universe & solar system section 2 MCQ Questions & Answers Detailed Explanation

Answer: (d)

On an average Sunlight reaches on Earth in 8 min. 20 sec.

Answer: (d)

The planet nearest to the sun is Mercury. Mercury is the smallest and closest to the Sun of the eight planets in the Solar System, with an orbital period of about 88 Earth days.

Answer: (c)

The planet which is called twin sister of earth is Venus. Venus is known as the Earth’s twin because of its similar size, chemical composition and density. However, due to its toxic atmosphere, Venus is not habitable.

Answer: (d)

Kapler’s law give a description of the motion of planets around the Sun.

Kepler’s are laws are

1. The orbit of every planet is an ellipse with the Sun at one of two faces.
2. A line joining a planet and the Sun sweeps out equal areas during intervals of time.

Answer: (d)

The sun is the heart spot of the Solar system which is the source of energy of all organisms on Earth. Our sun is the center of our solar system and is the source of all energy for almost every organism on the face of the Earth.

The sun provides a vast spectrum of energy. Everyone knows that the sun produces lots of heat and light. But our sun produces energy that is much more important. The vast amount of energy that our sun produces is called RADIANT ENERGY.

Radiant energy is defined as invisible and invisible light; it is also energy that travels in waves. directly or indirectly, the sun provides nearly all of the energy required by the organisms on Earth. 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.

Answer: (c)