universe & solar system section 7 MCQ Questions & Answers Detailed Explanation

Answer: (d)

The Blue Moon phenomenon occurs when two full moons occur in the same month. A blue moon is an extra full moon that appears in a subdivision of a year, either the third of four full moons in a season or, recently, a second full moon in a month of the common calendar.

The phrase has nothing to do with the actual color of the moon, although a literal “blue moon” (the moon appearing with a tinge of blue) may occur in certain atmospheric conditions; e.g., when there are volcanic eruptions or when exceptionally large fires leave particles in the atmosphere.

Answer: (d)

The black part of the moon is called the sea of tranquility. Sea of tranquility is not an actual sea but rather the point at which Apollo 11 first landed when it reached the moon. It is a lunar mare that mainly consists of basalt rock and is located on the Tranquilitatis basin which is on the Moon.

The mare has a tint that is slightly blue in color and stands out from the rest of the moon.

Answer: (b)

Eclipse of the moon occurs when the moon comes between the sun and the earth and it causes the shadow of the moon to fall on earth. A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow).

This can occur only when the Sun, Earth, and Moon are aligned (in “SYZYGY”) exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a full moon.

Answer: (d)

The sun is the heart spot of the solar system which is the source of energy of all organisms of the earth. The Sun produces energy by the nuclear fusion of hydrogen into helium in its core.

It means that, since there is a huge amount of hydrogen in the core, these atoms stick together and fuse into a helium atom. This energy is then radiated out from the core and moves across the solar system.

Answer: (a)

Answer: (d)