1.Titan is the largest moon of the planet
A. Mars
B. Venus
C. Jupiter
D. Saturn
Titan is the largest moon of Saturn and is also the second-largest moon in the entire solar system. It is known for its thick atmosphere and is the only Moon in our solar system with a substantial atmosphere.
Titan's atmosphere contains primarily nitrogen, along with various other gases. The presence of an atmosphere and other the Earth-like features on Titan has made it a target of interest for scientific study, including the exploration carried out by the Cassini-Huygens Mission (by NASA).
2. Which of the given two planets are between Mars and Uranus in order of distance from the Sun?
A. Earth and Jupiter
B. Jupiter and Saturn
C. Saturn and Earth
D. Saturn and Neptune
Jupiter and Saturn are the planets that lies between Mars and Uranus. The order of the planets in the solar system, starting from nearest to the Sun and going outwards are as follows; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Jupiter is the largest of all the planets. Saturn is the second largest planet.
3. Hydrogen, helium and methane are the main gases present on
A. Uranus, Neptune and Pluto
B. Jupiter, Saturn and Mars
C. Uranus, Neptune and Venus
D. Mars and Venus
Hydrogen, helium and methane are the main gases present on Jupiter, Saturn and Mars.
The atmosphere of Jupiter is the largest planetary atmosphere in the solar system. It is mostly made of molecular hydrogen and helium in roughly solar proportions, other chemical compounds are present only in small amounts.
Saturn is not solid like Earth, but is instead a giant gas planet. It is made up of hydrogen ( 
), helium ( ) and small amounts of methane and ammonia.
The martian (Mars) atmosphere consists of approximately carbon dioxide ( ), argon ( ), nitrogen ( ) and traces of free oxygen, carbon monoxide, water and methane, among other gases.
4. The coldest planet in the solar system is
A. Neptune
B. Jupiter
C. Mars
D. Saturn
Among the given options, Neptune is the coldest planet in the solar system. As the planets in our solar system get further away from the Sun, they generally get colder.
Among all the planets, Uranus is the coldest. Its atmosphere makes it the coldest planet with temperature of 
. Uranus is the seventh planet from the Sun and has the third largest diameter in our solar system.
5. According to a new definition adopted by 'International Astronomical Union' in 2006, which of the following is not a 'Planet'?
A. Uranus
B. Neptune
C. Pluto
D. Jupiter
Pluto is not a planet according to a new definition adopted by International Astronomical Union (IAU) in 2006.
The IAU downgraded the status of Pluto to that of a Dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet.
These are
(i) It must orbit a star
(ii) It must be big enough to have enough gravity to force it into a spherical shape
(iii) It must be big enough that its gravity cleared away any objects of a similar size near its orbit around the Sun.
6. Which planet takes the longest period in revolving around the Sun?
A. Uranus
B. Jupiter
C. Neptune
D. Pluto
Pluto, although no longer classified as a full-fledged planet, takes the longest period in revolving around the Sun compared to the other options provided.
Pluto's orbit is highly elongated and tilted compared to the major planets in the solar system. It takes about 248 Earth's years to complete one orbit around the Sun. After declassification of pluto from the list of planet, Neptune takes the longest period in revolving around the Sun.
7. Who amongst the following was the first to state that the Earth was spherical?
A. Aristotle
B. Copernicus
C. Ptolemy
D. Strabo
In ancient Greece, Aristotle (384-322 BCE)
was one of the first known individuals to propose that the Earth was spherical. He provided several arguments for this idea, including observations of the way ships disappeared over the horizon and the curved shape of Earth's shadow during lunar eclipses.
8.The Spacecraft 'Magellan' was sent to
A. Pluto
B. Saturn
C. Mars
D. Venus
The Spacecraft 'Magellan' was sent to Venus.
It also referred to as the 'Venus Radar Mapper', robotic space probe launched by NASA on 4th May, 1989, to map the surface of Venus by using synthetic aperture radar and to measure the planetary gravitational field. The Magellan probe was the first Interplanetary Mission to be launched from the Space Shuttle.
9. Which one of the following stars is nearest to the Earth?
A. Polaris
B. Alpha Centauri
C. Sun
D. Sirius
Among the following options the nearest star to the Earth is the Sun. It provides light, heat, and energy essential for life on the Earth. It is the centre of solar system. It is made up of extremely hot gases. It is about 150 million km away from Earth.
10. Assertion (A) Moving from one place on Earth to another place of high latitude, the weight of an object decreases.
Reason (R) Earth is not a perfect sphere.
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(A).
C. (A) is true but (R) is false.
D. (A) is false but (R) is true.
Assertion (A) is false but Reason (R) is true.
Moving from one place on the Earth to another place of high latitude, the weight of an object does not decrease due to latitude alone. Weight is the force exerted by gravity and it depends on the mass of the object and the local acceleration due to gravity, which is influenced by the distance from the Earth's centre.
Earth is not a perfect sphere, it is an oblate spheroid, slightly flattened at the poles and bulging at the equator.
This variation in the Earth's shape does influence the acceleration due to gravity at different latitudes, but it doesn't cause a significant change in an object's weight during normal travel from one high latitude place to another.
11. In completing one revolution of the Sun, Earth takes approximately
A. 365 days
B. 365.25 days
C. 365.5 days
D. 365.75 days
In completing one revolution of the Sun, Earth takes approximately 365.25 days. This is the approximate time it takes for the Earth to complete one revolution around the Sun, which is also known as a sidereal year. A sidereal year is measured by the time it takes for the Earth to return to the same position in relation to the fixed stars.
12. A ball thrown outside from an artificial satellite revolving around the Earth will
A. go to the Sun
B. go to the Moon
C. fall on the Earth
D. revolve around the Earth in the same orbit with the same time period as satellite
A ball thrown outside from an artificial satellite revolving around the Earth will revolve around the Earth in the same orbit with the same time period as satellite.
This is because the ball will have the same orbital velocity and altitude as the satellite and thus will follow the same orbital path. The ball will not go to the Sun, the Moon, or fall on the Earth, unless it is thrown with a very high speed or in a different direction that changes its orbital parameters. The ball and the satellite will act as two independent bodies orbiting the Earth under the influence of gravity.
13. Consider one special point at the Earth's surface (e.g., City Delhi) its temperature at noon (e.g., 12 O'clock) will be higher in summer in comparison to winter because
A. the Earth is much closer to the Sun in summer in comparison to winter.
B. in winter the Sun rays falling on the Earth bends more towards the Earth's surface in comparison to summer.
C. the vaporisation of water happen only in winter due environmental precipitation.
D. in winters the Earth's axis becomes more inclined towards the Sun.
In winter, the tilt of the Earth's axis causes sunlight to hit the Earth's surface at a more oblique angle. This means that the same amount of sunlight is spread over a larger area, leading to lower temperatures. In summer, the tilt of the Earth's axis results in sunlight hitting the Earth's surface more directly, concentrating the same amount of energy over a smaller area and leading to higher temperatures. The Earth's axis is tilted at an angle of 
relative to the plane of its orbit around the Sun.
14. The duration of its day and tilt of its axis are almost identical to those of the Earth. This is true of
A. Uranus
B. Neptune
C. Saturn
D. Mars
The duration of Mars day and its tilt of its axis are almost identical to those of the Earth. In several ways, Mars is similar to the Earth. The Red planet spins on its axis with a rate and tilt that are almost identical of the Earth. Surface markings on Mars have long allowed astronomers to determine the planet's rotation period. It rotates once on its axis every 24.62 hr , so the day on Mars is only 37 min longer than the Earth. Mars rotational axis is inclined to its orbital plane. It is tilted at 
, almost similar to that of Earth at .
15. Consider the following statements.
oxygen and no carbon dioxide.Select the correct answer by using the codes given below.
A. Only 1
B. 2 and 3
C. 1 and 3
D. 1,2 and 3
Statements (1) and (3) are correct.
The Earth's magnetic field has reversed every few hundred thousand years. These reversals are random with no apparent periodicity to their occurrence. They can happen as often as every 10 thousand years or so and as infrequently as every 50 million years or more. The autotrophs started the process of photosynthesis which lead to the release of free oxygen in the atmosphere. In the upper layers of the atmosphere, this free oxygen led to the formation of Ozone. These living organisms modified the early atmosphere of the Earth.
Statement (2) is incorrect regarding the Earth and its evolution. Earth is approximately (5 billion years) old. The earlier environment had an absence of free oxygen. Around 4 billion years ago, water vapour present in the atmosphere condensed to form the hydrosphere.
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