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 hydrocarbons is a cyclic compound?
A.
Butene
B.
Cyclobutane
C.
Hexane
D.
Octene
Show solution
Solution
Cyclobutane is a cyclic compound, while the others are linear alkenes or alkanes.
Correct Answer:
B
— Cyclobutane
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Q. Which of the following hydrocarbons is a gas at room temperature?
A.
Octane
B.
Hexane
C.
Methane
D.
Decane
Show solution
Solution
Methane (CH4) is a gas at room temperature, while the others are liquids.
Correct Answer:
C
— Methane
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Q. Which of the following hydrogen compounds is used as a reducing agent?
A.
H2O
B.
H2
C.
HCl
D.
NH3
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Solution
Hydrogen gas (H2) is commonly used as a reducing agent in various chemical reactions.
Correct Answer:
B
— H2
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Q. Which of the following ions has the smallest ionic radius?
A.
Na+
B.
Mg2+
C.
Al3+
D.
Si4+
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Solution
Si4+ has the smallest ionic radius due to its high positive charge, which pulls the electrons closer.
Correct Answer:
D
— Si4+
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Q. Which of the following ions is colored in solution?
A.
Na+
B.
Ca2+
C.
Cu2+
D.
Mg2+
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Solution
Cu2+ ions are colored in solution due to d-d transitions.
Correct Answer:
C
— Cu2+
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Q. Which of the following ions is responsible for the green color of a solution?
A.
Cu2+
B.
Fe2+
C.
Ni2+
D.
Co2+
Show solution
Solution
Co2+ ions typically impart a green color to solutions due to d-d transitions.
Correct Answer:
D
— Co2+
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Q. Which of the following ions will cause the precipitation of AgCl from a solution of AgNO3?
A.
Na+
B.
Cl-
C.
NO3-
D.
K+
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Solution
Cl- ions will react with Ag+ ions from AgNO3 to form AgCl, which is insoluble in water and will precipitate out.
Correct Answer:
B
— Cl-
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Q. Which of the following ions will cause the precipitation of BaSO4 from a solution of barium chloride?
A.
Na+
B.
Cl-
C.
SO4^2-
D.
K+
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Solution
The presence of SO4^2- ions will react with Ba2+ ions to form insoluble BaSO4, causing precipitation.
Correct Answer:
C
— SO4^2-
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Q. Which of the following ions will cause the precipitation of silver chloride (AgCl) from a solution?
A.
Na+
B.
Cl-
C.
Ag+
D.
K+
Show solution
Solution
Cl- ions will react with Ag+ ions to form the insoluble salt AgCl, causing precipitation.
Correct Answer:
B
— Cl-
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Q. Which of the following ions will increase the acidity of a solution?
A.
Na+
B.
Cl-
C.
NH4+
D.
K+
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Solution
NH4+ is the conjugate acid of a weak base (NH3) and will increase the acidity of the solution.
Correct Answer:
C
— NH4+
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Q. Which of the following is a bidentate ligand?
A.
NH3
B.
EDTA
C.
Cl-
D.
H2O
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Solution
EDTA is a bidentate ligand because it can form two bonds with a metal ion due to its two donor atoms.
Correct Answer:
B
— EDTA
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Q. Which of the following is a biodegradable polymer?
A.
Polyethylene
B.
Polylactic acid (PLA)
C.
Polypropylene
D.
Polystyrene
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Solution
Polylactic acid (PLA) is a biodegradable polymer derived from renewable resources.
Correct Answer:
B
— Polylactic acid (PLA)
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Q. Which of the following is a branched alkane?
A.
Pentane
B.
Isopentane
C.
Hexane
D.
Heptane
Show solution
Solution
Isopentane is a branched alkane, while the others are straight-chain alkanes.
Correct Answer:
B
— Isopentane
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Q. Which of the following is a branched-chain alkane?
A.
Pentane
B.
2-Methylbutane
C.
Hexane
D.
Heptane
Show solution
Solution
2-Methylbutane is a branched-chain alkane derived from butane.
Correct Answer:
B
— 2-Methylbutane
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Q. Which of the following is a carbohydrate?
A.
Glucose
B.
Amino acid
C.
Fatty acid
D.
Nucleotide
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Solution
Glucose is a simple sugar and a primary carbohydrate.
Correct Answer:
A
— Glucose
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Q. Which of the following is a characteristic feature of alkanes?
A.
They contain at least one double bond
B.
They are saturated hydrocarbons
C.
They have a cyclic structure
D.
They contain functional groups
Show solution
Solution
Alkanes are saturated hydrocarbons, meaning they contain only single bonds between carbon atoms.
Correct Answer:
B
— They are saturated hydrocarbons
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Q. Which of the following is a characteristic feature of cycloalkanes?
A.
They are always aromatic
B.
They contain a ring structure
C.
They have double bonds
D.
They are always gaseous at room temperature
Show solution
Solution
Cycloalkanes are characterized by their ring structure.
Correct Answer:
B
— They contain a ring structure
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Q. Which of the following is a characteristic of +M effect?
A.
Electron withdrawal
B.
Electron donation
C.
No effect
D.
Increased acidity
Show solution
Solution
+M effect is characterized by electron donation through resonance, enhancing stability.
Correct Answer:
B
— Electron donation
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Q. Which of the following is a characteristic of a base?
A.
Sour taste
B.
Bitter taste
C.
Turns litmus red
D.
Reacts with metals to produce hydrogen
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Solution
Bases typically have a bitter taste and turn litmus paper blue.
Correct Answer:
B
— Bitter taste
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Q. Which of the following is a characteristic of a black body?
A.
Reflects all radiation
B.
Absorbs all radiation
C.
Transmits all radiation
D.
Scatters all radiation
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Solution
A black body is defined as an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.
Correct Answer:
B
— Absorbs all radiation
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Q. Which of the following is a characteristic of a buffer solution?
A.
It changes pH drastically with small amounts of acid or base
B.
It resists changes in pH
C.
It has a pH of 7
D.
It can only be made from strong acids and bases
Show solution
Solution
A buffer solution is designed to resist changes in pH when small amounts of acid or base are added.
Correct Answer:
B
— It resists changes in pH
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Q. Which of the following is a characteristic of a catalyst?
A.
It is consumed in the reaction
B.
It increases the activation energy
C.
It lowers the activation energy
D.
It changes the equilibrium constant
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Solution
A catalyst lowers the activation energy of a reaction, thereby increasing the rate.
Correct Answer:
C
— It lowers the activation energy
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Q. Which of the following is a characteristic of a crystalline solid compared to a liquid?
A.
Definite melting point
B.
Fluidity
C.
High compressibility
D.
Random arrangement of particles
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Solution
Crystalline solids have a definite melting point due to their ordered structure.
Correct Answer:
A
— Definite melting point
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Q. Which of the following is a characteristic of a first-order reaction?
A.
Rate is proportional to the square of the concentration
B.
Rate is independent of concentration
C.
Rate is directly proportional to concentration
D.
Rate is inversely proportional to concentration
Show solution
Solution
In a first-order reaction, the rate is directly proportional to the concentration of the reactant.
Correct Answer:
C
— Rate is directly proportional to concentration
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Q. Which of the following is a characteristic of a fuel cell?
A.
Produces heat
B.
Converts chemical energy directly to electrical energy
C.
Requires combustion
D.
Is a type of battery
Show solution
Solution
A fuel cell converts chemical energy directly to electrical energy without combustion.
Correct Answer:
B
— Converts chemical energy directly to electrical energy
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Q. Which of the following is a characteristic of a liquid in a closed container?
A.
It can expand indefinitely
B.
It has a fixed volume
C.
It has a fixed shape
D.
It cannot exert pressure
Show solution
Solution
A liquid in a closed container has a fixed volume but can exert pressure.
Correct Answer:
B
— It has a fixed volume
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Q. Which of the following is a characteristic of a liquid in equilibrium?
A.
Constant density
B.
Constant temperature
C.
Constant pressure
D.
All of the above
Show solution
Solution
In equilibrium, a liquid maintains constant density, temperature, and pressure.
Correct Answer:
D
— All of the above
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Q. Which of the following is a characteristic of a Newtonian fluid?
A.
Viscosity changes with shear rate
B.
Viscosity remains constant
C.
Non-linear stress-strain relationship
D.
High compressibility
Show solution
Solution
A Newtonian fluid has a constant viscosity regardless of the shear rate applied.
Correct Answer:
B
— Viscosity remains constant
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Q. Which of the following is a characteristic of a non-Newtonian fluid?
A.
Constant viscosity
B.
Viscosity changes with shear rate
C.
Incompressible
D.
Always flows in a straight line
Show solution
Solution
Non-Newtonian fluids exhibit a change in viscosity with varying shear rates, unlike Newtonian fluids which have a constant viscosity.
Correct Answer:
B
— Viscosity changes with shear rate
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Q. Which of the following is a characteristic of a polar orbiting satellite?
A.
It orbits above the equator
B.
It has a fixed position relative to the Earth
C.
It passes over the poles
D.
It is used for communication
Show solution
Solution
A polar orbiting satellite passes over the poles, allowing it to cover the entire surface of the Earth over time.
Correct Answer:
C
— It passes over the poles
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