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