Class 8 Science Chapter 17 MCQ

Morning star is the name given to the planet Venus because sometimes, it appears in the eastern sky before sunrise.

The sun appears to move from East to West around the earth, it means that the earth rotates in opposites direction, i.e., from West to East.

Here, all the statements are correct. Hence, your answer will be option [D].

The ball will go up and then comes down because at moon, acceleration due to gravity is less than that of the earth.

As we know that, the time period is directly proportional to the distance from the sun, so the new planet discovered between Uranus and Neptune will have less time period than the Neptune and greater than the Uranus.

The earth revolves around the Sun in orbital plane.

Here, all the statements are correct. Hence, your answer will be option [D].

The brightest star in the night sky is Sirius which is located close to the Orion Constellation. Except Sirius, all planets are members of solar system.

Here, all the statements are correct. Hence, your answer will be option [D].

The group of stars which appears to form some recognizable shape or pattern is known as constellation. Some of the important are: Ursa major, Orion, Cassiopeia, Leo major. Constellations are not the part of the solar family.

The moon is a natural satellite of the earth. Moon is not a planet. Hence, your answer will be option [D].

Here, all the statements are correct. Hence, your answer will be option [D].

Here, all the statements are correct. Hence, your answer will be option [D].

The distances between the various celestial objects are usually expressed in the unit of “Light years”. 1 light year = 9,460,800,000,000 kilometers.

Here, all the statements are correct. Hence, your answer will be option [D].

Orion Constellation is visible in the sky during the winter season in the late evenings and Cassiopeia constellation is visible during winter in the early part of the night.

Here, all the statements are correct. Hence, your answer will be option [D].

There is a wide gap in between the orbit of planet Mars and Jupiter. A large number of small objects made of rocks revolves around the sun in the wide space between the orbits of the planets Mars and Jupiter in the solar system. These are called asteroids.

The biggest planet of the solar system is “Jupiter” whereas the smallest planet of the solar system is “Mercury”.

Saturn is only planet with the system of well-developed rings encircling it. The rings of Saturn are made up of tiny particles, all orbiting the Saturn like miniature satellites. The rings of Saturn cannot be seen with naked eyes, they can be observed only with the help of a telescope and also Saturn has the maximum number of satellites of all the planets in the solar system.

The biggest planet of the solar system is “Jupiter” whereas the smallest planet of the solar system is “Mercury”.

Objects which do not emit light on their own are called non−luminous objects. Objects that give out or emit light of their own are called as luminous objects. Sun is a source of light and thus, gives out or emits light of its own and hence, is a luminous object. Planet Mercury can be seen as a “morning star” or an “evening star”. Moon, planets and Earth are non-luminous objects because they do not emit light of their own and glow by reflecting the light of the sun.

Mercury and Venus show phases like the Moon. They have the orbits which are smaller than the Earth and exhibit the full range of phases like the moon. When certain portion of a planet surface reflects direct sun, it is viewed from a vantage point. This is called as planetary phase. Mercury and Venus are within the orbit of the earth. So, these planets are called as inferior planets. Sometimes, entire planet is viewed from the earth, as they are at superior conjunction. This phase is called “full”. These planets cannot be viewed properly from earth surface because sun light is scattered on the earth’s atmosphere. But these planets are easily viewed in space from their vantage point. When the planets are in inferior conjunction, they pass between sun and earth. This phase is called “new”.

The Agency responsible for the development of “space science programmes” in our country is “Indian Space Research Organization” (ISRO). India has built and launched many artificial satellites. The first artificial satellite launched by India was “Aryabhatta”.

Here, all the statements are correct. Hence, your answer will be option [D].