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Indian Navy 10+2 B.Tech Cadet Gravitation — practice questions

Explore 27 free Gravitation questions in Indian Navy 10+2 B.Tech Cadet Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Gravitation questions and exercises with answers

Showing questions 1–27 of 27.

Escape velocity from Earth's surface is approximately:Read the answer and worked solution →Gravitational potential energy of a mass m at the surface of Earth (taking U at infinity as zero):Read the answer and worked solution →Gravitational field strength I (also called g) at distance r from a point mass M:Read the answer and worked solution →As per your syllabus, Newton's UNIVERSAL law of gravitation states that F between two point masses is proportional to which?Read the answer and worked solution →As per your syllabus, using g and R_E gives M_E ≈ which value?Read the answer and worked solution →As per your syllabus, the dimensions of g (acceleration due to gravity) are which?Read the answer and worked solution →As per your syllabus, the gravitational potential energy is a scalar quantity with dimensions which?Read the answer and worked solution →Conserved, or not conserved?Read the answer and worked solution →True or false: conservation under gravityRead the answer and worked solution →Complete the weightlessness explanationRead the answer and worked solution →True or false: weightlessnessRead the answer and worked solution →Kepler's third lawRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every quantity conserved for orbital motionRead the answer and worked solution →Flip and pair: law with what it saysRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the reasoning: why an astronaut floatsRead the answer and worked solution →True or false: Kepler's lawsRead the answer and worked solution →Which law is being described?Read the answer and worked solution →Orbits and satellitesRead the answer and worked solution →Tap every true statement about orbital motionRead the answer and worked solution →Complete Kepler's third lawRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Flip and pair: statement with its subjectRead the answer and worked solution →Assertion and reason: orbitsRead the answer and worked solution →

Worked practice questions

Escape velocity from Earth's surface is approximately:

  1. 9.8 m/s
  2. 30 km/s
  3. 11.2 km/s
  4. 7.9 km/s
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Correct answer: C. 11.2 km/s

v_esc = √(2GM/R) ≈ 11.2 km/s for Earth. This is the minimum velocity needed to escape Earth's gravity without further propulsion.

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Gravitational potential energy of a mass m at the surface of Earth (taking U at infinity as zero):

  1. GMm/R
  2. Zero
  3. -GMm/R
  4. mgh
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Correct answer: C. -GMm/R

U = -GMm/r. At Earth's surface (r = R), U = -GMm/R. Negative because work must be done against gravity to bring it to infinity.

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Gravitational field strength I (also called g) at distance r from a point mass M:

  1. I = GM/r²
  2. I = M/r
  3. I = GMm/r²
  4. I = GM/r
Show answer and solution

Correct answer: A. I = GM/r²

Gravitational field strength is force per unit test mass: I = F/m_test = GM/r². Same form as gravitational acceleration g, since for a test mass m, F = m × I = m × g.

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