Universe Questions and Answers

Correct Answer: Option D — Light-year. Light-year is correct because it is approximately 9.46 trillion kilometres. It is also associated with a unit of distance. Together, these two facts identify Light-year precisely within Universe. Why the other options are incorrect: Option A — Milky Way: Milky Way is it belongs to the Local Group. It is also associated with a barred spiral galaxy, so these facts identify Milky Way rather than Light-year. Option B — Andromeda Galaxy: Andromeda Galaxy is it belongs to the Local Group. It is also associated with a spiral galaxy also catalogued as M31, so these facts identify Andromeda Galaxy rather than Light-year. Option C — Sun: Sun is sunlight reaches Earth in about 8 minutes 20 seconds. It is also associated with a G-type main-sequence star, so these facts identify Sun rather than Light-year. Exam Takeaway: Link Light-year with “approximately 9.46 trillion kilometres” and “a unit of distance” for quick revision.

Correct Answer: Option C — Light-year. Light-year is correct because it is the distance light travels in one year. It is also associated with approximately 9.46 trillion kilometres. Together, these two facts identify Light-year precisely within Universe. Why the other options are incorrect: Option A — Milky Way: Milky Way is Sagittarius A* lies at its centre. It is also associated with it belongs to the Local Group, so these facts identify Milky Way rather than Light-year. Option B — Andromeda Galaxy: Andromeda Galaxy is it is visible from Earth without a telescope under dark skies. It is also associated with it belongs to the Local Group, so these facts identify Andromeda Galaxy rather than Light-year. Option D — Sun: Sun is the photosphere is its visible surface. It is also associated with sunlight reaches Earth in about 8 minutes 20 seconds, so these facts identify Sun rather than Light-year. Exam Takeaway: Link Light-year with “the distance light travels in one year” and “approximately 9.46 trillion kilometres” for quick revision.

Correct Answer: Option B — Light-year. Light-year is correct because it is used for distances between stars and galaxies. It is also associated with the distance light travels in one year. Together, these two facts identify Light-year precisely within Universe. Why the other options are incorrect: Option A — Milky Way: Milky Way is the galaxy containing the Solar System. It is also associated with Sagittarius A* lies at its centre, so these facts identify Milky Way rather than Light-year. Option C — Andromeda Galaxy: Andromeda Galaxy is the nearest large galaxy to the Milky Way. It is also associated with it is visible from Earth without a telescope under dark skies, so these facts identify Andromeda Galaxy rather than Light-year. Option D — Sun: Sun is the star at the centre of the Solar System. It is also associated with the photosphere is its visible surface, so these facts identify Sun rather than Light-year. Exam Takeaway: Link Light-year with “used for distances between stars and galaxies” and “the distance light travels in one year” for quick revision.

Correct Answer: Option A — Light-year. Light-year is correct because it is a unit of distance. It is also associated with used for distances between stars and galaxies. Together, these two facts identify Light-year precisely within Universe. Why the other options are incorrect: Option B — Milky Way: Milky Way is a barred spiral galaxy. It is also associated with the galaxy containing the Solar System, so these facts identify Milky Way rather than Light-year. Option C — Andromeda Galaxy: Andromeda Galaxy is a spiral galaxy also catalogued as M31. It is also associated with the nearest large galaxy to the Milky Way, so these facts identify Andromeda Galaxy rather than Light-year. Option D — Sun: Sun is a G-type main-sequence star. It is also associated with the star at the centre of the Solar System, so these facts identify Sun rather than Light-year. Exam Takeaway: Link Light-year with “a unit of distance” and “used for distances between stars and galaxies” for quick revision.

Correct Answer: Option D — Black hole. Black hole is correct because it is its gravity strongly bends spacetime. It is also associated with a region where escape velocity exceeds the speed of light. Together, these two facts identify Black hole precisely within Universe. Why the other options are incorrect: Option A — Light-year: Light-year is approximately 9.46 trillion kilometres. It is also associated with a unit of distance, so these facts identify Light-year rather than Black hole. Option B — Milky Way: Milky Way is it belongs to the Local Group. It is also associated with a barred spiral galaxy, so these facts identify Milky Way rather than Black hole. Option C — Andromeda Galaxy: Andromeda Galaxy is it belongs to the Local Group. It is also associated with a spiral galaxy also catalogued as M31, so these facts identify Andromeda Galaxy rather than Black hole. Exam Takeaway: Link Black hole with “its gravity strongly bends spacetime” and “a region where escape velocity exceeds the speed of light” for quick revision.

Correct Answer: Option C — Black hole. Black hole is correct because it is its boundary is called the event horizon. It is also associated with its gravity strongly bends spacetime. Together, these two facts identify Black hole precisely within Universe. Why the other options are incorrect: Option A — Light-year: Light-year is the distance light travels in one year. It is also associated with approximately 9.46 trillion kilometres, so these facts identify Light-year rather than Black hole. Option B — Milky Way: Milky Way is Sagittarius A* lies at its centre. It is also associated with it belongs to the Local Group, so these facts identify Milky Way rather than Black hole. Option D — Andromeda Galaxy: Andromeda Galaxy is it is visible from Earth without a telescope under dark skies. It is also associated with it belongs to the Local Group, so these facts identify Andromeda Galaxy rather than Black hole. Exam Takeaway: Link Black hole with “its boundary is called the event horizon” and “its gravity strongly bends spacetime” for quick revision.

Correct Answer: Option B — Black hole. Black hole is correct because it is often formed from the collapse of a massive star. It is also associated with its boundary is called the event horizon. Together, these two facts identify Black hole precisely within Universe. Why the other options are incorrect: Option A — Light-year: Light-year is used for distances between stars and galaxies. It is also associated with the distance light travels in one year, so these facts identify Light-year rather than Black hole. Option C — Milky Way: Milky Way is the galaxy containing the Solar System. It is also associated with Sagittarius A* lies at its centre, so these facts identify Milky Way rather than Black hole. Option D — Andromeda Galaxy: Andromeda Galaxy is the nearest large galaxy to the Milky Way. It is also associated with it is visible from Earth without a telescope under dark skies, so these facts identify Andromeda Galaxy rather than Black hole. Exam Takeaway: Link Black hole with “often formed from the collapse of a massive star” and “its boundary is called the event horizon” for quick revision.

Correct Answer: Option A — Black hole. Black hole is correct because it is a region where escape velocity exceeds the speed of light. It is also associated with often formed from the collapse of a massive star. Together, these two facts identify Black hole precisely within Universe. Why the other options are incorrect: Option B — Light-year: Light-year is a unit of distance. It is also associated with used for distances between stars and galaxies, so these facts identify Light-year rather than Black hole. Option C — Milky Way: Milky Way is a barred spiral galaxy. It is also associated with the galaxy containing the Solar System, so these facts identify Milky Way rather than Black hole. Option D — Andromeda Galaxy: Andromeda Galaxy is a spiral galaxy also catalogued as M31. It is also associated with the nearest large galaxy to the Milky Way, so these facts identify Andromeda Galaxy rather than Black hole. Exam Takeaway: Link Black hole with “a region where escape velocity exceeds the speed of light” and “often formed from the collapse of a massive star” for quick revision.

Correct Answer: Option D — Crab Nebula. Crab Nebula is correct because it is it contains the Crab Pulsar. It is also associated with a supernova remnant. Together, these two facts identify Crab Nebula precisely within Universe. Why the other options are incorrect: Option A — Black hole: Black hole is its gravity strongly bends spacetime. It is also associated with a region where escape velocity exceeds the speed of light, so these facts identify Black hole rather than Crab Nebula. Option B — Light-year: Light-year is approximately 9.46 trillion kilometres. It is also associated with a unit of distance, so these facts identify Light-year rather than Crab Nebula. Option C — Milky Way: Milky Way is it belongs to the Local Group. It is also associated with a barred spiral galaxy, so these facts identify Milky Way rather than Crab Nebula. Exam Takeaway: Link Crab Nebula with “it contains the Crab Pulsar” and “a supernova remnant” for quick revision.

Correct Answer: Option C — Crab Nebula. Crab Nebula is correct because it is associated with a supernova observed in 1054 CE. It is also associated with it contains the Crab Pulsar. Together, these two facts identify Crab Nebula precisely within Universe. Why the other options are incorrect: Option A — Black hole: Black hole is its boundary is called the event horizon. It is also associated with its gravity strongly bends spacetime, so these facts identify Black hole rather than Crab Nebula. Option B — Light-year: Light-year is the distance light travels in one year. It is also associated with approximately 9.46 trillion kilometres, so these facts identify Light-year rather than Crab Nebula. Option D — Milky Way: Milky Way is Sagittarius A* lies at its centre. It is also associated with it belongs to the Local Group, so these facts identify Milky Way rather than Crab Nebula. Exam Takeaway: Link Crab Nebula with “associated with a supernova observed in 1054 CE” and “it contains the Crab Pulsar” for quick revision.