NEET Physics: Gravitation — MCQ Test 13

Q6. A moon orbits a planet with a period of 13 days and radius \( 1.0 \times 10^9 \, \text{m} \). What is the planet’s mass? (\( G = 6.67 \times 10^{-11} \, \text{N m}^2/\text{kg}^2, 1 \, \text{day} = 86400 \, \text{s} \))

Q7. Three \( 2 \, \text{kg} \) masses form an equilateral triangle of side \( 1 \, \text{m} \). What is the potential energy? (\( G = 6.67 \times 10^{-11} \, \text{N m}^2/\text{kg}^2 \))

Q8. How much energy is required to move a \( 600 \, \text{kg} \) satellite from \( 10 R_E \) to \( 20 R_E \) from Earth’s center? (\( M_E = 6 \times 10^{24} \, \text{kg}, R_E = 6.4 \times 10^6 \, \text{m}, G = 6.67 \times 10^{-11} \, \text{N m}^2/\text{kg}^2 \))

Q9. What ensures that a satellite remains in a stable circular orbit?

Q10. A body is projected from Earth with \( 13 \, \text{km/s} \). What is its speed far away? (Escape speed = \( 11.2 \, \text{km/s} \))

NEET Physics — Gravitation

Free MCQ Test 13 of 25

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Why does Kepler’s first law indicate that planetary orbits are not perfectly circular?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Gravitation. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Indicate, Planetary, Perfectly, Circular, Gravitational, and Potential.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. Why does Kepler’s first law indicate that planetary orbits are not perfectly circular?

  • A. The Sun is not at the center
  • B. Orbits are elliptical with the Sun at one focus
  • C. Planets move at constant speed
  • D. Gravitational force varies linearly

Q2. Why is the gravitational potential energy negative in a bound system?

  • A. The force is repulsive
  • B. Work is required to reach infinity
  • C. Energy is lost to friction
  • D. The system is unbound

Q3. What is the gravitational potential due to Earth at \( 3.84 \times 10^7 \, \text{m} \) from its center? (\( M_E = 6 \times 10^{24} \, \text{kg}, G = 6.67 \times 10^{-11} \, \text{N m}^2/\text{kg}^2 \))

  • A. -1.0 × 10⁷ J/kg
  • B. -1.1 × 10⁷ J/kg
  • C. -1.2 × 10⁷ J/kg
  • D. -1.3 × 10⁷ J/kg

Q4. Why does a satellite in a circular orbit have negative total energy?

  • A. Kinetic energy is zero
  • B. Potential energy exceeds kinetic energy
  • C. It is moving away from Earth
  • D. Gravitational force is repulsive

Q5. What is the escape speed from a planet with \( g = 4.9 \, \text{m/s}^2 \) and radius \( 3.2 \times 10^6 \, \text{m} \)?

  • A. 5.0 km/s
  • B. 5.6 km/s
  • C. 6.0 km/s
  • D. 6.5 km/s

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