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 triangle PQR, if PQ = 10 cm, QR = 24 cm, and PR = 26 cm, what is the area of the triangle?
A.
120 cm²
B.
120√3 cm²
C.
240 cm²
D.
48 cm²
Show solution
Solution
Using Heron's formula, s = (10 + 24 + 26)/2 = 30. Area = √(30(30-10)(30-24)(30-26)) = √(30*20*6*4) = 120 cm².
Correct Answer:
A
— 120 cm²
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Q. In triangle XYZ, if XY = 8 cm, YZ = 15 cm, and XZ = 17 cm, is it a right triangle?
A.
Yes
B.
No
C.
Cannot be determined
D.
Only if XY is the hypotenuse
Show solution
Solution
Since 8^2 + 15^2 = 17^2, triangle XYZ is a right triangle.
Correct Answer:
A
— Yes
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Q. In uniform circular motion, which of the following quantities remains constant?
A.
Speed
B.
Velocity
C.
Acceleration
D.
Centripetal force
Show solution
Solution
In uniform circular motion, the speed remains constant, but velocity and acceleration change direction.
Correct Answer:
A
— Speed
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Q. In uniform circular motion, which of the following statements is true?
A.
Velocity is constant
B.
Acceleration is zero
C.
Speed is constant
D.
Net force is zero
Show solution
Solution
In uniform circular motion, speed is constant but velocity changes due to direction change.
Correct Answer:
C
— Speed is constant
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Q. In which condition does a real gas behave most like an ideal gas?
A.
High pressure and low temperature
B.
Low pressure and high temperature
C.
High pressure and high temperature
D.
Low pressure and low temperature
Show solution
Solution
A real gas behaves most like an ideal gas under low pressure and high temperature conditions.
Correct Answer:
B
— Low pressure and high temperature
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Q. In which condition does the ideal gas law fail?
A.
High temperature and low pressure
B.
Low temperature and high pressure
C.
High volume
D.
Low volume
Show solution
Solution
The ideal gas law fails under low temperature and high pressure conditions, where gas particles are close together and intermolecular forces become significant.
Correct Answer:
B
— Low temperature and high pressure
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Q. In which direction does the magnetic field point due to a current flowing in a straight wire?
A.
Parallel to the wire
B.
Perpendicular to the wire
C.
Radially inward
D.
Radially outward
Show solution
Solution
The magnetic field lines around a straight wire are concentric circles, which are perpendicular to the wire.
Correct Answer:
B
— Perpendicular to the wire
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Q. In which direction does the magnetic field point in relation to the current in a straight conductor?
A.
Parallel to the current
B.
Perpendicular to the current
C.
Opposite to the current
D.
In the same direction as the current
Show solution
Solution
The magnetic field around a straight conductor is always perpendicular to the direction of the current.
Correct Answer:
B
— Perpendicular to the current
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Q. In which direction does the magnetic field point inside a bar magnet?
A.
From south to north
B.
From north to south
C.
In a circular path
D.
It has no direction
Show solution
Solution
The magnetic field inside a bar magnet points from the north pole to the south pole.
Correct Answer:
B
— From north to south
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Q. In which direction does the magnetic field point inside a current-carrying loop?
A.
Out of the plane
B.
Into the plane
C.
Clockwise
D.
Counterclockwise
Show solution
Solution
Using the right-hand rule, the magnetic field inside a current-carrying loop points into the plane of the loop.
Correct Answer:
B
— Into the plane
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Q. In which medium does sound travel fastest?
A.
Air
B.
Water
C.
Steel
D.
Vacuum
Show solution
Solution
Sound travels fastest in solids like steel due to closely packed molecules.
Correct Answer:
C
— Steel
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Q. In which mode of heat transfer does the temperature difference drive the flow of heat?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
Show solution
Solution
Convection is the mode of heat transfer where the temperature difference causes the fluid to move, transferring heat.
Correct Answer:
B
— Convection
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Q. In which mode of heat transfer does the transfer of energy occur through electromagnetic waves?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
Show solution
Solution
Radiation is the mode of heat transfer that occurs through electromagnetic waves, such as infrared radiation.
Correct Answer:
C
— Radiation
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Q. In which of the following cases does a material exhibit plastic deformation?
A.
When the stress is below the yield point
B.
When the stress exceeds the yield point
C.
When the material is unloaded
D.
When the material is cooled
Show solution
Solution
Plastic deformation occurs when the stress exceeds the yield point.
Correct Answer:
B
— When the stress exceeds the yield point
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Q. In which of the following cases does the mesomeric effect dominate over the inductive effect?
A.
Aromatic compounds
B.
Aliphatic compounds
C.
Alkynes
D.
Alkenes
Show solution
Solution
In aromatic compounds, the mesomeric effect dominates due to resonance stabilization.
Correct Answer:
A
— Aromatic compounds
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Q. In which of the following cases is the magnetic field zero?
A.
At the center of a current-carrying loop
B.
Inside a solenoid with no current
C.
Near a straight wire carrying current
D.
At the midpoint between two parallel wires carrying equal currents in opposite directions
Show solution
Solution
The magnetic field is zero at the midpoint between two parallel wires carrying equal currents in opposite directions.
Correct Answer:
D
— At the midpoint between two parallel wires carrying equal currents in opposite directions
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Q. In which of the following compounds does the central atom exhibit dsp3 hybridization?
A.
PCl5
B.
SF6
C.
XeF4
D.
NH3
Show solution
Solution
In PCl5, phosphorus exhibits dsp3 hybridization, forming five P-Cl bonds.
Correct Answer:
A
— PCl5
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Q. In which of the following compounds does the central atom exhibit sp hybridization?
A.
C2H4
B.
N2
C.
HCl
D.
C2H2
Show solution
Solution
In C2H2, the carbon atoms are sp hybridized, forming a triple bond between them.
Correct Answer:
D
— C2H2
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Q. In which of the following compounds does the central atom have an incomplete octet?
A.
BF3
B.
CH4
C.
H2O
D.
NH3
Show solution
Solution
Boron trifluoride (BF3) has an incomplete octet as boron only has six electrons in its valence shell.
Correct Answer:
A
— BF3
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Q. In which of the following compounds does the central atom have sp3d hybridization?
A.
PCl5
B.
SiCl4
C.
XeF4
D.
NH4Cl
Show solution
Solution
In PCl5, the phosphorus atom is sp3d hybridized, allowing it to form five P-Cl bonds.
Correct Answer:
A
— PCl5
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Q. In which of the following compounds does the inductive effect play a significant role?
A.
Benzene
B.
Acetic acid
C.
Cyclohexane
D.
Ethylene
Show solution
Solution
In acetic acid, the inductive effect of the –COOH group influences the acidity of the compound.
Correct Answer:
B
— Acetic acid
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Q. In which of the following compounds is the bond order equal to 1?
Show solution
Solution
H2 has a bond order of 1, indicating a single bond between the two hydrogen atoms.
Correct Answer:
C
— H2
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Q. In which of the following conditions does a gas deviate most from ideal behavior?
A.
High temperature and low pressure
B.
Low temperature and high pressure
C.
High temperature and high pressure
D.
Low temperature and low pressure
Show solution
Solution
A gas deviates most from ideal behavior at low temperatures and high pressures due to increased intermolecular forces.
Correct Answer:
B
— Low temperature and high pressure
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Q. In which of the following materials does heat transfer occur primarily through conduction?
A.
Metal
B.
Water
C.
Air
D.
Vacuum
Show solution
Solution
Heat transfer through conduction occurs primarily in solids, especially metals.
Correct Answer:
A
— Metal
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Q. In which of the following molecules does the molecular orbital configuration lead to paramagnetism?
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Solution
O2 is paramagnetic due to the presence of two unpaired electrons in its molecular orbitals.
Correct Answer:
B
— O2
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Q. In which of the following molecules does the molecular orbital configuration show unpaired electrons?
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Solution
O2 has two unpaired electrons in its π* orbitals, making it paramagnetic.
Correct Answer:
B
— O2
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Q. In which of the following molecules does the molecular orbital diagram show a paramagnetic behavior?
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Solution
O2 is paramagnetic due to the presence of two unpaired electrons in its molecular orbitals.
Correct Answer:
B
— O2
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Q. In which of the following molecules does the molecular orbital theory predict a triple bond?
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Solution
N2 has a triple bond, with a bond order of 3 according to molecular orbital theory.
Correct Answer:
A
— N2
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Q. In which of the following molecules does the molecular orbital theory predict a paramagnetic behavior?
Show solution
Solution
O2 is paramagnetic due to the presence of two unpaired electrons in its molecular orbitals.
Correct Answer:
B
— O2
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Q. In which of the following orbitals would an electron have the highest energy?
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Solution
The 3s orbital has the highest principal quantum number (n=3), indicating it has the highest energy.
Correct Answer:
D
— 3s
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