1.Which one of the following is known as 'Morning Star'?
A. Mercury
B. Venus
C. Mars
D. Saturn
Venus is often referred to as the Morning Star' when it appears in the Eastern sky just before sunrise. It's also called the 'Evening Star' when it appears in the Western sky just after sunset. This is because Venus is one of the brightest objects in the sky and it's visible during the early morning hours before the Sun rises or in the early evening after the sunsets.
2. The planet which is called 'Twin Sister of the Earth' is
A. Mercury
B. Venus
C. Mars
D. Pluto
Venus is sometimes called the "Twin Sister of the Earth' because it is similar in size and composition to the Earth. It's often considered the Earth's twin due to its similar mass, size and rocky composition.
However, despite these similarities, Venus has a very harsh and extreme environment with a thick, toxic atmosphere and extremely high surface temperatures, making it very different from the Earth in terms of habitability.
3. Assertion (A) Existence of human life on Venus is highly improbable.
Reason (R) Venus has an extremely high level of carbon dioxide in its atmosphere.
Codes
A. Both (A) and (R) are true and (R) is the correct explanation of (A).
B. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
C. (A) is true, but (R) is false.
D. (A) is false, but (R) is true.
Both Assertion (A) and Reason (R) are true and Reason 
is the correct explanation of Assertion (A).
Venus has an atmosphere that is overwhelmingly composed of carbon dioxide with a pressure about 92 times that of Earth's atmosphere at its surface. This thick carbon dioxide-rich atmosphere creates a strong greenhouse effect, trapping heat and leading to extremely high surface temperatures on Venus. The average surface temperature on Venus is around , which is hotter than the surface of Mercury despite Venus being further from the Sun.
This extreme temperature, along with the dense, acidic clouds and the inhospitable conditions caused by the greenhouse effect, makes it highly improbable for human life to exist on Venus.
4. Which of the following pairs of planets is without satellites?
A. Venus and Mars
B. Mercury and Mars
C. Earth and Jupiter
D. Mercury and Venus
Mercury and Venus are the only planets in solar system, which do not have any natural satellite. The Earth has one natural satellite, while Mars has two natural satellites.
NASA's mercury orbiting probe, (Messenger), has confirmed a vast amount of ice at the North Pole on Mercury. Mercury's North Pole is always in shadows. Saturn has 146 moons and Jupiter has 95 moons.
5. Which one of the following conditions is most relevant for the presence of life on Mars?
A. Atmospheric composition
B. Thermal conditions
C. Occurrence of ice cap and frozen water
D. Occurrence of ozone
Occurrence of ice cap and frozen water is the most relevant condition for the presence of life on Mars. Scientists discovered a slab of ice as large as California and Texas combined in the region between the Equator and North Pole of the Red planet Mars.
The European Space Agency's Mars Express Spacecraft captured images of sheets of ice in the cooler, shadowed bottoms of craters, which suggests that liquid water can pool under appropriate conditions.
6. Which one of the following may have alien life because of a very conductive environment of life?
A. Jupiter
B. Mars
C. Europa-The Jupiter's Moon
D. Moon-The Earth's Moon
Europa-The Jupiter's Moon may have alien life because of a very conductive environment of life. Various studies suggests that Jupiter's Moon Europa might be able to support life even if there's little or no volcanic activity under the satellite's icy shell. Eventhough, Europa has a very thin oxygen atmosphere, it is considered as one of the most promising places in the solar system to find present day environment that are suitable for life beyond the Earth.
Europa is 6th largest moon in the solar system, it is slightly smaller than Earth's moon.
7. The Moons of the planet Jupiter were discovered by
A.
B.
C.
D.
Galileo Galilei, the Italian astronomer, was the first to observe and document the four largest Moons of Jupiter, now known as the Galilean Moons: Lo and Europa, Ganymede and Callisto.
He made these groundbreaking observations using a telescope in 1610. This discovery provided significant evidence against the geocentric model of the universe and supported the heliocentric model proposed by Copernicus.
8. The ring of Jupiter is composed of
A. silicates
B. non-existent
C. very thick and opaque
D. All of these
The ring of Jupiter is composed mainly of silicates. The planet Jupiter has a system of rings known as the ‘Rings of Jupiter’ or the Jovian Ring System. It was the third ring system to be discovered in the solar system after Saturn and Uranus. The Jovian Ring System is faint and consists mainly of dust i.e., silicates.
Maximum number of rings are possessed by Saturn, which is seven and Jupiter's Ring System is composed of four rings. There are four planets in our solar system that have rings. These are; Jupiter, Saturn, Uranus and Neptune.
9. Methane is present in the atmosphere of
A. Moon
B. Sun
C. Jupiter
D. Mars
Methane is present in the atmosphere of Jupiter.
Jupiter's atmosphere contains mainly helium and hydrogen with trace amounts of water, ammonia, methane and other carbon compounds.
Methane is abundant on Titan and plays a key role in maintaining its thick nitrogen atmosphere. Titan is largest moon of Saturn.
10. Among the following, which planet takes maximum time for one revolution around the Sun?
A. Earth
B. Jupiter
C. Mars
D. Venus
Jupiter takes around 12 years for one revolution, which is maximum time taken by any planet in the given options.
Revolution period of various planets are; Mercury ( 87.97 days), Venus ( 224.7 days), Earth ( 365.26 days), Mars (1.88 years), Jupiter (11.86 years), Saturn (29.46 years), Uranus (84.01 years), Neptune (164.79 years).
11. Which one of the following is the heaviest planet of our solar system?
A. Jupiter
B. Venus
C. Pluto
D. Saturn
Jupiter is the heaviest planet in the solar system, with a mass of ( 
). The gas giant's mass is equivalent to about 318 times bigger than the Earth. Jupiter is so heavy that it's about two and a half times the mass of all the other planets in the solar system combined.
12. The atmosphere of Saturn contains which one of the following gases in large quantity?
A. Nitrogen
B. Carbon monoxide
C. Methane
D. Sulphur dioxide
Atmosphere of Saturn contains methane gas in large quantity. Saturn consists mainly of hydrogen and helium. Its atmosphere has methane and a temperature of 
. It is also made up of hydrogen cyanide, which is a highly poisonous gas. Saturn has highest number of Moons (82) among all planets.
13. Which of the following planets has the least density?
A. Earth
B. Mars
C. Venus
D. Saturn
Saturn has the lowest density of all the planets in our solar system.
It's density is lesser than water. Saturn has the density of 
, while the Earth has the highest density of in our solar system.
14. Which of the following planets has rings around it
A. Saturn
B. Mars
C. Mercury
D. Earth
Saturn is known for its prominent ring system, which consists of numerous ring segments made up of ice particles and dust. These rings are visible from the Earth through telescopes and give Saturn its distinctive and striking appearance. No other planet in our solar system has such a prominent and extensive ring system.
15. Planet Saturn
A. is colder than Pluto
B. is colder than Neptune
C. warmer than Neptune
D. warmer than Jupiter
Saturn is actually warmer than Neptune. Despite being located farther from the Sun, Saturn has a slightly higher internal temperature due to its gravitational contraction and the heat generated during its formation.
On the other hand Neptune is much colder because it is located in the outer region of the solar system, where sunlight is much weaker.
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