What is the primary fuel for a star during its main sequence phase?
a) Oxygen
b) Helium
c) Hydrogen
d) Carbon
What is the term for the process where a star fuses hydrogen into helium?
a) Nuclear fission
b) Stellar fusion
c) Thermonuclear reaction
d) Gravitational collapse
What happens to a star when it runs out of hydrogen fuel in its core?
a) It becomes a white dwarf
b) It explodes as a supernova
c) It expands into a red giant or supergiant
d) It contracts into a neutron star
What is a white dwarf?
a) A star at the beginning of its life cycle
b) The core remnant of a star that has shed its outer layers
c) A massive star undergoing fusion
d) A cloud of gas and dust
Which element does a star primarily fuse during the red giant phase?
a) Carbon
b) Oxygen
c) Helium
d) Nitrogen
What is the fate of a massive star after it explodes in a supernova?
a) It becomes a black hole or neutron star
b) It becomes a white dwarf
c) It becomes a red giant
d) It remains as a gas cloud
What type of star is formed when a star like our Sun exhausts its fuel?
a) Black hole
b) Neutron star
c) White dwarf
d) Supernova
What is the primary energy source for a star in the main sequence phase?
a) Hydrogen fusion
b) Gravitational contraction
c) Helium fusion
d) Chemical reactions
What is the last stage in the life cycle of a low-mass star?
a) Neutron star
b) Red giant
c) White dwarf
d) Supernova
What causes a star to begin its transformation into a red giant?
a) The depletion of hydrogen in the core
b) An increase in hydrogen fusion
c) A decrease in its gravitational force
d) The accumulation of helium in the core
Which phase in a star’s life cycle comes after the main sequence?
a) Red giant or supergiant phase
b) White dwarf phase
c) Protostar phase
d) Black hole phase
What is the primary characteristic of a supernova explosion?
a) A star suddenly cools down
b) The star’s core collapses, causing an enormous release of energy
c) A new star is formed from the explosion
d) The star disappears without any visible changes
What type of star ends its life as a neutron star or black hole?
a) Low-mass stars
b) Intermediate-mass stars
c) High-mass stars
d) All types of stars
What happens during the red giant phase of a star’s life cycle?
a) The star contracts and cools
b) The star expands and becomes cooler
c) The star fuses helium into heavier elements
d) The star undergoes a supernova explosion
How does a star like the Sun eventually end its life?
a) As a black hole
b) By expanding into a red giant and then shedding its outer layers to form a white dwarf
c) By collapsing into a neutron star
d) By exploding as a supernova
What is the first stage in the life cycle of a star?
a) Supernova
b) White dwarf
c) Protostar
d) Main sequence
What is the final stage of a very massive star’s life cycle?
a) Red giant
b) Neutron star or black hole
c) White dwarf
d) Planetary nebula
What causes a star to leave the main sequence?
a) Depletion of hydrogen in the core
b) Overheating of the surface
c) The creation of too much helium
d) The formation of a black hole
What is the term for the outer layers of a star that are expelled during the red giant phase?
a) Nebula
b) Solar wind
c) Supernova remnant
d) Planetary nebula
What is the main characteristic of a black hole formed from a massive star?
a) It has no mass
b) It has infinite density and strong gravitational pull
c) It radiates large amounts of light
d) It is made of dark matter
Which element is primarily created during the later stages of a massive star’s life cycle?
a) Oxygen
b) Carbon
c) Helium
d) Iron
What is the process called when a star explodes at the end of its life cycle?
a) Supernova
b) Nova
c) Stellar collapse
d) Stellar fusion
What is the fate of a star with a mass less than 8 times that of the Sun?
a) It becomes a white dwarf
b) It forms a black hole
c) It becomes a neutron star
d) It undergoes a supernova explosion
What causes a supernova explosion?
a) The star’s core collapsing under its own gravity
b) The star’s surface expanding rapidly
c) The fusion of hydrogen into helium
d) The loss of mass due to solar wind
What type of star is formed from the remnants of a supernova explosion?
a) Neutron star or black hole
b) White dwarf
c) Protostar
d) Red giant
What is the primary factor determining the life cycle of a star?
a) Its mass
b) Its size
c) Its composition
d) Its temperature
What happens to a star in the main sequence phase when it runs out of hydrogen in its core?
a) It collapses into a neutron star
b) It enters the red giant phase
c) It becomes a white dwarf
d) It forms a black hole
Which of the following is NOT a phase in the life cycle of a star?
a) Main sequence
b) Protostar
c) Red giant
d) Black hole phase
What happens to the outer layers of a star during a supernova explosion?
a) They collapse into a black hole
b) They are ejected into space
c) They shrink into a white dwarf
d) They become part of the neutron star
How long does the main sequence phase typically last for a star like our Sun?
a) 1 million years
b) 5 billion years
c) 10 billion years
d) 100 billion years
