universe & solar system section 11 MCQ Questions & Answers Detailed Explanation

Answer: (b)

1. The lithosphere is the solid, outer part of the Earth.
2. The hydrosphere is the liquid water component of the Earth.
3. An atmosphere is the mixture of gases surrounding the Earth or other celestial body.
4. The Biosphere is the part of the earth’s surface and atmosphere inhabited by living things.

Answer: (d)

An isohel is line drawn on a map connecting points that receive equal amounts of sunlight. It is derived from helios, meaning 'Sun.'

Answer: (b)

Answer: (a)

Albedo is the fraction of solar energy (shortwave radiation) reflected from the Earth back into space.

Answer: (a)

Venus is often referred to as our sister planet because of similarities in size, mass, density and volume. It is believed that both planets share a common origin forming at the same time out of a condensing nebulosity around 4.5 billion years ago.

Answer: (a)

The number of days in a year is 365 days and 6 hours (It is not a complete day). Having years of 365 days makes the year too short.

To keep up with the real length of the year maintaining an integer number of days, an extra day is added every four years.