In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 11 Physics Chapter 8 Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve Class 11 Physics Case Study Questions Gravitation to know their preparation level.
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In CBSE Class 11 Physics Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Gravitation Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 11 Physics Chapter 8 Gravitation
Case Study/Passage-Based Questions
Case Study 1: Satellites in a circular orbit around the earth in the equatorial plane with T = 24 hours are called Geostationary Satellites. Clearly, since the earth rotates within the same period, the satellite would appear fixed from any point on Earth. It takes very powerful rockets to throw up a satellite to such large heights above the earth but this has been done in view of the several benefits of much practical application. The weight of an object is the force with which the earth attracts it. We are conscious of our own weight when we stand on a surface since the surface exerts a force opposite to our weight to keep us at rest. The same principle holds good when we measure the weight of an object by a Spring balance hung from a fixed point e.g. the ceiling. The object would fall down unless it is subject to a force opposite to gravity. This is exactly what the spring exerts on the object. This is because the spring is pulled down a little by the gravitational pull of the object and in turn, the spring exerts a force on the object vertically upwards. Now, imagine that the top end of the balance is no longer held fixed to the top ceiling of the room. Both ends of the spring as well as the object move with identical acceleration g. The spring is not stretched and does not exert any upward force on the object which is moving down with acceleration g due to gravity. The reading recorded in the spring balance is zero since the spring is not stretched at all. If the object were a human being, he or she will not feel his weight since there is no upward force on him. Thus, when an object is in free fall, it is weightless and this phenomenon is usually called the phenomenon of weightlessness. In a satellite around the earth, every part and parcel of the satellite has acceleration towards the center of the earth which is exactly the value of the earth’s acceleration due to gravity at that position. Thus in the satellite, everything inside it is in a state of free fall. This is just as if we were falling towards the earth from a height. Thus, in a manned satellite, people inside experience no gravity. Gravity for us defines the vertical direction and thus for them there are no horizontal or vertical directions, all directions are the same.
1) Astronaut experiences weightlessness in space because
- a) Acceleration due to gravity is zero
- b) Actual weight of the astronaut is zero
- c) They are going with the same acceleration due to gravity
- d) None of these
Answer: c) They are going with same acceleration due to gravity
2) Weighing machine measures
- a) Mass of the person
- b) Normal reaction exerted by machine on person
- c) Both a and b
- d) None of these
Answer:b) Normal reaction exerted by machine on person
What are Geostationary Satellites?
A) Satellites rotating faster than the Earth.
B) Satellites in a circular orbit with T = 24 hours, appearing fixed from any point on Earth.
C) Satellites that are closer to the poles.
D) Satellites that rotate opposite to the Earth’s rotation.
Answer: B
Why do we feel our weight when standing on a surface?
A) Because gravity pushes us upwards.
B) Because the surface exerts a force opposite to our weight, keeping us at rest.
C) Because our weight is always directed sideways.
D) Because of the magnetic field of the Earth.
Answer: B
What is recorded in a spring balance when an object is in free fall?
A) The weight of the object.
B) Double the weight of the object.
C) Zero, since the spring is not stretched.
D) An erratic value due to gravitational forces.
Answer: C
Why do objects inside a satellite experience weightlessness?
A) Because gravity doesn’t exist in space.
B) Because everything inside the satellite is in a state of free fall.
C) Because the satellite moves at the speed of light.
D) Because objects inside are not affected by gravity.
Answer: B
What is the consequence of weightlessness for people inside a manned satellite?
A) They feel heavier than on Earth.
B) They can distinguish between horizontal and vertical directions.
C) They feel no gravity and there are no distinct horizontal or vertical directions.
D) They are attracted to the walls of the satellite.
Answer: C
How is weight measured using a spring balance?
A) The spring exerts a force on the object vertically downwards.
B) The object pulls the spring down by gravitational pull, and the spring exerts an upward force.
C) The spring is compressed by the object’s weight.
D) The object’s weight causes the spring to expand horizontally.
Answer: B
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