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. Which of the following is a correct statement about the law of conservation of mass?
A.
Mass can be created
B.
Mass can be destroyed
C.
Mass is conserved in a chemical reaction
D.
Mass changes in a physical change
Show solution
Solution
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
Correct Answer:
C
— Mass is conserved in a chemical reaction
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Q. Which of the following is a correct unit for concentration?
A.
Molarity
B.
Molality
C.
Mass percent
D.
All of the above
Show solution
Solution
All listed options are valid units for concentration.
Correct Answer:
D
— All of the above
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Q. Which of the following is a correct unit for Gibbs Free Energy?
A.
Joules per mole (J/mol)
B.
Kilojoules (kJ)
C.
Calories (cal)
D.
All of the above
Show solution
Solution
Gibbs Free Energy can be expressed in various units, including Joules per mole, kilojoules, and calories.
Correct Answer:
D
— All of the above
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Q. Which of the following is a correct unit for molality?
A.
mol/L
B.
mol/kg
C.
mol/mL
D.
mol/1000g
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Solution
Molality is defined as moles of solute per kilogram of solvent, hence the unit is mol/kg.
Correct Answer:
B
— mol/kg
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Q. Which of the following is a derivative of benzene?
A.
Ethylene
B.
Acetylene
C.
Phenol
D.
Propylene
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Solution
Phenol is a derivative of benzene, where one hydrogen atom is replaced by a hydroxyl group (-OH).
Correct Answer:
C
— Phenol
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Q. Which of the following is a derivative of carboxylic acid?
A.
Alcohol
B.
Aldehyde
C.
Ester
D.
Alkane
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Solution
Ester is a derivative of carboxylic acid formed by the reaction of an acid with an alcohol.
Correct Answer:
C
— Ester
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Q. Which of the following is a derived unit?
A.
Meter
B.
Kilogram
C.
Second
D.
Newton
Show solution
Solution
Newton is a derived unit as it is defined in terms of the base units: 1 N = 1 kg·m/s².
Correct Answer:
D
— Newton
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Q. Which of the following is a dicarboxylic acid?
A.
Acetic acid
B.
Oxalic acid
C.
Formic acid
D.
Butanoic acid
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Solution
Oxalic acid (C2H2O4) is a dicarboxylic acid as it contains two carboxylic acid groups.
Correct Answer:
B
— Oxalic acid
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Q. Which of the following is a disaccharide?
A.
Fructose
B.
Maltose
C.
Glucose
D.
Glycogen
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Solution
Maltose is a disaccharide composed of two glucose units.
Correct Answer:
B
— Maltose
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Q. Which of the following is a disadvantage of frequency modulation (FM) compared to amplitude modulation (AM)?
A.
Higher bandwidth requirement
B.
More susceptible to noise
C.
Lower fidelity
D.
Easier to demodulate
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Solution
FM requires a larger bandwidth than AM, which can be a disadvantage in certain communication systems.
Correct Answer:
A
— Higher bandwidth requirement
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Q. Which of the following is a disadvantage of Frequency Modulation (FM)?
A.
Less bandwidth
B.
More noise immunity
C.
Complex receiver design
D.
Simple implementation
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Solution
FM requires a more complex receiver design compared to AM.
Correct Answer:
C
— Complex receiver design
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Q. Which of the following is a family of exponential curves?
A.
y = e^x
B.
y = x^2
C.
y = log(x)
D.
y = sin(x)
Show solution
Solution
The equation y = e^x represents a family of exponential curves for different bases.
Correct Answer:
A
— y = e^x
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Q. Which of the following is a function of carbohydrates?
A.
Energy source
B.
Hormone production
C.
Genetic coding
D.
Cell membrane structure
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Solution
Carbohydrates primarily serve as an energy source for living organisms.
Correct Answer:
A
— Energy source
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Q. Which of the following is a function of lipids?
A.
Energy storage
B.
Catalysis
C.
Genetic information
D.
Structural support
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Solution
Lipids are primarily used for energy storage in organisms.
Correct Answer:
A
— Energy storage
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Q. Which of the following is a function of proteins in the body?
A.
Energy storage
B.
Hormonal regulation
C.
Transport of molecules
D.
All of the above
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Solution
Proteins serve multiple functions in the body, including energy storage, hormonal regulation, and transport of molecules.
Correct Answer:
D
— All of the above
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Q. Which of the following is a function of proteins?
A.
Energy storage
B.
Hormonal regulation
C.
Genetic information
D.
Cell membrane structure
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Solution
Proteins play a crucial role in hormonal regulation among other functions.
Correct Answer:
B
— Hormonal regulation
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Q. Which of the following is a good conductor of heat?
A.
Wood
B.
Plastic
C.
Copper
D.
Glass
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Solution
Copper is a good conductor of heat.
Correct Answer:
C
— Copper
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Q. Which of the following is a heavy metal that can cause environmental pollution?
A.
Iron
B.
Lead
C.
Calcium
D.
Sodium
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Solution
Lead is a heavy metal that can accumulate in the environment and is toxic to living organisms.
Correct Answer:
B
— Lead
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Q. Which of the following is a heavy metal that poses environmental hazards?
A.
Sodium
B.
Calcium
C.
Lead
D.
Potassium
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Solution
Lead is a heavy metal that poses significant environmental and health hazards.
Correct Answer:
C
— Lead
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Q. Which of the following is a hydrogen compound that acts as a reducing agent?
A.
H2O
B.
H2S
C.
HCl
D.
H2O2
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Solution
Hydrogen sulfide (H2S) acts as a reducing agent.
Correct Answer:
B
— H2S
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Q. Which of the following is a hydrogen compound?
A.
H2O
B.
CO2
C.
NaCl
D.
O2
Show solution
Solution
Water (H2O) is a compound that contains hydrogen.
Correct Answer:
A
— H2O
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Q. Which of the following is a ketone?
A.
Propionaldehyde
B.
Butanal
C.
Acetone
D.
Formaldehyde
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Solution
Acetone (CH3COCH3) is a ketone.
Correct Answer:
C
— Acetone
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Q. Which of the following is a lanthanide element?
A.
Cerium
B.
Zirconium
C.
Titanium
D.
Vanadium
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Solution
Cerium is a lanthanide element, while the others are transition metals.
Correct Answer:
A
— Cerium
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Q. Which of the following is a limitation of Raoult's Law?
A.
It applies to all solutions.
B.
It is valid for ideal solutions only.
C.
It does not consider temperature effects.
D.
It is applicable to non-volatile solutes only.
Show solution
Solution
Raoult's Law is primarily valid for ideal solutions, where the interactions between molecules are similar to those in the pure components.
Correct Answer:
B
— It is valid for ideal solutions only.
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Q. Which of the following is a lipid?
A.
Starch
B.
Cholesterol
C.
Cellulose
D.
Glucose
Show solution
Solution
Cholesterol is a type of lipid, while starch, cellulose, and glucose are carbohydrates.
Correct Answer:
B
— Cholesterol
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Q. Which of the following is a longitudinal wave?
A.
Light wave
B.
Sound wave
C.
Water wave
D.
Radio wave
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Solution
Sound waves are longitudinal waves, where particle displacement is parallel to wave direction.
Correct Answer:
B
— Sound wave
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Q. Which of the following is a major contributor to global warming?
A.
Ozone
B.
Methane
C.
Nitrogen
D.
Argon
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Solution
Methane is a potent greenhouse gas that significantly contributes to global warming.
Correct Answer:
B
— Methane
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Q. Which of the following is a major contributor to the depletion of the ozone layer?
A.
Carbon dioxide
B.
Chlorofluorocarbons (CFCs)
C.
Methane
D.
Nitrous oxide
Show solution
Solution
Chlorofluorocarbons (CFCs) are major contributors to the depletion of the ozone layer, leading to increased UV radiation.
Correct Answer:
B
— Chlorofluorocarbons (CFCs)
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Q. Which of the following is a major source of sulfur dioxide in the atmosphere?
A.
Volcanic eruptions
B.
Automobile emissions
C.
Industrial processes
D.
All of the above
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Solution
Sulfur dioxide (SO2) is released from various sources including volcanic eruptions, automobile emissions, and industrial processes.
Correct Answer:
D
— All of the above
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Q. Which of the following is a measure of the average kinetic energy of particles in a substance?
A.
Heat
B.
Temperature
C.
Thermal energy
D.
Latent heat
Show solution
Solution
Temperature is a measure of the average kinetic energy of particles in a substance.
Correct Answer:
B
— Temperature
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