universe & solar system section 9 MCQ Questions & Answers Detailed Explanation

Answer: (a)

Transformation of solar energy into heat requires some time, energy received by the earth from solar radiations continues to exceed the energy lost by outgoing long-wave radiations from the earth’s surface from 4.00p.m.

Answer: (b)

The corona is the outermost layer of the Sun, starting at about 1300 miles (2100 km) above the solar surface (the photosphere).

The temperature in the corona is 500,000 K (900,000 degrees F, 500,000 degrees C) or more, up to a few million K. The corona cannot be seen with the naked eye except during a total solar eclipse.

The corona does not have an upper limit.

Answer: (b)

Jupiter was named after the Roman God Zeus. Zeus is the “Father of Gods and men” who rules the Olympians of Mount Olympus as a father rules the family according to the ancient Greek religion.

He is the God of sky and thunder in Greek mythology. Zeus is etymologically cognate with and, under the Hellenic influence, became particularly closely identified with Roman Jupiter.

Answer: (a)

Our solar system is located in the Orion arm of the milky way galaxy, about two-thirds of the way out from the center.

The sun is about 26,000 light-years from the center of the Milky Way Galaxy, which is about 80,000 to 120,000 light-years across (and less than 7,000 light-years thick). We are located on one of its spiral arms, out towards the edge.

It takes the sun (and our solar system) roughly 200-250 million years to orbit once around the Milky Way. In this orbit, we (and the rest of the Solar System) are traveling at a velocity of about 155 miles/sec (250 km/sec).

Answer: (d)

Answer: (d)