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

Answer: (d)

Greenwich Mean Time is the standard time for time assessment in different countries of earth. The countries which lie east of the Greenwich line are ahead of Greenwich Mean Time while the countries which lie west of Greenwich have their standard time behind the Greenwich Mean Time.

So, the correct sequence of the countries are Japan, Iraq, Greece, Cuba and Costa Rica.

Answer: (b)

The group of small pieces of rocks revolving round the sun between the orbits of mars and Jupiter are called Asteroids.

Answer: (a)

At the time of the solar eclipse, it is not the shadow of the earth that is visible on the surface of the sun.

The solar eclipse occurs when the moon comes between the sun and the earth. The shadow of the earth is visible during the lunar eclipse.

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: (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: (a)

Because it is “tidally-locked” to the Earth. The Earth’s gravity slows down the moon’s rotation so that it rotates at the same speed as it revolves around the Earth.

Imagine a person who walks around a center pole, but shifts their body so they are always facing it as they walk.