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 temperature on the resistance in a Wheatstone bridge?
A.
Resistance increases with temperature
B.
Resistance decreases with temperature
C.
Resistance remains constant
D.
Depends on the material
Show solution
Solution
The effect of temperature on resistance depends on the material; for most conductors, resistance increases with temperature.
Correct Answer:
D
— Depends on the material
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Q. What is the effect of temperature on the resistance of a conductor?
A.
Resistance increases with temperature
B.
Resistance decreases with temperature
C.
Resistance remains constant
D.
Resistance is independent of temperature
Show solution
Solution
For most conductors, resistance increases with temperature due to increased lattice vibrations that impede electron flow.
Correct Answer:
A
— Resistance increases with temperature
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Q. What is the effect of temperature on the resistance of the potentiometer wire?
A.
Resistance decreases with temperature
B.
Resistance increases with temperature
C.
Resistance remains constant
D.
Resistance fluctuates randomly
Show solution
Solution
The resistance of most conductive materials increases with temperature due to increased atomic vibrations that impede electron flow.
Correct Answer:
B
— Resistance increases with temperature
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Q. What is the effect of temperature on the speed of sound in air?
A.
Increases with temperature
B.
Decreases with temperature
C.
No effect
D.
Increases then decreases
Show solution
Solution
The speed of sound in air increases with an increase in temperature.
Correct Answer:
A
— Increases with temperature
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Q. What is the effect of temperature on the surface tension of a liquid?
A.
Surface tension increases with temperature
B.
Surface tension decreases with temperature
C.
Surface tension remains constant with temperature
D.
Surface tension is independent of the nature of the liquid
Show solution
Solution
As temperature increases, the kinetic energy of the molecules increases, leading to a decrease in cohesive forces and thus a decrease in surface tension.
Correct Answer:
B
— Surface tension decreases with temperature
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Q. What is the effect of temperature on the surface tension of water?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies unpredictably
Show solution
Solution
Surface tension decreases with an increase in temperature due to increased molecular motion.
Correct Answer:
B
— Decreases with temperature
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Q. What is the effect of temperature on the vapor pressure of a solvent according to Raoult's Law?
A.
Vapor pressure decreases with temperature
B.
Vapor pressure increases with temperature
C.
Vapor pressure remains constant with temperature
D.
Vapor pressure is independent of the solvent
Show solution
Solution
According to Raoult's Law, the vapor pressure of a solvent increases with an increase in temperature.
Correct Answer:
B
— Vapor pressure increases with temperature
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Q. What is the effect of temperature on the viscosity of liquids?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies randomly
Show solution
Solution
For most liquids, viscosity decreases with an increase in temperature due to increased molecular motion.
Correct Answer:
B
— Decreases with temperature
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Q. What is the effect of the +M effect on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
Show solution
Solution
The +M effect stabilizes the carbocation by donating electron density through resonance.
Correct Answer:
B
— Stabilizes the carbocation
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Q. What is the effect of the -I effect on acidity?
A.
Increases acidity
B.
Decreases acidity
C.
No effect on acidity
D.
Depends on the solvent
Show solution
Solution
The -I effect increases acidity by stabilizing the negative charge on the conjugate base.
Correct Answer:
A
— Increases acidity
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Q. What is the effect of the -I group on acidity?
A.
Increases acidity
B.
Decreases acidity
C.
No effect on acidity
D.
Depends on the solvent
Show solution
Solution
Electron-withdrawing groups (-I) increase the acidity of compounds by stabilizing the negative charge on the conjugate base.
Correct Answer:
A
— Increases acidity
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Q. What is the effect of the -M (mesomeric) effect on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
Show solution
Solution
The -M effect can stabilize a carbocation by delocalizing the positive charge.
Correct Answer:
B
— Stabilizes the carbocation
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Q. What is the effect of the -M group on the stability of a carbocation?
A.
Destabilizes the carbocation
B.
Stabilizes the carbocation
C.
No effect on stability
D.
Increases acidity
Show solution
Solution
-M groups destabilize carbocations by withdrawing electron density through resonance.
Correct Answer:
A
— Destabilizes the carbocation
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Q. What is the effect on the angular momentum of a system if an external torque is applied?
A.
It increases
B.
It decreases
C.
It changes
D.
It remains constant
Show solution
Solution
An external torque changes the angular momentum of the system.
Correct Answer:
C
— It changes
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Q. What is the effect on the total current in a circuit if an additional resistor is added in parallel to an existing resistor?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Adding a resistor in parallel decreases the total resistance, which increases the total current according to Ohm's law.
Correct Answer:
A
— Increases
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Q. What is the effect on the total resistance in a circuit when more resistors are added in series?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Adding more resistors in series increases the total resistance, as total resistance is the sum of individual resistances.
Correct Answer:
A
— Increases
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Q. What is the effect on the total resistance when a resistor is added in parallel to an existing resistor?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Doubles
Show solution
Solution
Adding a resistor in parallel decreases the total resistance of the circuit.
Correct Answer:
B
— Decreases
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Q. What is the effect on the total resistance when more resistors are added in parallel?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the resistors
Show solution
Solution
Adding resistors in parallel decreases the total resistance.
Correct Answer:
B
— Decreases
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Q. What is the effect on the total resistance when more resistors are added in parallel to a circuit?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Doubles
Show solution
Solution
Adding more resistors in parallel decreases the total resistance of the circuit.
Correct Answer:
B
— Decreases
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Q. What is the effect on the total resistance when more resistors are added in series?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the resistors
Show solution
Solution
Total resistance increases when resistors are added in series.
Correct Answer:
A
— Increases
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Q. What is the effect on the total resistance when more resistors are added in series to a circuit?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
In series, the total resistance increases as more resistors are added.
Correct Answer:
B
— It increases
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Q. What is the efficiency of a Carnot engine operating between temperatures T1 and T2?
A.
(T1 - T2) / T1
B.
T2 / T1
C.
(T1 - T2) / T2
D.
1 - (T2 / T1)
Show solution
Solution
The efficiency of a Carnot engine is given by the formula: efficiency = 1 - (T2 / T1), where T1 is the higher temperature and T2 is the lower temperature.
Correct Answer:
D
— 1 - (T2 / T1)
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Q. What is the electric field at a distance d from an infinitely long charged wire with linear charge density λ?
A.
λ/(2πε₀d)
B.
λ/(4πε₀d²)
C.
λ/(2πε₀d²)
D.
0
Show solution
Solution
The electric field due to an infinitely long charged wire is given by E = λ/(2πε₀d).
Correct Answer:
A
— λ/(2πε₀d)
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Q. What is the electric field at a distance of 1m from a charge of +1μC?
A.
9 × 10^9 N/C
B.
9 × 10^6 N/C
C.
9 × 10^3 N/C
D.
9 × 10^12 N/C
Show solution
Solution
Electric field E = k * q / r^2 = (9 × 10^9) * (1 × 10^-6) / (1)^2 = 9 × 10^3 N/C.
Correct Answer:
B
— 9 × 10^6 N/C
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Q. What is the electric field at a distance r from a uniformly charged disk of radius R and surface charge density σ?
A.
σ/(2ε₀)
B.
σ/(4ε₀)
C.
σ/(2ε₀) * (1 - r/√(R² + r²))
D.
Zero
Show solution
Solution
The electric field at a distance r from a uniformly charged disk is given by E = σ/(2ε₀) * (1 - r/√(R² + r²)).
Correct Answer:
C
— σ/(2ε₀) * (1 - r/√(R² + r²))
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Q. What is the electric field at a distance r from a uniformly charged sphere of radius R and total charge Q, when r > R?
A.
Q/(4πε₀r²)
B.
Q/(4πε₀R²)
C.
Zero
D.
Q/(4πε₀R)
Show solution
Solution
For r > R, the electric field behaves as if all the charge were concentrated at the center, thus E = Q/(4πε₀r²).
Correct Answer:
A
— Q/(4πε₀r²)
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Q. What is the electric field at a distance r from an infinitely long line charge with linear charge density λ?
A.
λ/2πε₀r
B.
λ/4πε₀r²
C.
λ/ε₀r
D.
λ/2ε₀r²
Show solution
Solution
The electric field due to an infinite line charge is given by E = λ/2πε₀r.
Correct Answer:
A
— λ/2πε₀r
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Q. What is the electric field at a distance r from an infinitely long line of charge with linear charge density λ?
A.
λ/(2πε₀r)
B.
λ/(4πε₀r²)
C.
λ/(2πε₀r²)
D.
0
Show solution
Solution
The electric field due to an infinitely long line of charge is given by E = λ/(2πε₀r), directed radially outward from the line.
Correct Answer:
A
— λ/(2πε₀r)
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Q. What is the electric field at a point due to a positive charge?
A.
Directed towards the charge
B.
Directed away from the charge
C.
Zero
D.
Depends on the distance from the charge
Show solution
Solution
The electric field due to a positive charge is directed away from the charge.
Correct Answer:
B
— Directed away from the charge
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Q. What is the electric field at a point just outside a charged conductor?
A.
0
B.
σ/ε₀
C.
σ/2ε₀
D.
σ/4ε₀
Show solution
Solution
The electric field just outside a charged conductor is given by E = σ/ε₀, where σ is the surface charge density.
Correct Answer:
B
— σ/ε₀
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