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 storage form of carbohydrates in animals?
A.
Starch
B.
Glycogen
C.
Cellulose
D.
Chitin
Show solution
Solution
Glycogen is the main storage form of carbohydrates in animals, while starch is the storage form in plants.
Correct Answer:
B
— Glycogen
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Q. What is the main structural component of plant cell walls?
A.
Starch
B.
Glycogen
C.
Cellulose
D.
Chitin
Show solution
Solution
Cellulose is the main structural component of plant cell walls.
Correct Answer:
C
— Cellulose
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Q. What is the main type of isomerism exhibited by butene (C4H8)?
A.
Structural isomerism
B.
Geometric isomerism
C.
Optical isomerism
D.
Functional isomerism
Show solution
Solution
Butene exhibits geometric isomerism due to the presence of a double bond, allowing for cis and trans configurations.
Correct Answer:
B
— Geometric isomerism
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Q. What is the main type of reaction that alkanes undergo?
A.
Addition
B.
Substitution
C.
Elimination
D.
Condensation
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Solution
Alkanes primarily undergo substitution reactions, especially in the presence of halogens.
Correct Answer:
B
— Substitution
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Q. What is the main use of hydrogen in the Haber process?
A.
To produce ammonia
B.
To produce water
C.
To produce hydrogen peroxide
D.
To produce methane
Show solution
Solution
In the Haber process, hydrogen is used to produce ammonia (NH3).
Correct Answer:
A
— To produce ammonia
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Q. What is the main use of polycarbonate?
A.
Insulation
B.
Optical lenses
C.
Textiles
D.
Adhesives
Show solution
Solution
Polycarbonate is primarily used in the production of optical lenses due to its clarity and strength.
Correct Answer:
B
— Optical lenses
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Q. What is the main use of polyvinyl chloride (PVC)?
A.
Insulation
B.
Pipes and fittings
C.
Textiles
D.
Adhesives
Show solution
Solution
Polyvinyl chloride (PVC) is primarily used in pipes and fittings due to its durability.
Correct Answer:
B
— Pipes and fittings
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Q. What is the major product of the hydration of propene?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Butanol
D.
Ethylene glycol
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Solution
The major product of the hydration of propene is propan-2-ol due to Markovnikov's rule.
Correct Answer:
B
— Propan-2-ol
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Q. What is the major product of the reaction between 1-bromo-2-methylpropane and sodium ethoxide?
A.
1-ethoxy-2-methylpropane
B.
2-ethoxy-2-methylpropane
C.
1-bromo-2-ethoxypropane
D.
2-bromo-2-methylpropane
Show solution
Solution
The reaction is an SN2 reaction leading to the formation of 1-ethoxy-2-methylpropane.
Correct Answer:
B
— 2-ethoxy-2-methylpropane
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Q. What is the major product of the reaction between 1-bromobutane and sodium ethoxide in ethanol?
A.
1-ethoxybutane
B.
2-ethoxybutane
C.
butane
D.
no reaction
Show solution
Solution
The reaction is an example of an SN2 reaction, where sodium ethoxide acts as a nucleophile, leading to the formation of 1-ethoxybutane.
Correct Answer:
B
— 2-ethoxybutane
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Q. What is the major product of the reaction between 1-bromobutane and sodium hydroxide in ethanol?
A.
1-butanol
B.
2-butanol
C.
butyl bromide
D.
butyl ether
Show solution
Solution
The reaction leads to the formation of 1-butanol through an SN2 mechanism.
Correct Answer:
B
— 2-butanol
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Q. What is the major product of the reaction between chlorobenzene and sodium hydroxide at high temperature?
A.
Phenol
B.
Benzene
C.
Chlorobenzene
D.
Sodium phenoxide
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Solution
The reaction of chlorobenzene with sodium hydroxide at high temperature leads to the formation of phenol through nucleophilic substitution.
Correct Answer:
A
— Phenol
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Q. What is the major product of the reaction of 1-bromobutane with sodium ethoxide in ethanol?
A.
1-butene
B.
2-butene
C.
butane
D.
no reaction
Show solution
Solution
The reaction proceeds via an elimination mechanism (E2) leading to the formation of 2-butene as the major product.
Correct Answer:
B
— 2-butene
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Q. What is the major product of the reaction of 1-bromobutane with sodium ethoxide?
A.
Butane
B.
Ethyl butyl ether
C.
1-butene
D.
2-butene
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Solution
The reaction of 1-bromobutane with sodium ethoxide leads to the formation of ethyl butyl ether through an SN2 mechanism.
Correct Answer:
B
— Ethyl butyl ether
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Q. What is the major product of the reaction of 1-butene with HBr?
A.
1-bromobutane
B.
2-bromobutane
C.
Butane
D.
Bromobenzene
Show solution
Solution
The major product of the reaction of 1-butene with HBr is 2-bromobutane due to Markovnikov's rule.
Correct Answer:
B
— 2-bromobutane
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Q. What is the major product of the reaction of 2-butyne with H2 in the presence of a catalyst?
A.
1-butyne
B.
butane
C.
2-butyne
D.
3-butyne
Show solution
Solution
The major product of hydrogenation of 2-butyne is butane.
Correct Answer:
B
— butane
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Q. What is the major product of the reaction of propene with HBr?
A.
1-Bromopropane
B.
2-Bromopropane
C.
Propyl bromide
D.
Bromopropene
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Solution
The major product of the reaction of propene with HBr is 2-bromopropane due to Markovnikov's rule.
Correct Answer:
B
— 2-Bromopropane
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Q. What is the major product when 1-bromobutane reacts with sodium ethoxide in ethanol?
A.
1-ethoxybutane
B.
2-ethoxybutane
C.
butane
D.
butyl ethyl ether
Show solution
Solution
The reaction is an example of an SN2 reaction, leading to the formation of 1-ethoxybutane.
Correct Answer:
A
— 1-ethoxybutane
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Q. What is the major product when propene is treated with bromine?
A.
1-bromopropane
B.
2-bromopropane
C.
Bromopropane
D.
No reaction
Show solution
Solution
The major product of the reaction of propene with bromine is 2-bromopropane due to anti-addition.
Correct Answer:
B
— 2-bromopropane
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Q. What is the major product when propene reacts with HBr?
A.
1-Bromopropane
B.
2-Bromopropane
C.
Propyl bromide
D.
Bromopropene
Show solution
Solution
The major product of the reaction of propene with HBr is 2-Bromopropane due to Markovnikov's rule.
Correct Answer:
B
— 2-Bromopropane
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Q. What is the majority charge carrier in a P-type semiconductor?
A.
Electrons
B.
Holes
C.
Neutrons
D.
Protons
Show solution
Solution
In a P-type semiconductor, holes are the majority charge carriers.
Correct Answer:
B
— Holes
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Q. What is the mass defect in a nucleus?
A.
The difference between the mass of the nucleus and the sum of the masses of its nucleons
B.
The mass of the nucleus itself
C.
The mass of the electrons surrounding the nucleus
D.
The mass of the binding energy
Show solution
Solution
The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons.
Correct Answer:
A
— The difference between the mass of the nucleus and the sum of the masses of its nucleons
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Q. What is the mass of 0.25 moles of glucose (C6H12O6)? (Molar mass = 180 g/mol)
A.
45 g
B.
90 g
C.
60 g
D.
75 g
Show solution
Solution
Mass = moles × molar mass = 0.25 moles × 180 g/mol = 45 g.
Correct Answer:
B
— 90 g
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Q. What is the mass of 0.5 moles of CaCO3?
A.
50 g
B.
25 g
C.
100 g
D.
75 g
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Solution
Molar mass of CaCO3 = 40 + 12 + 16*3 = 100 g/mol. Mass = moles x molar mass = 0.5 moles x 100 g/mol = 50 g.
Correct Answer:
B
— 25 g
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Q. What is the mass of 0.5 moles of NaCl?
A.
29 g
B.
58 g
C.
14 g
D.
0.5 g
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Solution
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol. Mass = moles x molar mass = 0.5 moles x 58.5 g/mol = 29.25 g.
Correct Answer:
A
— 29 g
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Q. What is the mass of 0.5 moles of sodium chloride (NaCl)?
A.
29 g
B.
35 g
C.
58 g
D.
70 g
Show solution
Solution
The molar mass of NaCl is 58 g/mol. Therefore, 0.5 moles of NaCl = 0.5 x 58 g = 29 g.
Correct Answer:
C
— 58 g
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Q. What is the mass of 0.75 moles of sulfuric acid (H2SO4)?
A.
75 g
B.
98 g
C.
147 g
D.
50 g
Show solution
Solution
Molar mass of H2SO4 = 2*1 + 32 + 4*16 = 98 g/mol. Mass = moles x molar mass = 0.75 moles x 98 g/mol = 73.5 g.
Correct Answer:
B
— 98 g
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Q. What is the mass of 1 mole of water (H2O)?
A.
18 g
B.
16 g
C.
20 g
D.
22 g
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Solution
The molar mass of water (H2O) is 18 g/mol (2*1 for H + 16 for O).
Correct Answer:
A
— 18 g
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Q. What is the mass of 2 moles of carbon dioxide (CO2)?
A.
44 g
B.
22 g
C.
88 g
D.
66 g
Show solution
Solution
The molar mass of CO2 is 12 g/mol (C) + 16 g/mol x 2 (O) = 44 g/mol. Therefore, 2 moles of CO2 weigh 2 x 44 g = 88 g.
Correct Answer:
A
— 44 g
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Q. What is the mass of 2 moles of sulfuric acid (H2SO4)?
A.
98 g
B.
196 g
C.
294 g
D.
392 g
Show solution
Solution
Molar mass of H2SO4 = 2*1 + 32 + 4*16 = 98 g/mol. Mass = 2 moles x 98 g/mol = 196 g.
Correct Answer:
B
— 196 g
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