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 primary cause of viscosity in fluids?
A.
Molecular interactions
B.
Temperature
C.
Pressure
D.
Density
Show solution
Solution
Viscosity arises primarily from molecular interactions within the fluid, which resist flow.
Correct Answer:
A
— Molecular interactions
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Q. What is the primary characteristic of liquids that distinguishes them from solids?
A.
Definite shape
B.
Definite volume
C.
Incompressibility
D.
Fluidity
Show solution
Solution
Liquids have fluidity, allowing them to flow and take the shape of their container.
Correct Answer:
D
— Fluidity
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Q. What is the primary charge carrier in n-type semiconductors?
A.
Holes
B.
Electrons
C.
Protons
D.
Neutrons
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Solution
In n-type semiconductors, electrons are the majority charge carriers due to the addition of donor impurities.
Correct Answer:
B
— Electrons
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Q. What is the primary charge carrier in P-type semiconductors?
A.
Electrons
B.
Holes
C.
Protons
D.
Neutrons
Show solution
Solution
In P-type semiconductors, holes are the primary charge carriers.
Correct Answer:
B
— Holes
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Q. What is the primary driving force for adsorption in physisorption?
A.
Chemical bonds
B.
Van der Waals forces
C.
Hydrogen bonds
D.
Ionic interactions
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Solution
Physisorption is primarily driven by weak van der Waals forces.
Correct Answer:
B
— Van der Waals forces
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Q. What is the primary effect of a -CN group on a benzene ring?
A.
+M effect
B.
-M effect
C.
+I effect
D.
-I effect
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Solution
-CN exhibits a -M effect as it withdraws electron density through resonance.
Correct Answer:
B
— -M effect
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Q. What is the primary effect of the -COOH group on a benzene ring?
A.
+M effect
B.
-M effect
C.
+I effect
D.
-I effect
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Solution
The -COOH group primarily exhibits a -M effect as it withdraws electron density through resonance.
Correct Answer:
B
— -M effect
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Q. What is the primary effect of the -COOH group on aromatic compounds?
A.
+M effect
B.
-M effect
C.
+I effect
D.
-I effect
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Solution
-COOH exhibits a -M effect as it withdraws electron density through resonance.
Correct Answer:
B
— -M effect
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Q. What is the primary effect of the inductive effect in organic compounds?
A.
Stabilization of positive charge
B.
Stabilization of negative charge
C.
Delocalization of electrons
D.
Formation of hydrogen bonds
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Solution
The inductive effect involves the shifting of electron density through sigma bonds, which stabilizes positive charges.
Correct Answer:
A
— Stabilization of positive charge
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Q. What is the primary effect of the inductive effect in organic molecules?
A.
Stabilization of positive charge
B.
Stabilization of negative charge
C.
Delocalization of electrons
D.
Formation of hydrogen bonds
Show solution
Solution
The inductive effect involves the shifting of electron density through sigma bonds, which can stabilize positive charges.
Correct Answer:
A
— Stabilization of positive charge
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Q. What is the primary factor affecting colligative properties?
A.
Nature of solute
B.
Concentration of solute
C.
Temperature
D.
Volume of solvent
Show solution
Solution
Colligative properties depend primarily on the concentration of solute particles in a solution.
Correct Answer:
B
— Concentration of solute
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Q. What is the primary factor affecting the rate of heat transfer by conduction?
A.
Surface area
B.
Temperature difference
C.
Material properties
D.
All of the above
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Solution
All of the above factors affect the rate of heat transfer by conduction.
Correct Answer:
D
— All of the above
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Q. What is the primary factor that affects the rate of a chemical reaction?
A.
Concentration
B.
Temperature
C.
Catalyst
D.
All of the above
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Solution
All of the above factors affect the rate of a chemical reaction.
Correct Answer:
D
— All of the above
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Q. What is the primary factor that affects the rate of adsorption of a gas on a solid surface?
A.
Temperature
B.
Pressure
C.
Surface area of the adsorbent
D.
Nature of the gas
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Solution
The rate of adsorption is primarily affected by the surface area of the adsorbent, as a larger surface area provides more sites for adsorption.
Correct Answer:
C
— Surface area of the adsorbent
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Q. What is the primary factor that affects the state of matter of a substance?
A.
Temperature
B.
Color
C.
Mass
D.
Volume
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Solution
Temperature is the primary factor that affects the state of matter by influencing kinetic energy.
Correct Answer:
A
— Temperature
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Q. What is the primary factor that affects the viscosity of a gas?
A.
Temperature
B.
Pressure
C.
Density
D.
Molecular weight
Show solution
Solution
The viscosity of a gas is primarily affected by temperature; as temperature increases, viscosity also increases.
Correct Answer:
A
— Temperature
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Q. What is the primary factor that determines the color of coordination compounds?
A.
Nature of the metal ion
B.
Nature of the ligands
C.
Geometry of the complex
D.
All of the above
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Solution
The color of coordination compounds is influenced by the metal ion, ligands, and geometry, affecting d-d transitions.
Correct Answer:
D
— All of the above
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Q. What is the primary factor that determines the viscosity of a fluid?
A.
Temperature
B.
Pressure
C.
Density
D.
Molecular size
Show solution
Solution
Viscosity is primarily affected by temperature; as temperature increases, viscosity generally decreases.
Correct Answer:
A
— Temperature
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Q. What is the primary force acting on a satellite in a stable orbit around the Earth?
A.
Gravitational force
B.
Electromagnetic force
C.
Frictional force
D.
Centrifugal force
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Solution
A satellite in a stable orbit is primarily influenced by the gravitational force exerted by the Earth.
Correct Answer:
A
— Gravitational force
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Q. What is the primary force that holds the nucleus of an atom together?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
Show solution
Solution
The strong nuclear force is the primary force that holds protons and neutrons together in the nucleus.
Correct Answer:
C
— Strong nuclear force
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Q. What is the primary force that holds the nucleus together?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
Show solution
Solution
The strong nuclear force is the primary force that holds the protons and neutrons together in the nucleus.
Correct Answer:
C
— Strong nuclear force
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Q. What is the primary force that holds the protons and neutrons together in the nucleus?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
Show solution
Solution
The strong nuclear force is the primary force that holds protons and neutrons together in the nucleus, overcoming the electromagnetic repulsion between protons.
Correct Answer:
C
— Strong nuclear force
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Q. What is the primary function of a cathode in an electrochemical cell?
A.
To oxidize species
B.
To reduce species
C.
To provide electrons
D.
To balance charge
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Solution
The cathode is where reduction occurs, gaining electrons in the process.
Correct Answer:
B
— To reduce species
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Q. What is the primary function of a diode in a circuit?
A.
Amplification
B.
Rectification
C.
Capacitance
D.
Inductance
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Solution
The primary function of a diode is rectification, allowing current to flow in one direction only.
Correct Answer:
B
— Rectification
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Q. What is the primary function of a modulator in a communication system?
A.
To amplify the signal
B.
To convert the signal into a suitable form for transmission
C.
To demodulate the received signal
D.
To filter out noise
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Solution
A modulator converts the baseband signal into a form suitable for transmission over a communication channel.
Correct Answer:
B
— To convert the signal into a suitable form for transmission
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Q. What is the primary function of a salt bridge in a galvanic cell?
A.
To provide a path for electrons
B.
To maintain charge balance
C.
To increase voltage
D.
To decrease resistance
Show solution
Solution
The primary function of a salt bridge is to maintain charge balance by allowing ions to flow between the half-cells.
Correct Answer:
B
— To maintain charge balance
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Q. What is the primary function of a transistor in semiconductor technology?
A.
Switching
B.
Storage
C.
Transmission
D.
Resistance
Show solution
Solution
The primary function of a transistor is switching, allowing it to control electrical signals.
Correct Answer:
A
— Switching
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Q. What is the primary function of a transistor?
A.
Rectification
B.
Amplification
C.
Capacitance
D.
Inductance
Show solution
Solution
The primary function of a transistor is amplification of electrical signals.
Correct Answer:
B
— Amplification
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Q. What is the primary function of a transponder in satellite communication?
A.
To amplify the signal
B.
To receive and retransmit signals
C.
To modulate the signal
D.
To filter out noise
Show solution
Solution
A transponder in satellite communication receives signals from the ground, processes them, and retransmits them back to Earth.
Correct Answer:
B
— To receive and retransmit signals
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Q. What is the primary function of an antenna in a communication system?
A.
To amplify the signal
B.
To convert electrical signals into electromagnetic waves
C.
To modulate the signal
D.
To demodulate the signal
Show solution
Solution
An antenna converts electrical signals into electromagnetic waves for transmission and vice versa for reception.
Correct Answer:
B
— To convert electrical signals into electromagnetic waves
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