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 an AC circuit, if the frequency is doubled, what happens to the inductive reactance?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. In an AC circuit, if the frequency is doubled, what happens to the reactance of an inductor?
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Quadruples
Q. In an AC circuit, if the power factor is 0.5, what is the angle between voltage and current?
  • A. 30 degrees
  • B. 60 degrees
  • C. 90 degrees
  • D. 45 degrees
Q. In an AC circuit, if the power factor is 1, what type of load is present?
  • A. Inductive
  • B. Capacitive
  • C. Resistive
  • D. Reactive
Q. In an AC circuit, if the voltage is given by V(t) = V_0 sin(ωt), what is the expression for the current through a resistor R?
  • A. I(t) = (V_0/R) sin(ωt)
  • B. I(t) = (V_0/R) cos(ωt)
  • C. I(t) = (R/V_0) sin(ωt)
  • D. I(t) = (R/V_0) cos(ωt)
Q. In an arithmetic series, if the first term is 5 and the last term is 45, and there are 10 terms, what is the common difference?
  • A. 4
  • B. 5
  • C. 3
  • D. 2
Q. In an electric circuit, if the voltage is 12 V and the current is 3 A, what is the power?
  • A. 36 W
  • B. 9 W
  • C. 4 W
  • D. 12 W
Q. In an electric circuit, if the voltage is doubled while the resistance remains constant, what happens to the power?
  • A. It remains the same
  • B. It doubles
  • C. It quadruples
  • D. It halves
Q. In an endothermic reaction, the enthalpy of the products is ____ than that of the reactants.
  • A. higher
  • B. lower
  • C. equal
  • D. unpredictable
Q. In an experiment, a student measures the mass of an object as 200 g with an uncertainty of ±5 g. What is the range of possible values for the mass?
  • A. 195 g to 205 g
  • B. 200 g to 210 g
  • C. 195 g to 210 g
  • D. 200 g to 205 g
Q. In an experiment, the length of a rod is measured as 12.0 m with an uncertainty of ±0.5 m. What is the total uncertainty if the length is used in a calculation involving multiplication by 3?
  • A. ±1.5 m
  • B. ±0.5 m
  • C. ±0.75 m
  • D. ±0.25 m
Q. In an experiment, the mass of an object is measured as 5.0 kg with an uncertainty of ±0.2 kg. What is the absolute error?
  • A. 0.2 kg
  • B. 0.5 kg
  • C. 0.1 kg
  • D. 0.3 kg
Q. In an experiment, the measured value of a voltage is 12.0 V with an uncertainty of ±0.2 V. What is the maximum possible error?
  • A. 0.2 V
  • B. 0.1 V
  • C. 0.5 V
  • D. 0.0 V
Q. In an experiment, the voltage is measured as 12.0 V with an uncertainty of ±0.3 V. What is the absolute error in the voltage measurement?
  • A. 0.3 V
  • B. 0.25 V
  • C. 0.5 V
  • D. 0.1 V
Q. In an experiment, the voltage is measured as 12.0 V with an uncertainty of ±0.5 V. What is the absolute error in the voltage measurement?
  • A. 0.5 V
  • B. 0.05 V
  • C. 5 V
  • D. 1 V
Q. In an experiment, the voltage is measured as 12.0 V with an uncertainty of ±0.5 V. What is the maximum possible error in the voltage measurement?
  • A. 0.5 V
  • B. 0.25 V
  • C. 1 V
  • D. 0.1 V
Q. In an ideal gas, the average kinetic energy of a molecule is directly proportional to:
  • A. Pressure
  • B. Volume
  • C. Temperature
  • D. Density
Q. In an ideal gas, the average kinetic energy of a molecule is directly proportional to which of the following?
  • A. Pressure
  • B. Volume
  • C. Temperature
  • D. Number of molecules
Q. In an ideal gas, the mean free path is defined as the average distance a molecule travels between collisions. Which factor does NOT affect the mean free path?
  • A. Temperature of the gas.
  • B. Density of the gas.
  • C. Size of the gas molecules.
  • D. Color of the gas molecules.
Q. In an ideal gas, the pressure is directly proportional to which of the following?
  • A. Volume
  • B. Temperature
  • C. Number of moles
  • D. Density
Q. In an ideal gas, the root mean square speed of the gas molecules is given by which of the following formulas?
  • A. v_rms = √(3RT/M)
  • B. v_rms = √(RT/M)
  • C. v_rms = √(2RT/M)
  • D. v_rms = √(R/M)
Q. In an ideal gas, the volume occupied by the gas molecules is:
  • A. Negligible compared to the total volume
  • B. Equal to the total volume
  • C. Greater than the total volume
  • D. None of the above
Q. In an ideal gas, which of the following quantities is constant during an isothermal process?
  • A. Pressure.
  • B. Volume.
  • C. Temperature.
  • D. Number of moles.
Q. In an ideal solution, the enthalpy of mixing is:
  • A. Positive
  • B. Negative
  • C. Zero
  • D. Varies with concentration
Q. In an irreversible process, the change in entropy of the universe is:
  • A. Zero
  • B. Positive
  • C. Negative
  • D. Undefined
Q. In an isochoric process, the volume of the system:
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Varies with temperature
Q. In an isochoric process, what happens to the internal energy of a gas when heat is added?
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It depends on the gas
Q. In an isochoric process, what happens to the internal energy of an ideal gas when heat is added?
  • A. It decreases.
  • B. It remains constant.
  • C. It increases.
  • D. It depends on the amount of heat added.
Q. In an isothermal process for an ideal gas, which of the following is true?
  • A. The internal energy remains constant.
  • B. The temperature increases.
  • C. The pressure decreases.
  • D. The volume remains constant.
Q. In an isothermal process, how does the internal energy of an ideal gas change?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Depends on the amount of gas
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