16. When nuclear fusion ends in a star of mass greater than 3 solar masses, it f
ID: 1584527 • Letter: 1
Question
16. When nuclear fusion ends in a star of mass greater than 3 solar masses, it first becomes what before finally becoming a black hole? A) pulsar B) white dwarf C) supernova D) nebulae E) sunspot 17. The shadow of an eclipse in which the sun appears crescent is the: A) B) D) penumbra E) photosphere lunar solar C) umbra 18. The zone of the Sun just below the photosphere is called the: A) convective zone B) radiative zone C) lithosphere D) Core E) penumbra 19. After a supermova, the mass recollected is less than the Sun's mass. What is this mass alled? A) dark matter B) black dwarf C) White dwarf D) neutron starE) black hole 20. If two stars are at the same distance, how much brighter is a 3t magnitude star than a 7 magnitude? A) 4 B) 40 C) 28 D) 100 E) 16 A) 3:00 am B) 3:00 pm C) 9:00 pm At what time does one see a waning crescent moon rise? D) 9:00 am E) Noon 21. B) 8:00pm. What times it when one sees a waning gibbous moon at 60°in western sky? C) 5:00 am D) 1:00 am A) 3:00 am 22. E) 11:00 pmExplanation / Answer
16)
Answer - (A) Pulsar.
Explanation - Neutron stars are composed mainly of neutrons and are produced when a supernova explodes, forcing the protons and electrons to combine to produce a neutron star. Neutron stars are very dense. Typical stars having a mass of three times the Sun but a diameter of only 20 km. If its mass is any greater, its gravity will be so strong that it will shrink further to become a black hole. Pulsars are believed to be neutron stars that are spinning very rapidly.
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17)
Answer - B) Solar
Explanation - During a solar eclipse, moon comes in between the sun and the earth and fully blocks sunlight entering the earth. Thus sun appears crescent.
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18)
Answer - A) Convective Zone
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19)
Answer - C) White Dwarf
Explanation - As the dying mass is less than that of sun, so it would be a white dwarf.
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