JEE Main Preparation Resources for Competitive Exams

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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.

Chemistry Syllabus (JEE Main) Mathematics Syllabus (JEE Main) Physics Syllabus (JEE Main)

Q. What is the effect of dilution on the pH of a strong acid?

A. pH increases
B. pH decreases
C. pH remains constant
D. pH becomes neutral

Solution

Dilution of a strong acid decreases its concentration, thus increasing the pH.

Correct Answer: A — pH increases

Q. What is the effect of dilution on the pH of a weak acid solution?

A. pH decreases
B. pH increases
C. pH remains constant
D. pH becomes neutral

Solution

Dilution of a weak acid decreases its concentration, which shifts the equilibrium to the right, increasing the concentration of H+ ions and thus increasing the pH.

Correct Answer: B — pH increases

Q. What is the effect of doping a semiconductor with acceptor impurities?

A. Increases electron concentration
B. Increases hole concentration
C. Decreases conductivity
D. No effect

Solution

Doping with acceptor impurities creates holes, thus increasing the hole concentration in the semiconductor.

Correct Answer: B — Increases hole concentration

Q. What is the effect of doping a semiconductor with donor atoms?

A. Increases hole concentration
B. Increases electron concentration
C. Decreases conductivity
D. Creates a depletion region

Solution

Doping a semiconductor with donor atoms increases the electron concentration, making it n-type.

Correct Answer: B — Increases electron concentration

Q. What is the effect of doping a semiconductor with trivalent atoms?

A. Creates n-type
B. Creates p-type
C. No effect
D. Increases resistance

Solution

Doping a semiconductor with trivalent atoms creates p-type semiconductors by introducing holes.

Correct Answer: B — Creates p-type

Q. What is the effect of doping a semiconductor?

A. Increases resistance
B. Decreases resistance
C. No effect
D. Makes it an insulator

Solution

Doping a semiconductor decreases its resistance by introducing additional charge carriers.

Correct Answer: B — Decreases resistance

Q. What is the effect of doping on the conductivity of a semiconductor?

A. Decreases conductivity
B. Increases conductivity
C. No effect
D. Makes it an insulator

Solution

Doping a semiconductor increases its conductivity by introducing additional charge carriers.

Correct Answer: B — Increases conductivity

Q. What is the effect of doping on the conductivity of semiconductors?

A. Decreases conductivity
B. Increases conductivity
C. No effect
D. Makes it insulative

Solution

Doping increases the conductivity of semiconductors by introducing additional charge carriers.

Correct Answer: B — Increases conductivity

Q. What is the effect of doubling the distance from a long straight wire on the magnetic field strength?

A. It doubles the magnetic field strength
B. It halves the magnetic field strength
C. It quadruples the magnetic field strength
D. It has no effect on the magnetic field strength

Solution

According to the Biot-Savart Law, the magnetic field strength is inversely proportional to the distance, so doubling the distance halves the magnetic field strength.

Correct Answer: B — It halves the magnetic field strength

Q. What is the effect of electron-donating groups on the basicity of amines?

A. Increase basicity
B. Decrease basicity
C. No effect
D. Depends on the solvent

Solution

Electron-donating groups increase the electron density on the nitrogen atom, thus increasing the basicity of amines.

Correct Answer: A — Increase basicity

Q. What is the effect of electron-withdrawing groups on the basicity of amines?

A. Increase basicity
B. Decrease basicity
C. No effect
D. Varies with the group

Solution

Electron-withdrawing groups decrease the basicity of amines by reducing the electron density on the nitrogen atom.

Correct Answer: B — Decrease basicity

Q. What is the effect of increasing electronegativity difference on bond character?

A. Increases covalent character
B. Decreases ionic character
C. Increases ionic character
D. No effect

Solution

Increasing electronegativity difference between two atoms leads to an increase in ionic character of the bond.

Correct Answer: C — Increases ionic character

Q. What is the effect of increasing pressure on the boiling point of a liquid?

A. Boiling point decreases
B. Boiling point increases
C. No effect
D. Boiling point becomes constant

Solution

Increasing pressure raises the boiling point of a liquid.

Correct Answer: B — Boiling point increases

Q. What is the effect of increasing temperature on a reaction with a negative ΔH and positive ΔS?

A. It makes ΔG more negative.
B. It makes ΔG less negative.
C. It has no effect on ΔG.
D. It makes ΔG positive.

Solution

Increasing temperature will make ΔG more negative for a reaction with a negative ΔH and positive ΔS, enhancing spontaneity.

Correct Answer: A — It makes ΔG more negative.

Q. What is the effect of increasing temperature on a reaction with ΔH > 0 and ΔS < 0?

A. Increases spontaneity
B. Decreases spontaneity
C. No effect on spontaneity
D. Makes it spontaneous at high temperatures

Solution

For a reaction with ΔH > 0 and ΔS < 0, increasing temperature will make ΔG more positive, thus decreasing spontaneity.

Correct Answer: B — Decreases spontaneity

Q. What is the effect of increasing temperature on an exothermic reaction at equilibrium?

A. Shift to the right
B. Shift to the left
C. No change
D. Increase the rate of reaction

Solution

For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants.

Correct Answer: B — Shift to the left

Q. What is the effect of increasing temperature on physisorption?

A. Increases adsorption
B. Decreases adsorption
C. No effect
D. Depends on the adsorbate

Solution

Increasing temperature generally decreases physisorption because it disrupts the weak van der Waals forces.

Correct Answer: B — Decreases adsorption

Q. What is the effect of increasing temperature on the cell potential according to the Nernst equation?

A. Increases cell potential
B. Decreases cell potential
C. No effect
D. Depends on the reaction

Solution

The effect of increasing temperature on cell potential depends on the reaction and its enthalpy change.

Correct Answer: D — Depends on the reaction

Q. What is the effect of increasing temperature on the cell potential?

A. Increases
B. Decreases
C. Remains constant
D. Depends on the reaction

Solution

The effect of temperature on cell potential depends on the reaction and its enthalpy change.

Correct Answer: D — Depends on the reaction

Q. What is the effect of increasing temperature on the density of a gas?

A. Increases density
B. Decreases density
C. No effect
D. Depends on pressure

Solution

Increasing the temperature of a gas generally decreases its density, as the gas expands.

Correct Answer: B — Decreases density

Q. What is the effect of increasing temperature on the density of liquids?

A. Density increases
B. Density decreases
C. Density remains constant
D. Density fluctuates randomly

Solution

Generally, the density of liquids decreases with an increase in temperature.

Correct Answer: B — Density decreases

Q. What is the effect of increasing temperature on the entropy of a substance?

A. Entropy decreases
B. Entropy increases
C. Entropy remains constant
D. Entropy becomes zero

Solution

Increasing temperature generally increases the kinetic energy of particles, leading to greater disorder and thus an increase in entropy.

Correct Answer: B — Entropy increases

Q. What is the effect of increasing temperature on the entropy of a system?

A. Increases entropy
B. Decreases entropy
C. No effect
D. Depends on the system

Solution

Increasing temperature generally increases the entropy of a system as the molecular motion becomes more chaotic.

Correct Answer: A — Increases entropy

Q. What is the effect of increasing temperature on the equilibrium constant Kc for an endothermic reaction?

A. Kc increases
B. Kc decreases
C. Kc remains constant
D. Kc becomes zero

Solution

For endothermic reactions, increasing temperature shifts the equilibrium to the right, increasing Kc.

Correct Answer: A — Kc increases

Q. What is the effect of increasing temperature on the equilibrium constant of an exothermic reaction?

A. Increases
B. Decreases
C. Remains the same
D. Becomes zero

Solution

According to Le Chatelier's principle, increasing the temperature of an exothermic reaction shifts the equilibrium to the left, decreasing the equilibrium constant.

Correct Answer: B — Decreases

Q. What is the effect of increasing temperature on the equilibrium constant of an endothermic reaction?

A. Increases
B. Decreases
C. No effect
D. Depends on the reaction

Solution

For an endothermic reaction, increasing the temperature increases the equilibrium constant.

Correct Answer: A — Increases

Q. What is the effect of increasing temperature on the kinetic energy of gas molecules?

A. Increases kinetic energy
B. Decreases kinetic energy
C. No effect
D. Depends on the gas

Solution

Increasing temperature increases the kinetic energy of gas molecules.

Correct Answer: A — Increases kinetic energy

Q. What is the effect of increasing temperature on the kinetic energy of gas particles?

A. It decreases kinetic energy.
B. It has no effect.
C. It increases kinetic energy.
D. It causes phase change.

Solution

Increasing temperature increases the kinetic energy of gas particles.

Correct Answer: C — It increases kinetic energy.

Q. What is the effect of increasing temperature on the kinetic energy of particles in a substance?

A. Kinetic energy decreases
B. Kinetic energy remains constant
C. Kinetic energy increases
D. Kinetic energy fluctuates

Solution

Increasing temperature increases the kinetic energy of particles in a substance.

Correct Answer: C — Kinetic energy increases

Q. What is the effect of increasing temperature on the pressure of a gas at constant volume?

A. Pressure decreases
B. Pressure remains constant
C. Pressure increases
D. Pressure fluctuates

Solution

According to Gay-Lussac's law, pressure increases with temperature at constant volume.

Correct Answer: C — Pressure increases

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