01
True or false
1 point
At distances far from it, a black hole's gravitational pull is like that of any other object with the same mass. True or false?
Free Practice Quiz Question List
4 Black Holes Online Quiz Questions
Use this free practice quiz with 20 questions to review 4 Black Holes, test your knowledge, and prepare for your next test or exam.
20 questions
02
True or false
1 point
Images made by the Event Horizon Telescope are photographs of the event horizon itself. True or false?
- A
True
- B
False
03
Choose one
1 point
Which statement best describes the event horizon of a black hole?
- A
A region from which light can escape only if the black hole is rotating
- B
A boundary beyond which no signal can reach a distant observer
- C
A solid surface where the black hole's matter is collected
- D
A glowing layer of gas that surrounds every black hole
04
Written response
1 point
What is the event-horizon radius of an idealized nonrotating black hole called?
05
Fill in the blank
1 point
When a massive star exhausts its nuclear fuel, its collapses under gravity.
06
Choose all
1 point
Which statements accurately explain radiation from gas in an accretion disk? Select all that apply.
- A
The radiation is emitted by matter inside the event horizon.
- B
Friction and compression heat gas in the disk.
- C
The event horizon itself becomes a glowing solid surface.
- D
The heated gas can emit visible light, ultraviolet light, and X-rays.
07
True or false
1 point
Astronomers find intermediate-mass black holes straightforward to identify as a population. True or false?
- A
True
- B
False
08
Written response
1 point
For an idealized nonrotating black hole, the Schwarzschild radius is proportional to its mass. If its mass is tripled, by what factor does its Schwarzschild radius change?
09
Fill in the blank
1 point
Powerful jets are launched from the black hole's surrounding , not from inside the event horizon.
10
Choose one
1 point
When two black holes merge, what can the changing pattern of the resulting gravitational waves reveal?
- A
They show how much visible light escaped from inside each event horizon.
- B
They measure how quickly stars form in the merging galaxies.
- C
Their changing pattern reveals information about the black holes' masses and spins.
- D
They directly show the material surface of each black hole.
11
Choose all
1 point
Which are proposed pathways for forming the initial seeds of supermassive black holes? Select all that apply.
- A
Remnants of early massive stars
- B
Jets escaping from inside event horizons
- C
Direct collapse of large gas clouds
- D
The collapse of accretion disks into solid surfaces
12
Choose one
1 point
Which observation provides strong evidence for the supermassive black hole Sagittarius A*?
- A
The color of the Milky Way's most distant stars
- B
The orbits of stars near the Milky Way's center around an unseen compact mass
- C
The visible surface of a black hole at the Milky Way's center
- D
The absence of all radiation from the Milky Way's center
13
Choose one
1 point
A black hole has little or no glowing material around it. Which observation could still help reveal its presence?
- A
Light from a background object is bent by the black hole's gravity.
- B
The black hole emits visible light from inside its event horizon.
- C
A companion star's nuclear fuel is measured directly.
- D
The black hole's event horizon reflects background light like a mirror.
14
Open ended
1 point
Explain how an accreting supermassive black hole can influence its host galaxy, and describe one possible consequence for the galaxy's evolution.
15
Choose one
1 point
After a signal passes inside a black hole’s event horizon, what can happen to it?
- A
It cannot send a signal to a distant observer.
- B
It can send light outward, but not other signals.
- C
It can escape if it travels along the accretion disk.
- D
It is reflected back by the event horizon’s solid surface.
16
Written response
1 point
What is the rapidly rotating structure formed by gas falling toward a black hole called?
17
Choose one
1 point
In some binary systems, which observation can reveal a black hole pulling gas from a companion star?
- A
Detecting radio waves emitted from inside the event horizon
- B
Detecting X-rays from hot gas in an accretion disk fed by a companion star
- C
Observing sound waves that escape from the black hole
- D
Measuring visible light emitted by the black hole itself
18
Written response
1 point
What are the ripples in spacetime created when two black holes merge called?
19
Choose one
1 point
What do detectors such as LIGO measure from merging black holes?
- A
A stream of X-rays produced by a star orbiting the black holes
- B
A visible flash that must accompany every black-hole merger
- C
Ripples in spacetime produced as the black holes orbit and merge
- D
A direct measurement of light escaping from inside an event horizon
20
Choose one
1 point
What do images of a black-hole shadow show, and what do they not show?
- A
A direct photograph of the event horizon itself
- B
Radiation escaping from inside the event horizon
- C
A dark region formed only because no gas surrounds the black hole
- D
Bright emission from hot gas around a central dark shadow, not a photograph of the event horizon itself