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. In which of the following processes does heat transfer occur without any medium?
A.
Conduction
B.
Convection
C.
Radiation
D.
None of the above
Show solution
Solution
Radiation is the process of heat transfer that occurs without any medium.
Correct Answer:
C
— Radiation
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Q. In which of the following processes does the internal energy of a system remain constant?
A.
Isothermal process
B.
Adiabatic process
C.
Isobaric process
D.
Isochoric process
Show solution
Solution
In an isothermal process, the internal energy of an ideal gas remains constant.
Correct Answer:
A
— Isothermal process
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Q. In which of the following processes does the temperature of a gas increase?
A.
Isothermal expansion
B.
Adiabatic compression
C.
Isobaric expansion
D.
Isochoric cooling
Show solution
Solution
In adiabatic compression, the temperature of a gas increases due to work done on it.
Correct Answer:
B
— Adiabatic compression
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Q. In which of the following processes does the temperature of a substance remain constant?
A.
Heating
B.
Cooling
C.
Phase change
D.
Compression
Show solution
Solution
During a phase change, the temperature of a substance remains constant despite heat being added or removed.
Correct Answer:
C
— Phase change
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Q. In which of the following processes does the temperature of the system remain constant?
A.
Isothermal process
B.
Adiabatic process
C.
Isobaric process
D.
Isochoric process
Show solution
Solution
In an isothermal process, the temperature of the system remains constant.
Correct Answer:
A
— Isothermal process
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Q. In which of the following reactions is the enthalpy change likely to be the largest?
A.
Dissolving salt in water
B.
Combustion of gasoline
C.
Melting of ice
D.
Sublimation of dry ice
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Solution
The combustion of gasoline releases a large amount of energy, resulting in a large enthalpy change.
Correct Answer:
B
— Combustion of gasoline
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Q. In which of the following reactions is the entropy change expected to be negative?
A.
N2(g) + 3H2(g) → 2NH3(g)
B.
C(s) + O2(g) → CO2(g)
C.
2H2(g) + O2(g) → 2H2O(g)
D.
CaCO3(s) → CaO(s) + CO2(g)
Show solution
Solution
The reaction N2(g) + 3H2(g) → 2NH3(g) results in a decrease in the number of gas molecules, leading to a negative change in entropy.
Correct Answer:
A
— N2(g) + 3H2(g) → 2NH3(g)
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Q. In which of the following scenarios does a liquid exhibit the highest boiling point?
A.
High molecular weight and strong intermolecular forces
B.
Low molecular weight and weak intermolecular forces
C.
High molecular weight and weak intermolecular forces
D.
Low molecular weight and strong intermolecular forces
Show solution
Solution
A liquid with high molecular weight and strong intermolecular forces will have a higher boiling point.
Correct Answer:
A
— High molecular weight and strong intermolecular forces
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Q. In which of the following scenarios does a liquid exhibit the highest density?
A.
At its boiling point
B.
At its freezing point
C.
At room temperature
D.
At its critical point
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Solution
A liquid typically exhibits the highest density at room temperature, as it is not at the extremes of phase change.
Correct Answer:
D
— At its critical point
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Q. In which of the following scenarios does a material exhibit elastic behavior?
A.
When it returns to its original shape after removing the load
B.
When it permanently deforms
C.
When it breaks
D.
When it undergoes plastic deformation
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Solution
A material exhibits elastic behavior when it returns to its original shape after the load is removed.
Correct Answer:
A
— When it returns to its original shape after removing the load
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Q. In which of the following scenarios does a material exhibit plastic deformation?
A.
When the stress is below the yield point
B.
When the stress exceeds the yield point
C.
When the material is unloaded
D.
When the material is cooled
Show solution
Solution
Plastic deformation occurs when the stress exceeds the yield point of the material.
Correct Answer:
B
— When the stress exceeds the yield point
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Q. In which of the following scenarios does a satellite experience weightlessness?
A.
When it is stationary on the ground
B.
When it is in free fall
C.
When it is at rest in space
D.
When it is moving at constant speed
Show solution
Solution
A satellite experiences weightlessness when it is in free fall, as both the satellite and its occupants are accelerating towards the Earth at the same rate.
Correct Answer:
B
— When it is in free fall
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Q. In which of the following scenarios does conduction occur?
A.
Heating water in a pot
B.
Sun warming the Earth
C.
Wind blowing
D.
Ice melting in a drink
Show solution
Solution
Conduction occurs when heat is transferred through direct contact, such as heating water in a pot.
Correct Answer:
A
— Heating water in a pot
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Q. In which of the following scenarios does elastic deformation occur?
A.
A rubber band being stretched
B.
A metal rod being permanently bent
C.
A glass breaking
D.
A clay being molded
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Solution
Elastic deformation occurs when the rubber band is stretched and returns to its original shape.
Correct Answer:
A
— A rubber band being stretched
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Q. In which of the following scenarios does light become polarized by reflection?
A.
When it passes through a prism
B.
When it reflects off a smooth surface at a specific angle
C.
When it travels through a foggy medium
D.
When it is diffracted through a narrow slit
Show solution
Solution
Light becomes polarized by reflection when it reflects off a smooth surface at Brewster's angle.
Correct Answer:
B
— When it reflects off a smooth surface at a specific angle
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Q. In which of the following scenarios does light become polarized?
A.
When it passes through a prism
B.
When it reflects off a non-metallic surface
C.
When it travels through a vacuum
D.
When it diffracts through a slit
Show solution
Solution
Light becomes polarized when it reflects off a non-metallic surface, as the reflected light tends to align in a particular direction.
Correct Answer:
B
— When it reflects off a non-metallic surface
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Q. In which of the following scenarios does viscosity increase?
A.
Heating a fluid
B.
Cooling a fluid
C.
Adding a solvent
D.
Increasing pressure
Show solution
Solution
Viscosity generally increases when a fluid is cooled.
Correct Answer:
B
— Cooling a fluid
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Q. In which of the following scenarios is light most likely to be polarized?
A.
When it passes through a prism
B.
When it reflects off a smooth surface
C.
When it travels through a vacuum
D.
When it diffracts through a narrow slit
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Solution
Light is most likely to be polarized when it reflects off a smooth surface, such as water or glass.
Correct Answer:
B
— When it reflects off a smooth surface
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Q. In which of the following scenarios is light polarized?
A.
Light from a candle
B.
Light from a laser
C.
Light from an incandescent bulb
D.
Light from a fluorescent lamp
Show solution
Solution
Light from a laser is typically polarized, while the other sources emit unpolarized light.
Correct Answer:
B
— Light from a laser
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Q. In which of the following scenarios is the entropy of the system likely to decrease?
A.
Ice melting
B.
Water freezing
C.
Gas expanding
D.
Liquid evaporating
Show solution
Solution
The entropy of the system decreases when water freezes, as the molecules become more ordered in the solid state.
Correct Answer:
B
— Water freezing
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Q. In which of the following scenarios is the magnetic force on a charged particle zero?
A.
When the particle is at rest
B.
When the particle moves parallel to the magnetic field
C.
When the particle moves perpendicular to the magnetic field
D.
Both 1 and 2
Show solution
Solution
The magnetic force on a charged particle is zero when it is at rest or when it moves parallel to the magnetic field.
Correct Answer:
D
— Both 1 and 2
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Q. In which of the following scenarios is ΔG equal to ΔH?
A.
At high temperatures with ΔS = 0.
B.
At low temperatures with ΔS = 0.
C.
At constant pressure and temperature.
D.
In a phase transition.
Show solution
Solution
During a phase transition, such as melting or boiling, ΔG equals ΔH because the system is at equilibrium.
Correct Answer:
D
— In a phase transition.
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Q. In which of the following scenarios will a charged particle experience no magnetic force?
A.
When moving parallel to the magnetic field
B.
When moving perpendicular to the magnetic field
C.
When at rest
D.
Both A and C
Show solution
Solution
A charged particle experiences no magnetic force when it is either at rest or moving parallel to the magnetic field.
Correct Answer:
D
— Both A and C
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Q. In which of the following scenarios will a charged particle experience the maximum magnetic force?
A.
When moving parallel to the magnetic field
B.
When moving perpendicular to the magnetic field
C.
When at rest
D.
When moving at an angle of 45 degrees
Show solution
Solution
A charged particle experiences maximum magnetic force when moving perpendicular to the magnetic field, as sin(90°) = 1.
Correct Answer:
B
— When moving perpendicular to the magnetic field
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Q. In which of the following scenarios will a charged particle not experience any magnetic force?
A.
When moving parallel to the magnetic field
B.
When moving perpendicular to the magnetic field
C.
When at rest
D.
Both a and c
Show solution
Solution
A charged particle will not experience any magnetic force when it is at rest or moving parallel to the magnetic field.
Correct Answer:
D
— Both a and c
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Q. In which of the following scenarios will a magnetic field be produced?
A.
A stationary charge
B.
A moving charge
C.
A neutral atom
D.
A charged particle at rest
Show solution
Solution
A magnetic field is produced by a moving charge. A stationary charge does not produce a magnetic field.
Correct Answer:
B
— A moving charge
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Q. In which of the following scenarios will total internal reflection NOT occur?
A.
Light traveling from diamond to air
B.
Light traveling from water to air
C.
Light traveling from air to glass
D.
Light traveling from glass to air
Show solution
Solution
Total internal reflection cannot occur when light travels from a rarer medium (air) to a denser medium (glass).
Correct Answer:
C
— Light traveling from air to glass
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Q. In which of the following scenarios will total internal reflection occur?
A.
Light from air to water
B.
Light from glass to air
C.
Light from water to glass
D.
Light from air to glass
Show solution
Solution
Total internal reflection occurs when light travels from a denser medium (glass) to a less dense medium (air) at an angle greater than the critical angle.
Correct Answer:
B
— Light from glass to air
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Q. In which of the following scenarios would the entropy of the system decrease?
A.
Ice melting
B.
Water evaporating
C.
Gas compressing
D.
Sugar dissolving in water
Show solution
Solution
When a gas is compressed, the number of microstates decreases, leading to a decrease in entropy.
Correct Answer:
C
— Gas compressing
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Q. In which of the following scenarios would total internal reflection NOT occur?
A.
Light traveling from diamond to air.
B.
Light traveling from water to air.
C.
Light traveling from air to glass.
D.
Light traveling from glass to water.
Show solution
Solution
Total internal reflection cannot occur when light travels from a rarer medium (air) to a denser medium (glass).
Correct Answer:
C
— Light traveling from air to glass.
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