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Understanding the concept of gravitation in Class 11 Physics is crucial for building a strong foundation in physics. Chapter 8, Gravitation, deals with key ideas such as Newton’s law of gravitation, gravitational force, and acceleration due to gravity, which are often tested through Gravitation MCQ. Whether you’re preparing for CBSE exams or competitive exams, these MCQs on gravitation lass 11 Physics help reinforce concepts such as the law of gravitation, gravitational potential energy, and real-world applications.
Practicing mcq questions on gravitation for class 11 with solutions enhances your understanding of how forces act on objects, gravitational fields, and the concept of mass and weight. For quick revision, students can also refer to Gravitation mcq class 11 physics pdf for detailed solutions and practice.
Common topics in these quizzes include gravitational force, universal law of gravitation, acceleration due to gravity, and related objective questions. These Class 11 Physics chapter 8 MCQs challenge your understanding of concepts like weightlessness, orbital motion, and escape velocity.
Whether you are attempting a gravitation MCQ quiz or solving physics MCQs on gravitational concepts, these questions offer an excellent way to test your knowledge. Prepare effectively with this content and master gravitation with ease!
Class 11 Physics Gravitation Overview
Class 11 Physics Gravitation MCQ with Answers
These multiple-choice questions (MCQs) are designed based on the latest CBSE syllabus and NCERT curriculum. Solving them will help you gain a deeper understanding of the chapter and prepare for the final exam. The correct answers and explanations are provided below each question.
1. Newton’s law of universal gravitation force is given by:
- F = Gm₁m₂ / r⁴
- F = Gm₁m₂ / r²
- F = G(m₁ + m₂) / r²
- F = G(m₁ – m₂) / r²
Answer: b. F = Gm₁m₂ / r²
Explanation: According to Newton’s law of universal gravitation, the gravitational force (F) between two masses (m₁ and m₂) is directly proportional to the product of their masses and inversely proportional to the square of the distance (r) between them. Hence, the correct formula is F = Gm₁m₂ / r².
2. Which law describes the orbits of planets around the sun?
- Newton’s law
- Faraday’s law
- Kepler’s law
- Kirchhoff’s Law
Answer: b. Kepler’s law
Explanation: Kepler’s laws describe the motion of planets in elliptical orbits around the Sun. These laws help us understand planetary movements and the relationship between a planet’s distance from the Sun and its orbital period.
3. The sum of kinetic and potential energy is when a missile is launched with a velocity less than the escape velocity.
- 0
- Negative
- Positive
- None of these options
Answer: b. Negative
Explanation: When a missile is launched with a velocity less than the escape velocity, its total mechanical energy (the sum of kinetic and potential energy) is negative. This means the missile does not have enough energy to escape Earth’s gravity.
4. If the distance between the Earth and the Sun doubles, what would be the duration of the year?
- 365 days
- 366 days
- 730 days
- 1032 days
Answer: d. 1032 days
Explanation: According to Kepler’s third law, the square of the orbital period (T) is directly proportional to the cube of the semi-major axis (a). If the distance between Earth and the Sun doubles, the orbital period (T) will increase by a factor of 8, making the year approximately 1032 days long.
5. What would be the maximum height reached by the body if the body is projected vertically from the surface of the earth of radius R with a velocity equal to half of the escape velocity?
- 2 + R
- R
- R/2
- R/3 (Correct Answer)
Answer: d. R/3
Explanation: If a body is projected with half the escape velocity, it will reach a height equal to one-third of Earth’s radius (R/3). This is because the escape velocity is the minimum velocity required to overcome Earth’s gravity, and half of this velocity results in reaching a fraction of the Earth’s radius.
6. In a manned satellite, people experience no gravity, and this phenomenon is known as:
- Gravity-weight
- Gravitational weight
- Weightlessness
- Less-weight gravity
Answer: c. Weightlessness
Explanation: Weightlessness occurs when objects are in free fall, such as in orbit. In orbit, the satellite and everything inside it are falling towards Earth at the same rate, so the occupants feel weightless.
7. Dimensional formula for gravitational intensity is:
- [L T²]
- [L T⁻²]
- [L T]
- [L T⁻⁴]
Answer: b. [L T⁻²]
Explanation: Gravitational intensity is defined as the force per unit mass. Its dimensional formula is [L T⁻²], where L represents length and T represents time. This formula is derived from the equation for gravitational force.
8. Gravitational force on a particle inside a spherical shell is:
- 1
- -1
- 0
- None of the option
Answer: c. 0
Explanation: According to the shell theorem, the net gravitational force on a particle inside a uniform spherical shell is zero. This means that no matter where you are inside the shell, the forces from the shell cancel each other out.
9. The satellite having the same time period of revolution as that of the Earth is called:
- Stationary satellite
- Geostationary satellite
- Gravitational satellite
- Geo satellite
Answer: b. Geostationary satellite
Explanation: A geostationary satellite has the same orbital period as Earth (24 hours) and orbits above the equator. It remains stationary relative to a specific point on Earth’s surface, making it ideal for communication and weather monitoring.
10. State true or false: The gravitational force is a conservative force.
- True
- False
Answer: a. True
Explanation: The gravitational force is a conservative force, meaning that the work done by gravity on an object depends only on the initial and final positions of the object, not on the path taken.
FAQs on Gravitation MCQ Class 11 Physics
What is Newton's law of universal gravitation?
Newton's law of universal gravitation states that every mass exerts an attractive force on every other mass, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The formula is F = Gm₁m₂ / r², where G is the gravitational constant, m₁ and m₂ are the masses of the objects, and r is the distance between them.
What is the significance of Kepler’s laws in gravitation?
Kepler's laws describe the motion of planets around the Sun. They are important for understanding how planets move in elliptical orbits, how the orbital period is related to the distance from the Sun, and how the speed of a planet changes along its orbit. Kepler's laws form the foundation for understanding orbital mechanics and the behavior of celestial bodies in space.
How does gravity affect satellites in orbit?
Gravity keeps satellites in orbit by continuously pulling them toward the Earth, preventing them from flying off into space. For a satellite to stay in a stable orbit, it needs to travel at a specific speed. This balance between the satellite’s forward motion and the gravitational pull of the Earth creates a circular or elliptical orbit.