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 power dissipated in a 10Ω resistor carrying a current of 2A?
A.
20W
B.
30W
C.
40W
D.
50W
Show solution
Solution
Power P = I^2 * R = (2A)^2 * 10Ω = 4 * 10 = 40W.
Correct Answer:
A
— 20W
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Q. What is the power dissipated in a 4 ohm resistor carrying a current of 3 A?
A.
12 W
B.
9 W
C.
6 W
D.
3 W
Show solution
Solution
Using the power formula P = I^2 * R, we have P = (3 A)^2 * 4 ohms = 9 * 4 = 36 W.
Correct Answer:
A
— 12 W
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Q. What is the power dissipated in a resistor of 10 ohms carrying a current of 2 A?
A.
20 W
B.
10 W
C.
5 W
D.
40 W
Show solution
Solution
Using the power formula P = I^2 * R, we have P = (2 A)^2 * 10 ohms = 4 * 10 = 40 W.
Correct Answer:
A
— 20 W
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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 2A?
A.
5W
B.
10W
C.
20W
D.
40W
Show solution
Solution
Power is given by P = I^2 * R = (2A)^2 * 5Ω = 4A^2 * 5Ω = 20W.
Correct Answer:
B
— 10W
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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 3A?
Show solution
Solution
Power P = I^2 * R = (3A)^2 * 5Ω = 9A^2 * 5Ω = 45W.
Correct Answer:
A
— 15W
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Q. What is the power dissipated in a resistor of 8Ω when a current of 2A flows through it?
A.
4W
B.
8W
C.
16W
D.
32W
Show solution
Solution
Power P = I^2 * R = (2A)^2 * 8Ω = 4A^2 * 8Ω = 32W.
Correct Answer:
C
— 16W
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Q. What is the power factor in a circuit with a phase angle of 60 degrees?
A.
0.5
B.
0.866
C.
1
D.
0
Show solution
Solution
The power factor is cos(60°) = 0.5.
Correct Answer:
B
— 0.866
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Q. What is the power factor of a circuit with a phase angle of 60 degrees?
A.
0.5
B.
0.866
C.
1
D.
0.707
Show solution
Solution
The power factor (PF) is given by cos(θ). For a phase angle of 60 degrees, PF = cos(60°) = 0.5.
Correct Answer:
B
— 0.866
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Q. What is the power factor of an AC circuit with a phase angle of 60 degrees?
A.
0.5
B.
0.866
C.
1
D.
0.707
Show solution
Solution
The power factor (PF) is given by cos(θ). For a phase angle of 60 degrees, PF = cos(60°) = 0.5.
Correct Answer:
B
— 0.866
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Q. What is the power of a lens with a focal length of 50 cm?
A.
+2 D
B.
+1 D
C.
-2 D
D.
-1 D
Show solution
Solution
Power (P) is given by P = 1/f (in meters). Thus, f = 50 cm = 0.5 m, so P = 1/0.5 = +2 D.
Correct Answer:
A
— +2 D
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Q. What is the power set of A = {a, b}?
A.
{∅, {a}, {b}, {a, b}}
B.
{a, b}
C.
{∅, {a, b}}
D.
{a, b, {a, b}}
Show solution
Solution
The power set of a set is the set of all its subsets. For A = {a, b}, the power set is {∅, {a}, {b}, {a, b}}.
Correct Answer:
A
— {∅, {a}, {b}, {a, b}}
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Q. What is the power set of the empty set ∅?
A.
{∅}
B.
{∅, {∅}}
C.
∅
D.
{∅, ∅}
Show solution
Solution
The power set of the empty set contains only the empty set itself: {∅}.
Correct Answer:
A
— {∅}
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Q. What is the power set of the set F = {a}?
A.
{∅, {a}}
B.
{∅, a}
C.
{a}
D.
{∅}
Show solution
Solution
The power set of F = {a} is {∅, {a}}.
Correct Answer:
A
— {∅, {a}}
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Q. What is the power set of the set G = {1}?
A.
{∅, {1}}
B.
{1}
C.
{∅}
D.
{1, ∅}
Show solution
Solution
The power set of G = {1} is {∅, {1}}.
Correct Answer:
A
— {∅, {1}}
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Q. What is the power set of the set {1, 2}?
A.
{∅, {1}, {2}, {1, 2}}
B.
{∅, {1, 2}}
C.
{1, 2}
D.
{1, 2, ∅}
Show solution
Solution
The power set of a set with n elements has 2^n elements. For {1, 2}, the power set is {∅, {1}, {2}, {1, 2}}.
Correct Answer:
A
— {∅, {1}, {2}, {1, 2}}
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Q. What is the prefix for 10^-6 in the SI system?
A.
Milli
B.
Micro
C.
Nano
D.
Pico
Show solution
Solution
The prefix for 10^-6 is 'Micro'.
Correct Answer:
B
— Micro
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Q. What is the primary active ingredient in most antacids?
A.
Calcium carbonate
B.
Magnesium hydroxide
C.
Aluminum hydroxide
D.
All of the above
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Solution
Most antacids contain active ingredients like calcium carbonate, magnesium hydroxide, or aluminum hydroxide to neutralize stomach acid.
Correct Answer:
D
— All of the above
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Q. What is the primary advantage of using digital signals over analog signals in communication systems?
A.
Higher bandwidth
B.
Less susceptibility to noise
C.
Easier to modulate
D.
Lower power consumption
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Solution
Digital signals are less susceptible to noise, making them more reliable for communication compared to analog signals.
Correct Answer:
B
— Less susceptibility to noise
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Q. What is the primary application of nuclear fusion in stars?
A.
Energy production
B.
Nuclear weapons
C.
Radioactive dating
D.
Medical imaging
Show solution
Solution
Nuclear fusion in stars primarily serves as a source of energy production, converting hydrogen into helium and releasing vast amounts of energy.
Correct Answer:
A
— Energy production
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Q. What is the primary assumption of the kinetic theory of gases regarding the motion of gas molecules?
A.
Gas molecules are stationary.
B.
Gas molecules move in straight lines until they collide.
C.
Gas molecules are always in a state of vibration.
D.
Gas molecules have a fixed volume.
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Solution
The kinetic theory assumes that gas molecules move in straight lines until they collide with each other or the walls of the container.
Correct Answer:
B
— Gas molecules move in straight lines until they collide.
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Q. What is the primary bond type in polymers?
A.
Ionic bonds
B.
Covalent bonds
C.
Metallic bonds
D.
Hydrogen bonds
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Solution
Covalent bonds are the primary bond type in polymers, linking monomers together.
Correct Answer:
B
— Covalent bonds
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Q. What is the primary cause of buoyancy in fluids?
A.
Surface tension
B.
Pressure difference
C.
Viscosity
D.
Density
Show solution
Solution
Buoyancy is primarily caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer:
B
— Pressure difference
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Q. What is the primary cause of capillary action in liquids?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
Show solution
Solution
Capillary action is primarily caused by adhesion, where the liquid molecules are attracted to the surface of the solid.
Correct Answer:
B
— Adhesion
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Q. What is the primary cause of global warming?
A.
Deforestation
B.
Greenhouse gas emissions
C.
Ozone depletion
D.
Acid rain
Show solution
Solution
Greenhouse gas emissions, particularly CO2, are the primary cause of global warming.
Correct Answer:
B
— Greenhouse gas emissions
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Q. What is the primary cause of ocean acidification?
A.
Plastic pollution
B.
Increased CO2 absorption
C.
Heavy metal contamination
D.
Thermal pollution
Show solution
Solution
Ocean acidification is primarily caused by the increased absorption of CO2 from the atmosphere into ocean waters.
Correct Answer:
B
— Increased CO2 absorption
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Q. What is the primary cause of surface tension in liquids?
A.
Cohesive forces
B.
Adhesive forces
C.
Gravitational forces
D.
Electromagnetic forces
Show solution
Solution
Surface tension is primarily caused by cohesive forces between liquid molecules, which create a 'skin' at the surface.
Correct Answer:
A
— Cohesive forces
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Q. What is the primary cause of the greenhouse effect?
A.
Ozone depletion
B.
Increased solar radiation
C.
Trapping of heat by greenhouse gases
D.
Deforestation
Show solution
Solution
The greenhouse effect is primarily caused by the trapping of heat in the Earth's atmosphere by greenhouse gases.
Correct Answer:
C
— Trapping of heat by greenhouse gases
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Q. What is the primary cause of the phenomenon known as capillarity?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
Show solution
Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer:
B
— Adhesion
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Q. What is the primary cause of the phenomenon of buoyancy?
A.
Surface tension
B.
Pressure difference
C.
Viscosity
D.
Density
Show solution
Solution
Buoyancy is caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer:
B
— Pressure difference
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Q. What is the primary cause of the phenomenon of capillarity?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
Show solution
Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer:
B
— Adhesion
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