JEE Main Preparation Resources for Competitive Exams

My Learning Cart

JEE Main

Download Q&A

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.

Chemistry Syllabus (JEE Main) Mathematics Syllabus (JEE Main) Physics Syllabus (JEE Main)

Q. Which of the following quantum numbers describes the orientation of an orbital?

A. Principal quantum number
B. Azimuthal quantum number
C. Magnetic quantum number
D. Spin quantum number

Solution

The magnetic quantum number describes the orientation of an orbital in space.

Correct Answer: C — Magnetic quantum number

Q. Which of the following quantum numbers describes the shape of an orbital?

A. Principal quantum number
B. Azimuthal quantum number
C. Magnetic quantum number
D. Spin quantum number

Solution

The azimuthal quantum number (l) determines the shape of the orbital.

Correct Answer: B — Azimuthal quantum number

Q. Which of the following quantum numbers is associated with the orientation of an orbital?

A. n
B. l
C. m_l
D. m_s

Solution

The magnetic quantum number (m_l) describes the orientation of an orbital.

Correct Answer: C — m_l

Q. Which of the following quantum numbers is not associated with the electron spin?

A. n
B. l
C. m_l
D. s

Solution

The principal quantum number n is not associated with electron spin; it describes the energy level.

Correct Answer: A — n

Q. Which of the following quantum numbers is not associated with the electron's energy level?

A. n
B. l
C. m_l
D. m_s

Solution

The spin quantum number (m_s) does not affect the energy level of the electron.

Correct Answer: D — m_s

Q. Which of the following quantum numbers is not associated with the spin of an electron?

A. n
B. l
C. m_l
D. s

Solution

The principal quantum number n, azimuthal quantum number l, and magnetic quantum number m_l do not describe the spin of an electron. The spin quantum number s does.

Correct Answer: A — n

Q. Which of the following reactions can alkynes undergo?

A. Electrophilic addition
B. Nucleophilic substitution
C. Free radical substitution
D. All of the above

Solution

Alkynes can undergo electrophilic addition reactions due to the presence of the triple bond.

Correct Answer: A — Electrophilic addition

Q. Which of the following reactions can be used to convert an alkene into an alcohol?

A. Hydrogenation
B. Hydroboration-oxidation
C. Dehydrohalogenation
D. Electrophilic addition

Solution

Hydroboration-oxidation is a two-step process that converts alkenes into alcohols.

Correct Answer: B — Hydroboration-oxidation

Q. Which of the following reactions can be used to convert an alkyne to a cis-alkene?

A. Hydrogenation
B. Halogenation
C. Hydroboration
D. Ozonolysis

Solution

Hydroboration followed by oxidation converts alkynes to cis-alkenes.

Correct Answer: C — Hydroboration

Q. Which of the following reactions can be used to convert an alkyne to an alkene?

A. Hydrogenation
B. Halogenation
C. Hydrohalogenation
D. Dehydrohalogenation

Solution

Hydrogenation of an alkyne will add hydrogen across the triple bond, converting it to an alkene.

Correct Answer: A — Hydrogenation

Q. Which of the following reactions can be used to prepare alkynes?

A. Hydrogenation of alkenes
B. Dehydrohalogenation of alkyl halides
C. Oxidation of alkanes
D. Hydrolysis of alkynes

Solution

Alkynes can be prepared by the dehydrohalogenation of alkyl halides.

Correct Answer: B — Dehydrohalogenation of alkyl halides

Q. Which of the following reactions can be used to prepare carboxylic acids?

A. Hydrolysis of esters
B. Reduction of ketones
C. Oxidation of alcohols
D. All of the above

Solution

Carboxylic acids can be prepared by the hydrolysis of esters.

Correct Answer: A — Hydrolysis of esters

Q. Which of the following reactions has a negative enthalpy change?

A. Dissolving NaCl in water
B. Photosynthesis
C. Respiration
D. Melting of ice

Solution

Respiration is an exothermic reaction that releases energy, resulting in a negative enthalpy change.

Correct Answer: C — Respiration

Q. Which of the following reactions has a positive ΔG at standard conditions?

A. Combustion of glucose
B. Formation of water from hydrogen and oxygen
C. Dissolution of salt in water
D. Decomposition of hydrogen peroxide

Solution

The decomposition of hydrogen peroxide is non-spontaneous under standard conditions, resulting in a positive ΔG.

Correct Answer: D — Decomposition of hydrogen peroxide

Q. Which of the following reactions has a positive ΔH and a positive ΔS?

A. Combustion of fuels
B. Dissolution of salts
C. Sublimation of dry ice
D. Formation of water from hydrogen and oxygen

Solution

Sublimation of dry ice (solid CO2 to gas) has a positive ΔH (endothermic) and a positive ΔS (increase in disorder).

Correct Answer: C — Sublimation of dry ice

Q. Which of the following reactions has the highest enthalpy change?

A. Dissolving NaCl in water
B. Combustion of propane
C. Formation of NH3 from N2 and H2
D. Sublimation of dry ice

Solution

The combustion of propane releases a large amount of energy, resulting in the highest enthalpy change among the options.

Correct Answer: B — Combustion of propane

Q. Which of the following reactions is a redox reaction?

A. H2 + Cl2 → 2HCl
B. NaOH + HCl → NaCl + H2O
C. CaCO3 → CaO + CO2
D. C6H12O6 + 6O2 → 6CO2 + 6H2O

Solution

The combustion of glucose is a redox reaction where glucose is oxidized.

Correct Answer: D — C6H12O6 + 6O2 → 6CO2 + 6H2O

Q. Which of the following reactions is characteristic of alkanes?

A. Electrophilic substitution
B. Nucleophilic substitution
C. Free radical substitution
D. Addition reaction

Solution

Alkanes undergo free radical substitution reactions, especially in the presence of halogens.

Correct Answer: C — Free radical substitution

Q. Which of the following reactions is characteristic of alkenes?

A. Electrophilic addition
B. Nucleophilic substitution
C. Free radical substitution
D. Elimination

Solution

Alkenes undergo electrophilic addition reactions due to the presence of a double bond.

Correct Answer: A — Electrophilic addition

Q. Which of the following reactions is characteristic of aromatic compounds?

A. Addition reaction
B. Substitution reaction
C. Elimination reaction
D. Redox reaction

Solution

Aromatic compounds typically undergo electrophilic substitution reactions rather than addition reactions due to their stable aromaticity.

Correct Answer: B — Substitution reaction

Q. Which of the following reactions is expected to have a positive change in entropy?

A. N2(g) + 3H2(g) → 2NH3(g)
B. C(s) + O2(g) → CO2(g)
C. 2H2O(l) → 2H2(g) + O2(g)
D. CaCO3(s) → CaO(s) + CO2(g)

Solution

The decomposition of liquid water into gaseous hydrogen and oxygen increases the number of gas molecules, leading to a positive change in entropy.

Correct Answer: C — 2H2O(l) → 2H2(g) + O2(g)

Q. Which of the following reactions is likely to have a negative ΔG?

A. Combustion of hydrocarbons.
B. Formation of ice from water at 0°C.
C. Dissolution of salt in water.
D. Decomposition of hydrogen peroxide.

Solution

The combustion of hydrocarbons is highly exothermic and typically has a negative ΔG, indicating spontaneity.

Correct Answer: A — Combustion of hydrocarbons.

Q. Which of the following reactions is not typical for alkenes?

A. Addition of H2
B. Addition of HCl
C. Elimination of H2O
D. Substitution reaction

Solution

Alkenes typically undergo addition reactions rather than substitution reactions.

Correct Answer: D — Substitution reaction

Q. Which of the following reactions is spontaneous at all temperatures?

A. ΔH < 0 and ΔS < 0
B. ΔH > 0 and ΔS > 0
C. ΔH < 0 and ΔS > 0
D. ΔH > 0 and ΔS < 0

Solution

A reaction with ΔH < 0 and ΔS > 0 is spontaneous at all temperatures because it results in a negative ΔG.

Correct Answer: C — ΔH < 0 and ΔS > 0

Q. Which of the following reactions will have a negative ΔG at high temperatures?

A. Exothermic reactions with negative ΔS
B. Endothermic reactions with positive ΔS
C. Exothermic reactions with positive ΔS
D. Endothermic reactions with negative ΔS

Solution

Endothermic reactions with positive ΔS can have a negative ΔG at high temperatures due to the TΔS term becoming significant.

Correct Answer: B — Endothermic reactions with positive ΔS

Q. Which of the following relations is an equivalence relation on the set of integers?

A. x ~ y if x + y is even
B. x ~ y if x - y is prime
C. x ~ y if x > y
D. x ~ y if x = y

Solution

The relation x ~ y if x + y is even is reflexive, symmetric, and transitive, thus it is an equivalence relation.

Correct Answer: A — x ~ y if x + y is even

Q. Which of the following relations is not a function?

A. R = {(1, 2), (2, 3), (3, 4)}
B. R = {(1, 2), (1, 3)}
C. R = {(2, 3), (3, 4)}
D. R = {(4, 5), (5, 6)}

Solution

R = {(1, 2), (1, 3)} is not a function because the input 1 maps to two different outputs.

Correct Answer: B — R = {(1, 2), (1, 3)}

Q. Which of the following relations on the set of integers is not a function?

A. R1 = {(1, 2), (1, 3)}
B. R2 = {(2, 3), (3, 4)}
C. R3 = {(4, 5)}
D. R4 = {(5, 6), (6, 7)}

Solution

R1 is not a function because the input 1 maps to two different outputs (2 and 3).

Correct Answer: A — R1 = {(1, 2), (1, 3)}

Q. Which of the following represents a family of circles with varying radii?

A. (x - h)^2 + (y - k)^2 = r^2
B. (x - h)^2 + (y - k) = r
C. x^2 + y^2 = r
D. x^2 + y^2 = kx

Solution

The equation (x - h)^2 + (y - k)^2 = r^2 represents a circle centered at (h, k) with radius r.

Correct Answer: A — (x - h)^2 + (y - k)^2 = r^2

Q. Which of the following represents a family of curves for the equation y = a sin(bx)?

A. Linear functions
B. Exponential functions
C. Sine waves with varying amplitudes and frequencies
D. Quadratic functions

Solution

The equation y = a sin(bx) represents sine waves where 'a' is the amplitude and 'b' is the frequency.

Correct Answer: C — Sine waves with varying amplitudes and frequencies

Showing 10231 to 10260 of 10700 (357 Pages)

School

College

Degree

Competitve

Skills

Soulshift Feedback ×

On a scale of 0–10, how likely are you to recommend The Soulshift Academy?

Not likely Very likely