Class 9 Science
Gravitation
Question 1.
What is ‘universal law of gravitation’?
Question 2.
What is the symbol and value of gravitational constant?
Question 3.
The mass of the earth is 6 × 1024 kg and that of the moon is 7.4 × 1022 kg. If the distance between the earth and the moon is 3.84×105 km, calculate the force exerted by the earth on the moon. (Take G = 6.7 × 10–11 N-m2kg-2)
Question 4.
What is the importance of the universal law of gravitation?
Question 5.
What is ‘free fall’?
Question 6.
What is the ‘acceleration due to gravity’?
Question 7.
What is the relation between ‘gravitational constant’ and ‘gravitation due to gravity’?
Question 8.
A car falls off a ledge and drops to the ground in 1.0 s. Let g = 10 m-s–2 (for simplifying the calculations). (i) What is its speed on striking the ground? (ii) What is its average speed during the 1.0 s? (iii) How high is the ledge from the ground?
Question 9.
An object is thrown vertically upwards and rises to a height of 15 m. Calculate (i) the velocity with which the object was thrown upwards and (ii) the time taken by the object to reach the highest point.
Question 10.
How do you define the ‘weight of an object’?
Question 11.
Mass of an object is 20 kg. What is its weight on the earth?
Question 12.
An object weighs 18 N when measured on the surface of the earth. What would be its weight when measured on the surface of the moon?
Question 13.
Define pressure. Give its unit too.
Question 14.
Give statement of Archimedes’ principle.
Question 15.
Define ‘relative density’.
Question 16.
What is inverse-square law? Explain with one example.
Question 17.
What is Kepler’s law of planetary motion?
Question 18.
Mass of an object is 30 kg. What is its weight on the earth?
Question 19.
What is the value of ‘g’? How can you calculate it?
Question 20.
An object weighs 27 N when measured on the surface of the earth. What would be its weight when measured on the surface of the moon?
**********
In summary, problem-solving after learning a theoretical concept on CBSE Gravitation Class 9 Science is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.
You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.
Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.
All About Daily Practice Problems on Class 9 Science Gravitation NCERT Chapter 10
Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 9 Science Gravitation NCERT Chapter 10 useful.
Last but not least, to get the best hold on Class 9 Science Gravitation NCERT Chapter 10, do not forget to check out: