universe & solar system section 10 MCQ Questions & Answers Detailed Explanation

Answer: (d)

The different phases of the moon are caused by changing the angle of the earth with respect to moon. The moon’s phases are a result of the moon’s orbit around the earth as it reflects the sun’s light.

The lunar phases vary cyclically as the Moon orbits the Earth, according to the changing relative positions of the Earth, Moon, and Sun.

Answer: (d)

Answer: (a)

A galaxy is a huge system of billions of stars and clouds of dust and gases.

Answer: (c)

Answer: (c)

In physics, radiation is a process in which energetic particles or energetic waves travel through a vacuum, or through matter-containing media that are not required for their propagation. The Earth receives 174 petawatts (PW) of incoming solar radiation (insolation) at the upper atmosphere.

Answer: (c)

According to the Nova hypothesis, Solar planets were formed because of the explosion of Super Nova. A star becomes Super Nova in that stage when it has lacks hydrogen elements. A supernova happens where there is a change in the core, or center, of a star.

A change can occur in two different ways, with both resulting in a supernova. The first type of supernova happens in binary star systems. Binary stars are two stars that orbit the same point. One of the stars, a carbon-oxygen white dwarf, steals matter from its companion star. Eventually, the white dwarf accumulates too much matter. Having too much matter causes the star to explode, resulting in a supernova. The second type of supernova occurs at the end of a single star’s lifetime. As the star runs out of nuclear fuel, some of its mass flows into its core.

Eventually, the core is so heavy that it cannot withstand its own gravitational force. The core collapses, which results in the giant explosion of a supernova. The sun is a single star, but it does not have enough mass to become a supernova.