Mastering Gravitation: Your Ultimate Class 9 Physics Quiz

Test your knowledge on Gravitation from Physics, Class 9.

The chapter "Gravitation" in Class 9 Physics is a foundational cornerstone, not just for understanding our physical world, but also for success in your CBSE Board Exams. It introduces you to Newton's Universal Law of Gravitation, explaining why apples fall and planets orbit, and delving into concepts like free fall, mass, weight, thrust, pressure, and buoyancy. A strong grasp of these principles is crucial, as they form the bedrock for advanced topics in physics in higher classes.

This chapter often features a mix of conceptual questions, numerical problems, and reasoning-based inquiries in examinations. Thorough preparation, including solving practice questions, is key to scoring well. By mastering "Gravitation," you not only ensure good marks in your Class 9 assessments but also build a robust conceptual framework essential for Class 11 and competitive exams where these concepts are explored in greater depth.

30

Minutes

30

Questions

4 / -1

Marking Scheme

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Questions in this Quiz

Q1: Which of the following statements correctly describes Newton's Universal Law of Gravitation?

  • The force between two objects is directly proportional to the product of their masses and inversely proportional to the distance between them.

  • The force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

  • The force between two objects is directly proportional to the sum of their masses and inversely proportional to the square of the distance between them.

  • The force between two objects is inversely proportional to the product of their masses and directly proportional to the square of the distance between them.

Q2: What is the SI unit of the Universal Gravitational Constant (G)?

  • N kg2m2\text{N kg}^2 \text{m}^{-2}

  • N m2kg2\text{N m}^2 \text{kg}^{-2}

  • N m2kg2\text{N m}^{-2} \text{kg}^2

  • N kg2m2\text{N kg}^{-2} \text{m}^2

Q3: The value of the Universal Gravitational Constant (G) is approximately:

  • 6.67×1011N m2kg26.67 \times 10^{-11} \text{N m}^2 \text{kg}^{-2}

  • 9.8m/s29.8 \text{m/s}^2

  • 6.022×1023mol16.022 \times 10^{23} \text{mol}^{-1}

  • 3×108m/s3 \times 10^8 \text{m/s}

Q4: If the distance between two objects is doubled, how does the gravitational force between them change?

  • It becomes half.

  • It becomes double.

  • It becomes one-fourth.

  • It becomes four times.

Q5: Which of the following statements is true regarding the acceleration due to gravity (g)?

  • It is a universal constant.

  • Its value is the same everywhere on Earth.

  • Its value varies with altitude and depth.

  • It depends on the mass of the falling object.

Q6: An object is dropped from a height near the Earth's surface. What is its initial velocity?

  • 9.8m/s9.8 \text{m/s}

  • 0m/s0 \text{m/s}

  • Depends on its mass

  • Depends on the height

Q7: What is the SI unit of weight?

  • Kilogram (kg)

  • Newton (N)

  • Gram (g)

  • Kilogram-force (kgf)

Q8: Which of the following is NOT a factor affecting the acceleration due to gravity (g) on Earth?

  • Altitude of the object

  • Depth inside the Earth

  • Latitude on Earth

  • Mass of the object

Q9: What is the relationship between mass (m) and weight (W) of an object on Earth?

  • W=m/gW = m/g

  • W=mgW = mg

  • m=Wgm = Wg

  • W=m+gW = m + g

Q10: An object has a mass of 10 kg on Earth. What will be its mass on the Moon?

  • 10 kg

  • 10/6 kg10/6 \text{ kg}

  • 10×6 kg10 \times 6 \text{ kg}

  • 1.67 kg1.67 \text{ kg}

...and 20 more questions.

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