1) The "pulsing" of a pulsar is caused by: a) Changes in its size b) Rotational alignment of radiation beams with Earth c) Fluctuations in magnetic field strength d) Orbital motion of companion stars 2) Which property of a pulsar determines the frequency of its pulses? a) Its temperature b) Its mass c) Its rotation rate d) Its magnetic field strength 3) Pulsars can rotate at speeds up to: a) A few rotations per day b) A few rotations per second c) Hundreds of rotations per second d) Hundreds of thousands of rotations per second 4) The discovery of the first pulsar was made in which year? a) 1932 b) 1945 c) 1967 d) 1974 5) The first pulsar was nicknamed "LGM-1" because it was initially thought to be: a) A gamma-ray burst b) A signal from intelligent extraterrestrial life c) A newly discovered planet d) A supernova remnant 6) Millisecond pulsars are believed to have gained their high rotation rates through: a) Gravitational collapse b) Accretion of matter from a companion star c) Spontaneous magnetic field amplification d) Nuclear fusion reactions 7) The Crab Pulsar is located in the center of which famous astronomical feature? a) The Andromeda Galaxy b) The Crab Nebula c) The Orion Nebula d) The Sagittarius A* region 8) Pulsars are useful to astronomers because they: a) Emit uniform light across all wavelengths b) Serve as highly accurate cosmic clocks c) Generate gravitational waves d) Provide fuel for spacecraft propulsion 9) The discovery of binary pulsars confirmed which major scientific prediction? a) The existence of black holes b) The speed of light is constant c) The existence of gravitational waves d) The expansion of the universe 10) A pulsar's rotational period can range from: a) Minutes to hours b) Seconds to days c) Milliseconds to seconds d) Microseconds to minutes 11) The magnetic field of a pulsar is inclined to its rotation axis, causing: a) Emission of a continuous beam of light b) Formation of pulsating radiation as seen from Earth c) Collapse into a black hole d) Slowing down of its rotation 12) Pulsars lose rotational energy over time, causing them to: a) Spin faster b) Spin slower c) Become brighter d) Emit higher-energy radiation

Senior Science - 7

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