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 chemical is commonly found in household bleach?
A.
Hydrogen peroxide
B.
Sodium hypochlorite
C.
Ammonium hydroxide
D.
Calcium hypochlorite
Show solution
Solution
Sodium hypochlorite is the active ingredient in most household bleach products.
Correct Answer:
B
— Sodium hypochlorite
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Q. Which chemical is commonly used as a food preservative?
A.
Sodium chloride
B.
Sodium benzoate
C.
Vinegar
D.
Sugar
Show solution
Solution
Sodium benzoate is a widely used food preservative that inhibits the growth of bacteria and fungi.
Correct Answer:
B
— Sodium benzoate
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Q. Which chemical is commonly used to treat drinking water?
A.
Chlorine
B.
Fluoride
C.
Sodium bicarbonate
D.
Sulfuric acid
Show solution
Solution
Chlorine is commonly used to disinfect drinking water and kill harmful bacteria.
Correct Answer:
A
— Chlorine
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Q. Which chemical is primarily responsible for ozone depletion?
A.
Carbon Dioxide
B.
Chlorofluorocarbons (CFCs)
C.
Methane
D.
Sulfur Dioxide
Show solution
Solution
Chlorofluorocarbons (CFCs) are primarily responsible for ozone depletion in the stratosphere.
Correct Answer:
B
— Chlorofluorocarbons (CFCs)
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Q. Which chemical is primarily responsible for the depletion of the ozone layer?
A.
Carbon Dioxide
B.
Chlorofluorocarbons (CFCs)
C.
Methane
D.
Sulfur Dioxide
Show solution
Solution
Chlorofluorocarbons (CFCs) are responsible for the depletion of the ozone layer, as they release chlorine atoms that destroy ozone molecules.
Correct Answer:
B
— Chlorofluorocarbons (CFCs)
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Q. Which colligative property can be used to determine the molar mass of a solute?
A.
Vapor pressure lowering
B.
Boiling point elevation
C.
Freezing point depression
D.
All of the above
Show solution
Solution
All of these colligative properties can be used to determine the molar mass of a solute.
Correct Answer:
D
— All of the above
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Q. Which colligative property is affected by the presence of electrolytes?
A.
Vapor pressure lowering
B.
Boiling point elevation
C.
Freezing point depression
D.
All of the above
Show solution
Solution
Electrolytes dissociate into ions, affecting all colligative properties by increasing the number of solute particles.
Correct Answer:
D
— All of the above
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Q. Which colligative property is used to determine molar mass of a solute?
A.
Boiling point elevation
B.
Freezing point depression
C.
Osmotic pressure
D.
All of the above
Show solution
Solution
All of these colligative properties can be used to determine the molar mass of a solute by applying the appropriate formulas.
Correct Answer:
D
— All of the above
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Q. Which colligative property is used to determine the molar mass of a solute?
A.
Boiling point elevation
B.
Freezing point depression
C.
Osmotic pressure
D.
All of the above
Show solution
Solution
All of the listed colligative properties can be used to determine the molar mass of a solute.
Correct Answer:
D
— All of the above
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Q. Which compound can exhibit both structural and geometric isomerism?
A.
C2H4
B.
C4H8
C.
C5H10
D.
C3H6
Show solution
Solution
C4H8 can exhibit both structural isomerism (different structures) and geometric isomerism (cis/trans forms).
Correct Answer:
B
— C4H8
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Q. Which compound does NOT exhibit optical isomerism?
A.
Lactic acid
B.
Glucose
C.
2-butanol
D.
Butan-2-one
Show solution
Solution
Butan-2-one does not have a chiral center and therefore does not exhibit optical isomerism.
Correct Answer:
D
— Butan-2-one
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Q. Which compound exhibits optical isomerism?
A.
2-butanol
B.
1-butanol
C.
Cyclohexane
D.
Ethylene
Show solution
Solution
2-butanol has a chiral center and can exist as two enantiomers, thus exhibiting optical isomerism.
Correct Answer:
A
— 2-butanol
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Q. Which compound is commonly used as a preservative in food?
A.
Sodium chloride
B.
Sodium benzoate
C.
Potassium nitrate
D.
Calcium carbonate
Show solution
Solution
Sodium benzoate is widely used as a food preservative to prevent spoilage.
Correct Answer:
B
— Sodium benzoate
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Q. Which device utilizes the p-n junction principle?
A.
Resistor
B.
Capacitor
C.
Diode
D.
Inductor
Show solution
Solution
A diode is a semiconductor device that utilizes the p-n junction principle to allow current to flow in one direction.
Correct Answer:
C
— Diode
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Q. Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p1?
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Solution
The element with the configuration 1s2 2s2 2p6 3s2 3p1 is Aluminum (Al).
Correct Answer:
A
— Al
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Q. Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?
A.
Arsenic
B.
Calcium
C.
Krypton
D.
Titanium
Show solution
Solution
The configuration corresponds to Krypton (Kr), which has 36 electrons.
Correct Answer:
C
— Krypton
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Q. Which enzyme breaks down starch into glucose?
A.
Amylase
B.
Lactase
C.
Sucrase
D.
Cellulase
Show solution
Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into glucose.
Correct Answer:
A
— Amylase
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Q. Which enzyme is responsible for the hydrolysis of starch?
A.
Amylase
B.
Cellulase
C.
Lactase
D.
Maltase
Show solution
Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into sugars.
Correct Answer:
A
— Amylase
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Q. Which equation is used to calculate the viscosity of a fluid in a capillary tube?
A.
Bernoulli's equation
B.
Poiseuille's law
C.
Navier-Stokes equation
D.
Continuity equation
Show solution
Solution
Poiseuille's law is used to calculate the viscosity of a fluid in a capillary tube.
Correct Answer:
B
— Poiseuille's law
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Q. Which equation is used to calculate the viscosity of a fluid in a pipe?
A.
Bernoulli's equation
B.
Poiseuille's law
C.
Continuity equation
D.
Navier-Stokes equation
Show solution
Solution
Poiseuille's law is used to calculate the viscosity of a fluid in a pipe.
Correct Answer:
B
— Poiseuille's law
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Q. Which equation relates the viscosity of a fluid to the flow rate in a capillary tube?
A.
Bernoulli's equation
B.
Poiseuille's law
C.
Continuity equation
D.
Ideal gas law
Show solution
Solution
Poiseuille's law describes the flow of a viscous fluid through a capillary tube and relates viscosity to flow rate.
Correct Answer:
B
— Poiseuille's law
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Q. Which f-block element is known for its use in nuclear reactors?
A.
Thorium
B.
Cerium
C.
Neodymium
D.
Gadolinium
Show solution
Solution
Thorium (Th) is used in nuclear reactors due to its ability to breed fissile uranium-233.
Correct Answer:
A
— Thorium
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Q. Which factor does NOT affect the Gibbs Free Energy of a reaction?
A.
Temperature
B.
Pressure
C.
Concentration of reactants
D.
Nature of the solvent
Show solution
Solution
The nature of the solvent does not directly affect the Gibbs Free Energy of a reaction; it is primarily influenced by temperature, pressure, and concentration.
Correct Answer:
D
— Nature of the solvent
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Q. Which factor does NOT affect the Gibbs Free Energy of a system?
A.
Temperature
B.
Pressure
C.
Concentration of reactants
D.
Nature of the solvent
Show solution
Solution
While temperature, pressure, and concentration of reactants affect Gibbs Free Energy, the nature of the solvent does not directly affect ΔG.
Correct Answer:
D
— Nature of the solvent
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Q. Which functional group is present in alcohols?
A.
Aldehyde
B.
Hydroxyl
C.
Carboxyl
D.
Amine
Show solution
Solution
Alcohols contain a hydroxyl (-OH) functional group.
Correct Answer:
B
— Hydroxyl
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Q. Which gas has the highest density at the same temperature and pressure?
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Solution
CO2 has the highest density among the given gases at the same temperature and pressure.
Correct Answer:
D
— CO2
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Q. Which gas has the highest rate of diffusion at a given temperature?
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Solution
Helium (He) has the highest rate of diffusion due to its low molar mass.
Correct Answer:
C
— He
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Q. Which gas is primarily responsible for the depletion of the ozone layer?
A.
Carbon Dioxide
B.
Chlorofluorocarbons
C.
Methane
D.
Nitrous Oxide
Show solution
Solution
Chlorofluorocarbons (CFCs) are primarily responsible for the depletion of the ozone layer.
Correct Answer:
B
— Chlorofluorocarbons
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Q. Which gas is primarily responsible for the greenhouse effect?
A.
Oxygen
B.
Nitrogen
C.
Carbon Dioxide
D.
Hydrogen
Show solution
Solution
Carbon Dioxide (CO2) is primarily responsible for the greenhouse effect, trapping heat in the atmosphere.
Correct Answer:
C
— Carbon Dioxide
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Q. Which gas is produced during the reaction of an acid with a carbonate?
A.
Oxygen
B.
Hydrogen
C.
Carbon dioxide
D.
Nitrogen
Show solution
Solution
The reaction of an acid with a carbonate produces carbon dioxide gas.
Correct Answer:
C
— Carbon dioxide
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