Gravitation: Universal Law, Free Fall & Orbits: 18 MCQs
All 18 multiple-choice questions from this kit, free and with no sign-up.
Warm-up · 8 questions
Q1. Which statement best describes the nature of the gravitational force between two masses?
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Q2. The gravitational force between two objects is $F$. If the distance between them is doubled, the new force is:
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Q3. The SI unit of the universal gravitational constant $G$ is:
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Q4. An astronaut in orbit feels weightless because:
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Q5. A body has mass 10 kg on Earth. What is its mass on the Moon?
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Q6. Which quantity is a force?
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Q7. The value of $g$ at Earth's surface is approximately:
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Q8. Newton's law of universal gravitation states $F = G m_1 m_2 / r^2$, with $G = 6.67 \times 10^{-11}\ \text{N m}^2/\text{kg}^2$.
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Building up · 5 questions
Q9. A satellite is in a low circular orbit around Earth. Its orbital speed is about:
IntermediateAnswers and explanations are in the Veda app.
Q10. The gravitational force between two masses is $F$. If both masses are doubled and the distance is halved, the new force is:
IntermediateAnswers and explanations are in the Veda app.
Q11. Why does the Moon not crash into Earth?
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Q12. A 1 kg book rests on a table. The gravitational force between Earth and the book is approximately:
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Q13. A feather and a hammer are dropped on the Moon. What happens?
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Topper level · 5 questions
Q14. The gravitational force between two everyday objects is negligible mainly because:
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Q15. A satellite is moved from Earth's surface to an altitude equal to Earth's radius. By what factor does the gravitational force on it change?
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Q16. Which observation most directly supports the inverse-square law of gravitation?
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Q17. A satellite is in a low circular orbit around Earth at an altitude of 400 km. Calculate the gravitational force acting on a 1000 kg satellite. Use the formula $$F = G \frac{m_1 m_2}{r^2}$$ where $m_1 = 6 \times 10^{24}\ \text{kg}$ (mass of Earth), $m_2 = 1000\ \text{kg}$ (mass of the satellite), and $r = R + h$ with $R = 6.4 \times 10^6\ \text{m}$ (radius of Earth) and $h = 400 \times 10^3\ \text{m}$ (altitude).
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Q18. Using Kepler's third law, if a planet orbits a star at a distance of 2 AU (astronomical units), what is the ratio of its orbital period squared to the cube of its semi-major axis? Assume the star's mass is similar to that of the Sun. Express your answer in terms of the formula $$T^2 \propto a^3$$.
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