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NEET UG Gravitation — practice questions — page 4

Explore 126 free Gravitation questions in NEET UG 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 91–120 of 126.

An ellipse can be drawn using pins, a pencil and a:Read the answer and worked solution →By the law of areas, the planet to Sun line sweeps equal areas in:Read the answer and worked solution →The law of areas explains why a planet moves slower when it is:Read the answer and worked solution →By the law of periods, the square of the period is proportional to:Read the answer and worked solution →The law of periods uses which measurement of the ellipse?Read the answer and worked solution →The escape speed for the moon works out to about:Read the answer and worked solution →The moon's escape speed compared with the earth's is smaller by about:Read the answer and worked solution →The low escape speed of the moon explains why it has no:Read the answer and worked solution →Kepler's three laws describe the motion of:Read the answer and worked solution →Tycho Brahe recorded his observations using:Read the answer and worked solution →True or false on gravitationRead the answer and worked solution →Quick picks on gravitationRead the answer and worked solution →Match each law to what it saysRead the answer and worked solution →Brahe or KeplerRead the answer and worked solution →Near the Sun or farRead the answer and worked solution →Type the numberRead the answer and worked solution →Fill the gaps on gravitationRead the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →Kepler derived his three laws by analysing naked-eye planetary records compiled by whom?Read the answer and worked solution →For Earth's orbit, the ratio of semi-minor to semi-major axis b/a is closest to:Read the answer and worked solution →Kepler's second law follows from angular momentum conservation, which holds for:Read the answer and worked solution →For a planet orbiting the Sun, which is NOT conserved?Read the answer and worked solution →An astronaut in orbit feels weightless because:Read the answer and worked solution →A body placed inside a hollow metal sphere is shielded from the gravity of outside masses:Read the answer and worked solution →The gravitational force between two arbitrary finite rigid bodies is:Read the answer and worked solution →The familiar expression mgh for gravitational potential energy is:Read the answer and worked solution →In which year did Henry Cavendish first measure the gravitational constant G?Read the answer and worked solution →The conventional value of standard gravity g_n, fixed by the CGPM in 1901, is:Read the answer and worked solution →An object at sea level weighs roughly how much more at the poles than at the Equator?Read the answer and worked solution →Besides Earth's spin, what lowers g at the Equator?Read the answer and worked solution →

Worked practice questions

An ellipse can be drawn using pins, a pencil and a:

  1. A steel compass
  2. A plastic scale
  3. A length of string
  4. A wooden ruler
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Correct answer: C. A length of string

1. The two pins mark the foci of the ellipse. 2. Something must be held taut between them. 3. That is a length of string. _Source: syllabus Physics Part I, Chapter 8, Gravitation._

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By the law of areas, the planet to Sun line sweeps equal areas in:

  1. Equal turns
  2. Equal orbits
  3. Equal seasons
  4. Equal times
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Correct answer: D. Equal times

1. The second law compares areas swept out along the orbit. 2. Those areas are measured over intervals of time. 3. Equal areas are swept in equal intervals of time. _Source: syllabus Physics Part I, Chapter 8, Gravitation._

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The law of areas explains why a planet moves slower when it is:

  1. Farther out
  2. Nearer in
  3. At the focus
  4. At the centre
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Correct answer: A. Farther out

1. Sweeping equal areas takes a longer arc when close in. 2. Farther out, a shorter arc covers the same area. 3. So the planet moves slower when farther from the sun. _Source: syllabus Physics Part I, Chapter 8, Gravitation._

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