Q1: Which of the following was the first planet to have its motions plotted across the sky during the second millennium BC?
1. Mars
2. Venus
3. Jupiter
4. Saturn
Show Answer
Answer: 2
Explanation: Venus was the first planet to have its motions plotted across the sky, as early as the second millennium BC.
Q2: Which of the following statements is incorrect about the Planet Mars?
1. It has two permanent polar ice caps
2. After the Moon, it is the brightest object in our night sky
3. Liquid water cannot exist on the surface of Mars due to low atmospheric pressure
4. Mars is less dense than Earth
Show Answer
Answer: 2
Explanation: Second statement is incorrect because Venus is the second brightest object in our night sky after the Moon.
Q3: Who among the following proposed Helio-centric model of the solar system?
1. Copernicus
2. Ptolemy
3. Aristotle
4. Strabo
Show Answer
Answer: 1
Explanation: Copernicus proposed the Helio-centric model. According to this model, the sun stands at the centre of the universe, and the Moon, the Earth, and the remaining planets revolve around the sun.
Q4: Geo-centric model of the solar system was proposed by:
1. Copernicus
2. Ptolemy
3. Aristotle
4. Strabo
Show Answer
Answer: 2
Explanation: The geo-centric theory of the solar system was proposed by Ptolemy 2000 years ago. This theory states that all celestial objects, stars, the sun, and the planets, all revolve around the earth.
Q5: Who among the following proposed Laws of planetary motion?
1. Newton
2. Kepler
3. Ptolemy
4. Copernicus
Show Answer
Answer: 2
Explanation: Kepler proposed the Laws of planetary motion. These three laws describe the behaviour of planets in the helio-centric model; The three laws of Kepler can be stated as follows: 1. Law of orbits: All planets move in elliptical orbits with the Sun situated at one of the foci of the ellipse. 2. Law of areas: The line that joins any planet to the sun sweeps equal areas in equal intervals of time. 3. Law of periods: The Square of the time period of the revolution of a planet is proportional to the cube of the semi-major axis of the ellipse traced out by the planet. The law of areas can be understood as a consequence of conservation of angular momentum which is valid for any central force.
Q6: Which of the following planets is an example of Terrestrial planets?
1. Earth
2. Jupiter
3. Saturn
4. Neptune
Show Answer
Answer: 1
Explanation: Mercury, Venus, Earth, and Mars are called the inner planets as they lie between the sun and the belt of asteroids. Inner planets are also known as Terrestrial planets meaning earth-like as they are made up of rock and metals, and have relatively high densities.
Q7: Which of the following planets is an example of Jovian planets?
1. Earth
2. Mercury
3. Venus
4. Saturn
Show Answer
Answer: 4
Explanation: Jupiter, Saturn, Uranus, and Neptune are called the outer planets or Jovian planets or Gas Giant. Most of them are much larger than the terrestrial planets and have thick atmospheres, mostly of helium and hydrogen.
Q8: Which of the following is the least dense planet among all the planets?
1. Earth
2. Uranus
3. Jupiter
4. Saturn
Show Answer
Answer: 4
Explanation: Saturn is the least dense, while Earth is the most dense among all the planets. Its density is less than that of water. The average density of the planets in decreasing order is given below: Planet Average Density (gm/cm?) Earth 5.5 Mercury 5.4 Venus 5.2 Mars 3.9 Neptune 1.6 Jupiter 1.3 Uranus 1.3 Saturn 0.7
Q9: Which among the following are commonly known as shooting stars?
1. Meteors
2. Comets
3. Planets
4. Asteroids
Show Answer
Answer: 1
Explanation: A meteor is usually a small object that occasionally enters the earth’s atmosphere. Some meteors are large and so they can reach the Earth before they evaporate completely. The body that reaches the Earth is called a meteorite.
Q10: Which planet is known as the Morning star?
1. Earth
2. Venus
3. Mercury
4. Jupiter
Show Answer
Answer: 2
Explanation: Sometimes Venus appears in the eastern sky before sunrise. Sometimes it appears in the western sky just after sunset. Therefore, it is often called a morning or an evening star, although it is not a star.
Q11: What is the approximate age of the earth?
1. 3.5 billion years
2. 4.5 billion years
3. 4 billion years
4. 2.5 billion years
Show Answer
Answer: 2
Explanation: Earth is the third planet of the solar system as counted from the sun. The Earth also came into existence almost the same time as the other members of the solar system, i.e. around 4.5 billion years ago.
Q12: What is the distance of the Sun from the Earth?
1. 7 light minutes
2. 8 light minutes
3. 9 light minutes
4. 10 light minutes
Show Answer
Answer: 2
Explanation: The Sun is nearly 150 million km away from the Earth. Such large distances are expressed in another unit known as a light-year. A light-year is the distance travelled by light in one year. The speed of light is about 300,000 km per second. Thus, the distance of the Sun from the Earth may be said to be about 8 light minutes.
Q13: What is the number of Galilean moons of Jupiter discovered by Galileo Galilei in January 1610?
1. 3
2. 4
3. 5
4. None of the above
Show Answer
Answer: 2
Explanation: Four satellites of Jupiter Io, Europa, Ganymede, and Callisto are popularly referred to as the Galilean moons. This is because these moons were discovered by the astronomer Galileo Galilei in January 1610.
Q14: What is the amount in percentage of the total mass, which the Sun comprises of the solar system?
1. 99.02%
2. 93.24%
3. 98.20%
4. 99.8%
Show Answer
Answer: 4
Explanation: The sun holds 99.8% mass of the solar system. It is roughly 109 times the diameter of the Earth, and about one million Earths could fit inside the sun.
Q15: Phobos and Deimos are two satellites of which planet?
1. Jupiter
2. Mars
3. Earth
4. Venus
Show Answer
Answer: 2
Explanation: Mars is known as the red planet because it looks red from Earth. The reddish colour comes from the high concentration of iron oxide compounds—that is, rust—in the rocks of the Martian surface. Phobos and Deimos are the natural satellites of Mars.
Q16: Which planet is known as the Bright Wandering Star?
1. Mars
2. Venus
3. Saturn
4. Jupiter
Show Answer
Answer: 4
Explanation: The word ‘planet’ comes from the ancient Greek ἀστήρ πλανήτης (astēr planētēs), meaning wandering star. The large number of stars observed in the heavens were classified into fixed stars and wandering stars. Fixed stars were those with respect to which the movement of the celestial bodies was measured. Wandering stars are those whose relative distances with respect to the fixed stars keep changing. Mars, Venus, Jupiter, Mercury, and Saturn belonged to the latter category. Among these, Jupiter was known as the Bright Wandering Star.
Q17: Which among the following stars represent the Morning and Evening Stars?
1. Mercury, Venus
2. Venus, Mercury
3. Venus, Venus
4. Mercury, Mercury
Show Answer
Answer: 2
Explanation: Sometimes Venus appears in the eastern sky before sunrise. Sometimes it appears in the western sky just after sunset. Therefore, it is often called a morning or an evening star, although it is not a star.
Q18: What is the Sidereal Month in Hours, Minutes, and Seconds?
1. 27 days, 7 hours, and 11.6 seconds
2. 27 days, 8 hours, and 11.6 seconds
3. 27 days, 9 hours, and 11.6 seconds
4. 27 days, 11 hours, and 11.6 seconds
Show Answer
Answer: 1
Explanation: The sidereal month is the time needed for the Moon to return to the same place against the background of the stars. It is 27.321661 days (i.e., 27 days 7 hours 43 minutes 12 seconds). The difference between synodic and sidereal lengths is due to the orbital movement.
Q19: Mars appears red because of the presence of the following compounds on its surface?
1. Copper Oxide
2. Iron Oxide
3. Copper Sulphide
4. Magnesium Oxide
Show Answer
Answer: 2
Explanation: Mars is known as the red planet because it looks red from Earth. The reddish colour comes from the high concentration of iron oxide compounds—that is, rust—in the rocks of the Martian surface.
Q20: Which among the following is also known as Earth’s sister Planet?
1. Venus
2. Mars
3. Jupiter
4. Saturn
Show Answer
Answer: 1
Explanation: Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. It is named after the Roman goddess of love and beauty. It is a terrestrial planet and is sometimes called Earth’s sister planet because of their similar size, mass, proximity to the Sun, and bulk composition. It has no natural satellite. But it is radically different from Earth in other respects. It has the densest atmosphere of four terrestrial planets, consisting of more than 96% CO2. The atmospheric pressure at its planet’s surface is 92 times that of Earth.
Q21: Which among the following gases is abundant in the atmosphere of Mars?
1. Carbon Dioxide
2. Nitrogen
3. Argon
4. Carbon Monoxide
Show Answer
Answer: 1
Explanation: The Curiosity rover sent by NASA, which landed on Mars on August 6, 2012, with the aim to explore the Red Planet, has confirmed that its air is made mostly of carbon dioxide with hints of other gases.
Q22: What is the escape velocity at the Moon?
1. 2.38 km/s
2. 4.38 km/s
3. 6.38 km/s
4. 1.38 km/s
Show Answer
Answer: 1
Explanation: The Moon is an astronomical body orbiting Earth. It is the fifth-largest satellite in the Solar System. It also has an estimated mass of 7.342 x 10^22 kg, and an escape velocity is 2.38 km/s.
Q23: On which planet, due to its clockwise (east to west) rotation on the axis, the Sun rises in the west and sets in the east?
1. Mercury
2. Venus
3. Earth
4. Mars
Show Answer
Answer: 2
Explanation: Venus rotates on its polar axis backward compared to Earth, so a Venus sunrise occurs in the west and sunset in the east.
Q24: Which among the following natural satellites of our solar system is smaller than the Moon?
1. Callisto
2. Titan
3. Io
4. Europa
Show Answer
Answer: 4
Explanation: Europa, or Jupiter II, is the smallest of the four Galilean moons orbiting Jupiter. It is the sixth-closest to the planet of all the 79 known moons of Jupiter. It is the sixth-largest moon in the Solar System and is smaller than Earth’s moon.
Q25: Approximately how much time does a Sun ray take to reach Earth?
1. 400 seconds
2. 500 seconds
3. 600 seconds
4. 700 seconds
Show Answer
Answer: 2
Explanation: Light travels at a speed of 299,792 km per second. It takes 500 seconds for light to travel from the Sun to the Earth. This distance is called 1 Astronomical Unit.
Q26: What is the number of known satellites of Jupiter?
1. 35
2. 55
3. 42
4. 79
Show Answer
Answer: 4
Explanation: There are 79 known moons of Jupiter, and they form a satellite system known as the Jovian system. The most massive of the moons are the four Galilean moons: Io, Europa, Ganymede, and Callisto, which were independently discovered in 1610 by Galileo Galilei and Simon Marius and were the first objects found to orbit a body that was neither Earth nor the Sun.
Q27: How many times is the Sun heavier than Earth?
1. 3,300 times
2. 33,000 times
3. 3,30,000 times
4. 33,30,000 times
Show Answer
Answer: 3
Explanation: The sun lies at the heart of the solar system, and it is the largest object. It holds 99.8 percent of the solar system’s mass and is roughly 109 times the diameter of the Earth. It is 3,30,000 times heavier than Earth.
Q28: Sun is best kept in which among the following categories?
1. Red Dwarf
2. Yellow Dwarf
3. Brown Dwarf
4. Helium White Dwarf
Show Answer
Answer: 2
Explanation: Yellow dwarfs are stars of medium size. The sun is the yellow dwarf. A yellow dwarf is a star belonging to the main sequence of spectral type G and weighing between 0.7 and 1 times the solar mass. They have a surface temperature of about 6000 °C and shine a bright yellow, almost white.
Q29: Nebular Hypothesis is a theory which is related to the origin of the following?
1. Sun
2. Solar System
3. Galaxy
4. Universe
Show Answer
Answer: 2
Explanation: The nebular hypothesis is a model that explains the formation and evolution of the Solar System. It suggests that the Solar System formed from gas and dust orbiting the Sun.
Q30: The Planetoids are located between which among the following?
1. Mars and Jupiter
2. Saturn & Jupiter
3. Mercury and Venus
4. Earth & Mars
Show Answer
Answer: 1
Explanation: Asteroids, also called the inner solar system, are minor planets which are neither categorised as a planet nor a comet. They are in direct orbit around the Sun. They primarily remain on the circumstellar disk of gas around new stars and also the debris of the disk together. They are also known as planetoids and range in size from hundreds of miles to a few feet. Most of them are irregular in shape. They are majorly present in the asteroid belt between Mars and Jupiter.
Q31: The only planet that shows phases is:?
1. Earth
2. Venus
3. Jupiter
4. Saturn
Show Answer
Answer: 2
Explanation: Through a small telescope, it is possible to see Venus undergo phases, just like the Moon. This occurs because, from our point of view on Earth, we see only the parts of Venus that are illuminated by sunlight at any given time. However, unlike the Moon, Venus is usually brighter to our view in its crescent phase than in its full phase.
Q32: Apart from Saturn, which of the following planets have planetary ring systems of their own?
1. Jupiter only
2. Jupiter, Uranus & Neptune
3. Jupiter & Uranus
4. Jupiter & Neptune
Show Answer
Answer: 2
Explanation: Apart from Saturn, Jupiter, Uranus, and Neptune possess ring systems of their own. They are mostly made up of gases and dust particles.
Q33: Which among the following is the major cause of nutation in Earth’s axis?
1. Earth’s Oblate spheroid shape
2. The difference between Land and Sea hemispheres
3. Oceanic Currents
4. Tidal Forces
Show Answer
Answer: 4
Explanation: In the case of the Earth, the principal sources of tidal force are the Sun and Moon, which continuously change location relative to each other and thus cause nutation in Earth’s axis.
Q34: Europa is the moon of which among the following planets?
1. Saturn
2. Jupiter
3. Mars
4. Uranus
Show Answer
Answer: 2
Explanation: Europa is an icy moon of the planet Jupiter. It has long been a high priority for its exploration because it holds a salty liquid water ocean beneath its icy crust. The ultimate aim of NASA’s Europa Clipper mission is to determine if Europa is habitable.
Q35: How much time does a ray of light take while reaching from the Moon to Earth?
1. 8 minutes
2. 8 seconds
3. 1 minute
4. 1 second
Show Answer
Answer: 4
Explanation: Moonlight takes approximately 1.26 seconds to reach Earth’s surface. Moon generally doesn’t emit light. It reflects light from the sun.
Q36: Uranus takes how much time to revolve around the Sun?
1. 36 years
2. 56 years
3. 76 years
4. 84 years
Show Answer
Answer: 4
Explanation: Uranus takes about 84 years to revolve around the sun. It has the third-largest planetary radius. Uranus has the 4th largest mass.
Q37: Titan is the largest moon of:?
1. Uranus
2. Jupiter
3. Saturn
4. Earth
Show Answer
Answer: 3
Explanation: Titan is the moon of Saturn. It is the largest moon of Saturn and the second-largest natural satellite in the solar system.
Q38: Triton is a moon of which of the following planets?
1. Uranus
2. Neptune
3. Jupiter
4. Venus
Show Answer
Answer: 2
Explanation: Neptune is the eighth and farthest-known planet from the Sun in the Solar System. It is 17 times the mass of Earth. Neptune has 14 known moons. Triton is the largest Neptunian moon.
Q39: Who discovered the rings of Saturn?
1. Galileo
2. Newton
3. Edmund Halley
4. Einstein
Show Answer
Answer: 1
Explanation: Galileo Galilei was the first to observe the rings of Saturn in 1610 using his telescope. He called them Saturn’s ears.
Q40: Which among the following comets is seen every 75-76 years?
1. Halley’s Comet
2. Holme’s Comet
3. Donati’s Comet
4. Orion
Show Answer
Answer: 1
Explanation: Halley’s Comet is one of the most famous comets. It is a periodic comet. It returns to Earth’s vicinity about every 75 years, and this makes it possible for a human to see it twice in his or her lifetime. The last time it was here was in 1986, and it is projected to return in 2061.
Q41: The size, mass & density of which of the planets is very near to those of Earth?
1. Venus
2. Mercury
3. Jupiter
4. Saturn
Show Answer
Answer: 1
Explanation: The size, mass & density of Venus is very close to that of Earth. Venus is the second planet from the Sun. It is the second-brightest natural object in the night sky after the Moon.
Q42: Ganymede is the largest moon in the Solar System. It is a satellite of _____.
1. Venus
2. Saturn
3. Jupiter
4. Mars
Show Answer
Answer: 3
Explanation: Jupiter’s moon Ganymede is the largest satellite in the solar system. It is larger than Mercury and Pluto. Jupiter is the largest planet in the solar system.
Q43: Sun Eclipse occurs at which of the following phases of the Moon?
1. Full Moon
2. Half Moon
3. New Moon
4. Either Full Moon or New Moon
Show Answer
Answer: 3
Explanation: A solar eclipse occurs when the shadow of the moon falls on earth. It fully or partially blocks sunlight. This occurs when the Sun, Moon, and Earth are aligned. Such alignment coincides with a new moon indicating the Moon is closest to the ecliptic plane.
Q44: Leap second is always?
1. positive one-second adjustment
2. negative one-second adjustment
3. positive or negative one-second adjustment
4. two-second adjustment
Show Answer
Answer: 3
Explanation: A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time. It is to accommodate the difference between precise time and imprecise observed solar time.
Q45: On which of the following the weight of a person will be minimum?
1. Venus
2. Mars
3. Moon
4. Mercury
Show Answer
Answer: 3
Explanation: 100 kg on Earth is equivalent to 16.6 kg on the Moon and 37.8 kg on Mercury.
Q46: On which of the planets/satellites the weight of a person will be maximum?
1. Earth
2. Mars
3. Venus
4. Jupiter
Show Answer
Answer: 4
Explanation: 100 kg on Earth is equivalent to 236.4 kg on Jupiter. A person of 100 kg will weigh as follows on different planets: Mercury – 38 kg, Venus – 91 kg, Earth – 100 kg, Mars – 38 kg, Jupiter – 234 kg, Saturn – 106 kg, Uranus – 92 kg, Neptune – 119 kg, Pluto – 6 kg, Sun – 2707 kg.
Q47: Which among the following is the most important character of the ‘Goldilocks Zone’ of space?
1. It is a small region that is extremely hot and has the presence of most elements in the vapour state
2. It is a small region of space that is extremely cold
3. It is a region of space that is neither too hot nor too cold and has conditions that are a must for life
4. It is a region of space that is characterised by a lot of asteroids
Show Answer
Answer: 3
Explanation: The Goldilock region is the space which is neither too hot nor too cold and has conditions that are a must for life. So the Goldilock zone is a habitable zone.
Q48: Which among the following celestial bodies was discovered by a prominent Dutch astronomer Christiaan Huygens?
1. Pluto
2. Titan
3. Phobius
4. Neptune
Show Answer
Answer: 2
Explanation: Titan is the largest moon of Saturn. It was discovered by a prominent Dutch astronomer Christiaan Huygens.
Q49: In the 1970s, NASA had launched two space programs Viking 1 and Viking 2 on which planet?
1. Mars
2. Venus
3. Jupiter
4. Moon
Show Answer
Answer: 1
Explanation: The Viking program consisted of a pair of American space probes sent to Mars, Viking 1 and Viking 2. They were launched in 1975. Each spacecraft was composed of two main parts: an orbiter designed to photograph the surface of Mars from orbit, and a lander designed to study the planet from the surface.
Q50: Which among the following planets in the Solar System has the fastest rotation?
1. Mercury
2. Venus
3. Mars
4. Jupiter
Show Answer
Answer: 4
Explanation: Jupiter is the planet that has the fastest rotation. It has an orbital period of 12 years. It is the fifth planet from the sun.
Q51: Heliopose is the theoretical boundary beyond which ____:
1. Light from Sun cannot reach
2. Heat from Sun cannot reach
3. Solarwinds cannot reach
4. No existence of Solar system
Show Answer
Answer: 3
Explanation: Heliopose is the theoretical boundary beyond which SolarWinds cannot reach. The heliosphere is the vast, bubble-like region of space which surrounds and is created by the Sun.
Q52: Which among the following is the correct term for the inner portion of the moon’s shadow?
1. Umbra
2. Penumbra
3. Antumbra
4. Adularescence
Show Answer
Answer: 1
Explanation: Umbra is a shadow, a dark area that is formed when light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross-section of a shadow is a two-dimensional silhouette or a reverse projection of the object blocking the light.
Q53: What is the reason for Venus being the hottest planet of the Solar system?
1. Proximity to Sun
2. Greenhouse gases in the atmosphere
3. High speed of Rotation
4. Presence of a powerful magnetic field
Show Answer
Answer: 2
Explanation: Venus has surface temperatures over 400 °C and it is the hottest planet in the Solar system, most likely due to the amount of greenhouse gases in the atmosphere.
Q54: Mass of the Sun equals how many moons of Earth (approximately)?
1. 2.7 Lakh
2. 27 Lakh
3. 270 Lakh
4. 2700 Lakh
Show Answer
Answer: 3
Explanation: The mass of the sun is equal to 270 lakh moons. About 1.3 million Earths could fit inside the sun. The mass of the sun is 1.989 x 10^30 kilograms, about 333,000 times the mass of the Earth.
Q55: What is the rank of Earth in the Solar system in terms of mean Radius?
1. 1st
2. 3rd
3. 5th
4. 7th
Show Answer
Answer: 3
Explanation: The rank of Earth in terms of mean radius is 5th. Jupiter, Saturn, and Uranus are the top 3 with on the basis of mean radius.
Q56: Which among the following is the new name of Pluto?
1. 134340
2. 134344
3. 133440
4. 131341
Show Answer
Answer: 1
Explanation: Pluto has been given a new name to reflect its new status as a dwarf planet. The 9th planet was assigned the asteroid number 134340 by the Minor Planet Center (MPC), the official organisation responsible for collecting data about asteroids and comets in our solar system.
Q57: The International Space Station is located in which among the following orbits?
1. Low Earth Orbit (LEO)
2. Medium Earth orbit (MEO)
3. Intermediate Circular Orbit (ICO)
4. Geostationary Orbit (GEO)
Show Answer
Answer: 1
Explanation: The International Space Station is a modular space station in low Earth orbit. The ISS program is a multi-national collaborative project between five participating space agencies: NASA, Roscosmos, JAXA, ESA, and CSA. It is an international collaborative effort between multiple countries.
Q58: New Horizons’ spacecraft was launched by NASA to study which of the following planets?
1. Mars
2. Pluto
3. Jupiter
4. Mercury
Show Answer
Answer: 2
Explanation: The New Horizons was launched from Cape Canaveral Air Force Station to study the surface of Pluto. It was the fastest man-made object ever launched from Earth.
Q59: Olympus Mons is located on which planet?
1. Jupiter
2. Mars
3. Venus
4. Saturn
Show Answer
Answer: 2
Explanation: Olympus Mons is a very large shield volcano on the planet Mars. The volcano has a height of over 21 km. Olympus Mons is about two and a half times Mount Everest’s height above sea level.
Q60: Which among the following are gaseous planets?
1. Mercury, Venus, Earth, Mars
2. Mercury, Jupiter, Saturn, Uranus
3. Saturn, Uranus, Neptune, Pluto
4. Jupiter, Saturn, Uranus, Neptune
Show Answer
Answer: 4
Explanation: Gaseous planets, also called outer planets or Jovian planets, include Jupiter, Saturn, Uranus, and Neptune. They are made up of hot gases, mainly hydrogen and helium.
Q61: Which among the following is not a dwarf planet?
1. Ceres
2. Pluto
3. Neptune
4. Eris
Show Answer
Answer: 3
Explanation: A dwarf planet is defined as a celestial body revolving around a star with enough mass to have hydrostatic equilibrium but not enough mass to clear its path around the parent star. Examples of dwarf planets include Ceres, Pluto, Eris, Haumea, etc. Neptune, on the other hand, is a full-fledged planet.
Q62: What is the approximate distance between the Earth and the Sun?
1. 350 million km
2. 100 million km
3. 150 million km
4. 250 million km
Show Answer
Answer: 3
Explanation: The Sun is at the heart of the Solar system, and all the planets revolve around it. The distance between the Earth and the Sun is approximately 150 million km, which is equivalent to 1 AU (Astronomical Unit).
Q63: Majority of the asteroids are found between the orbits of which of the following planets?
1. Earth and Mars
2. Mercury and Venus
3. Jupiter and Saturn
4. Mars and Jupiter
Show Answer
Answer: 4
Explanation: The belt of asteroids is present between the orbits of the planets Mars and Jupiter. It separates the inner planets from the outer planets of the solar system.
Q64: What is the age of the solar system?
1. 13.7 billion years
2. 4.6 billion years
3. 4.3 billion years
4. 13.51 billion years
Show Answer
Answer: 2
Explanation: The formation and evolution of our solar system started 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud.
Q65: What is the diameter of the Sun?
1. 10 lakh km
2. 20 lakh km
3. 11 lakh km
4. 14 lakh km
Show Answer
Answer: 4
Explanation: The sun’s diameter comes from its angular size and distance. It is approximately 14 lakh km.
Q66: How much time does the light of the sun take to reach the Earth?
1. 7 minutes
2. 9 minutes
3. 5 minutes
4. 8 minutes
Show Answer
Answer: 4
Explanation: Light takes 8 minutes 19 seconds to reach from the surface of the sun to the surface of the Earth.
Q67: What is the temperature at the outer surface of the Sun?
1. 10000 degrees C
2. 4000 degrees C
3. 6000 degrees C
4. 100000 degrees C
Show Answer
Answer: 3
Explanation: Within the Sun, hydrogen is converted into Helium due to Nuclear Fusion, releasing a tremendous amount of heat and light. It has a surface temperature of 6000 degrees C.
Q68: What is the Outer layer of the atmosphere of the Sun called?
1. Photosphere
2. Chromosphere
3. Heliosphere
4. Corona
Show Answer
Answer: 4
Explanation: The Sun’s corona is the outermost layer of its atmosphere and extends millions of kilometres into outer space. It is visible only during the eclipse.
Q69: Which is the largest asteroid in the solar system?
1. Haumea
2. 4 Vesta
3. 2 Pallas
4. Ceres
Show Answer
Answer: 4
Explanation: Ceres is the largest and the most massive asteroid in the main asteroid belt lying between the orbits of Mars and Jupiter. It is also classified as a dwarf planet.
Q70: Which among the following is a hypothesised area at the edge of the Solar system?
1. Oort cloud
2. Comets
3. Proxima Centauri
4. Meteor
Show Answer
Answer: 1
Explanation: The Oort cloud is the remains of the early stages of our solar system’s formation. It spans beyond the orbits of Neptune and Pluto and is a hypothesised region of icy objects. It was named after Dutch astronomer Jan Hendrik Oort, who proposed its existence in 1950.
Q71: Which among the following is not a dwarf planet?
1. Ceres
2. Phobos
3. Eris
4. Makemake
Show Answer
Answer: 2
Explanation: There are 5 known dwarf planets – Pluto, Makemake, Haumea, Eris, and Ceres. Phobos is a satellite of Mars, not a dwarf planet.
Q72: What is the bubble-like region in the interstellar medium known as?
1. Chromosphere
2. Heliosphere
3. Photosphere
4. Corona
Show Answer
Answer: 2
Explanation: The heliosphere is the bubble-like region of space within which plasma is blown outwards from the sun.
Q73: In which arm of the Milky Way Galaxy is our solar system located?
1. Carina – Sagittarius arm
2. Orion arm
3. Perseus arm
4. Scutum-Centaurus arm
Show Answer
Answer: 2
Explanation: The Orion arm is the minor spiral arm of the Milky Way Galaxy. Our solar system is located in the Orion arm.
Q74: What is the body’s closest approach to the sun called?
1. Aphelion
2. Perihelion
3. Ellipse
4. Prograde
Show Answer
Answer: 2
Explanation: Aphelion is the most distant approach to the sun, while perihelion is the closest approach.
Q75: What are comets popularly described as?
1. Quasi-planet
2. Planetoids
3. Dirty snowballs
4. Meteoroids
Show Answer
Answer: 3
Explanation: All the comets visited so far primarily consist of ice, which is why they are popularly referred to as Dirty snowballs.
Q76: Who proposed the nebular cloud hypothesis theory of the origin of the solar system?
1. Karl Von Weizsacker
2. Gerald Kuiper
3. Fred Hoyle
4. Edwin Hubble
Show Answer
Answer: 1
Explanation: Karl Von Weizsacker, a German physicist, put forth the nebular cloud hypothesis theory explaining the origin of the solar system. According to him, the solar system was formed due to the condensation of fine particles of dense interstellar clouds of gases and dust from a nebula surrounding the sun.
Q77: Who proposed the Nova Hypothesis theory of the origin of the solar system?
1. A.C. Banerjee
2. F. Hoyle
3. Otto Schmidt
4. Gerald Kuiper
Show Answer
Answer: 2
Explanation: F. Hoyle and Lyttleton proposed the Nova Hypothesis theory, explaining that the solar system originated because of the explosion of a supernova.
Q78: The term planetoids is used for ___?
1. Satellites of Solar System
2. Dwarf Planets
3. Comets
4. Asteroids
Show Answer
Answer: 4
Explanation: Asteroids are tiny planetary bodies that revolve around the sun. They are present between the orbits of Jupiter and Mars. As they revolve around the sun like other planets, they are also called planetoids.
Q79: Which among the following is not a superior planet?
1. Venus
2. Mars
3. Jupiter
4. Saturn
Show Answer
Answer: 1
Explanation: The planets that are present at a distance greater than the distance of the Earth from the sun are called superior planets. Superior planets include Mars, Jupiter, Saturn, Uranus, and Neptune. Venus is an inferior planet.
Q80: How long does it take for the sun to complete one rotation?
1. 20 days
2. 60 days
3. 40 days
4. 27 days
Show Answer
Answer: 4
Explanation: On average, the sun rotates around its axis every 27 days. It spins the fastest at its equator (27 days) and 31 days around the pole.
Q81: Which layer of the Sun has a reddish glow?
1. Photosphere
2. Corona
3. Chromosphere
4. Heliosphere
Show Answer
Answer: 3
Explanation: The chromosphere, from the word chromo meaning ‘colour,’ is therefore called the colour sphere. The chromosphere is the layer of the sun that has a reddish glow.
Q82: What are reddish loops of gas that link parts of sunspot regions called?
1. Solar flare
2. Prominence
3. Solar wind
4. Sunspot
Show Answer
Answer: 2
Explanation: Prominence is the red-glowing looped material bound by the sun’s magnetic field and can last for months.
Q83: Which among the following planets revolves around the sun from east to west?
1. Venus
2. Mercury
3. Earth
4. Jupiter
Show Answer
Answer: 1
Explanation: All planets, except Venus and Uranus, revolve around the sun from west to east.
Q84: Which among the following planets is an inferior planet?
1. Saturn
2. Neptune
3. Mars
4. Venus
Show Answer
Answer: 4
Explanation: The planets closer to the Sun than the Earth are called inferior planets. For example, Mercury and Venus.
Q85: Which among the following planets is also called the ‘dusty planet’?
1. Venus
2. Mercury
3. Jupiter
4. Mars
Show Answer
Answer: 4
Explanation: Due to frequent dust storms, Mars is also called the Pigpen Planet because it is the dustiest place in the solar system.
Q86: Which planet is also called the winter planet?
1. Mercury
2. Neptune
3. Jupiter
4. Uranus
Show Answer
Answer: 3
Explanation: Jupiter, the largest planet of the solar system, is also known as the winter planet as its average temperature is very low (-148 degrees C).
Q87: The Great Red Spot on Jupiter is a __:
1. High-Pressure region that rotates clockwise
2. Low-Pressure region that rotates clockwise
3. High-Pressure Region that rotates anti-clockwise
4. Low-Pressure region that rotates anti-clockwise
Show Answer
Answer: 3
Explanation: The Great Red Spot is a persistent high-pressure region in the atmosphere of Jupiter, producing an anticyclonic storm that is the largest in the Solar System. It rotates counterclockwise, with a period of about six Earth days.
Q88: Which is the first planet to have been discovered by the use of a telescope?
1. Jupiter
2. Mars
3. Saturn
4. Uranus
Show Answer
Answer: 4
Explanation: Sir William Herschel first observed Uranus on 13 March 1781, leading to its discovery as a planet, expanding the known boundaries of the Solar System for the first time in history and making Uranus the first planet classified as such with the aid of a telescope.
Q89: Which planet is called a planet on its side?
1. Saturn
2. Uranus
3. Jupiter
4. Mars
Show Answer
Answer: 2
Explanation: The axis of Uranus is tilted nearly perpendicular to the Sun, and it appears that it orbits on its side. The large inclination on its orbit makes it appear to be lying down, that is why it is called ‘a planet on its side’.
Q90: Which planet is called the twin of Uranus?
1. Saturn
2. Jupiter
3. Neptune
4. Mars
Show Answer
Answer: 3
Explanation: Neptune is very similar to Uranus in terms of size, mass, composition, and rotation. They are therefore referred to as twin planets.
Q91: Which planet has the largest number of satellites?
1. Saturn
2. Jupiter
3. Mars
4. Neptune
Show Answer
Answer: 1
Explanation: Saturn has overtaken Jupiter as the planet with the largest number of satellites. Saturn has at least 82 satellites, while Jupiter has 79 satellites.
Q92: Which planet is also called ‘the green planet’?
1. Neptune
2. Saturn
3. Jupiter
4. Uranus
Show Answer
Answer: 4
Explanation: Uranus is four times the size of the Earth. It appears greenish in colour because of the large amount of methane gas present in its atmosphere.
Q93: Which planet is also known as the ‘Veiled Planet’?
1. Venus
2. Mercury
3. Mars
4. Jupiter
Show Answer
Answer: 1
Explanation: Venus, the planet nearest to the Earth, is surrounded by a thick cloud cover, hence known as the Veiled Planet (veil means unclear/cover).
Q94: Which planet is the hottest planet of the solar system?
1. Mercury
2. Venus
3. Mars
4. Jupiter
Show Answer
Answer: 2
Explanation: Venus is the hottest planet (even hotter than Mercury) of our solar system, due to its veil of clouds of sulphuric acid and carbon dioxide; and the resultant greenhouse effect.
Q95: Which among the following is an asteroid as well as a dwarf planet?
1. Ceres
2. Vesta
3. Juno
4. Pallas
Show Answer
Answer: 1
Explanation: Vesta, Juno, and Pallas are asteroids, whereas Ceres is an asteroid as well as a dwarf planet. Ceres was classified as a dwarf planet in 2006.
Q96: Who among the following discovered the largest moon of Saturn – Titan?
1. Galileo
2. Christiaan Huygens
3. Nicholas Copernicus
4. F. Hoyle
Show Answer
Answer: 2
Explanation: One of the greatest scientists of his times, Christiaan Huygens, is known for his study of the rings of Saturn and the discovery of its largest moon – Titan.
Q97: Which among the following is not a Galilean Moon?
1. Europa
2. Ganymede
3. Phobos
4. Callisto
Show Answer
Answer: 3
Explanation: The Galilean Moons – Io, Europa, Callisto, Ganymede are the satellites of Jupiter recognized by Galileo.
Q98: Ancient Greeks used the term Phaethon for which planet?
1. Saturn
2. Jupiter
3. Mars
4. Venus
Show Answer
Answer: 2
Explanation: Phaethon was the son of the Sun god Helios in Greek mythology and also an alternative name for the planet Jupiter. The ancient Greeks also called Zeus to Jupiter. The names of Mercury, Venus, Mars, Jupiter, and Saturn by ancient Greeks were Hermes, Aphrodite, Ares, Zeus, and Cronus, respectively.
Q99: What was the ‘Moon’ called in ancient Greece?
1. Phosphorus
2. Helios
3. Selene
4. Phainon
Show Answer
Answer: 3
Explanation: In ancient Greece, the sun and the moon were called Helios and Selene, respectively.
Q100: Which among the following planets is an ice giant?
1. Saturn
2. Jupiter
3. Neptune
4. Mars
Show Answer
Answer: 3
Explanation: Ice giants are giant planets, composed mainly of elements heavier than helium and hydrogen. Neptune and Uranus are the two ice giants of the solar system.
Q101: Who proposed the term dwarf planet?
1. F. Hoyle
2. Alan Stern
3. Galileo
4. Copernicus
Show Answer
Answer: 2
Explanation: The term dwarf planet was coined by an American planetary scientist Alan Stern.
Q102: Which planet among the following does not have a natural satellite?
1. Saturn
2. Mercury
3. Neptune
4. Uranus
Show Answer
Answer: 2
Explanation: All planets except Mercury and Venus have natural satellites also called moons.
Q103: Which among the following planets and its associated weather system is not correctly matched?
1. The Great Red Spot – Saturn
2. Dust Storms – Mars
3. Hurricanes – Earth
4. Holes in atmosphere – Neptune
Show Answer
Answer: 1
Explanation: The Great Red Spot is a giant spinning storm (anticyclone) in the atmosphere of Jupiter.
Q104: What is a planet’s rotation period also known as?
1. Hydrostatic Equilibrium
2. Stellar day
3. Retrograde rotation
4. Axial tilt
Show Answer
Answer: 2
Explanation: All planets rotate around an invisible axis. Their rotation is also called a stellar day.
Q105: The BepiColombo spacecraft is related to which planet?
1. Mars
2. Jupiter
3. Saturn
4. Mercury
Show Answer
Answer: 4
Explanation: BepiColombo is a joint mission of the European Space Agency (ESA) and Japan Aerospace Exploration Agency (JAXA) to the planet Mercury.
Q106: What is the average distance of the Moon from the earth?
1. 434800 km
2. 443800 km
3. 384400 km
4. 843400 km
Show Answer
Answer: 3
Explanation: The average distance between the Earth and the Moon is 384400 km.
Q107: Which planet is referred to as Earth’s sister planet?
1. Mars
2. Venus
3. Mercury
4. Jupiter
Show Answer
Answer: 2
Explanation: Venus is called Earth’s sister planet because of the similarities in mass, size, and composition.
Q108: The Magellan spacecraft was sent to study which planet?
1. Jupiter
2. Saturn
3. Mars
4. Venus
Show Answer
Answer: 4
Explanation: The surface of the planet Venus was mapped in detail by the spacecraft Magellan in 1990-91.
Q109: The ‘Amazonian period’ is related to which planet?
1. Venus
2. Mars
3. Jupiter
4. Saturn
Show Answer
Answer: 2
Explanation: The Amazonian period (3.3 and 2.9 billion years ago to the present) is a geological time period characterised by low rates of asteroid and meteorite impacts on Mars.
Q110: Which was the first spacecraft to visit the planet Jupiter?
1. New Horizons
2. Pioneer 10
3. Galileo Orbiter
4. InSight
Show Answer
Answer: 2
Explanation: Pioneer 10 was the first spacecraft to make the closest approach to the planet Jupiter in 1973.
Q111: Which is the only planet whose barycenter with the Sun lies outside the volume of the Sun?
1. Jupiter
2. Mars
3. Earth
4. Neptune
Show Answer
Answer: 1
Explanation: Jupiter is the only planet whose barycenter (the centre of mass of two or more bodies orbiting each other and the point about which the two bodies orbit) with the sun lies outside the volume of the sun.
Q112: Which is the first spacecraft to orbit Jupiter?
1. Pioneer 10
2. Galileo
3. InSight
4. New Horizons
Show Answer
Answer: 2
Explanation: Galileo is the first spacecraft to orbit the planet Jupiter. It entered orbit on 7th December 1995.
Q113: Which planet is named after a Roman god of Wealth and Agriculture?
1. Saturn
2. Neptune
3. Jupiter
4. Mercury
Show Answer
Answer: 1
Explanation: Saturn was a god in ancient Roman religion, and a character in Roman mythology described as the god of generation, dissolution, plenty, wealth, agriculture, periodic renewal, and liberation. It is represented by the symbol of God’s sickle.
Q114: Which is the only moon in our solar system to have a substantial atmosphere?
1. Phobos
2. Ganymede
3. Europa
4. Titan
Show Answer
Answer: 4
Explanation: Titan is the only moon in the solar system to have a dense atmosphere and earth-like cycle of liquid in its atmosphere.
Q115: Which is the least dense planet in our solar system?
1. Jupiter
2. Uranus
3. Neptune
4. Saturn
Show Answer
Answer: 4
Explanation: Saturn is 30% less dense than water. It is so light that it can float on water.
Q116: The phenomenon Rainfall of Diamonds occurs on which of the following planets?
1. Saturn
2. Uranus
3. Neptune
4. All of the above
Show Answer
Answer: 4
Explanation: Rainfalls of Diamonds (formed from methane) occur on the planets Saturn, Jupiter, Uranus, and Neptune.
Q117: The phenomena ‘Great white spot’ is associated with which planet?
1. Saturn
2. Uranus
3. Neptune
4. All of the above
Show Answer
Answer: 1
Explanation: The Great white spot (Great white Oval) is a phenomena associated with large periodic storms in the atmosphere of Saturn which are visible from the planet Earth.
Q118: Cassini Mission was sent to study?
1. Saturn
2. Jupiter
3. Mars
4. Neptune
Show Answer
Answer: 1
Explanation: The Cassini Mission or Cassini-Huygens space-research mission was a mission to study Saturn sent in collaboration among NASA, the European Space Agency (ESA), and the Italian Space Agency (ASI). It was named after astronomers Giovanni Cassini and Christiaan Huygens. It was launched in 1997 and ended in 2017 after 20 years of service.
Q119: Which among the following is not a satellite of Uranus?
1. Titania
2. Ganymede
3. Ariel
4. Oberon
Show Answer
Answer: 2
Explanation: Ganymede, the satellite of Jupiter is the largest satellite in the solar system. The satellites of Uranus include – Ariel, Titania, Oberon, Umbriel, and Miranda.
Q120: Which planet is named after the Roman God of Sea?
1. Uranus
2. Neptune
3. Saturn
4. Jupiter
Show Answer
Answer: 2
Explanation: The planet Neptune, the eighth and the farthest planet from the sun in the solar system, is named after the god of freshwater and sea.
Q121: Which planet is associated with the moon Triton?
1. Saturn
2. Pluto
3. Uranus
4. Neptune
Show Answer
Answer: 4
Explanation: Triton is the first neptunian moon to be discovered. It is also the largest natural satellite of the planet Neptune.
Q122: Which spacecraft was launched to study outer planets in the solar system?
1. BepiColombo
2. InSight
3. Voyager
4. Messenger
Show Answer
Answer: 3
Explanation: The Voyager space probe was launched by NASA in 1977 to study the outer planets of the solar system.
Q123: Which planet in the solar system is associated with the phenomena ‘Great Dark Spot’?
1. Neptune
2. Jupiter
3. Saturn
4. Uranus
Show Answer
Answer: 1
Explanation: Great Dark Spots are associated with the phenomena of anticyclonic storms in the atmosphere of Neptune.
Q124: Which planet’s internal structure resembles that of the planet Uranus?
1. Saturn
2. Neptune
3. Jupiter
4. Mars
Show Answer
Answer: 2
Explanation: The interior structures of the planets Neptune and Uranus are very similar. The mass, size, and composition of both the planets are so similar that they are primarily referred to as planetary twins.
Q125: NASA’s robotic spacecraft MESSENGER was sent to study ____?
1. Mars
2. Mercury
3. Jupiter
4. Saturn
Show Answer
Answer: 2
Explanation: The robotic spacecraft by NASA orbited the planet Mercury to study its chemical composition, magnetic field, and geology.
Q126: Who discovered the planet Uranus?
1. Galileo
2. Copernicus
3. William Herschel
4. F. Hoyle
Show Answer
Answer: 3
Explanation: William Herschel, a British astronomer, first discovered the planet Uranus in 1781.
Q127: Which among the following is not an alternative name for Earth?
1. Gaea
2. Ceres
3. Tellus
4. Terra
Show Answer
Answer: 2
Explanation: The planet Earth is also called Terra, Tellus, Gaea, Gaia, the World, and the Globe. Ceres is an asteroid and a dwarf planet.
Q128: When did the formation of the Earth take place?
1. 6.84 billion years ago
2. 4.54 billion years ago
3. 5.46 billion years ago
4. 2.64 billion years ago
Show Answer
Answer: 2
Explanation: The formation of planet Earth took place around 4.54 billion years ago. It is one-third the age of the universe.
Q129: What Eon is characterised by Earth’s initial formation?
1. Proterozoic Eon
2. Hadean Eon
3. Phanerozoic Eon
4. Cenozoic Era
Show Answer
Answer: 2
Explanation: The Hadean Eon (4.6 billion years ago – 4 billion years ago) is associated with the early formation of the planet Earth.
Q130: Who among the following is not related to the theory of evolution of the Earth?
1. Laplace
2. Kant
3. Chamberlin
4. Humboldt
Show Answer
Answer: 4
Explanation: Theories on the formation of Earth have been put forward by Laplace, Chamberlin, Kant, Moulten, etc. Alexander Von Humboldt is regarded as the Father of Climatology and Modern Geography.
Q131: Who put forward the Gaseous Hypothesis theory of the origin of Earth?
1. Laplace
2. Chamberlin
3. Kant
4. James Jeans
Show Answer
Answer: 3
Explanation: Kant put forward his gaseous hypothesis theory in 1755. This theory was based on Newton’s law of Gravitation.
Q132: Who proposed the Nebular Hypothesis Theory of the origin of Earth?
1. Edwin Hubble
2. Chamberlin
3. Laplace
4. James Jeans
Show Answer
Answer: 3
Explanation: Laplace put forward his nebular hypothesis theory in 1789. According to this theory, the planets were formed out of a cloud of material associated with a youthful sun.
Q133: Who proposed the Planetesimal Hypothesis?
1. Kant-Laplace
2. Chamberlin-Moulton
3. Hubble-Hoyle
4. Jeans-Jeffrey
Show Answer
Answer: 2
Explanation: The Planetesimal Hypothesis was put forward by Chamberlin and Moulten in 1905. This theory explains not only the origin of Earth but also that of oceans and atmosphere.
Q134: Who among the following proposed the Tidal Hypothesis of the origin of Earth and Solar system?
1. Hoyle-Lyttleton
2. Kant-Laplace
3. Chamberlin-Moulton
4. Jeans-Jeffreys
Show Answer
Answer: 4
Explanation: The Tidal Hypothesis was proposed by James Jeans and Harold Jeffreys. This theory explains the origin of the earth and the solar system.
Q135: Who proposed the Binary Star Hypothesis?
1. Chamberlin
2. Russel
3. Kant
4. Laplace
Show Answer
Answer: 2
Explanation: The Binary Star Hypothesis was put forward by H.N. Russel in the year 1937. It was propounded to overcome the shortcomings of the Tidal Hypothesis theory of Jeffreys.
Q136: Who put forward the Cepheid hypothesis?
1. Laplace
2. A.C. Banerji
3. James Jeans
4. Hannes Alfven
Show Answer
Answer: 2
Explanation: A.C. Banerji proposed the Cepheid Hypothesis on the origin of the solar system in 1942.
Q137: Which Hypothesis was put forward by F. Hoyle and Lyttleton?
1. Nebular Hypothesis
2. Cepheid Hypothesis
3. Interstellar Dust Hypothesis
4. Nova Hypothesis
Show Answer
Answer: 4
Explanation: F. Hoyle and Lyttleton put forward the Nova Hypothesis. According to this theory, the solar system originated through the Supernova Explosion.
Q138: Which among the following is related to the Fission Hypothesis?
1. Mountains
2. Volcanoes
3. Universe
4. Moon
Show Answer
Answer: 4
Explanation: The Fission Hypothesis proposes that the moon was once a part of the planet earth. However, due to the rapid rotation of Earth, the moon broke away from it.
Q139: Which theory of the origin of the Moon is also called the Double Planet Theory?
1. Capture theory
2. Binary accretion theory
3. Fission theory
4. Steady-state theory
Show Answer
Answer: 2
Explanation: The Binary Accretion theory is also called the Double planet theory. According to this theory, the moon formed in the orbit around the earth but not out of the material drawn from the earth. Both sides of the moon formed at around the same time out of the same swarm or cloud of material.
Q140: Who proposed the fission model of the origin of the moon?
1. A.C. Banerji
2. George Darwin
3. Kant
4. Laplace
Show Answer
Answer: 2
Explanation: The Fission model was proposed by George Darwin. According to this theory, the Moon is gradually moving away from the Earth, which means that it was a part of the Earth in the past but flung outward due to the Earth’s then faster rotation.
Q141: The Giant Impact Hypothesis is related to which of the following?
1. Moon
2. Universe
3. Earth
4. Sun
Show Answer
Answer: 1
Explanation: The Giant Impact Hypothesis was proposed in 1984. It explains the origin of the Moon.
Q142: Which astrophysicist proposed the Band-structure model?
1. Otto Schmidt
2. Hannes Alfven
3. Ray Lyttleton
4. F. Hoyle
Show Answer
Answer: 2
Explanation: Hannes Alfven proposed the Band-structure model. He explained the origin of planets using electromagnetism.
Q143: The Big Splat theory is related to the origin of which among the following?
1. Moon
2. Sun
3. Volcanoes
4. Universe
Show Answer
Answer: 1
Explanation: The Big Splat theory, also called the Big Splash, states that an object the size of Mars collided with the early Earth to form the Moon.
Q144: Which among the following theories of the origin of Earth and their theorists is correctly matched?
1. Nebular Hypothesis – Jeffreys
2. Binary star theory – Russel
3. Planetesimal Hypothesis – Laplace
4. Tidal Hypothesis – Holmes
Show Answer
Answer: 2
Explanation: The Binary star hypothesis was given by Russel.
Nebular Hypothesis – Laplace
Planetesimal Hypothesis – Chamberlin
Tidal Hypothesis – Jeffreys
Q145: Which among the following theories is not related to the origin of the moon?
1. Big splat theory
2. Capture theory
3. Binary Star theory
4. Accretion theory
Show Answer
Answer: 3
Explanation: The Binary star hypothesis is related to the origin of planets. The theories of the moon include the Big splat theory, capture theory, and accretion theory.
Q146: Which among the following theories of the origin of Earth was proposed by Immanuel Kant?
1. Binary star theory
2. Tidal hypothesis
3. Planetesimal Hypothesis
4. Nebular Hypothesis
Show Answer
Answer: 4
Explanation: Immanuel Kant, a German philosopher, proposed the Nebular Hypothesis on the origin of Earth in 1755.
Q147: The collision of which protoplanet to Earth is related to the formation of the Moon?
1. Terra
2. Tellus
3. Gaea
4. Theia
Show Answer
Answer: 4
Explanation: The Giant Impact Hypothesis explains the formation of the Moon from the colossal impact of the protoplanet called Theia with Earth.
Q148: Who suggested that the Emerging moon was the cause of the continental drift?
1. Arthur Holmes
2. Laplace
3. Immanuel Kant
4. Otto Ampherer
Show Answer
Answer: 4
Explanation: The geologist Otto Ampherer suggested that the emerging moon was the cause of the continental drift. Accordingly, the Pacific Ocean represented that scar.
Q149: Who suggested that the Moon may have formed because of the nuclear explosion?
1. George Darwin
2. Otto Ampherer
3. James Jeans
4. Rob de Meijer
Show Answer
Answer: 4
Explanation: Rob de Meijer and Wim Van Westrenen suggested that the moon may have formed due to the nuclear explosion caused by the centrifugal force of the earlier spinning proto-Earth.
Q150: Which among the following is not an alternative name for the Moon?
1. Gaia
2. Luna
3. Selene
4. Cynthian
Show Answer
Answer: 1
Explanation: Moon is also called Luna, Selene, and Cynthian. Gaia is an alternative name for Earth.
