Q. A solid sphere of mass M and radius R rolls without slipping down an inclined plane of height h. What is the speed of the center of mass of the sphere at the bottom of the incline? (2021)
A.
√(2gh)
B.
√(3gh/2)
C.
√(gh)
D.
√(4gh/3)
Solution
Using conservation of energy, potential energy at the top = kinetic energy at the bottom. The total kinetic energy is the sum of translational and rotational kinetic energy. Thus, mgh = (1/2)mv^2 + (1/5)mv^2, leading to v = √(10gh/7).
Q. A solid sphere of mass M and radius R rolls without slipping down an inclined plane of height h. What is the speed of the center of mass of the sphere when it reaches the bottom? (2021)
A.
√(2gh)
B.
√(5gh/7)
C.
√(3gh/5)
D.
√(gh)
Solution
Using conservation of energy, potential energy at the top = kinetic energy at the bottom. The total kinetic energy is the sum of translational and rotational kinetic energy. Thus, v = √(5gh/7).
Q. A uniform rod of length L and mass M is pivoted at one end and allowed to fall under gravity. What is the angular acceleration of the rod just after it is released? (2019)
A.
g/L
B.
2g/L
C.
3g/L
D.
g/2L
Solution
The torque τ = Mg(L/2) and moment of inertia I = (1/3)ML². Using τ = Iα, we find α = 3g/2L.
Q. A uniform rod of length L and mass M is pivoted at one end and released from rest. What is the angular velocity of the rod just before it hits the ground? (2019)
A.
√(3g/L)
B.
√(2g/L)
C.
√(g/L)
D.
√(4g/L)
Solution
Using conservation of energy, potential energy at the top is converted to rotational kinetic energy at the bottom. The angular velocity ω can be found using the relation ω = √(3g/L).
Q. A uniform rod of length L and mass M is pivoted at one end and released from rest. What is the angular speed of the rod just before it hits the ground? (2019)
A.
√(3g/L)
B.
√(2g/L)
C.
√(g/L)
D.
√(4g/L)
Solution
Using conservation of energy, potential energy at the top converts to rotational kinetic energy at the bottom. The angular speed ω = √(3g/L).
Q. A wheel of radius R and mass M is rolling without slipping on a horizontal surface. If it has a linear speed v, what is its total kinetic energy? (2022)
A.
(1/2)Mv²
B.
(1/2)Mv² + (1/2)(Iω²)
C.
(1/2)Mv² + (1/2)(Mv²)
D.
(1/2)Mv² + (1/2)(Mv²/2)
Solution
The total kinetic energy is the sum of translational and rotational kinetic energy. K.E. = (1/2)Mv² + (1/2)(Iω²) where I = (1/2)MR² for a solid cylinder.
Q. A wheel of radius R is rolling without slipping on a horizontal surface. If the wheel has an angular velocity ω, what is the linear velocity of the center of the wheel? (2023)
A.
Rω
B.
ω/R
C.
ω
D.
2Rω
Solution
The linear velocity v of the center of the wheel is given by v = Rω.
Q. A wire of length L and diameter d is stretched by a force F. If the diameter is halved while keeping the length constant, what happens to the stress? (2020)
A.
It doubles
B.
It quadruples
C.
It halves
D.
It remains the same
Solution
Stress = Force / Area. Halving the diameter increases the area by a factor of 1/4, thus stress quadruples.
Q. A wire of length L and diameter d is stretched by a force F. If the diameter is doubled, what will be the new elongation if the same force is applied? (2019)
A.
L/4
B.
L/2
C.
L
D.
2L
Solution
Elongation is inversely proportional to the area. Doubling the diameter increases the area by a factor of 4, thus elongation becomes L/4.
Q. A wire of length L and diameter d is stretched by a force F. If the diameter is halved while keeping the length constant, what happens to the stress in the wire? (2022)
A.
It doubles
B.
It quadruples
C.
It remains the same
D.
It halves
Solution
Stress (σ) = Force (F) / Area (A). Halving the diameter increases the area by a factor of 4, thus stress quadruples.
Physics is a crucial subject for students preparing for NEET and other competitive exams. Mastering Physics (NEET) through MCQs and objective questions not only enhances conceptual clarity but also boosts your confidence for the exam. Regular practice of important questions helps in identifying weak areas and improves overall performance in exams.
What You Will Practise Here
Mechanics: Laws of Motion and their applications
Thermodynamics: Key principles and formulas
Electromagnetism: Concepts of electric fields and circuits
Optics: Reflection, refraction, and lens formulas
Waves: Sound waves and their properties
Modern Physics: Basics of quantum mechanics and atomic structure
Units and Measurements: Significant figures and dimensional analysis
Exam Relevance
Physics is a significant part of the syllabus for CBSE, State Boards, NEET, and JEE. In these exams, you can expect a variety of question patterns, including conceptual MCQs, numerical problems, and application-based questions. Understanding the core concepts and practicing Physics (NEET) MCQ questions will help you tackle these questions effectively and efficiently.
Common Mistakes Students Make
Misinterpreting the question stem, leading to incorrect answers.
Neglecting units and dimensions in numerical problems.
Overlooking the significance of diagrams in understanding concepts.
Confusing similar concepts, such as velocity and acceleration.
FAQs
Question: How can I improve my Physics (NEET) scores? Answer: Regular practice of MCQs and understanding the underlying concepts will significantly enhance your scores.
Question: Are there specific topics I should focus on for NEET Physics? Answer: Focus on Mechanics, Thermodynamics, and Electromagnetism, as these areas frequently appear in exams.
Start solving practice MCQs today to test your understanding and solidify your knowledge in Physics. Remember, consistent practice is the key to success in your exam preparation!
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