# Gravitation: Quiz

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More interesting facts on Gravitation

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Question 1: ________, which would interact gravitationally but not electromagnetically, would account for the discrepancy.
Big BangUniverseDark matterPhysical cosmology

Question 2: In general relativity, the effects of gravitation are ascribed to spacetime ________ instead of a force.
CurvatureFrenet–Serret formulasGaussian curvaturePrincipal curvature

Question 3: For charges with a geometrized length which are less than the geometrized length of the mass of the object, this solution produces black holes with two ________.
Kerr metricEvent horizonSchwarzschild metricGeneral relativity

Question 4: The starting point for general relativity is the ________, which equates free fall with inertial motion, and describes free-falling inertial objects as being accelerated relative to non-inertial observers on the ground.
GravitationIntroduction to general relativityGravitational waveEquivalence principle

Question 5: Many believe the complete theory to be string theory,[20] or more currently ________, and, on the other hand, it may be a background independent theory such as loop quantum gravity or causal dynamical triangulation.
Superstring theoryIntroduction to M-theoryD-braneM-theory

Question 6: Gravitation causes dispersed matter to coalesce, thus accounting for the existence of the ________, the Sun, and most of the macroscopic objects in the universe.
MarsMoonEarthNature

Question 7: The prediction that time runs slower at lower potentials has been confirmed by the Pound–Rebka experiment, the Hafele–Keating experiment, and the ________.
F-15 EagleGlobal Positioning SystemCompassInertial navigation system

Question 8: For compact enough objects, this solution generated a ________ with a central singularity.
Kerr–Newman metricBlack holeKerr metricSchwarzschild metric

Question 9: The ________ are a set of 10 simultaneous, non-linear, differential equations.
GravitationEinstein field equationsGeneral relativityIntroduction to general relativity

Question 10: Accelerating expansion: The ________ seems to be speeding up.
Metric expansion of spaceBig BangUniverseHubble's law