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. For a charged spherical conductor, what happens to the electric field inside the conductor when it is charged?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes zero
Q. For a circular loop of radius R carrying a current I, what is the magnetic field at the center of the loop?
  • A. B = μ₀I/(2R)
  • B. B = μ₀I/(4R)
  • C. B = μ₀I/(πR)
  • D. B = μ₀I/(2πR)
Q. For a closed loop of wire carrying current, what does the line integral of the magnetic field equal?
  • A. Zero
  • B. The product of current and resistance
  • C. μ₀ times the total current enclosed
  • D. The electric field times the area
Q. For a closed surface enclosing multiple charges, how is the total electric flux related to the enclosed charges?
  • A. It is proportional to the sum of the charges
  • B. It is inversely proportional to the sum of the charges
  • C. It is independent of the charges
  • D. It is proportional to the square of the charges
Q. For a closed surface enclosing multiple charges, how is the total electric flux calculated?
  • A. Sum of individual fluxes
  • B. Product of charges
  • C. Sum of enclosed charges divided by ε₀
  • D. Average of charges
Q. For a composite body made of a solid cylinder and a solid sphere, how do you calculate the total moment of inertia about the same axis?
  • A. Add the individual moments
  • B. Multiply the individual moments
  • C. Subtract the individual moments
  • D. Divide the individual moments
Q. For a composite body made of two solid cylinders of mass M1 and M2 and radius R, what is the total moment of inertia about the same axis?
  • A. I1 + I2
  • B. I1 - I2
  • C. I1 * I2
  • D. I1 / I2
Q. For a current-carrying loop, what is the magnetic field at the center if the radius is halved?
  • A. It remains the same
  • B. It doubles
  • C. It quadruples
  • D. It halves
Q. For a cylindrical conductor of radius R carrying current I, what is the magnetic field at a point outside the cylinder?
  • A. 0
  • B. μ₀I/2πr
  • C. μ₀I/4πr
  • D. μ₀I/πr
Q. For a cylindrical conductor of radius R carrying current I, what is the magnetic field at a point outside the conductor?
  • A. 0
  • B. μ₀I/2πR
  • C. μ₀I/4πR
  • D. μ₀I/πR
Q. For a damped oscillator, what is the relationship between the natural frequency and the damped frequency?
  • A. Damped frequency is greater
  • B. Damped frequency is equal
  • C. Damped frequency is less
  • D. No relationship
Q. For a diffraction grating with 500 lines per mm, what is the angle of the first order maximum for light of wavelength 600 nm?
  • A. 30 degrees
  • B. 45 degrees
  • C. 60 degrees
  • D. 15 degrees
Q. For a diffraction pattern produced by a single slit, how does the width of the central maximum change if the slit width is halved?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. For a diffraction pattern produced by a single slit, how does the width of the central maximum compare to the other maxima?
  • A. Wider than all other maxima
  • B. Narrower than all other maxima
  • C. Equal to all other maxima
  • D. None of the above
Q. For a first-order reaction, if the half-life is 10 minutes, what will be the half-life if the initial concentration is doubled?
  • A. 10 minutes
  • B. 5 minutes
  • C. 20 minutes
  • D. 15 minutes
Q. For a first-order reaction, the half-life is independent of the initial concentration. What is the expression for half-life?
  • A. t1/2 = 0.693/k
  • B. t1/2 = k/0.693
  • C. t1/2 = 1/k
  • D. t1/2 = k/2
Q. For a first-order reaction, the half-life is independent of which of the following?
  • A. Initial concentration
  • B. Rate constant
  • C. Temperature
  • D. All of the above
Q. For a gas at 300 K, if the RMS speed is 500 m/s, what will be the RMS speed at 600 K?
  • A. 500 m/s
  • B. 707 m/s
  • C. 1000 m/s
  • D. 250 m/s
Q. For a gas at 300 K, what is the RMS speed if the molar mass is 0.028 kg/mol?
  • A. 500 m/s
  • B. 600 m/s
  • C. 700 m/s
  • D. 800 m/s
Q. For a gas at a certain temperature, if the molar mass is halved, what happens to the RMS speed?
  • A. Increases by a factor of 2
  • B. Increases by a factor of sqrt(2)
  • C. Decreases by a factor of 2
  • D. Remains the same
Q. For a gas at a constant temperature, if the molar mass is halved, what happens to the RMS speed?
  • A. Increases by a factor of sqrt(2)
  • B. Increases by a factor of 2
  • C. Decreases by a factor of 2
  • D. Remains the same
Q. For a gas at constant pressure, if the volume is doubled, what happens to the temperature?
  • A. It remains the same
  • B. It doubles
  • C. It halves
  • D. It triples
Q. For a gas at constant pressure, if the volume is halved, what happens to the temperature?
  • A. It remains the same
  • B. It doubles
  • C. It is halved
  • D. It is quartered
Q. For a gas mixture, how is the RMS speed calculated?
  • A. Using the average molar mass of the mixture
  • B. Using the molar mass of the heaviest gas
  • C. Using the molar mass of the lightest gas
  • D. Using the molar mass of the most abundant gas
Q. For a gas with a molar mass of 32 g/mol at 273 K, what is the RMS speed?
  • A. 300 m/s
  • B. 400 m/s
  • C. 500 m/s
  • D. 600 m/s
Q. For a gas with a molar mass of 32 g/mol at a temperature of 300 K, what is the RMS speed?
  • A. 273 m/s
  • B. 400 m/s
  • C. 500 m/s
  • D. 600 m/s
Q. For a gas with molar mass M at temperature T, what is the relationship between RMS speed and molar mass?
  • A. v_rms is directly proportional to M
  • B. v_rms is inversely proportional to M
  • C. v_rms is independent of M
  • D. v_rms is proportional to M^2
Q. For a gas with molar mass M, what is the relationship between RMS speed and molar mass?
  • A. v_rms is directly proportional to M
  • B. v_rms is inversely proportional to M
  • C. v_rms is independent of M
  • D. v_rms is proportional to M^2
Q. For a gas with molar mass M, what is the relationship between RMS speed and molecular mass?
  • A. v_rms is directly proportional to M
  • B. v_rms is inversely proportional to M
  • C. v_rms is independent of M
  • D. v_rms is proportional to M^2
Q. For a gas with molar mass M, what is the RMS speed at 300 K?
  • A. sqrt(3RT/M)
  • B. sqrt(2RT/M)
  • C. RT/M
  • D. 3RT/M
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