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51
Among the following which planet takes maximum time for one revolution around the Sun?
Discuss
Answer & Solution
Answer: Option B
Solution:
Jupiter revolves or orbits around the Sun once every 11.86 Earth years, or once every 4,330.6 Earth days.
52
The only planet whose period of rotation is longer than the period of revolution around the Sun?
Discuss
Answer & Solution
Answer: Option C
Solution:
Venus takes 243 Earth days to rotate on its axis whereas it takes 224.7 Earth days to revolve round the Sun.
53
The planet with the maximum number of satellites is ________.
Discuss
Answer & Solution
Answer: Option C
Solution:
We need to figure out which of these planets has the most moons.

Option A: Uranus is a large, icy planet, but it doesn't have the most moons.
Option B: Jupiter is a giant planet known for its Great Red Spot and has many moons.
Option C: Saturn is famous for its beautiful rings, and it also has a large number of moons. Currently, Saturn has the maximum number of satellites.
Option D: Neptune is another icy giant planet, but it has fewer moons than Saturn.

Therefore, the correct answer is C: Saturn.
54
The outermost layer of Sun is called ________
Discuss
Answer & Solution
Answer: Option D
Solution:
The atmosphere of the sun is composed of several layers, mainly the photosphere, the chromosphere and the corona. It's in these outer layers that the sun's energy, which has bubbled up from the sun's interior layers, is detected as sunlight. The lowest layer of the sun's atmosphere is the photosphere.
55
Which of the following celestial bodies is located farthermost to the Earth?
Discuss
Answer & Solution
Answer: Option D
Solution:
After 26th General Assembly of International Astronomical Union held in 2006 in Prague (Czech Republic), Pluto was categorised as 'Dwarf Planet'. Its orbit around the Sun larger than the other 3 given planets. Sometimes Neptune is far from sun and sometimes Pluto , before 1999 Neptune was the farthest planet but after 1999 Pluto is the farthest planet for next 238 years .
56
In how many parts the shadow of Earth is divided during solar or lunar eclipse?
Discuss
Answer & Solution
Answer: Option D
Solution:
In a solar or lunar eclipse, the region of earth's shadow is divided into three parts. The three parts are – Umbra, Penumbra and Antumbra.
57
Which one of the following is correct?
Great Bear is a ________
Discuss
Answer & Solution
Answer: Option D
Solution:
Ursa Major is a constellation in the northern sky, whose associated mythology likely dates back into prehistory. Its latin name means "greater she-bear", standing as a reference to and in direct contrast with nearby Ursa Minor, the lesser bear.
58
In astrophysics, what is the name of hole in outer space which emits stars and energy?
Discuss
Answer & Solution
Answer: Option D
Solution:
In astrophysics, it is a hypothetical concept. In this theory white hole which is opposite to black hole emits stars and energy. In general relativity, a white hole is a hypothetical region of spacetime which cannot be entered from the outside, although matter and light can escape from it. In this sense, it is the reverse of a black hole, which can only be entered from the outside and from which matter and light cannot escape.
59
The Srnith-tuttle comet will crash with Earth in ________
Discuss
Answer & Solution
Answer: Option C
Solution:
In 2126 it will be a bright naked-eye comet reaching about apparent magnitude 0.7.
60
Which is the nearest planet to Sun?
Discuss
Answer & Solution
Answer: Option B
Solution:
Mercury is the closest planet to the Sun, orbiting at an average distance of 57.9 million km.