universe & solar system section 5 MCQ Questions & Answers Detailed Explanation

Answer: (c)

Jupiter takes maximum time for one revolution around the sun.

Jupiter revolves or orbits around the Sun once every 11.86 Earth years, or once every 4,330.6 Earth days.

Jupiter travels at an average speed of 29,236 miles.

Answer: (a)

Answer: (c)

The sidereal day is the time it takes for the Earth to complete one rotation about its axis with respect to the ‘fixed’ stars.

By fixed, we mean that we treat the stars as if they were attached to an imaginary celestial sphere at a very large distance from the Earth. A measurement of the sidereal day is made by noting the time at which a particular star passes the celestial meridian (i.e. directly overhead) on two successive nights.

On Earth, a sidereal day lasts for 23 hours 56 minutes 4.091 seconds, which is slightly shorter than the solar day measured from noon to noon. At the same time that the Earth spins on its axis, it also orbits or revolves around the Sun. This movement is called revolution.

Answer: (a)

The galaxy has within it many clouds of gas and dust – often associated with a nebula created from a supernova explosion.

These clouds are mostly made of the elements hydrogen and helium, as these are the most common elements in the universe.

Answer: (a)

The Earth is closest to the Sun or at its Perihelion- about two weeks after the December solstice, i.e. 3 January and farthest from the Sun or at its Aphelion, about two weeks after the June solstice, i.e., 4 July.

Answer: (a)

The largest planet in our solar system is Jupiter. Jupiter is the fifth planet from the Sun and the largest planet in the Solar System.

It is a gas giant with mass one-thousandth of that of the Sun but is two and a half times the mass of all the other planets in the Solar System combined.