Correct Answer:
(A)
A. Mercury
Mercury is the smallest planet in our solar system. It's also the closest planet to the Sun. Mercury is slightly larger than the moon.
Ques:
12
Which of the following pairs of planets is without satellites?
Correct Answer:
(B)
b) Mercury and Venus
Mercury and Venus are the only planets in our solar system without any natural satellites or moons. All other planets have at least one moon orbiting them. Earth has one moon (the Moon), Mars has two small moons (Phobos and Deimos), and the gas giants (Jupiter, Saturn, Uranus, and Neptune) all have multiple moons.
Ques:
13
Which one of the following statements is correct with reference to our solar system?
Correct Answer:
(A)
The Earth is the densest of all the planets in our solar system
The average density of Earth is highest among all the other eight planets of our Solar System. It is 5.514 gm/cm3 . The density of other planets is as follows (Unit–gm/ cm3 ) Mercury (5.42), Venus (5.24), Mars (3.93), Jupiter (1.32), Saturn (0.68) Uranus (1.27), Neptune (1.63). Thus statement (a) is correct. The largest constituent element of earth is Iron (32.07%). Oxygen (30.12%) is the second and Silicon (15.12%) is the third largest element in the composition of Earth. The sun comprises 99.8% mass of the solar system. The diameter of the sun is about 109 times the Earth's diameter.
Ques:
14
The number of the planet in the solar system is –
Correct Answer:
(C)
8
Our solar system is made up of a star—the Sun and eight planets, 146 moons, a bunch of comets, asteroids and space rocks, ice, and several dwarf planets, such as Pluto. The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Mercury is closest to the Sun. Neptune is the farthest.
Increasing order of distance from the sun, as follows :
(i) Mercury (57.9 million Km.)
(ii) Venus (108.2 million Km.)
(iii) Earth (149.6 million Km.)
(iv) Mars (227.9 million Km.)
(v) Jupiter (778.6 million Km.)
(vi) Saturn (1433.5 million Km.)
(vii) Uranus (2872.5 million Km.)
(viii) Neptune (4495.1 million Km.)
Ques:
15
Which is true about planets ?
Correct Answer:
(B)
Planets shine though they are non-luminous bodies
Planets are a non-luminous body but they shine because they reflect the light of the Sun. Thus option (b) is correct.
Ques:
16
Which of the following pairs is not properly matched ?
Correct Answer:
(D)
The slowest moving planet Solar System - Mars
All of the given options are true, except option (d) because the slowest moving planet of the solar system is Neptune. It takes 165 years to complete one revolution around the sun.
Ques:
17
Arrange the following in decreasing order of size and select the correct answer from the codes given below :
1. Jupiter 2. Uranus
3. Earth 4. Saturn
Code :
Correct Answer:
(C)
1, 4, 2, 3
The decreasing order of the size of given planets is as follows– Jupiter > Saturn > Uranus > Earth. Size of planets in decreasing order is as follows. Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury.
Ques:
18
'The term 'Goldilocks Zone' is often seen in the news in the context of
Correct Answer:
(C)
Search for the Earth-like planets in outer space.
In Astronomy, the circumstellar habitual zone is also called 'Goldilocks Zone'. It refers to the habitable zone around a star where the temperature is just right- not too hot and not too cold for liquid water to exist on a planet. Earth is the only planet inhabiting life in the entire solar system. It is the only planet situated in the Goldilocks zone of the solar system.
Ques:
19
Which of the following statements are correct regarding the solar system?
Mercury is the hottest planet in the solar system
Ganymede, satellite of Saturn, is the largest satellite in the solar system
Neptune is surrounded by methane gas rings of sub-zero temperature
Phobos and Deimos are two satellites of Mars
Correct Answer:
(C)
Only III and IV are correct
Venus is the hottest planet in the solar system, not Mercury. This is, because its dense atmosphere acts as a greenhouse and heats the surface to about 464ºC). Ganymede is the largest satellite in the solar system, but it is a satellite of Jupiter, not Saturn. Neptune is surrounded by methane gas rings of sub-zero temperature. Mars has two small moons : Phobos and Deimos. The moons get their names from the horses that pulled the chariot of the Greek god of war, Ares.
Ques:
20
The group of stars that indicates the direction of pole, is
Correct Answer:
(A)
Saptarishi
Saptarishi is a group of stars that indicate the direction of the pole. Hence, option (a) is the correct answer.