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 amines is the most basic?
A.
Methylamine
B.
Ethylamine
C.
Aniline
D.
Dimethylamine
Show solution
Solution
Dimethylamine is the most basic due to the electron-donating effect of the two methyl groups, which increases the electron density on the nitrogen.
Correct Answer:
D
— Dimethylamine
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Q. Which of the following amino acids contains a sulfur atom?
A.
Cysteine
B.
Serine
C.
Glutamine
D.
Alanine
Show solution
Solution
Cysteine is the amino acid that contains a sulfur atom in its side chain, which can form disulfide bonds.
Correct Answer:
A
— Cysteine
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Q. Which of the following amino acids is essential in the human diet?
A.
Glycine
B.
Alanine
C.
Lysine
D.
Serine
Show solution
Solution
Lysine is an essential amino acid that must be obtained through the diet, while glycine, alanine, and serine can be synthesized by the body.
Correct Answer:
C
— Lysine
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Q. Which of the following assumptions is NOT part of the kinetic theory of gases?
A.
Gas molecules are in constant random motion
B.
Gas molecules have negligible volume compared to the container
C.
Gas molecules experience intermolecular forces
D.
Collisions between gas molecules are perfectly elastic
Show solution
Solution
The kinetic theory of gases assumes that gas molecules do not experience intermolecular forces, which is why option 3 is NOT part of the assumptions.
Correct Answer:
C
— Gas molecules experience intermolecular forces
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Q. Which of the following best describes plasma?
A.
A solid with high density
B.
A gas with low density
C.
An ionized gas
D.
A liquid at high temperature
Show solution
Solution
Plasma is an ionized gas consisting of free electrons and ions, typically found at high temperatures.
Correct Answer:
C
— An ionized gas
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Q. Which of the following best describes the arrangement of particles in a gas?
A.
Tightly packed in a fixed position
B.
Close together but can move past each other
C.
Far apart and moving freely
D.
Randomly arranged in a fixed structure
Show solution
Solution
Gas particles are far apart and move freely, allowing them to fill the container.
Correct Answer:
C
— Far apart and moving freely
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Q. Which of the following best describes the arrangement of particles in a solid?
A.
Random and far apart
B.
Close together and fixed in place
C.
Close together but free to move
D.
Random and close together
Show solution
Solution
In solids, particles are closely packed and fixed in place, giving them a definite shape.
Correct Answer:
B
— Close together and fixed in place
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Q. Which of the following best describes the effect of a larger slit width on the diffraction pattern?
A.
More pronounced diffraction
B.
Less pronounced diffraction
C.
No diffraction
D.
Increased number of fringes
Show solution
Solution
A larger slit width results in less pronounced diffraction, leading to a narrower central maximum.
Correct Answer:
B
— Less pronounced diffraction
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Q. Which of the following best describes the term 'angular width' of a diffraction maximum?
A.
The distance between two adjacent maxima
B.
The angle subtended by the maximum at the source
C.
The width of the maximum on a screen
D.
The angle between the first minimum and the central maximum
Show solution
Solution
The angular width of a diffraction maximum is defined as the angle between the first minimum on either side of the central maximum.
Correct Answer:
D
— The angle between the first minimum and the central maximum
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Q. Which of the following best describes the term 'elastic limit'?
A.
Maximum stress a material can withstand
B.
Point of permanent deformation
C.
Point of maximum strain
D.
Point of fracture
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Solution
The elastic limit is the maximum stress that a material can withstand without undergoing permanent deformation.
Correct Answer:
A
— Maximum stress a material can withstand
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Q. Which of the following best describes the term 'shear modulus'?
A.
Ratio of shear stress to shear strain
B.
Ratio of tensile stress to tensile strain
C.
Ratio of compressive stress to compressive strain
D.
Ratio of bulk stress to bulk strain
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Solution
The shear modulus is defined as the ratio of shear stress to shear strain in a material.
Correct Answer:
A
— Ratio of shear stress to shear strain
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Q. Which of the following biomolecules is primarily responsible for storing genetic information?
A.
Proteins
B.
Lipids
C.
Carbohydrates
D.
Nucleic acids
Show solution
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer:
D
— Nucleic acids
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Q. Which of the following bonds is the strongest?
A.
Single bond
B.
Double bond
C.
Triple bond
D.
All are equal
Show solution
Solution
Triple bonds are the strongest type of covalent bond due to the presence of three shared electron pairs.
Correct Answer:
C
— Triple bond
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Q. Which of the following carbohydrates is a disaccharide?
A.
Maltose
B.
Ribose
C.
Cellulose
D.
Glycogen
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Solution
Maltose is a disaccharide formed from two glucose units.
Correct Answer:
A
— Maltose
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Q. Which of the following carbohydrates is a ketose?
A.
Glucose
B.
Fructose
C.
Galactose
D.
Mannose
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Solution
Fructose is a ketose sugar, while glucose and galactose are aldoses.
Correct Answer:
B
— Fructose
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Q. Which of the following carbohydrates is a reducing sugar?
A.
Fructose
B.
Sucrose
C.
Maltose
D.
Cellulose
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Solution
Maltose is a reducing sugar because it has a free aldehyde or ketone group, while sucrose does not.
Correct Answer:
C
— Maltose
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Q. Which of the following carbohydrates is not digestible by humans?
A.
Starch
B.
Glycogen
C.
Cellulose
D.
Maltose
Show solution
Solution
Cellulose is not digestible by humans due to the lack of enzymes to break it down.
Correct Answer:
C
— Cellulose
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Q. Which of the following carboxylic acids is a dicarboxylic acid?
A.
Acetic acid
B.
Oxalic acid
C.
Formic acid
D.
Butanoic acid
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Solution
Oxalic acid is a dicarboxylic acid as it contains two carboxyl groups (-COOH).
Correct Answer:
B
— Oxalic acid
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Q. Which of the following carboxylic acids is a solid at room temperature?
A.
Acetic acid
B.
Formic acid
C.
Stearic acid
D.
Propanoic acid
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Solution
Stearic acid is a long-chain fatty acid and is solid at room temperature.
Correct Answer:
C
— Stearic acid
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Q. Which of the following changes will increase the yield of products in an exothermic reaction at equilibrium?
A.
Increase the temperature
B.
Decrease the pressure
C.
Increase the concentration of reactants
D.
Add a catalyst
Show solution
Solution
Increasing the concentration of reactants will shift the equilibrium position to the right, favoring the formation of products.
Correct Answer:
C
— Increase the concentration of reactants
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Q. Which of the following changes will NOT affect the position of equilibrium for the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g)?
A.
Increasing the concentration of SO2
B.
Decreasing the temperature
C.
Adding a catalyst
D.
Increasing the volume of the container
Show solution
Solution
A catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not affect the position of equilibrium.
Correct Answer:
C
— Adding a catalyst
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Q. Which of the following changes will NOT affect the position of equilibrium in a closed system?
A.
Adding a catalyst
B.
Changing the concentration of reactants
C.
Changing the pressure
D.
Changing the temperature
Show solution
Solution
A catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not change the position of equilibrium.
Correct Answer:
A
— Adding a catalyst
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Q. Which of the following changes will NOT affect the position of equilibrium?
A.
Adding a catalyst
B.
Changing the concentration of reactants
C.
Changing the temperature
D.
Changing the pressure
Show solution
Solution
A catalyst speeds up the rate of reaching equilibrium but does not change the position of equilibrium or the equilibrium constant.
Correct Answer:
A
— Adding a catalyst
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Q. Which of the following changes will shift the equilibrium to the right for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)?
A.
Increase in pressure
B.
Decrease in temperature
C.
Increase in volume
D.
Addition of NH3
Show solution
Solution
Increasing pressure shifts the equilibrium to the side with fewer moles of gas, which is the right side in this case.
Correct Answer:
A
— Increase in pressure
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Q. Which of the following colligative properties is affected by the number of solute particles in a solution?
A.
Vapor pressure lowering
B.
Density
C.
Color
D.
Viscosity
Show solution
Solution
Vapor pressure lowering is a colligative property that depends on the number of solute particles in a solution.
Correct Answer:
A
— Vapor pressure lowering
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Q. Which of the following colligative properties is used to determine molar mass?
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 of the following colligative properties is used to determine the molar mass of a solute?
A.
Vapor pressure lowering
B.
Boiling point elevation
C.
Freezing point depression
D.
Osmotic pressure
Show solution
Solution
Freezing point depression can be used to determine the molar mass of a solute by measuring the decrease in freezing point.
Correct Answer:
C
— Freezing point depression
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Q. Which of the following colors of light has the shortest wavelength?
A.
Red
B.
Green
C.
Blue
D.
Violet
Show solution
Solution
Violet light has the shortest wavelength among the visible spectrum.
Correct Answer:
D
— Violet
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Q. Which of the following complexes exhibits geometrical isomerism?
A.
[Co(NH3)3Cl3]
B.
[Ni(CN)4]2-
C.
[CuCl4]2-
D.
[Fe(CO)6]
Show solution
Solution
[Co(NH3)3Cl3] can exhibit geometrical isomerism due to the presence of different ligands in a square planar geometry.
Correct Answer:
A
— [Co(NH3)3Cl3]
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Q. Which of the following complexes exhibits optical isomerism?
A.
[Cr(en)3]3+
B.
[Co(NH3)6]3+
C.
[NiCl2(H2O)4]
D.
[CuCl2]
Show solution
Solution
The complex [Cr(en)3]3+ exhibits optical isomerism due to its chiral nature.
Correct Answer:
A
— [Cr(en)3]3+
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