Stars/Evolutions/Quiz

Stellar evolution is a lecture about a specific theory from astrophysics for the origin and accumulated changes of star systems. It is an offering from the radiation astronomy department.

You are free to take this quiz based on stellar evolution at any time.

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Quiz

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1 Yes or No, Cosmogony is any scientific theory concerning the coming into existence, or origin, of the cosmos or universe, or stars came to be.

	Yes
	No

2 Piezonuclear reactions associated with fission may include

	occurring in inert and non-radioactive elements
	high pressure
	brittle fracture
	solids under compression
	low-energy reactions
	take place in nuclei with an atomic weight ≤ iron

3 Yes or No, The formation of exponential disks is an outstanding problem in cosmogony.

	Yes
	No

4 Complete the text:

Yarkovsky–O'Keefe–Radzievskii–Paddack (YORP)

lead many objects to

and then re-accrete.

5 Chemical and physical phenomena that may be associated with core formation are

	a deficiency of some noble metals in the crust of the Earth
	leaching by metallic iron
	a liquid Earth
	a loss of mechanical energy by conversion to heat
	low viscosity
	elasticity

6 Yes or No, While fusion may be the primary mechanism by which first generation stars produce energy, repulsion between like nucleons may cause neutron emission from a collapsed core.

	Yes
	No

7 Which of the following is not a prominent feature associated with solar clouds?

	coronal mass ejections
	magnetic clouds
	rotation
	coronal clouds
	plasma
	magnetic field lines

8 True or False, In the evolution of elements much more material has gone into the even-numbered elements than into those which are odd.

	TRUE
	FALSE

9 In general there is no proper motion at all in the plage or the surrounding?

10 True or False, "Some prominences break apart and give rise to coronal mass ejections."

	TRUE
	FALSE

11 It is important to study the stellar populations of nearby galaxies in order to understand the processes of galaxy

12 Complete the text:

"When a prominence is viewed from a different perspective so that it is against the

instead of against space, it appears

than the surrounding

13 True or False, With respect to the core of the Sun, the high-hydrogen, low-iron model was suddenly adopted without opposition.

	TRUE
	FALSE

14 About one third of ejecta observed by satellites at Earth is composed of what?

15 Yes or No, A spotless flare may occur in a plage region during its first rotation.

	Yes
	No

16 Nuclear fission and nuclear fusion may be connected by which of the following?

	means for concentrating actinide elements and for separating actinide elements from reactor poisons exist
	thermonuclear fusion reactions in stars are ignited by nuclear fission energy
	dark matter
	the feasibility of thermal neutron fission and fast neutron fission in planetary and protostellar matter may be calculated from nuclear reactor theory
	brown dwarfs

17 For a few special cases, rotational velocities for protostars have been obtained directly from observations of the outer optically

regions.

18 True or False, The overdense regions having turned into dark population III objects.

	TRUE
	FALSE

19 Complete the text:

In the case of B335,

is not important in determining the

balance in the outer regions, and this object is in fact undergoing

collapse.

20 Complete the text:

Match up the likely type of star fission with each of the possibilities below:

a triple-component stellar multiple - A

massive star fission - B

semidetached binary - C

a separating close contact binary - D

ZAMS system - E

tight, circular orbit, impossible to tell eclipses - F

lobate star - G

coronal mass ejection - H

BH Centauri

Plaskett's Star (HR 2422)

Betelgeuse

W Ursae Majoris

Beta Lyrae

V1010 Ophiuchi

object is confirmed to be co-moving

Sun

21 True or False, The temperature of the cores of stars may be determined by the balance between the gravitational attraction and the gas pressure.

	TRUE
	FALSE

22 Which of the following are characteristic of a binary formed via gravitational fragmentation?

	the local Jeans length
	the local speed of sound
	the mean molecular weight
	the electron neutrino
	the mean particle density
	neutrons

23 Which of the following are likely phenomena associated with population III stars

	not enough of them
	individual masses must either be less than 0.1 M_⊙
	clouds
	in the range 10³–10⁶ Μ_⊙
	too much background light
	too much material
	heavy elements