Asteroids Practice Questions
20 free Asteroids practice questions for the Static GK. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Which region of the Solar System contains the vast majority of known asteroids?
- A The Kuiper Belt
- B The Oort Cloud
- C The Trojan Clouds
- D The Asteroid Belt
Correct answer: The Asteroid Belt
The Main Asteroid Belt is located in the vast gap between the orbits of Mars and Jupiter. It contains millions of rocky bodies ranging in size from dust particles to dwarf planets.
Which was the first asteroid ever discovered, found by Giuseppe Piazzi in 1801?
- A Vesta
- B Pallas
- C Hygiea
- D Ceres
Correct answer: Ceres
Ceres was discovered on January 1, 1801, and was originally considered a planet. Today, it is classified as both the largest asteroid in the main belt and a dwarf planet.
What is the most common composition type for asteroids, making up about 75% of known celestial rocks?
- A S-type (Silicaceous)
- B M-type (Metallic)
- C V-type (Vestoid)
- D C-type (Carbon-Rich)
Correct answer: C-type (Carbon-Rich)
C-type or carbonaceous asteroids are very dark and are thought to be among the most ancient objects in the solar system. They are rich in carbon and are common in the outer regions of the main belt.
The 'Trojan' asteroids share an orbit with which planet?
- A Jupiter
- B Mars
- C Saturn
- D Neptune
Correct answer: Jupiter
Trojan asteroids are groups of asteroids that share Jupiter's orbit around the Sun. They are trapped in the stable Lagrange points ($L_4$ and $L_5$) located 60 degrees ahead of and behind the planet.
Which NASA mission was the first to successfully land a spacecraft on the surface of an asteroid (Eros) in 2001?
- A OSIRIS-REx
- B NEAR Shoemaker
- C Dawn (Vesta and Ceres)
- D Lucy
Correct answer: NEAR Shoemaker
The Near Earth Asteroid Rendezvous (NEAR) Shoemaker mission landed on the asteroid 433 Eros on February 12, 2001. It was the first time a human-made craft touched down on an asteroid's surface.
What is the name of the largest asteroid in the main belt that is NOT classified as a dwarf planet?
- A Pallas
- B Juno
- C Vesta
- D Interamnia
Correct answer: Vesta
Vesta is the second-most-massive object in the asteroid belt after Ceres. Unlike Ceres, it is not spherical enough to be called a dwarf planet, but it is the brightest asteroid visible from Earth.
Which term is used for asteroids that have orbits that bring them into close proximity with Earth?
- A Centaurs
- B Near-Earth Objects
- C Kuiper Belt Objects
- D Meteoroids
Correct answer: Near-Earth Objects
Near-Earth Objects (NEOs) are asteroids or comets whose orbits bring them within 1.3 astronomical units of the Sun. NASA and other agencies track these objects to assess potential impact risks.
The 'Kirkwood Gaps' found within the asteroid belt are caused by the gravitational influence of which planet?
- A Mars
- B Earth
- C Jupiter
- D Saturn (gas giant)
Correct answer: Jupiter
Kirkwood Gaps are regions in the asteroid belt where relatively few asteroids are found. They correspond to orbital resonances with Jupiter, where the planet's gravity pulls asteroids out of those specific orbits.
Which asteroid was the target of the DART mission, which successfully tested 'kinetic impact' to change an asteroid's trajectory in 2022?
- A Bennu
- B Ryugu
- C Dimorphos
- D Itokawa (Hayabusa)
Correct answer: Dimorphos
The Double Asteroid Redirection Test (DART) crashed a spacecraft into Dimorphos, the small moon of the asteroid Didymos. The mission successfully altered the orbital period of the moonlet.
What is the name of the asteroid from which the OSIRIS-REx mission collected and returned samples to Earth in 2023?
- A Bennu
- B Ryugu
- C Psyche
- D Apophis
Correct answer: Bennu
NASA's OSIRIS-REx mission spent years studying the carbon-rich asteroid Bennu. It successfully returned a sample capsule to Earth on September 24, 2023, containing rocks and dust from the asteroid.
Which of these describes 'M-type' asteroids?
- A Mostly composed of frozen water
- B Rich in metallic nickel and iron
- C Composed primarily of clay and silicate rocks
- D Extinct comet nuclei
Correct answer: Rich in metallic nickel and iron
M-type (metallic) asteroids are primarily composed of nickel-iron. Many are thought to be the fragments of the metallic cores of larger protoplanets that were shattered by collisions.
What is the primary difference between an asteroid and a comet?
- A Overall size
- B Orbital speed and path
- C Composition (Rock vs. Ice)
- D Average distance from the Sun
Correct answer: Composition (Rock vs. Ice)
Asteroids are mainly composed of mineral and rock, whereas comets are composed of dust, ice, and frozen gases. This is why comets develop visible comas and tails when they approach the Sun.
Which asteroid is highly valued for scientific study because it appears to be the exposed nickel-iron core of an early planet?
- A 16 Psyche
- B 253 Mathilde
- C 951 Gaspra
- D 243 Ida
Correct answer: 16 Psyche
16 Psyche is a unique metal-rich asteroid located in the main belt. NASA launched a mission in 2023 to visit Psyche and investigate the origins of planetary cores.
The asteroid 'Dactyl' is famous in astronomy because it was the first asteroid found to have what?
- A An atmosphere
- B Liquid water
- C Its own moon
- D A ring system
Correct answer: Its own moon
During the Galileo spacecraft's flyby of asteroid 243 Ida in 1993, it discovered a tiny moon named Dactyl. This was the first definitive proof that asteroids could have their own natural satellites.
Which group of asteroids cross the Earth's orbit and spend most of their time outside Earth's orbit?
- A Atira asteroids
- B Atens
- C Apollos
- D Amor asteroids
Correct answer: Apollos
Apollo asteroids are a group of near-Earth asteroids named after 1862 Apollo. They have orbital semi-major axes larger than Earth's but perihelion distances less than Earth's aphelion distance.
What happens when a small piece of an asteroid survives its trip through Earth's atmosphere and hits the ground?
- A Meteor
- B Meteorite
- C Meteoroid
- D Bolide
Correct answer: Meteorite
The object is a meteoroid while in space and a meteor while burning up in the atmosphere. Only if a fragment survives the friction and lands on the surface is it called a meteorite.
What is the name of the effect where sunlight causes an asteroid to slowly change its rotation and orbit over time?
- A Photoelectric Effect
- B Yarkovsky Effect
- C Tyndall Effect
- D Coriolis Effect
Correct answer: Yarkovsky Effect
The Yarkovsky effect occurs when an asteroid absorbs sunlight and re-emits it as heat. This tiny thrust can significantly change the asteroid's path over millions of years.
The asteroid 'Apophis' gained significant media attention because:
- A It is made of solid gold
- B It has a very close flyby of Earth in 2029
- C It was believed to be an interstellar visitor
- D It is larger than the Moon
Correct answer: It has a very close flyby of Earth in 2029
99942 Apophis is a near-Earth asteroid that will pass within 32,000 km of Earth's surface on April 13, 2029. It will be visible to the naked eye, though current data rules out an impact for the next 100 years.
Which space agency launched the 'Hayabusa2' mission to return samples from asteroid Ryugu?
- A NASA (USA)
- B ESA (Europe)
- C ISRO (India)
- D JAXA (Japan)
Correct answer: JAXA (Japan)
JAXA's Hayabusa2 mission arrived at Ryugu in 2018 and successfully returned a capsule containing pristine asteroid samples to Earth in December 2020.
Asteroids that orbit between the gas giants (Jupiter to Neptune) are known as:
- A Trojans
- B Vulcanoids
- C Damocloids
- D Centaurs
Correct answer: Centaurs
Centaurs are small solar system bodies with unstable orbits that cross the orbits of the giant planets. They behave like a cross between asteroids and comets.