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 phase difference between two waves that interfere constructively?
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Solution
Constructive interference occurs when the phase difference is an integer multiple of 2π, which corresponds to a phase difference of 0.
Correct Answer:
A
— 0
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Q. What is the phase difference between two waves that interfere destructively?
A.
0 radians
B.
π/2 radians
C.
π radians
D.
3π/2 radians
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Solution
Destructive interference occurs when the phase difference is π radians (or an odd multiple of π).
Correct Answer:
C
— π radians
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Q. What is the phenomenon called when a changing magnetic field induces an electric current in a conductor?
A.
Electromagnetic induction
B.
Electrolysis
C.
Magnetic resonance
D.
Thermal conduction
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Solution
The phenomenon of inducing an electric current in a conductor due to a changing magnetic field is known as electromagnetic induction.
Correct Answer:
A
— Electromagnetic induction
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Q. What is the phenomenon called when a changing magnetic field induces an electromotive force (EMF) in a circuit?
A.
Electromagnetic induction
B.
Magnetic resonance
C.
Electrolysis
D.
Magnetization
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Solution
The phenomenon is known as electromagnetic induction, as described by Faraday's law.
Correct Answer:
A
— Electromagnetic induction
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Q. What is the phenomenon called when a changing magnetic field induces an electromotive force (EMF) in a conductor?
A.
Electromagnetic induction
B.
Magnetic resonance
C.
Electrolysis
D.
Magnetization
Show solution
Solution
The phenomenon of inducing an EMF in a conductor due to a changing magnetic field is known as electromagnetic induction.
Correct Answer:
A
— Electromagnetic induction
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Q. What is the phenomenon called when a conductor moves through a magnetic field and generates an electric current?
A.
Electromagnetic induction
B.
Magnetic hysteresis
C.
Electrostatic induction
D.
Magnetic flux
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Solution
This phenomenon is known as electromagnetic induction, where a changing magnetic field induces an electric current in a conductor.
Correct Answer:
A
— Electromagnetic induction
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Q. What is the phenomenon called when a liquid changes to gas at a temperature below its boiling point?
A.
Evaporation
B.
Condensation
C.
Sublimation
D.
Freezing
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Solution
Evaporation is the process where a liquid changes to gas at temperatures below its boiling point.
Correct Answer:
A
— Evaporation
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Q. What is the phenomenon called when a liquid changes to gas at temperatures below its boiling point?
A.
Evaporation
B.
Condensation
C.
Sublimation
D.
Vaporization
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Solution
Evaporation is the process where a liquid changes to gas at temperatures below its boiling point.
Correct Answer:
A
— Evaporation
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Q. What is the phenomenon called when a liquid rises in a narrow tube against gravity?
A.
Capillarity
B.
Viscosity
C.
Surface tension
D.
Hydrostatic pressure
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Solution
Capillarity is the phenomenon where a liquid rises in a narrow tube against gravity due to adhesive and cohesive forces.
Correct Answer:
A
— Capillarity
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Q. What is the phenomenon called when an electron transitions from a higher energy level to a lower energy level in an atom?
A.
Ionization
B.
Excitation
C.
Emission
D.
Absorption
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Solution
When an electron transitions from a higher energy level to a lower energy level, it releases energy in the form of a photon, a process known as emission.
Correct Answer:
C
— Emission
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Q. What is the phenomenon called when electrons are emitted from a metal surface when it is exposed to light?
A.
Photoelectric effect
B.
Compton effect
C.
Rayleigh scattering
D.
Black body radiation
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Solution
The emission of electrons from a metal surface when exposed to light is known as the photoelectric effect.
Correct Answer:
A
— Photoelectric effect
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Q. What is the phenomenon called when light waves are restricted to vibrate in a single plane?
A.
Refraction
B.
Diffraction
C.
Polarization
D.
Interference
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Solution
The phenomenon of light waves being restricted to vibrate in a single plane is called polarization.
Correct Answer:
C
— Polarization
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Q. What is the phenomenon called when light waves bend around the edges of an obstacle?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Interference
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Solution
The bending of light waves around the edges of an obstacle is known as diffraction.
Correct Answer:
C
— Diffraction
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Q. What is the phenomenon called when sound waves bend around obstacles?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Interference
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Solution
The bending of sound waves around obstacles is known as diffraction.
Correct Answer:
C
— Diffraction
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Q. What is the phenomenon of diffraction primarily associated with?
A.
Reflection of light
B.
Bending of waves around obstacles
C.
Interference of waves
D.
Polarization of light
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Solution
Diffraction is the bending of waves around obstacles and the spreading of waves when they pass through small openings.
Correct Answer:
B
— Bending of waves around obstacles
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Q. What is the phenomenon of diffraction primarily responsible for?
A.
Bending of light around obstacles
B.
Reflection of light
C.
Refraction of light
D.
Polarization of light
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Solution
Diffraction is the bending of waves around obstacles and the spreading of waves when they pass through small openings.
Correct Answer:
A
— Bending of light around obstacles
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Q. What is the phenomenon of electromagnetic induction?
A.
The generation of electric current by a changing magnetic field
B.
The generation of magnetic field by a changing electric current
C.
The interaction between electric and magnetic fields
D.
The conversion of mechanical energy into electrical energy
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Solution
Electromagnetic induction refers to the generation of electric current in a conductor due to a changing magnetic field.
Correct Answer:
A
— The generation of electric current by a changing magnetic field
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Q. What is the phenomenon of polarization in light?
A.
The splitting of light into different colors
B.
The alignment of light waves in a particular direction
C.
The reflection of light off a surface
D.
The bending of light as it passes through a medium
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Solution
Polarization refers to the orientation of the oscillations of light waves in a particular direction.
Correct Answer:
B
— The alignment of light waves in a particular direction
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Q. What is the photoelectric effect primarily used for in technology?
A.
Solar panels
B.
LEDs
C.
Lasers
D.
Television screens
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Solution
The photoelectric effect is primarily used in solar panels to convert light energy into electrical energy.
Correct Answer:
A
— Solar panels
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Q. What is the photoelectric effect?
A.
Emission of electrons from a metal surface when light shines on it
B.
Absorption of light by a metal surface
C.
Reflection of light from a metal surface
D.
Transmission of light through a metal surface
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Solution
The photoelectric effect is the phenomenon where electrons are emitted from a metal surface when it is exposed to light of sufficient frequency.
Correct Answer:
A
— Emission of electrons from a metal surface when light shines on it
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Q. What is the pKa value of acetic acid?
A.
4.76
B.
7.00
C.
9.25
D.
2.00
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Solution
The pKa value of acetic acid is approximately 4.76.
Correct Answer:
A
— 4.76
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Q. What is the pKb value of a strong base?
A.
Less than 0
B.
Equal to 0
C.
Greater than 0
D.
Equal to 14
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Solution
A strong base has a pKb value less than 0, indicating high basicity.
Correct Answer:
A
— Less than 0
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Q. What is the pKb value of a weak base?
A.
Less than 7
B.
Equal to 7
C.
Greater than 7
D.
None of the above
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Solution
A weak base has a pKb value greater than 7.
Correct Answer:
C
— Greater than 7
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Q. What is the potential at a distance of 1 m from a dipole with a dipole moment of 2 × 10^-9 C·m?
A.
0 V
B.
1 V
C.
2 V
D.
4 V
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Solution
Potential due to a dipole V = (1/4πε₀) * (p * cosθ) / r². At 1 m, it is negligible.
Correct Answer:
A
— 0 V
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Q. What is the potential difference across a 10 ohm resistor carrying a current of 2A?
A.
5V
B.
10V
C.
15V
D.
20V
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Solution
Using Ohm's law, V = I * R = 2A * 10 ohms = 20V.
Correct Answer:
D
— 20V
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Q. What is the potential difference across a 10Ω resistor if a current of 2A flows through it?
A.
5V
B.
10V
C.
20V
D.
15V
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Solution
Using Ohm's Law, V = I * R = 2A * 10Ω = 20V.
Correct Answer:
C
— 20V
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Q. What is the potential difference across a 10Ω resistor if a current of 4A flows through it?
A.
20V
B.
40V
C.
10V
D.
30V
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Solution
Using Ohm's Law, V = I * R = 4A * 10Ω = 40V.
Correct Answer:
A
— 20V
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Q. What is the potential difference across a 5 Ω resistor carrying a current of 2 A?
A.
10 V
B.
5 V
C.
2 V
D.
0 V
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Solution
Using Ohm's law, V = I * R = 2 A * 5 Ω = 10 V.
Correct Answer:
A
— 10 V
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Q. What is the potential difference across the galvanometer in a balanced Wheatstone bridge?
A.
Zero
B.
Equal to the supply voltage
C.
Depends on the resistances
D.
Half of the supply voltage
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Solution
In a balanced Wheatstone bridge, the potential difference across the galvanometer is zero, indicating no current flows through it.
Correct Answer:
A
— Zero
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Q. What is the potential difference between two points A and B if the electric field is uniform and equal to 50 N/C, and the distance between A and B is 2m?
A.
100 V
B.
50 V
C.
25 V
D.
0 V
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Solution
Potential difference V = E * d = 50 N/C * 2 m = 100 V.
Correct Answer:
A
— 100 V
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