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. What is the main product when hydrogen reacts with nitrogen at high temperatures?
A.
Ammonia
B.
Hydrazine
C.
Nitric oxide
D.
Nitrogen gas
Show solution
Solution
The main product of the reaction between hydrogen and nitrogen at high temperatures is ammonia (NH3).
Correct Answer:
A
— Ammonia
Learn More →
Q. What is the main product when phenol is treated with bromine water?
A.
Bromobenzene
B.
2,4,6-Tribromophenol
C.
Bromophenol
D.
Benzene
Show solution
Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer:
B
— 2,4,6-Tribromophenol
Learn More →
Q. What is the main product when phenol is treated with zinc dust?
A.
Benzene
B.
Cyclohexanol
C.
Toluene
D.
Phenyl ether
Show solution
Solution
Zinc dust reduces phenol to benzene.
Correct Answer:
A
— Benzene
Learn More →
Q. What is the main product when phenol reacts with bromine water?
A.
Bromobenzene
B.
2,4,6-tribromophenol
C.
Bromophenol
D.
Benzene
Show solution
Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer:
B
— 2,4,6-tribromophenol
Learn More →
Q. What is the main product when phenol reacts with concentrated sulfuric acid?
A.
Phenyl sulfate
B.
Benzene
C.
Catechol
D.
Anisole
Show solution
Solution
The main product is phenyl sulfate, formed by the electrophilic substitution of the hydroxyl group.
Correct Answer:
A
— Phenyl sulfate
Learn More →
Q. What is the main product when propan-2-one is treated with sodium bisulfite?
A.
Sodium propan-2-one sulfonate
B.
Propan-2-ol
C.
Propan-2-one bisulfite adduct
D.
None of the above
Show solution
Solution
The main product is the propan-2-one bisulfite adduct.
Correct Answer:
C
— Propan-2-one bisulfite adduct
Learn More →
Q. What is the main product when propanal is treated with excess alcohol in the presence of an acid catalyst?
A.
Aldol
B.
Acetal
C.
Ketone
D.
Carboxylic acid
Show solution
Solution
When propanal is treated with excess alcohol in the presence of an acid catalyst, an acetal is formed.
Correct Answer:
B
— Acetal
Learn More →
Q. What is the main product when propanal is treated with excess Grignard reagent followed by hydrolysis?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propan-1,2-diol
D.
Butan-2-ol
Show solution
Solution
The reaction of propanal with excess Grignard reagent followed by hydrolysis yields propan-2-ol.
Correct Answer:
B
— Propan-2-ol
Learn More →
Q. What is the main product when propanal is treated with excess hydrogen in the presence of a catalyst?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propanoic acid
D.
Propane
Show solution
Solution
Propanal is reduced to propan-1-ol when treated with excess hydrogen in the presence of a catalyst.
Correct Answer:
A
— Propan-1-ol
Learn More →
Q. What is the main product when propanoic acid is treated with thionyl chloride?
A.
Propyl chloride
B.
Propanoic anhydride
C.
Propionyl chloride
D.
Propylene
Show solution
Solution
The reaction of propanoic acid with thionyl chloride produces propionyl chloride.
Correct Answer:
C
— Propionyl chloride
Learn More →
Q. What is the main product when propene is reacted with hydrogen in the presence of a catalyst?
A.
Propane
B.
Butane
C.
Ethane
D.
Cyclopropane
Show solution
Solution
The main product of the hydrogenation of propene is propane.
Correct Answer:
A
— Propane
Learn More →
Q. What is the main product when propene undergoes hydroboration-oxidation?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Propanoic acid
D.
Butanol
Show solution
Solution
The main product of hydroboration-oxidation of propene is propan-2-ol.
Correct Answer:
B
— Propan-2-ol
Learn More →
Q. What is the main product when toluene is nitrated?
A.
Nitrotoluene
B.
Dinitrotoluene
C.
Benzaldehyde
D.
Benzyl alcohol
Show solution
Solution
Nitration of toluene primarily yields nitrotoluene, with the nitro group being directed to the ortho and para positions.
Correct Answer:
A
— Nitrotoluene
Learn More →
Q. What is the main purpose of emulsifiers in food products?
A.
Thicken
B.
Stabilize mixtures
C.
Add flavor
D.
Preserve freshness
Show solution
Solution
Emulsifiers stabilize mixtures of oil and water, preventing separation in food products.
Correct Answer:
B
— Stabilize mixtures
Learn More →
Q. What is the main purpose of using antioxidants in food?
A.
Enhance color
B.
Prevent oxidation
C.
Improve taste
D.
Increase shelf life
Show solution
Solution
Antioxidants are used to prevent oxidation, which can lead to spoilage and loss of quality.
Correct Answer:
B
— Prevent oxidation
Learn More →
Q. What is the main purpose of using baking soda in cooking?
A.
Flavoring
B.
Leavening
C.
Preserving
D.
Coloring
Show solution
Solution
Baking soda acts as a leavening agent, helping baked goods to rise.
Correct Answer:
B
— Leavening
Learn More →
Q. What is the main purpose of using fluoride in dental care?
A.
Whiten teeth
B.
Prevent cavities
C.
Freshen breath
D.
Strengthen gums
Show solution
Solution
Fluoride is used in dental care to help prevent cavities and strengthen tooth enamel.
Correct Answer:
B
— Prevent cavities
Learn More →
Q. What is the main reaction type when alcohols are converted to alkyl halides?
A.
Substitution
B.
Elimination
C.
Addition
D.
Redox
Show solution
Solution
The conversion of alcohols to alkyl halides typically involves a nucleophilic substitution reaction.
Correct Answer:
A
— Substitution
Learn More →
Q. What is the main reason for the appearance of a diffraction pattern when light passes through a narrow slit?
A.
Interference of light waves
B.
Refraction of light
C.
Absorption of light
D.
Reflection of light
Show solution
Solution
The diffraction pattern arises due to the interference of light waves that spread out after passing through the slit.
Correct Answer:
A
— Interference of light waves
Learn More →
Q. What is the main reason for the existence of geometric isomers?
A.
Presence of double bonds
B.
Presence of single bonds
C.
Presence of chiral centers
D.
Presence of functional groups
Show solution
Solution
Geometric isomers arise due to restricted rotation around double bonds.
Correct Answer:
A
— Presence of double bonds
Learn More →
Q. What is the main reason for the stability of aromatic compounds?
A.
High molecular weight
B.
Presence of double bonds
C.
Resonance energy
D.
Hydrogen bonding
Show solution
Solution
The stability of aromatic compounds is primarily due to resonance energy, which arises from the delocalization of pi electrons across the ring.
Correct Answer:
C
— Resonance energy
Learn More →
Q. What is the main reason for the stability of atomic nuclei?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
Show solution
Solution
The stability of atomic nuclei is primarily due to the strong nuclear force, which binds protons and neutrons together.
Correct Answer:
C
— Strong nuclear force
Learn More →
Q. What is the main reason for the stability of benzene?
A.
Presence of double bonds
B.
Resonance
C.
Hydrogen bonding
D.
Ionic interactions
Show solution
Solution
The stability of benzene arises from resonance, where the electrons are delocalized over the ring structure, lowering the overall energy.
Correct Answer:
B
— Resonance
Learn More →
Q. What is the main reason for the stability of the electron orbits in an atom?
A.
Centripetal force
B.
Electrostatic force
C.
Quantum mechanics
D.
All of the above
Show solution
Solution
The stability of the electron orbits in an atom is primarily explained by quantum mechanics.
Correct Answer:
C
— Quantum mechanics
Learn More →
Q. What is the main reason for the stability of the nucleus in an atom?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
Show solution
Solution
The stability of the nucleus is primarily due to the strong nuclear force, which binds protons and neutrons together.
Correct Answer:
C
— Strong nuclear force
Learn More →
Q. What is the main reason for the stability of the nucleus?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
Show solution
Solution
The stability of the nucleus is primarily due to the strong nuclear force, which binds protons and neutrons together.
Correct Answer:
C
— Strong nuclear force
Learn More →
Q. What is the main reason that gases have low density compared to solids and liquids?
A.
High temperature
B.
Low pressure
C.
Large particle separation
D.
High kinetic energy
Show solution
Solution
Gases have low density because their particles are far apart, leading to a larger volume for the same mass.
Correct Answer:
C
— Large particle separation
Learn More →
Q. What is the main source of alkanes?
A.
Coal
B.
Natural gas
C.
Petroleum
D.
Biomass
Show solution
Solution
The main source of alkanes is petroleum, which contains a mixture of hydrocarbons.
Correct Answer:
C
— Petroleum
Learn More →
Q. What is the main source of nitrogen oxides in the atmosphere?
A.
Volcanic eruptions
B.
Vehicle emissions
C.
Industrial processes
D.
Agricultural activities
Show solution
Solution
Vehicle emissions are the main source of nitrogen oxides (NOx) in the atmosphere.
Correct Answer:
B
— Vehicle emissions
Learn More →
Q. What is the main source of sulfur dioxide in the atmosphere?
A.
Volcanic eruptions
B.
Automobile emissions
C.
Industrial processes
D.
All of the above
Show solution
Solution
Sulfur dioxide is released from various sources including volcanic eruptions, automobile emissions, and industrial processes.
Correct Answer:
D
— All of the above
Learn More →
Showing 7291 to 7320 of 10700 (357 Pages)