universe & solar system section 6 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Answer: (d)

Answer: (b)

The outermost layer of the sun is called the corona. A corona is a type of plasma that surrounds the Sun and other celestial bodies.

The Sun’s corona extends millions of kilometers into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph.

Answer: (d)

Asteroids are rocky debris of varying sizes orbiting the Sun. They are generally small but some have a diameter of 1000 km. Asteroids are minor planets whose orbits lie between Jupiter and Mars.

These are said to be the fragments of a larger planet disrupted long ago. Their number is estimated to be 30,000 pieces of rocky debris out of which more than half are known.

Answer: (d)

The distance of the moon from the Earth is 364 thousand km. The Moon is the only natural satellite of the Earth and the fifth largest moon in the Solar System.

It is the largest natural satellite of a planet in the Solar System relative to the size of its primary, having 27% the diameter and 60% the density of Earth, resulting in 1/81 its mass.

Answer: (a)

Continental Drift and Glacial Cycles have influenced the evolution of organisms. Continental drift is the movement of the Earth’s continents relative to each other by appearing to drift across the ocean bed.

A glacial period is an interval of time within an ice age that is marked by glacier advances.