Chapter 1 | The Planet Earth and the Solar System | Class- 6 DAV Social Science Solutions

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Class- 8 DAV Social Science The Planet Earth and the Solar System Question and Answer

A. Tick the correct Option:

1. What do we call a huge cluster of billions of stars?

Ans: Galaxy

2. Which one of the following is the hottest planet?

Ans: Venus

3. Which is the most distant planet from the Sun?

Ans: Neptune

4. The planet which does not have any satellite is-

Ans: Venus

5. Which planet has two satellites?

Ans: Mars

B.Fill in the blanks

1. The vast limitless space which includes all celestial bodies is called Universe.

2. The distance between celestial bodies is measured in a unit called Light Year.

3. Pole Star always indicates the north direction.

4. All the planets of our solar system revolve round the Sun in their fixed paths called Orbits .

5. Earth is the third nearest planet to the Sun.

C.Match the following :

Ans:

D. Answer the following questions in brief.

1. What are celestial bodies?

Ans: Celestial bodies or heavenly bodies are objects in space such as the sun, moon, planets, and stars. 

2. Why do stars look very small in the sky?

Ans: The stars look very small in the sky because there they are very far away from Earth or they are billion of kilometres away from the Earth.

3. What is ‘Saptarishi Mandal’?

Ans: In India the seven stars a part of great bear is called Saptarishi Mandal.

4. Name the planets which are gaseous bodies.

Ans: Jupiter and Saturn have gaseous bodies.

5. Which planet is the closest to Neptune?

Ans: Uranus is closest to Neptune.

Bonus : Short Trick to Remember My Very Easy Method Just Speeds Up Names (MVEMJSUN)

E. Answer the following questions.

1. Describe the formation of the solar system.

Ans: The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula. The Sun formed in the center, and the planets formed in a thin disk orbiting around it. In a similar manner, moons formed orbiting the gas giant planets. Comets condensed in the outer solar system, and many of them were thrown out to great distances by close gravitational encounters with the giant planets. After the Sun ignited, a strong solar wind cleared the system of gas and dust. The asteroids represent the rocky debris that remained.

2. State three features that make the earth a unique planet.

Ans: Three features that make the earth a unique planet are:

1. The earth recieves moderate heat and light from the sun.This much quantity of heat and light helps to evolve and sustains life of earth.
2. About 2/3rd of earth is covered with water.Water is essential for human beings ,animals and plants.
3. Earth has an envelope of air around it. It contains gases,water vapours which helps in supporting life.

3. Mention three main characteristics of a satellite.

Ans: Three main characteristics of a satellite are:

• They revolve around their respective planets.
• They don’t have their own heat and light.They reflect the light they receive from sun.
• It switches its phases systematically.

4. Give a brief description of the Phases of the Moon with the help of a diagram.

Ans: The moon gets illuminated by the sun, which is visible to us. The position of the moon in relation to the sun changes every day. When the illuminated side of the moon is fully hidden from our view, it is called the New Moon (Amavasya). The day when the moon is completely visible to us is the Full Moon Day (Purnima). The figure below shows how the moon changes its shape every 15 days.

5. Write a short note on the other celestial bodies (asteroids, meteoroids, and comets) in the solar system.

Ans:

Asteroids- Asteroids are small solid objects revolving around the Sun in orbits. They are also known as planetoids or minor planets. Millions of asteroids have been found between the orbits of Mars and Jupiter.

Meteoroid- Meteoroids are small rock pieces that revolve around the Sun. Some meteoroids enter the Earth’s atmosphere with a great velocity.  Example: Leonid

Comets- Comets are heavenly bodies that revolve around the Sun in an elongated orbit. They are usually made up of dust, ice particles, and gases. Example: Halley