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 gas is produced when an acid reacts with a carbonate?
A.
Oxygen
B.
Carbon dioxide
C.
Hydrogen
D.
Nitrogen
Show solution
Solution
The reaction of an acid with a carbonate produces carbon dioxide gas.
Correct Answer:
B
— Carbon dioxide
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Q. Which gas law combines Boyle's and Charles's laws?
A.
Avogadro's Law
B.
Ideal Gas Law
C.
Dalton's Law
D.
Graham's Law
Show solution
Solution
The ideal gas law combines Boyle's and Charles's laws, relating pressure, volume, and temperature of an ideal gas.
Correct Answer:
B
— Ideal Gas Law
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Q. Which gas law describes the relationship between pressure, volume, and temperature?
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Ideal Gas Law
Show solution
Solution
The Ideal Gas Law describes the relationship between pressure, volume, and temperature of a gas.
Correct Answer:
D
— Ideal Gas Law
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Q. Which gas law relates pressure and temperature at constant volume?
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Gay-Lussac's Law
Show solution
Solution
Gay-Lussac's Law relates pressure and temperature at constant volume.
Correct Answer:
D
— Gay-Lussac's Law
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Q. Which gas law relates pressure, volume, and temperature of an ideal gas?
A.
Boyle's Law
B.
Charles's Law
C.
Ideal Gas Law
D.
Avogadro's Law
Show solution
Solution
The Ideal Gas Law (PV = nRT) relates pressure, volume, and temperature of an ideal gas.
Correct Answer:
C
— Ideal Gas Law
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Q. Which gas law relates the pressure, volume, and temperature of a gas?
A.
Boyle's Law
B.
Charles's Law
C.
Ideal Gas Law
D.
Avogadro's Law
Show solution
Solution
The Ideal Gas Law (PV = nRT) relates pressure, volume, and temperature of an ideal gas.
Correct Answer:
C
— Ideal Gas Law
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Q. Which gas law relates the pressure, volume, and temperature of an ideal gas?
A.
Boyle's Law
B.
Charles's Law
C.
Ideal Gas Law
D.
Avogadro's Law
Show solution
Solution
The Ideal Gas Law (PV = nRT) relates pressure, volume, and temperature of an ideal gas.
Correct Answer:
C
— Ideal Gas Law
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Q. Which gas law relates the volume and temperature of a gas at constant pressure?
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Graham's Law
Show solution
Solution
Charles's Law states that the volume of a gas is directly proportional to its temperature at constant pressure.
Correct Answer:
B
— Charles's Law
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Q. Which gas law relates volume and temperature at constant pressure?
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Ideal Gas Law
Show solution
Solution
Charles's Law states that the volume of a gas is directly proportional to its temperature at constant pressure.
Correct Answer:
B
— Charles's Law
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Q. Which gas law states that the volume of a gas is directly proportional to its temperature at constant pressure?
A.
Boyle's Law
B.
Charles's Law
C.
Gay-Lussac's Law
D.
Avogadro's Law
Show solution
Solution
Charles's Law states that the volume of a gas is directly proportional to its temperature at constant pressure.
Correct Answer:
B
— Charles's Law
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Q. Which gas law states that the volume of a gas is directly proportional to the number of moles at constant temperature and pressure?
A.
Boyle's Law
B.
Charles's Law
C.
Avogadro's Law
D.
Graham's Law
Show solution
Solution
Avogadro's Law states that the volume of a gas is directly proportional to the number of moles at constant temperature and pressure.
Correct Answer:
C
— Avogadro's Law
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Q. Which gate can be used to create a NOT operation using only NAND gates?
A.
Two NAND gates
B.
One NAND gate
C.
Three NAND gates
D.
Four NAND gates
Show solution
Solution
A NOT operation can be created using two NAND gates.
Correct Answer:
A
— Two NAND gates
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Q. Which gate can be used to invert the output of an AND gate?
A.
OR Gate
B.
NAND Gate
C.
XOR Gate
D.
NOT Gate
Show solution
Solution
A NAND gate inverts the output of an AND gate.
Correct Answer:
B
— NAND Gate
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Q. Which gate outputs true only when all inputs are false?
A.
AND
B.
OR
C.
NOR
D.
NAND
Show solution
Solution
The NOR gate outputs true only when all inputs are false.
Correct Answer:
C
— NOR
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Q. Which group of the periodic table contains the alkali metals?
A.
Group 1
B.
Group 2
C.
Group 13
D.
Group 18
Show solution
Solution
Alkali metals are found in Group 1 of the periodic table.
Correct Answer:
A
— Group 1
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Q. Which group of the periodic table contains the halogens?
A.
Group 1
B.
Group 2
C.
Group 17
D.
Group 18
Show solution
Solution
Halogens are located in Group 17 of the periodic table.
Correct Answer:
C
— Group 17
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Q. Which group of the periodic table contains the noble gases?
A.
Group 1
B.
Group 2
C.
Group 17
D.
Group 18
Show solution
Solution
Noble gases are found in Group 18 of the periodic table.
Correct Answer:
D
— Group 18
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Q. Which haloalkane is expected to have the highest boiling point?
A.
CH3Cl
B.
C2H5Cl
C.
C3H7Cl
D.
C4H9Cl
Show solution
Solution
C4H9Cl (butyl chloride) has the highest molecular weight and thus the highest boiling point due to increased van der Waals forces.
Correct Answer:
D
— C4H9Cl
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Q. Which haloalkane is least soluble in water?
A.
Chloroethane
B.
Bromoethane
C.
Iodoethane
D.
Fluoroethane
Show solution
Solution
Iodoethane is least soluble in water due to its larger non-polar iodine atom, which decreases the overall polarity of the molecule.
Correct Answer:
C
— Iodoethane
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Q. Which haloalkane would you expect to have the highest boiling point?
A.
Chloroethane
B.
Bromoethane
C.
Iodoethane
D.
Fluoroethane
Show solution
Solution
Iodoethane has the highest boiling point due to the larger size and greater polarizability of iodine, leading to stronger van der Waals forces.
Correct Answer:
C
— Iodoethane
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Q. Which hybridization corresponds to a tetrahedral molecular geometry?
A.
sp
B.
sp2
C.
sp3
D.
dsp2
Show solution
Solution
sp3 hybridization corresponds to a tetrahedral molecular geometry, as seen in CH4.
Correct Answer:
C
— sp3
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Q. Which is the correct order of adsorption strength from highest to lowest?
A.
Physisorption > Chemisorption
B.
Chemisorption > Physisorption
C.
Physisorption = Chemisorption
D.
None of the above
Show solution
Solution
Chemisorption is stronger than physisorption due to the formation of chemical bonds.
Correct Answer:
B
— Chemisorption > Physisorption
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Q. Which isotope is commonly used in nuclear reactors?
A.
Uranium-238
B.
Carbon-14
C.
Hydrogen-1
D.
Oxygen-16
Show solution
Solution
Uranium-238 is commonly used as fuel in nuclear reactors.
Correct Answer:
A
— Uranium-238
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Q. Which isotope of hydrogen is known as deuterium?
A.
H-1
B.
H-2
C.
H-3
D.
H-4
Show solution
Solution
Deuterium is the isotope of hydrogen with one neutron, denoted as H-2.
Correct Answer:
B
— H-2
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Q. Which isotope of hydrogen is the most abundant?
A.
Deuterium
B.
Tritium
C.
Protium
D.
Hydrogen-3
Show solution
Solution
Protium is the most abundant isotope of hydrogen.
Correct Answer:
C
— Protium
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Q. Which law states that energy cannot be created or destroyed?
A.
Zeroth law
B.
First law
C.
Second law
D.
Third law
Show solution
Solution
The first law of thermodynamics states that energy cannot be created or destroyed, only transformed.
Correct Answer:
B
— First law
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Q. Which law states that the entropy of a perfect crystal approaches zero as the temperature approaches absolute zero?
A.
Zeroth law of thermodynamics
B.
First law of thermodynamics
C.
Second law of thermodynamics
D.
Third law of thermodynamics
Show solution
Solution
The Third law of thermodynamics states that the entropy of a perfect crystal approaches zero as the temperature approaches absolute zero.
Correct Answer:
D
— Third law of thermodynamics
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Q. Which law states that the induced electromotive force (emf) in a closed circuit is proportional to the rate of change of magnetic flux through the circuit?
A.
Faraday's law
B.
Ampere's law
C.
Ohm's law
D.
Lenz's law
Show solution
Solution
Faraday's law states that the induced emf in a closed circuit is proportional to the rate of change of magnetic flux.
Correct Answer:
A
— Faraday's law
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Q. Which law states that the rate of heat transfer through a material is proportional to the temperature difference across it?
A.
Newton's Law of Cooling
B.
Fourier's Law
C.
Stefan-Boltzmann Law
D.
Ohm's Law
Show solution
Solution
Fourier's Law states that the rate of heat transfer through a material is proportional to the temperature difference across it.
Correct Answer:
B
— Fourier's Law
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Q. Which law states that the rate of heat transfer through a material is proportional to the negative gradient of temperature?
A.
Newton's Law of Cooling
B.
Fourier's Law of Heat Conduction
C.
Stefan-Boltzmann Law
D.
Kirchhoff's Law
Show solution
Solution
Fourier's Law of Heat Conduction states that the rate of heat transfer through a material is proportional to the negative gradient of temperature.
Correct Answer:
B
— Fourier's Law of Heat Conduction
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