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Gravity - Quiz
Contributed by: Salmon
  • 1. How are physical models of gravity expressed?
A) Mathematically
B) Philosophically
C) Verbally
D) Geometrically
  • 2. Why do physicists use several different models of gravity?
A) Because one model is always incorrect
B) To disprove Newtonian physics
C) To satisfy historical requirements
D) Depending on the problem or to gain physical intuition
  • 3. What law does Newton use to model gravity as a force?
A) Inverse square law
B) Inverse cube law
C) Law of universal acceleration
D) Law of nonlocal forces
  • 4. In Newton's law of gravity, the force F is proportional to what?
A) Mass of the objects
B) Velocity of the objects
C) Distance between the objects squared
D) Volume of the objects
  • 5. What does the gravitational force cause objects to do, unless balanced by other forces?
A) Move away from each other
B) Remain completely stationary
C) Accelerate towards each other
D) Orbit in circles
  • 6. How is Newton's gravitational force described in terms of its location dependency?
A) Nonlocal
B) Local
C) Constant
D) Instantaneous
  • 7. What did scientists from Newton onwards recognize about action at a distance?
A) It is completely false
B) It requires the theory of relativity to work
C) It does not explain the root cause of the force
D) It only applies to planetary orbits
  • 8. What physical effect is explained by Newton's model?
A) Cannon ball trajectories
B) Time dilation
C) Quantum entanglement
D) Black hole evaporation
  • 9. Which of the following is also explained by Newton's gravitational model according to the text?
A) Atmospheric pressure
B) Magnetic fields
C) Sound waves
D) Tidal motion
  • 10. What type of orbits are explained by Newtonian action-at-a-distance?
A) Electron orbits
B) Planetary orbits
C) Cometary plasma orbits
D) Atomic orbits
  • 11. What must be combined with gravity to create a theory independent of action at a distance?
A) Quantum mechanics
B) The concept of relativity
C) Electromagnetism
D) Thermodynamics
  • 12. What kind of task is it to combine relativity with gravity using the Newtonian model?
A) Simple and straightforward
B) Enormously complex
C) Already completed by Newton
D) Mathematically impossible
  • 13. What is every planetary body surrounded by, according to Newtonian physics?
A) A vacuum layer
B) A centrifugal barrier
C) Its own gravitational field
D) A magnetic shield
  • 14. What causes the rate of acceleration of falling objects near the Earth's surface to vary very slightly?
A) Latitude, surface features, and sub-surface densities
B) Moon phases and solar radiation
C) Wind speed and atmospheric pressure
D) Ocean tides and seasonal temperature
  • 15. Where is the force of gravity weakest on Earth?
A) At the equator
B) At the South Pole
C) At the highest mountain peak
D) At the North Pole
  • 16. What is the approximate resultant acceleration of gravity at the Equator?
A) 9.806 m/s2
B) 9.750 m/s2
C) 9.780 m/s2
D) 9.832 m/s2
  • 17. What is the approximate resultant acceleration of gravity at the poles?
A) 9.780 m/s2
B) 9.806 m/s2
C) 9.832 m/s2
D) 9.850 m/s2
  • 18. When do waves on oceans, lakes, and other bodies of water occur?
A) When lunar gravity increases suddenly
B) When the Earth stops rotating
C) When water temperature reaches boiling point
D) When gravitational equilibrium is disturbed
  • 19. What can disturb the gravitational equilibrium at the surface of water?
A) Wind
B) Earthquakes on land
C) Changes in Earth's mass
D) Solar flares
  • 20. How do planets orbit the Sun?
A) In an ellipse
B) In a straight line
C) In a parabola
D) In a perfect circle
  • 21. What objects orbit the Earth similarly to planets orbiting the Sun?
A) The Moon and artificial satellites
B) Comets and asteroids only
C) The stars and distant galaxies
D) Space dust and solar wind
  • 22. Which pair of planets has the most mutual effect on each other's orbits?
A) The oldest and densest pair
B) The hottest and fastest pair
C) The most massive and closest pair
D) The smallest and farthest pair
  • 23. What competes with gravitational attraction in a cloud of hydrogen gas during star formation?
A) Magnetic repulsion
B) Thermal gas pressure
C) Centrifugal momentum
D) Electron degeneracy pressure
  • 24. What allows additional gravitational condensation as gas density increases in a forming star?
A) The creation of a magnetic field
B) The gas radiating energy
C) The absorption of solar radiation
D) The expansion of the volume
  • 25. What does additional gravitational energy allow the central region to reach if more mass is available?
A) Complete magnetic saturation
B) Infinite electron degeneracy
C) Pressures sufficient for nuclear fusion
D) Absolute zero temperature
  • 26. What forms when nuclear fusion is reached in a star's central region?
A) A star
B) A brown dwarf
C) A black hole
D) A planet
  • 27. What state exists in a star where gravitational attraction competes with thermal and radiation pressure?
A) Gravitational collapse
B) Centrifugal balance
C) Hydrostatic equilibrium
D) Thermal instability
  • 28. When does the hydrostatic equilibrium in a star end?
A) When the star's atomic fuel runs out
B) When the star reaches maximum speed
C) When it absorbs a brown dwarf
D) When planets begin to orbit it
  • 29. What happens to very low mass stars as they age?
A) They slowly cool as white dwarf stars
B) They explode into massive supernovae
C) They immediately collapse into black holes
D) They turn into gas-giant planets
  • 30. What pressure balances gravitational attraction in white dwarf stars?
A) Electron degeneracy pressure
B) Radiation pressure
C) Thermal gas pressure
D) Neutron degeneracy pressure
  • 31. What phase do stars with masses similar to the Sun go through before becoming white dwarfs?
A) A brown dwarf phase
B) A red giant phase
C) A neutron star phase
D) A supernova phase
  • 32. What do higher mass stars ultimately produce in their complex core structures?
A) A helium shell
B) A hydrogen cloud
C) An iron core
D) A carbon ring
  • 33. What happens when higher mass stars run out of fuel?
A) They turn into gas-giant planets
B) They quietly cool into white dwarfs
C) They dissolve into thermal gas
D) They become unstable and produce a supernova
  • 34. What balances gravitational attraction in a neutron star?
A) Centrifugal force
B) Thermal gas pressure
C) Neutron degeneracy pressure
D) Electron degeneracy pressure
  • 35. What can form for even higher mass stars where gravity operates alone with extreme intensity?
A) A white dwarf
B) A red giant
C) A black hole
D) A brown dwarf
  • 36. What is unable to escape from a black hole due to the intensity of gravity?
A) Magnetic fields
B) Thermal radiation
C) Light
D) Neutron particles
  • 37. What is another term for gravity mentioned in the text?
A) Inertia
B) Centrifugal force
C) Gravitation
D) Electromagnetism
  • 38. What Latin word is the origin of the word gravity?
A) Gravitas
B) Granum
C) Gradus
D) Gravis
  • 39. What is the range of gravity?
A) Zero range
B) Infinite range
C) Limited to planetary systems
D) Subatomic range
  • 40. Who proposed the general theory of relativity in 1915?
A) Johannes Kepler
B) Galileo Galilei
C) Albert Einstein
D) Isaac Newton
  • 41. Whose law of universal gravitation sufficiently approximates gravity for most applications?
A) Galileo's
B) Kepler's
C) Newton's
D) Einstein's
  • 42. What framework are scientists looking to describe gravity within?
A) Fluid dynamics
B) Thermodynamics
C) Quantum mechanics
D) Classical mechanics
  • 43. What does gravity give to physical objects on a planetary surface?
A) Weight
B) Temperature
C) Volume
D) Charge
  • 44. Gravity is essential to understanding mechanisms responsible for surface water waves, weather patterns, and what else?
A) Auroras
B) Lunar tides
C) Solar flares
D) Earthquakes
  • 45. What biological process helps guide the growth of plants using gravitational weight?
A) Respiration
B) Gravitropism
C) Photosynthesis
D) Transpiration
  • 46. At what level can gravity generally be neglected?
A) Galaxies
B) Astronomical bodies
C) Planetary systems
D) Subatomic particles
  • 47. Which classical element did Aristotle place directly above water in concentric shells?
A) Fire
B) Air
C) Aether
D) Earth
  • 48. Which ancient thinker correctly predicted that the attraction of gravity was not unique to the Earth?
A) Plutarch
B) Vitruvius
C) Al-Khazini
D) Aristotle
  • 49. Who proposed the theory of impetus in the 6th century CE?
A) Al-Biruni
B) John Philoponus
C) Brahmagupta
D) Archimedes
  • 50. What term did Brahmagupta use to describe gravity as an attractive force?
A) aether
B) De architectura
C) impetus
D) gurutvākarṣaṇ
  • 51. In what year did the Indian mathematician Brahmagupta propose his idea about gravity?
A) 500 CE
B) 6th century CE
C) 700 CE
D) 628 CE
  • 52. Which Persian intellectual believed that other heavenly bodies should exert a gravitational attraction?
A) Aristotle
B) Al-Khazini
C) Plutarch
D) Al-Biruni
  • 53. Which scholar held the position that all matter in the Universe is attracted to the center of the Earth?
A) Brahmagupta
B) Al-Khazini
C) Archimedes
D) Al-Biruni
  • 54. Which of the following classical elements was placed in the outermost shell according to Aristotle?
A) Earth
B) Water
C) Aether
D) Fire
  • 55. Which Spanish Dominican priest wrote in 1551 that bodies in free fall uniformly accelerate?
A) Giambattista Benedetti
B) Galileo Galilei
C) Simon Stevin
D) Domingo de Soto
  • 56. Whose teachings on the fall of bodies were contradicted by experiments conducted by Italian Dominican priests?
A) Plato
B) Aristotle
C) Pythagoras
D) Socrates
  • 57. Which Italian physicist published papers claiming that objects of the same material but different masses fall at the same speed due to specific gravity?
A) Francesco Beato
B) Domingo de Soto
C) Luca Ghini
D) Giambattista Benedetti
E) Simon Stevin
  • 58. In what year was the Delft tower experiment conducted by Simon Stevin?
A) 1638
B) 1551
C) 1586
D) 1609
  • 59. What objects did Simon Stevin drop from a tower in the 1586 Delft tower experiment?
A) Wooden spheres
B) Feathers
C) Rocks
D) Cannonballs
  • 60. What method did Galileo use to establish that gravitational acceleration is the same for all objects?
A) Dropping objects from towers
B) Astronomical observations
C) Measuring pendulum oscillations
D) Rolling balls down inclines
  • 61. In what work did Galileo prove that the distance traveled by a falling object is proportional to the square of the time elapsed?
A) An Attempt to prove the Annual Motion of the Earth
B) Astronomia nova
C) Two New Sciences
D) Micrographia
  • 62. What mathematical method did Galileo use in his 1638 work since algebra and calculus were unknown to him?
A) Statistical analysis
B) Graphical numerical integration
C) Geometric proofs
D) Differential calculus
  • 63. How did Grimaldi and Riccioli calculate the magnitude of the Earth's gravity?
A) By timing balls rolling down inclines
B) By measuring pendulum oscillations
C) By dropping cannonballs from towers
D) By observing planetary motion
  • 64. Who created accurate tools for astrometry and provided careful observations of the planets in the late 16th century?
A) Giovanni Alfonso Borelli
B) Tycho Brahe
C) Robert Hooke
D) Johannes Kepler
  • 65. Who analyzed Tycho Brahe's data into three empirical laws of planetary motion?
A) Isaac Newton
B) Galileo Galilei
C) Robert Hooke
D) Johannes Kepler
  • 66. In which 1609 book did Kepler describe gravity as a mutual attraction?
A) Astronomia nova
B) Two New Sciences
C) An Attempt to prove the Annual Motion of the Earth
D) Micrographia
  • 67. Who developed the idea of mechanical equilibrium as a balance between inertia and gravity in 1666?
A) Isaac Newton
B) Johannes Kepler
C) Robert Hooke
D) Giovanni Alfonso Borelli
  • 68. Who published Micrographia in 1657 and hypothesized that the Moon must have its own gravity?
A) Robert Hooke
B) Giovanni Alfonso Borelli
C) Tycho Brahe
D) Isaac Newton
  • 69. In what year did Robert Hooke send a letter to Newton outlining a model of planetary motion due to attractive action at a distance?
A) 1679
B) 1666
C) 1686
D) 1657
  • 70. Who suggested that Newton tackle the problem of proving the inverse square relation for elliptical orbits?
A) Halley
B) Hooke
C) Bouvard
D) Wren
  • 71. What groundbreaking book did Newton publish a few years after sending his 1684 manuscript?
A) Dialogue Concerning the Two Chief World Systems
B) Opticks
C) Philosophiæ Naturalis Principia Mathematica
D) De motu corporum in gyrum
  • 72. What method did Newton use to experimentally verify the equivalence of inertial and gravitational mass?
A) Torsion balances
B) Pendulums
C) Prisms
D) Free-falling apples
  • 73. Who proposed the inverse square of distance aspect around 1640?
A) Robert Hooke
B) Ismaël Bullialdus
C) Gottfried Wilhelm Leibniz
D) Isaac Newton
  • 74. Which planet's existence was predicted in 1821 using Newton's theory of gravitation?
A) Uranus
B) Mercury
C) Neptune
D) Mars
  • 75. Whose table modeling the orbit of Uranus showed a significant discrepancy in 1821?
A) John Couch Adams
B) Alexis Bouvard
C) Urbain Le Verrier
D) Arthur Eddington
  • 76. Who eventually measured the value of the gravitational constant G in 1797?
A) Irwin I. Shapiro
B) Edmond Halley
C) Isaac Newton
D) Henry Cavendish
  • 77. Which scientist complained about Newton's theory relying on instantaneous action at a distance?
A) Gottfried Wilhelm Leibniz
B) Bernhard Riemann
C) Alexis Bouvard
D) Albert Einstein
  • 78. When did Albert Einstein develop his theory of general relativity to model Mercury's orbit?
A) 1915
B) 1959
C) 1905
D) 1684
  • 79. Who introduced the principle of relativity, which was later used as a foundational principle by Newton?
A) Gauss
B) Riemann
C) Galileo
D) Maxwell
  • 80. Who discovered that surfaces in any number of dimensions could be characterized by a metric?
A) Albert Einstein
B) Carl Gauss
C) Ismaël Bullialdus
D) Bernhard Riemann
  • 81. Who developed Carl Gauss's work into a complete geometry by 1854?
A) Alexis Bouvard
B) Isaac Newton
C) James Clerk Maxwell
D) Bernhard Riemann
  • 82. Who was able to confirm the predicted deflection of light during the 1919 solar eclipse?
A) Robert Pound
B) Arthur Eddington
C) Irwin I. Shapiro
D) Glen Rebka
  • 83. Who first identified the time delay of light passing close to a massive object in interplanetary spacecraft signals in 1964?
A) Henry Cavendish
B) Arthur Eddington
C) Irwin I. Shapiro
D) Urbain Le Verrier
  • 84. What was the name given to the first discovered black hole?
A) Neptune Prime
B) Mercury Alpha
C) Cygnus X-1
D) Gravity Probe B
  • 85. What phenomenon, meaning that a rotating massive object twists spacetime around it, was confirmed by Gravity Probe B in 2011?
A) Gravitational time dilation
B) Light deflection
C) Perihelion precession
D) Frame dragging
  • 86. When was the first indirect evidence for gravitational radiation measured?
A) 2017
B) 1993
C) 1973
D) 2015
  • 87. What was the name of the binary system used to find the first indirect evidence of gravitational radiation?
A) Betelgeuse system
B) Alpha Centauri
C) Hulse–Taylor binary
D) Sirius binary
  • 88. In what year was the Nobel Prize in Physics awarded for the research on the Hulse–Taylor binary?
A) 2017
B) 1993
C) 2015
D) 1973
  • 89. When was the first direct evidence for gravitational radiation measured?
A) 14 September 2015
B) 14 September 1973
C) 14 September 1993
D) 14 September 2017
  • 90. What detectors measured the first direct evidence of gravitational radiation?
A) LIGO detectors
B) Voyager probes
C) Keck observatory
D) Hubble telescope
  • 91. What event is mentioned as a future practical observation enabled by gravitational waves?
A) The Big Bang
B) The formation of the Moon
C) The death of the Sun
D) The collision of the Milky Way and Andromeda
  • 92. In what year was the Nobel Prize in Physics awarded for the direct measurement of gravitational waves by LIGO?
A) 2015
B) 2017
C) 1973
D) 1993
  • 93. What fraction of the total mass in the universe does dark matter consist of?
A) About 3/4
B) About 5/6
C) About 1/6
D) About 1/2
  • 94. Which interaction does dark matter NOT participate in?
A) Thermal interactions
B) Nuclear interactions
C) Gravitational interactions
D) Electromagnetic interactions
  • 95. What are clumps of dark matter known as?
A) Dark matter halos
B) Einstein rings
C) Gravitational lenses
D) Quasar mirrors
  • 96. In what year was gravitational lensing first confirmed by observation?
A) 2017
B) 1930
C) 1979
D) 1995
  • 97. In which US state is the Kitt Peak National Observatory located?
A) California
B) Arizona
C) Nevada
D) New Mexico
  • 98. What galaxy bent the light of the quasar observed in 1979?
A) LIGO Virgo
B) YGKOW G1
C) The Milky Way
D) Andromeda
  • 99. How far away was the source of the gravitational waves detected in October 2017?
A) About 130 million light-years
B) About 13 million light-years
C) About 130 billion light-years
D) About 1,300 light-years
  • 100. What anomaly involves spacecraft experiencing greater acceleration than expected during gravity assist maneuvers?
A) Pioneer anomaly
B) Lensing anomaly
C) Rotation anomaly
D) Flyby anomaly
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