The Universe Part-3

Total Questions: 51

41. Which of the following planets has rings around it - [U.P.P.C.S. (Pre) 1990]

(a) Saturn
(b) Mars
(c) Mercury
(d) Earth

Correct Answer: (a) Saturn

Solution:Saturn is especially famous for its peculiar feature of rings. Total seven rings of Saturn has been discovered. It's A,B, D and E rings can be seen from earth. The colour of Saturn from earth seems yellow. Besides Saturn, Jupiter, Uranus and Neptune too have rings.

42. After seven years of its journey spacecraft Cassini started its revolution in June-2004 around which planet- [U.P.P.C.S. (Mains) 2004]

(a) Mercury
(b) Jupiter
(c) Mars
(d) Saturn

Correct Answer: (d) Saturn

Solution:On October 15, 1997 the Cassini spacecraft was launched to the Saturn and began its revolution around this planet in June 2004. Cassini was one of the largest interplanetary spacecraft. The Cassini orbiter weighed 2,125 kg (4,685 pounds) and was 6.7 metres (22 feet) long and 4 metres (13 feet) wide. The instruments on board Cassini included radar to map the cloud-covered surface of Titan and a magnetometer to study Saturn's magnetic field. The disk-shaped Huygens probe was mounted on the side of Cassini. It weighed 349 kg (769 pounds), was 2.7 metres (8.9 feet) across, and carried six instruments designed to study the atmosphere and surface of Titan.

43. Planet Saturn- [U.P.P.C.S. (Pre) 2010]

(a) Is colder than Pluto
(b) Is colder than Neptune
(c) Warmer than Neptune
(d) Warmer than Jupiter

Correct Answer: (c) Warmer than Neptune

Solution:The Saturn is warmer than Neptune. According to the distance sequence of planets from the Sun (Mercury-Venus-Earth- Mars-Jupiter-Saturn-Uranus-Neptune), Saturn is closer to the Sun than Nepture. Therefore Saturn will be warmer in comparison to Neptune, but Venus is warmer than mercury due to high concentration of CO, in its atmosphere.

44. Titan is the largest moon of the planet- [U.P.U.D.A./L.D.A. (Pre) 2006]

(a) Mars
(b) Venus
(c) Jupiter
(d) Saturn

Correct Answer: (d) Saturn

Solution:Titan is the largest moon (natural satellite) of Saturn. The diameter of Titan is 5,150 km. Prominent satellite of Saturn is Atlas, Epimetheus, Tethys, Lapetus, Dione, Phoebe, Helene and Enceladus, etc. Rhea is, second largest natural satellite of Saturn, having the diameter of about 1,528 km.

45. Which of the following statements are correct regarding the solar system? [Chhattisgarh P.C.S. (Pre) 2020]

1. Mercury is the hottest planet in the solar system.

2. Ganymede, satellite of Saturn, is the largest satellite in the solar system.

3. Neptune is surrounded by methane gas rings of sub-zero temperature.

4. Phobos and Deimos are two satellites of Mars

(a) Only 1 and 2 are correct
(b) Only 2 and 3 are correct
(c) Only 3 and 4 are correct
(d) 1, 2, 3 and 4 all are correct

Correct Answer: (c) Only 3 and 4 are correct

Solution:The hottest planet in the Solar System is Venus. It's mean temperature is 464°C. Jupiter's satellite Ganymede is the largest Satellites in the Solar System. Phobos and Deimos are the two satellites of Mars. Neptune is surrounded by rings of Methane gas at subzero temperatures. Due to this, the colour of Neptune appears to be Blue-Green.

46. For one revolution around the Sun, Uranus takes - [44th B.P.S.C. (Pre) 2000]

(a) 84 years
(b) 36 years
(c) 18 years
(d) 48 years

Correct Answer: (a) 84 years

Solution:Uranus's period of revolution around the Sun is 84 years. A day on Uranus is approximately 17 hours and 14 minutes. In 1781, William Herschel, a German-born British astronomer, discovered Uranus with a telescope. This made Uranus the first planet to be found using this technology. Uranus is the third largest planet in our solar system. Uranus spins on its side, almost 90 degrees compared to other planets, which creates unique seasons and extreme weather. Uranus is one of the coldest planets, with temperatures dropping to around -224 degrees Celsius. Due to extreme cold, pressure, and atmospheric conditions, Uranus is unlikely to support life as we know it.

47. The year is largest on [39th B.P.S.C. (Pre) 1994]

(a) Pluto
(b) Jupiter
(c) Neptune
(d) Earth

Correct Answer: (a) Pluto

Solution:

The year is largest on Pluto because it is farthest among the other celestial objects from the Sun. Pluto takes the period of 247.9 earth year to complete one revolution around the Sun.

48. Which planet takes the longest period in revolving around the Sun ? [U.P. Lower Sub. (Spl) (Pre) 2004]

(a) Uranus
(b) Jupiter
(c) Neptune
(d) Pluto

Correct Answer: (d) Pluto

Solution:Neptune takes the longest period to make a revolution around the Sun. As we know that planet Pluto has been removed from the category of planets since 2006. Now starting from the Mercury up to Neptune only 8 planet comes into the category of true planets. The time period of revolution of all four planets is given below -

Planet	Diameter (km)
Mercury	4,879 km
Venus	12,104 km
Earth	12,756 km
Mars	6,792 km
Jupiter	142,984 km
Saturn	120,536 km
Uranus	51,118 km
Neptune	49,528 km

49. The coldest planet in the solar system is - [M.P.P.C.S. (Pre) 2014]

(a) Neptune
(b) Jupiter
(c) Mars
(d) Saturn

Correct Answer: (a) Neptune

Solution:Neptune which is farthest from the Sun, is the coldest planet of our solar system. The temperature of Neptune's surface is -200° C and its atmosphere is made up of Hydrogen, Helium and Methane.

50. Which of the following planets is the farthest planet of the solar system - [I.A.S. (Pre) 2002, I.A.S. (Pre) 2005]

(a) Neptune
(b) Pluto
(c) Some times Neptune and some times Pluto
(d) Mars

Correct Answer: (c) Some times Neptune and some times Pluto

Solution:Generally, Pluto is considered as the farthest planet from the Sun. As its orbit lies inside the orbit of Neptune, some times Neptune becomes the farthest planet from Sun. Neptune was farthest from 1979 to 1999 but from 11th February, 1999. Pluto will be the farthest planet for the next 228 years. Hence, it can be seen that some time Pluto and some time Neptune becomes the farthest planet from Sun. As in 2006, Pluto was declared a dwarf planet, hence now Neptune is the correct answer for this question.

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