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

Answer: (b)

An eclipse occurs when a star (such as Sun) aligns with two celestial bodies, such as a planet and a moon. The closer body casts a shadow that intersects the more distant body. This means that “things get dark.”

The region of the shadow is divided into an umbra, where the light from the star is completely blocked, and a penumbra, where only a portion of the light is blocked.

Beyond the end of the umbra is a region called the antumbra. For an observer inside the antumbra of a solar eclipse, for example, the moon appears smaller than the sun, resulting in an annular eclipse.

Answer: (a)

Answer: (a)

Answer: (a)

Venus orbits the Sun at an average distance of about 0.72 AU (108,000,000 km) and completes an orbit every 224.65 days.

Although all planetary orbits are elliptical, Venus's orbit is the closest to circular, with an eccentricity of less than 0.01.

Answer: (d)

Answer: (c)

The Steady State theory (also known as the Infinite Universe theory or continuous creation) was developed in 1948 by Fred Hoyle, Thomas Gold, Hermann Bondi, and others as an alternative to the Big Bang theory.

In the steady-state theory, the density of matter in the expanding universe remains unchanged due to a continuous creation of matter. It asserts that the observable universe is basically the same at any time as well as at any place.