Expansion of the universe - Quiz
A) As an optical illusion caused by the movement of the Milky Way B) As resulting from an initial condition in which contents are flying apart C) As a contraction phase that has reversed into expansion D) As a purely random quantum fluctuation without a starting condition
A) It accelerates the expansion indefinitely B) It causes the universe to immediately begin contracting C) It has no effect on the scale factor D) It gradually slows the expansion over time
A) Their density is too low B) Their gravitational constant is negative C) They disappear over time D) They are countered by the speed of light
A) Nonrelativistic matter B) Dark energy C) The cosmological constant alone without dark energy D) Ultrarelativistic particles
A) The pressure of dark energy B) The total mass of the universe C) The average separation between objects like galaxies D) The speed of light in a vacuum
A) It is larger B) It is exactly the same C) It was infinite D) It is smaller
A) It remains constant at 1 B) It is smaller C) It is always zero D) It is larger
A) 20.000 ± 0.050 billion years ago B) 13.787 ± 0.020 billion years ago C) 10.500 ± 0.100 billion years ago D) 5.250 ± 0.010 billion years ago
A) Zero B) Negative one C) One D) Infinity
A) The universe reaching zero temperature B) The universe maintaining a static size C) The universe stopping expansion and beginning to contract D) The universe expanding at an infinite speed
A) Kerr metric B) FLRW metric C) Minkowski metric D) Schwarzschild metric
A) Schrödinger equations B) Maxwell equations C) Navier-Stokes equations D) Friedmann equations
A) How quantum particles decay into dark matter B) The geometric curvature of a static universe C) How the contents of the universe influence its expansion rate D) The exact temperature of the cosmic microwave background
A) Gravitational constant B) Speed of light C) Cosmological constant D) Energy density
A) Scale factor derivative B) Energy density within the universe C) Pressure of the cosmic fluid D) Gravitational potential
A) Period B) Density C) Parallax D) Pressure
A) Curvature parameter B) Cosmic constant C) Speed of light D) Compression factor
A) Deceleration limit B) Cosmological constant C) Wavelength of radiation D) Lambda baryon mass
A) Immediate contraction of the universe B) No effect on acceleration C) Infinite acceleration D) Deceleration of the expansion
A) It stabilizes the scale factor B) It accelerates expansion C) It neutralizes gravity completely D) It further decelerates expansion
A) Infinite positive pressure B) Positive pressure equal to ρc²/3 C) Sufficiently negative pressure with p < -ρc²/3 D) Zero pressure like nonrelativistic matter
A) Photon gas density B) Ultrarelativistic particle gas C) The cosmological constant D) Nonrelativistic matter
A) It equals the speed of light squared B) It is essentially pressureless C) It has extreme negative pressure D) It has extreme positive pressure
A) Pressure is exactly equal to ρc² B) Pressure is negative and exceeds ρc² C) Absolute pressure is much less than ρc² D) Pressure is greater than ρc²
A) Dark matter gas B) Neutron gas C) Hydrogen gas D) Photon gas
A) p = 0 B) p = -ρc²/3 C) p = ρc²/3 D) p = -ρc²
A) Only in laboratory settings B) No C) Yes, through direct particle accelerators D) Yes
A) From astronomical observations B) From the laws of thermodynamics in a closed box C) From quantum mechanical calculations alone D) From direct laboratory synthesis
A) ä = 1 B) ä = 0 C) ä > 0 D) ä < 0
A) Hubble's law B) Einstein's theory C) Kepler's law D) Newton's law
A) The same in all directions B) Composed of a single element C) Constantly changing D) The same everywhere
A) Chaotically B) Logarithmically C) Asymmetrically D) Uniformly
A) Exponential relationship B) Inverse relationship C) Linear relationship D) Quadratic relationship
A) Positions B) Time intervals C) Temperatures D) Accelerations
A) t0 B) x0 C) v0 D) H0
A) The inflation model B) The Friedmann-Lemaître model C) The Lambda-CDM model D) The Big Bang metric
A) Dark energy acceleration B) Late-time acceleration C) Redshifting D) Inflation
A) Alexander Friedmann B) Knut Lundmark C) Vesto Slipher D) Edwin Hubble
A) Knut Lundmark B) David Spergel C) Walter Baade D) Adam Riess
A) Knut Lundmark B) Edwin Hubble C) Vesto Slipher D) Georges Lemaître
A) David Spergel B) Wendy Freedman C) Walter Baade D) Edwin Hubble
A) Adam Riess's B) David Spergel's C) Knut Lundmark's D) Wendy Freedman's
A) 80±17 km⋅s-1⋅Mpc-1 B) 73±7 km⋅s-1⋅Mpc-1 C) 67±7 km⋅s-1⋅Mpc-1 D) 72±5 km⋅s-1⋅Mpc-1
A) Galaxy diameter measurements B) Cepheid variable calibrations C) Visual-band light-curve shapes D) Cosmic microwave background analysis
A) 80±17 km⋅s-1⋅Mpc-1 B) 73±7 km⋅s-1⋅Mpc-1 C) 72±5 km⋅s-1⋅Mpc-1 D) 67±7 km⋅s-1⋅Mpc-1
A) 50 to 90 km⋅s-1⋅Mpc-1 B) 80±17 km⋅s-1⋅Mpc-1 C) 67±7 km⋅s-1⋅Mpc-1 D) 73±7 km⋅s-1⋅Mpc-1
A) David Spergel's B) Adam Riess's C) Wendy Freedman's D) Alexander Friedmann's
A) Hubble Space Telescope B) Slipher Explorer C) Lemaître Space Observatory D) Wilkinson Microwave Anisotropy Probe satellite (WMAP)
A) 67±7 km⋅s-1⋅Mpc-1 B) 80±17 km⋅s-1⋅Mpc-1 C) 72±5 km⋅s-1⋅Mpc-1 D) 73±7 km⋅s-1⋅Mpc-1
A) Relativistic coordinates B) Cartesian coordinates C) Spherical coordinates D) Comoving coordinates
A) Four-dimensional spacetime B) Infinite-dimensional spacetime C) Five-dimensional spacetime D) Three-dimensional spacetime
A) One-dimensional linear curves B) Three-dimensional spatial surfaces C) Four-dimensional temporal surfaces D) Two-dimensional flat planes
A) Hyperboloids B) Spheres C) Cylinders D) Tori
A) Thermal radiation B) Electromagnetism C) Dark matter density alone D) Gravity
A) Closed spheres B) Irregularly curved C) Open hyperboloids D) Geometrically flat
A) 180 degrees B) 270 degrees C) 90 degrees D) 360 degrees
A) Zero age B) Infinite age C) Finite age D) Cyclical age
A) Cosmic horizon B) Event horizon C) Hubble horizon D) Particle horizon
A) A cosmic event horizon induced by repulsive gravity B) Because stars burn out too quickly C) Because light travels infinitely slowly D) Due to excessive magnetic fields
A) Particle horizon B) Planck scale C) Event horizon D) Hubble horizon
A) Thermal expansion B) Photon decay C) The Doppler effect D) Gravitational lensing
A) They dilute B) They concentrate C) They multiply D) They annihilate
A) w B) rho C) a D) p
A) Negative one B) Negative three C) One-third D) Zero
A) Around 10−32 seconds B) At the very end of the universe C) Around 1026 seconds D) Around 1 second
A) The inflaton B) Neutrino decoupling C) Magnetic monopoles D) Ultrarelativistic particles
A) A negative-energy true vacuum state B) A zero-energy stable vacuum state C) A positive-energy false vacuum state D) A fluctuating thermal vacuum state
A) Inflaton fields B) Magnetic monopoles C) Standard Model particles D) Cosmic scale factors
A) Neutrino decoupling B) Quantum fluctuations C) Thermal radiation D) Magnetic monopoles
A) About 1032 B) About 1026 C) About 1060 D) About 1
A) Radiation B) Quantum fluctuations C) Inflation D) The horizon
A) About e60 seconds B) About 10−32 seconds C) About 1 second D) About 1026 seconds
A) Dark energy B) Cosmic microwave background C) Neutron stars D) Nonrelativistic matter
A) Matter-dominated epoch B) Dark energy epoch C) Inflationary epoch D) Radiation era
A) Through time-delay cosmography B) Using its apparent brightness C) Through the redshift D) By measuring gravitational lensing angles
A) Cepheid variable stars B) Type Ia supernovae C) Lensed quasars D) Neutron stars
A) Cepheid variable photometry B) Redshift drift analysis C) CMB fluctuation sizing D) Time-delay cosmography
A) TDCOSMO cluster B) Planck foreground cluster C) H0LiCOW cluster D) MACS J0138-2155
A) GW170817 B) MACS J0138-2155 C) SN Refsdal D) SN Requiem
A) CMB fluctuation sizes B) Standard candle brightness C) Redshift drift D) Gravitational lensing time delays
A) Planck collaboration satellites B) H0LiCOW and TDCOSMO space probes C) Square Kilometre Array or Extremely Large Telescope D) Cepheid variable telescopes from Hubble's era
A) A static spacetime B) A universal center C) A preferred rest frame D) An infinite Euclidean universe
A) Only in flat spacetimes B) Yes C) No D) Only on small scales
A) General relativity B) Quantum mechanics C) Electromagnetism D) Special relativity
A) Charles H. Lineweaver B) Andrew R. Liddle C) Arthur Eddington D) Delo E. Mook
A) Scientific American B) Press Syndicate of the University of Cambridge C) Princeton University Press D) Cambridge University Press
A) March 1991 B) March 2005 C) March 2000 D) March 1931
A) Andrew R. Liddle B) Thomas Vargish C) Tamara M. Davis D) David H. Lyth |
Created with That Quiz —
where a math practice test is always one click away.