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 type of reaction occurs when an amine is treated with a haloalkane?
A.
Nucleophilic substitution
B.
Electrophilic addition
C.
Elimination
D.
Oxidation
Show solution
Solution
The reaction between an amine and a haloalkane is a nucleophilic substitution reaction.
Correct Answer:
A
— Nucleophilic substitution
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Q. What type of reaction occurs when an amine reacts with a nitrous acid?
A.
Substitution
B.
Elimination
C.
Decomposition
D.
Diazotization
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Solution
The reaction of an amine with nitrous acid leads to diazotization, forming a diazonium salt.
Correct Answer:
D
— Diazotization
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Q. What type of reaction occurs when chlorobenzene is treated with sodium hydroxide at high temperature?
A.
Nucleophilic substitution
B.
Electrophilic substitution
C.
Elimination
D.
Addition
Show solution
Solution
Chlorobenzene undergoes nucleophilic substitution to form phenol when treated with sodium hydroxide at high temperature.
Correct Answer:
A
— Nucleophilic substitution
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Q. What type of reaction occurs when haloalkanes react with alcoholic KOH?
A.
Nucleophilic substitution
B.
Elimination
C.
Addition
D.
Redox
Show solution
Solution
Haloalkanes react with alcoholic KOH primarily through nucleophilic substitution to form alcohols.
Correct Answer:
B
— Elimination
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Q. What type of reaction occurs when phenol is treated with sodium hydroxide?
A.
Neutralization
B.
Esterification
C.
Saponification
D.
Nucleophilic substitution
Show solution
Solution
Phenol reacts with sodium hydroxide in a nucleophilic substitution reaction to form phenoxide ion.
Correct Answer:
D
— Nucleophilic substitution
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Q. What type of reaction occurs when phenol is treated with sodium metal?
A.
Oxidation
B.
Reduction
C.
Esterification
D.
Wurtz reaction
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Solution
The reaction of phenol with sodium metal leads to the formation of biphenyl through the Wurtz reaction.
Correct Answer:
D
— Wurtz reaction
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Q. What type of reaction occurs when two amino acids form a peptide bond?
A.
Hydrolysis
B.
Condensation
C.
Redox
D.
Substitution
Show solution
Solution
The formation of a peptide bond between two amino acids is a condensation reaction, releasing water.
Correct Answer:
B
— Condensation
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Q. What type of semiconductor behavior is exhibited by a material with a very small band gap?
A.
Insulator
B.
Conductor
C.
Superconductor
D.
Semiconductor
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Solution
A material with a very small band gap behaves like a semiconductor, allowing some charge carriers to be thermally excited.
Correct Answer:
D
— Semiconductor
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Q. What type of semiconductor is formed when silicon is doped with phosphorus?
A.
p-type
B.
n-type
C.
Intrinsic
D.
Superconductor
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Solution
Doping silicon with phosphorus creates an n-type semiconductor due to the extra electrons contributed by phosphorus.
Correct Answer:
B
— n-type
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Q. What type of solutions does Raoult's Law apply to most accurately?
A.
Ideal solutions
B.
Non-ideal solutions
C.
Concentrated solutions
D.
Dilute solutions
Show solution
Solution
Raoult's Law applies most accurately to ideal solutions, where interactions between different molecules are similar to those in pure substances.
Correct Answer:
A
— Ideal solutions
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Q. What type of solutions does Raoult's Law apply to?
A.
Ideal solutions only.
B.
Non-ideal solutions only.
C.
Both ideal and non-ideal solutions.
D.
Concentrated solutions only.
Show solution
Solution
Raoult's Law applies primarily to ideal solutions, where the interactions between different molecules are similar to those in pure substances.
Correct Answer:
A
— Ideal solutions only.
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Q. What type of structure do cross-linked polymers have?
A.
Linear
B.
Branched
C.
Network
D.
Cyclic
Show solution
Solution
Cross-linked polymers have a network structure due to the presence of covalent bonds between chains.
Correct Answer:
C
— Network
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Q. What type of structure do most synthetic polymers have?
A.
Linear
B.
Branched
C.
Cross-linked
D.
All of the above
Show solution
Solution
Most synthetic polymers can have linear, branched, or cross-linked structures depending on their synthesis.
Correct Answer:
D
— All of the above
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Q. What type of structure do most thermoplastics have?
A.
Cross-linked structure
B.
Linear or branched structure
C.
Crystalline structure
D.
Amorphous structure
Show solution
Solution
Most thermoplastics have a linear or branched structure, allowing them to be remolded upon heating.
Correct Answer:
B
— Linear or branched structure
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Q. What type of wave is a sound wave?
A.
Transverse wave
B.
Longitudinal wave
C.
Surface wave
D.
Electromagnetic wave
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Solution
Sound waves are longitudinal waves, where the particle displacement is parallel to the direction of wave propagation.
Correct Answer:
B
— Longitudinal wave
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Q. What type of wave is characterized by particle motion being perpendicular to wave motion?
A.
Longitudinal wave
B.
Transverse wave
C.
Surface wave
D.
Standing wave
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Solution
In a transverse wave, the particle motion is perpendicular to the direction of wave propagation.
Correct Answer:
B
— Transverse wave
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Q. What type of wave is produced by a vibrating string?
A.
Longitudinal wave
B.
Transverse wave
C.
Surface wave
D.
Electromagnetic wave
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Solution
A vibrating string produces transverse waves, where the displacement of the medium is perpendicular to the direction of wave propagation.
Correct Answer:
B
— Transverse wave
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Q. What type of wave is produced when a tuning fork is struck and vibrates?
A.
Transverse wave
B.
Longitudinal wave
C.
Surface wave
D.
Electromagnetic wave
Show solution
Solution
A tuning fork produces longitudinal waves, where the displacement of the medium is parallel to the direction of wave propagation.
Correct Answer:
B
— Longitudinal wave
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Q. What type of wave is produced when a tuning fork is struck?
A.
Transverse wave
B.
Longitudinal wave
C.
Surface wave
D.
Standing wave
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Solution
A tuning fork produces longitudinal waves in the air as it vibrates back and forth, creating compressions and rarefactions.
Correct Answer:
B
— Longitudinal wave
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Q. What type of wave is produced when a tuning fork vibrates in air?
A.
Transverse wave
B.
Longitudinal wave
C.
Surface wave
D.
Electromagnetic wave
Show solution
Solution
A tuning fork produces longitudinal waves in air, where the particles of the medium vibrate parallel to the direction of wave propagation.
Correct Answer:
B
— Longitudinal wave
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Q. What type of wave is produced when a tuning fork vibrates?
A.
Transverse wave
B.
Longitudinal wave
C.
Surface wave
D.
Electromagnetic wave
Show solution
Solution
A tuning fork produces longitudinal waves, as the vibrations cause compressions and rarefactions in the air.
Correct Answer:
B
— Longitudinal wave
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Q. What type of wave is sound classified as?
A.
Transverse wave
B.
Longitudinal wave
C.
Surface wave
D.
Electromagnetic wave
Show solution
Solution
Sound is classified as a longitudinal wave, where the particle displacement is parallel to the direction of wave propagation.
Correct Answer:
B
— Longitudinal wave
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Q. What value of a makes the function f(x) = { 2x + 1, x < 1; a, x = 1; x^2 + 1, x > 1 continuous at x = 1?
Show solution
Solution
Setting 2(1) + 1 = a and a = 2 for continuity.
Correct Answer:
B
— 2
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Q. What value of a makes the function f(x) = { 2x + a, x < 3; 5, x = 3; x^2 - 1, x > 3 continuous at x = 3?
Show solution
Solution
Setting 2(3) + a = 5 gives a = -1.
Correct Answer:
C
— 2
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Q. What value of a makes the function f(x) = { 4 - x^2, x < 0; ax + 2, x = 0; x + 1, x > 0 continuous at x = 0?
Show solution
Solution
Setting 4 = 2 gives a = 1 for continuity.
Correct Answer:
B
— 0
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Q. What value of k makes the function f(x) = { kx, x < 1; 2, x = 1; x + 1, x > 1 continuous at x = 1?
Show solution
Solution
Setting the left limit (k(1) = k) equal to the right limit (1 + 1 = 2), we find k = 2.
Correct Answer:
B
— 1
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Q. What value of m makes the function f(x) = { 3x + 1, x < 2; mx + 4, x = 2; x^2 - 1, x > 2 continuous at x = 2?
Show solution
Solution
Setting the left limit (3(2) + 1 = 7) equal to the right limit (2^2 - 1 = 3), we find m = 3.
Correct Answer:
D
— 4
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Q. What volume of 0.5 M HCl is required to completely react with 0.1 moles of Na2CO3?
A.
200 mL
B.
400 mL
C.
100 mL
D.
300 mL
Show solution
Solution
The reaction is Na2CO3 + 2 HCl → 2 NaCl + H2O + CO2. 0.1 moles of Na2CO3 requires 0.2 moles of HCl. Volume = moles / concentration = 0.2 moles / 0.5 M = 0.4 L or 400 mL.
Correct Answer:
B
— 400 mL
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Q. What volume of 0.5 M NaCl solution contains 1 mole of NaCl?
A.
1 L
B.
2 L
C.
0.5 L
D.
0.25 L
Show solution
Solution
Using the formula Molarity (M) = moles/volume (L), we have 0.5 M = 1 mole/volume. Therefore, volume = 1 mole / 0.5 M = 2 L.
Correct Answer:
A
— 1 L
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Q. What volume of 0.5 M NaOH solution contains 1 mole of NaOH?
A.
1 L
B.
2 L
C.
0.5 L
D.
0.25 L
Show solution
Solution
Using the formula Molarity (M) = moles/volume (L), we rearrange to find volume = moles/Molarity. Thus, volume = 1 mole / 0.5 M = 2 L.
Correct Answer:
A
— 1 L
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