Q. What is the potential energy of a system of two charges +3μC and +4μC separated by 0.2m?
A.
0.54 J
B.
0.72 J
C.
0.36 J
D.
0.18 J
Show solution
Solution
U = k * (q1 * q2) / r = (9 × 10^9) * (3 × 10^-6 * 4 × 10^-6) / 0.2 = 0.54 J.
Correct Answer:
B
— 0.72 J
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Q. What is the potential energy of a system of two charges +3μC and +5μC separated by 0.2m?
A.
-6.75 J
B.
6.75 J
C.
0.75 J
D.
-0.75 J
Show solution
Solution
Potential energy U = k * (q1 * q2) / r = (9 × 10^9) * (3 × 10^-6) * (5 × 10^-6) / 0.2 = 6.75 J.
Correct Answer:
B
— 6.75 J
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Q. What is the potential energy of a system of two charges +3μC and -5μC separated by 0.3m?
A.
-0.45 J
B.
0.45 J
C.
-0.15 J
D.
0.15 J
Show solution
Solution
Potential energy U = k * q1 * q2 / r = (9 × 10^9) * (3 × 10^-6) * (-5 × 10^-6) / 0.3 = -0.45 J.
Correct Answer:
A
— -0.45 J
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Q. What is the potential energy of a system of two charges +5μC and +10μC separated by 0.2m?
A.
-0.225 J
B.
0.225 J
C.
0.45 J
D.
0.9 J
Show solution
Solution
Potential energy U = k * (q1 * q2) / r = (9 × 10^9) * (5 × 10^-6) * (10 × 10^-6) / 0.2 = 0.225 J.
Correct Answer:
B
— 0.225 J
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Q. What is the potential energy of a system of two charges +q and +q separated by a distance r?
A.
0
B.
k*q²/r
C.
-k*q²/r
D.
2k*q²/r
Show solution
Solution
Potential energy U = k * (q1 * q2) / r = k * (q * q) / r = k*q²/r.
Correct Answer:
B
— k*q²/r
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Q. What is the potential energy of a system of two charges of +1μC and -1μC separated by 0.1m?
A.
-0.09 J
B.
0.09 J
C.
-0.18 J
D.
0.18 J
Show solution
Solution
Potential energy U = k * q1 * q2 / r = (9 × 10^9) * (1 × 10^-6) * (-1 × 10^-6) / 0.1 = -0.09 J.
Correct Answer:
A
— -0.09 J
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Q. What is the potential energy of a system of two point charges +q and -q separated by a distance r?
A.
0
B.
kq²/r
C.
-kq²/r
D.
kq/r
Show solution
Solution
The potential energy U of a system of two point charges is given by U = k(q1q2)/r = -kq²/r for +q and -q.
Correct Answer:
C
— -kq²/r
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Q. What is the potential energy of a system of two point charges q1 and q2 separated by a distance r?
A.
k * q1 * q2 / r
B.
k * q1 * q2 * r
C.
k * (q1 + q2) / r
D.
k * (q1 - q2) / r
Show solution
Solution
The potential energy U of a system of two point charges is given by U = k * q1 * q2 / r.
Correct Answer:
A
— k * q1 * q2 / r
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Q. What is the potential energy stored in a spring when it is compressed by a distance x?
A.
1/2 kx
B.
1/2 kx²
C.
kx
D.
kx²
Show solution
Solution
The potential energy (PE) stored in a spring is given by PE = 1/2 kx², where k is the spring constant and x is the displacement.
Correct Answer:
B
— 1/2 kx²
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Q. What is the power consumed by a 10 ohm resistor when a current of 2 A flows through it?
A.
20 W
B.
40 W
C.
10 W
D.
5 W
Show solution
Solution
Power P = I^2 * R = (2 A)^2 * 10Ω = 4 * 10 = 40 W.
Correct Answer:
B
— 40 W
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Q. What is the power consumed by a 10 ohm resistor when a current of 3 A flows through it?
A.
30 W
B.
90 W
C.
60 W
D.
15 W
Show solution
Solution
Power P = I^2 * R = (3 A)^2 * 10 ohms = 9 * 10 = 90 W.
Correct Answer:
B
— 90 W
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Q. What is the power consumed by a 10Ω resistor when a current of 2A flows through it?
A.
20W
B.
40W
C.
10W
D.
5W
Show solution
Solution
Power P = I^2 * R = (2A)^2 * 10Ω = 4A^2 * 10Ω = 40W.
Correct Answer:
A
— 20W
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Q. What is the power consumed by a 12 V battery supplying a current of 2 A?
A.
24 W
B.
12 W
C.
6 W
D.
48 W
Show solution
Solution
Power is given by P = V * I = 12 V * 2 A = 24 W.
Correct Answer:
A
— 24 W
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Q. What is the power consumed by a 5 ohm resistor carrying a current of 3 A?
A.
15 W
B.
9 W
C.
5 W
D.
3 W
Show solution
Solution
Power P = I^2 * R = (3 A)^2 * 5 ohms = 9 * 5 = 45 W.
Correct Answer:
A
— 15 W
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Q. What is the power consumed by a 5 ohm resistor when a current of 2A flows through it?
A.
10W
B.
20W
C.
5W
D.
15W
Show solution
Solution
Power P = I^2 * R = (2A)^2 * 5 ohms = 4 * 5 = 20W.
Correct Answer:
B
— 20W
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Q. What is the power consumed by a 5 ohm resistor when a current of 3 A flows through it?
A.
15 W
B.
9 W
C.
5 W
D.
3 W
Show solution
Solution
Power P = I^2 * R = (3 A)^2 * 5 ohms = 9 * 5 = 45 W.
Correct Answer:
A
— 15 W
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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 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 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
Show solution
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.
Show solution
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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Physics Syllabus (JEE Main) MCQ & Objective Questions
The Physics Syllabus for JEE Main is crucial for students aiming to excel in their exams. Understanding this syllabus not only helps in grasping fundamental concepts but also enhances problem-solving skills through practice. Engaging with MCQs and objective questions is essential for effective exam preparation, as it allows students to identify important questions and strengthen their knowledge base.
What You Will Practise Here
Mechanics: Laws of Motion, Work, Energy, and Power
Thermodynamics: Laws of Thermodynamics, Heat Transfer
Waves and Oscillations: Simple Harmonic Motion, Wave Properties
Electromagnetism: Electric Fields, Magnetic Fields, and Circuits
Optics: Reflection, Refraction, and Optical Instruments
Modern Physics: Quantum Theory, Atomic Models, and Nuclear Physics
Fluid Mechanics: Properties of Fluids, Bernoulli's Principle
Exam Relevance
The Physics Syllabus (JEE Main) is integral to various examinations, including CBSE, State Boards, and competitive exams like NEET and JEE. Questions often focus on conceptual understanding and application of theories. Common patterns include numerical problems, conceptual MCQs, and assertion-reason type questions, which test both knowledge and analytical skills.
Common Mistakes Students Make
Misinterpreting the question stem, leading to incorrect answers.
Neglecting units and dimensions in calculations.
Overlooking the significance of diagrams in understanding concepts.
Confusing similar concepts, such as velocity and acceleration.
Failing to apply formulas correctly in different contexts.
FAQs
Question: What are the key topics in the Physics Syllabus for JEE Main?Answer: Key topics include Mechanics, Thermodynamics, Waves, Electromagnetism, Optics, Modern Physics, and Fluid Mechanics.
Question: How can I improve my performance in Physics MCQs?Answer: Regular practice of MCQs, understanding concepts deeply, and revising important formulas can significantly enhance your performance.
Start solving practice MCQs today to test your understanding of the Physics Syllabus (JEE Main). This will not only boost your confidence but also prepare you effectively for your upcoming exams. Remember, consistent practice is the key to success!
