01
Choose one
1 point
A clump of gas in a molecular cloud contracts and heats up, but hydrogen fusion has not yet begun in its core. What stage has it reached?
Free Practice Quiz Question List
2 Stars and Stellar Evolution Online Quiz Questions
Use this free practice quiz with 20 questions to review 2 Stars and Stellar Evolution, test your knowledge, and prepare for your next test or exam.
20 questions
02
Choose one
1 point
During most of a star's life, what physical balance keeps it from continuing to collapse under its own gravity?
- A
Gravity pulls inward while pressure from hot gas and outward-flowing energy resists compression.
- B
Gravity pushes outward while pressure from hot gas pulls the star inward.
- C
The star's magnetic field balances the gravitational pull of nearby stars.
- D
Radiation escapes the star, so gravity no longer acts on its material.
03
Choose one
1 point
Which description best traces the energy produced by a star's core?
- A
Energy made in the core stays there until the star becomes a remnant.
- B
Energy flows inward from space and is converted into gravity in the core.
- C
Energy made in the core travels outward and is eventually radiated into space.
- D
Energy is produced only in the outer layers and moves toward the core.
04
Choose all
1 point
Select all statements that accurately describe neutron stars or black holes.
- A
A neutron star's matter is compressed mainly into neutrons and is supported by quantum and nuclear forces.
- B
A neutron star is supported against collapse by electron degeneracy pressure.
- C
Within a black hole's event horizon, not even light can escape.
- D
A black hole is a remnant whose event horizon lets light escape but traps matter.
05
True or false
1 point
A more massive star generally uses its fuel faster and has a shorter life than a less massive star.
- A
True
- B
False
06
True or false
1 point
In a sufficiently massive star, building a core up to iron does not mean fusion can continue providing the energy needed to support the core.
- A
True
- B
False
07
Written response
1 point
For most of its life, a star fuses hydrogen into helium in its core during which stellar phase?
08
Written response
1 point
What is the compact stellar remnant supported against further collapse by electron degeneracy pressure?
09
Fill in the blank
1 point
Stars begin in cold, dense regions of gas and dust called .
10
Fill in the blank
1 point
The expanding gas shed by a lower- or intermediate-mass star may form a glowing .
11
Choose one
1 point
Astronomers separate a star's light into component wavelengths. Which properties can this spectrum help them determine?
- A
It reveals only the star's distance and the number of planets it has.
- B
It can reveal the star's temperature and elements in its outer layers.
- C
It directly measures the star's core pressure and remaining fuel supply.
- D
It shows only how much dust surrounds the star, not properties of the star itself.
12
Open ended
1 point
Explain how a star's mass affects its later evolution. Contrast the path of a star like the Sun with the path of a massive star, including how their cores and outer layers change and what remnants they may leave.
13
True or false
1 point
True or false: If outward pressure in a star weakens while gravity continues to pull inward, the star's material tends to contract because hydrostatic equilibrium has been disrupted.
- A
True
- B
False
14
Choose one
1 point
A contracting clump in a molecular cloud has become a protostar. Which change marks its transition into a star?
- A
Its surrounding gas and dust have all dispersed.
- B
Hydrogen fusion into helium begins in its core.
- C
It has formed a planetary nebula.
- D
Its core has collapsed into a neutron star.
15
Choose one
1 point
An astronomer wants to investigate a star's temperature and the elements present in its outer layers. Which observation is most useful?
- A
The star's exact age and the mass of every planet orbiting it.
- B
The star's distance and the number of planets in its galaxy.
- C
The star's temperature and elements in its outer layers.
- D
The star's future remnant with certainty.
16
Written response
1 point
What is the compact hot core left after a Sun-like star sheds its outer layers called?
17
Choose one
1 point
Two stars differ mainly in mass, and one is much more massive. Which prediction about their lifetimes is best supported?
- A
The more massive star generally has a shorter life because it consumes fuel faster.
- B
The more massive star generally has a longer life because it contains more fuel.
- C
Both stars have the same lifespan because they fuse the same element.
- D
The less massive star generally has a shorter life because its core is cooler.
18
Written response
1 point
What is the name for the glowing cloud that may form from gas expelled by a low- or intermediate-mass star?
19
Choose one
1 point
Which description best fits the fusion capabilities of a star like the Sun during its later evolution?
- A
It can fuse iron to release the energy needed to support its core.
- B
It cannot fuse any element heavier than hydrogen.
- C
It can sustain every fusion stage up to iron.
- D
It can fuse helium into heavier nuclei such as carbon and oxygen, but not sustain the full fusion sequence of the most massive stars.
20
Choose all
1 point
A cloud contains material returned to space by earlier generations of stars. Which statements accurately describe how stars can contribute to this cloud and to later cosmic objects? Select all correct choices.
- A
Fusion in stars creates many elements heavier than hydrogen and helium.
- B
Stellar winds and explosive deaths release material into surrounding space.
- C
All elements heavier than hydrogen and helium are made only after planets form.
- D
Enriched gas released by stars can later become part of new stars and planets.
- E
Material expelled by stars cannot affect later generations of cosmic objects.