universe & solar system section 4 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Answer: (d)

Albedo also varies according to the angle of incidence of the Sun Raysbeing higher for slating rays and lower for vertical or nearly vertical rays.

From this, we can derive that albedo will be relatively higher during the early morning and late evening because, at both times, Sun rays are slanting.

Answer: (d)

Sial refers to the upper layer of the earth’s crust. It is rich in silicon and aluminum.

Answer: (a)

A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth’s surface.

Answer: (b)

Answer: (c)

The Earth completes one “rotation” every twenty four hours. A rotation is when the planet spins around once. The Earth rotates counter-clockwise; this is why the Sun “rises” in the east and “sets” in the west. Revolution is when one object completes a circular path around another object.

The Earth takes 365.24 days to revolve around the Sun. This is why a year is 365 days long. During the year the Earth is angled differently towards the Sun.

These changing angles provide us with different Sun intensities and therefore we get four different seasons.