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 effect of increasing temperature on the rate of a chemical reaction?
A.
Decreases the rate
B.
Increases the rate
C.
No effect
D.
Depends on the reaction
Show solution
Solution
Increasing temperature generally increases the rate of a chemical reaction.
Correct Answer:
B
— Increases the rate
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Q. What is the effect of increasing temperature on the solubility of most solid solutes in water?
A.
Increases solubility
B.
Decreases solubility
C.
No effect
D.
Depends on the solute
Show solution
Solution
For most solid solutes, increasing temperature increases solubility in water.
Correct Answer:
A
— Increases solubility
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Q. What is the effect of increasing temperature on the speed of sound in air?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on pressure
Show solution
Solution
Increasing temperature increases the speed of sound in air.
Correct Answer:
A
— Increases
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Q. What is the effect of increasing temperature on the vapor pressure of a liquid?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It fluctuates
Show solution
Solution
Increasing temperature increases the kinetic energy of the molecules, leading to an increase in vapor pressure.
Correct Answer:
C
— It increases
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Q. What is the effect of increasing temperature on the vapor pressure of a solution?
A.
It decreases the vapor pressure.
B.
It increases the vapor pressure.
C.
It has no effect.
D.
It causes the vapor pressure to become zero.
Show solution
Solution
Increasing temperature generally increases the vapor pressure of a solution due to increased kinetic energy of the molecules.
Correct Answer:
B
— It increases the vapor pressure.
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Q. What is the effect of increasing temperature on the vapor pressure of a solvent according to Raoult's Law?
A.
It decreases the vapor pressure.
B.
It increases the vapor pressure.
C.
It has no effect.
D.
It depends on the solute.
Show solution
Solution
Increasing temperature generally increases the vapor pressure of a solvent, as more molecules have enough energy to escape into the vapor phase.
Correct Answer:
B
— It increases the vapor pressure.
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Q. What is the effect of increasing temperature on the viscosity of a liquid?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on the liquid
Show solution
Solution
Increasing temperature generally decreases the viscosity of a liquid.
Correct Answer:
B
— Decreases viscosity
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Q. What is the effect of increasing tension on the speed of a wave traveling along a string?
A.
Increases speed
B.
Decreases speed
C.
No effect
D.
Depends on the mass
Show solution
Solution
Increasing tension in the string increases the speed of the wave.
Correct Answer:
A
— Increases speed
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Q. What is the effect of increasing the altitude of a satellite on its orbital period?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
According to Kepler's third law, increasing the altitude of a satellite increases its orbital period.
Correct Answer:
B
— It increases
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Q. What is the effect of increasing the amplitude of a sound wave?
A.
Increases pitch
B.
Increases loudness
C.
Decreases frequency
D.
Decreases speed
Show solution
Solution
Increasing the amplitude of a sound wave increases its loudness.
Correct Answer:
B
— Increases loudness
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Q. What is the effect of increasing the amplitude of a wave?
A.
Increases frequency
B.
Increases speed
C.
Increases energy
D.
Decreases wavelength
Show solution
Solution
Increasing the amplitude of a wave increases its energy, as energy is proportional to the square of the amplitude.
Correct Answer:
C
— Increases energy
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Q. What is the effect of increasing the angle of incidence beyond the critical angle?
A.
Increased refraction
B.
Decreased reflection
C.
Total internal reflection
D.
No effect
Show solution
Solution
Increasing the angle of incidence beyond the critical angle results in total internal reflection, preventing any refraction into the second medium.
Correct Answer:
C
— Total internal reflection
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Q. What is the effect of increasing the angle of incidence beyond the critical angle in total internal reflection?
A.
Increased intensity of reflected light
B.
Decreased intensity of reflected light
C.
No effect on intensity
D.
Light is transmitted into the second medium
Show solution
Solution
Increasing the angle of incidence beyond the critical angle increases the intensity of the reflected light due to total internal reflection.
Correct Answer:
A
— Increased intensity of reflected light
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Q. What is the effect of increasing the area of a loop in a uniform magnetic field on the magnetic flux?
A.
Magnetic flux increases
B.
Magnetic flux decreases
C.
Magnetic flux remains constant
D.
Magnetic flux becomes zero
Show solution
Solution
Increasing the area of the loop in a uniform magnetic field increases the magnetic flux, as magnetic flux is given by the product of the magnetic field strength and the area.
Correct Answer:
A
— Magnetic flux increases
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Q. What is the effect of increasing the bandwidth of a communication channel?
A.
Increased data rate
B.
Decreased data rate
C.
No effect on data rate
D.
Increased noise
Show solution
Solution
Increasing the bandwidth allows for a higher data rate.
Correct Answer:
A
— Increased data rate
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Q. What is the effect of increasing the capacitance in a capacitor in an AC circuit on the current?
A.
Increases current
B.
Decreases current
C.
No effect
D.
Current becomes zero
Show solution
Solution
Increasing the capacitance (C) decreases the capacitive reactance (X_C), which increases the current (I) in the circuit.
Correct Answer:
A
— Increases current
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Q. What is the effect of increasing the capacitance in an AC circuit on the capacitive reactance?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Capacitive reactance (X_C) is given by X_C = 1/(2πfC). Increasing capacitance (C) decreases X_C.
Correct Answer:
B
— Decreases
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Q. What is the effect of increasing the capacitance in an AC circuit on the phase angle between voltage and current?
A.
Increases phase angle
B.
Decreases phase angle
C.
No effect
D.
Phase angle becomes 90 degrees
Show solution
Solution
Increasing capacitance decreases the phase angle between voltage and current in an AC circuit.
Correct Answer:
B
— Decreases phase angle
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Q. What is the effect of increasing the carbon chain length on the acidity of carboxylic acids?
A.
Increases acidity
B.
Decreases acidity
C.
No effect
D.
Varies with structure
Show solution
Solution
Increasing the carbon chain length generally decreases the acidity of carboxylic acids due to the inductive effect.
Correct Answer:
B
— Decreases acidity
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Q. What is the effect of increasing the carbon chain length on the boiling point of aldehydes?
A.
Decreases
B.
Increases
C.
Remains the same
D.
Varies randomly
Show solution
Solution
The boiling point of aldehydes increases with the increase in carbon chain length due to increased van der Waals forces.
Correct Answer:
B
— Increases
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Q. What is the effect of increasing the concentration of a reactant in a first-order reaction?
A.
Rate increases linearly
B.
Rate decreases
C.
Rate remains constant
D.
Rate increases exponentially
Show solution
Solution
In a first-order reaction, increasing the concentration of a reactant results in a linear increase in the rate.
Correct Answer:
A
— Rate increases linearly
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Q. What is the effect of increasing the concentration of a solute on the freezing point of a solution?
A.
Freezing point increases
B.
Freezing point decreases
C.
No effect
D.
Depends on the solute
Show solution
Solution
Increasing the concentration of a solute lowers the freezing point of a solution.
Correct Answer:
B
— Freezing point decreases
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Q. What is the effect of increasing the concentration of reactants on the rate of a reaction?
A.
Rate decreases
B.
Rate increases
C.
Rate remains constant
D.
Rate becomes zero
Show solution
Solution
Increasing the concentration of reactants generally increases the rate of a reaction.
Correct Answer:
B
— Rate increases
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Q. What is the effect of increasing the cross-sectional area of a conductor on its resistance?
A.
Increases resistance
B.
Decreases resistance
C.
No effect
D.
Depends on the material
Show solution
Solution
Increasing the cross-sectional area decreases the resistance, as R = ρ * (L / A).
Correct Answer:
B
— Decreases resistance
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Q. What is the effect of increasing the current in a coil on the magnetic field strength?
A.
Increases
B.
Decreases
C.
No effect
D.
Depends on the coil material
Show solution
Solution
Increasing the current in a coil increases the magnetic field strength, as the magnetic field is directly proportional to the current.
Correct Answer:
A
— Increases
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Q. What is the effect of increasing the current in a solenoid on the magnetic field strength inside it?
A.
Increases the magnetic field strength
B.
Decreases the magnetic field strength
C.
No effect on the magnetic field strength
D.
Reverses the direction of the magnetic field
Show solution
Solution
According to Ampere's Law, increasing the current in a solenoid increases the magnetic field strength inside it.
Correct Answer:
A
— Increases the magnetic field strength
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Q. What is the effect of increasing the current in a solenoid on the magnetic field inside it?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The magnetic field inside a solenoid is directly proportional to the current flowing through it. Therefore, increasing the current increases the magnetic field strength.
Correct Answer:
A
— Increases
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Q. What is the effect of increasing the current in a solenoid on the magnetic field strength?
A.
Decreases the magnetic field strength
B.
Increases the magnetic field strength
C.
Has no effect
D.
Reverses the magnetic field direction
Show solution
Solution
Increasing the current in a solenoid increases the magnetic field strength, as B is directly proportional to I.
Correct Answer:
B
— Increases the magnetic field strength
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Q. What is the effect of increasing the current in a wire on the magnetic field around it?
A.
Increases the magnetic field
B.
Decreases the magnetic field
C.
No effect on the magnetic field
D.
Reverses the direction of the magnetic field
Show solution
Solution
Increasing the current in a wire increases the magnetic field around it, as per the Biot-Savart Law.
Correct Answer:
A
— Increases the magnetic field
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Q. What is the effect of increasing the curvature of a lens on its focal length?
A.
Focal length increases
B.
Focal length decreases
C.
Focal length remains the same
D.
Focal length becomes zero
Show solution
Solution
Increasing the curvature of a lens decreases its focal length.
Correct Answer:
B
— Focal length decreases
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