Radiation
D.
Conduction and Convection
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Solution
The primary method of heat transfer from the Sun to the Earth is radiation, as it travels through the vacuum of space.
Correct Answer:
C
— Radiation
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Q. What is the primary method of reducing carbon emissions in transportation?
A.
Switching to electric vehicles
B.
Increasing fossil fuel use
C.
Using more plastic
D.
Reducing public transport
Show solution
Solution
Switching to electric vehicles is a primary method of reducing carbon emissions in transportation.
Correct Answer:
A
— Switching to electric vehicles
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Q. What is the primary method of treating wastewater?
A.
Incineration
B.
Filtration
C.
Biological treatment
D.
Chemical treatment
Show solution
Solution
Biological treatment is a common method for treating wastewater, utilizing microorganisms to break down organic matter.
Correct Answer:
C
— Biological treatment
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Q. What is the primary method used to treat wastewater?
A.
Filtration
B.
Sedimentation
C.
Biological treatment
D.
Chemical treatment
Show solution
Solution
Biological treatment is the primary method used to treat wastewater, utilizing microorganisms to break down organic matter.
Correct Answer:
C
— Biological treatment
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Q. What is the primary mode of heat transfer from the Sun to the Earth?
A.
Conduction
B.
Convection
C.
Radiation
D.
Conduction and Convection
Show solution
Solution
The primary mode of heat transfer from the Sun to the Earth is radiation, as it travels through the vacuum of space.
Correct Answer:
C
— Radiation
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Q. What is the primary mode of heat transfer in a vacuum?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
Show solution
Solution
In a vacuum, there are no particles to conduct or convect heat, so radiation is the only mode of heat transfer.
Correct Answer:
C
— Radiation
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Q. What is the primary mode of heat transfer in liquids and gases?
A.
Conduction
B.
Convection
C.
Radiation
D.
None of the above
Show solution
Solution
Convection is the primary mode of heat transfer in liquids and gases due to the movement of the fluid.
Correct Answer:
B
— Convection
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