DAV Class 6 SST Chapter 1 Question Answer | Complete Solution

 

DAV Class 6 Chapter 1 Question Answer The Planet earth and the Solar System

If you are searching for DAV Class 6 Chapter 1 Solution then you are at right place . We are providing the complete solution of first chapter of DAV Class 6 SST Book. The Planet Earth and the solar system is the first chapter of We and our World a book prescribed by DAV school for class 6. The book is divided into three part . Geography is the first part of the book and and this chapter is the first chapter of geography. Authentic solution from subject expert will help you in your study.

 

Something To Know

 A.  Tick (✓) the correct option.

 

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

         (a) Asteroids  (b) meteors  (C) Galaxy  (d) universe

          Answer – Galaxy

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

          (a) Mercury  (b) Venus   (C)Mars     (d) Jupiter

Answer – Venus

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

        (a)  Uranus         (b) Neptune     (C) Saturn          (d) Jupiter

                Answer - Neptune

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

                (a) Venus   (b) Mars   (C) Neptune   (d) Earth

      Answer - Venus 

 5.  Which planet has two satellites?

         (a) Mercury   (b) Venus    (C) Earth   (d) Mars

Answer – 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 Orbit.

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

C.    Match the following :

Answer -

1. Great Bear                                                      d. Constellation

 

2.    Head of solar system                                   c. Sun

 

3.    A giant cloud of gases and dust                    a. Nebula

 

4.    Shape of the earth                                           e. Spherical

 

5.    Red Planet                                                         b. Mars

 

D.   Answer the Following Question in brief.

1. What are the celestial bodies?

Answer -  All the objects in the sky, the Sun, the stars, the moon, the planets and other objects are called celestial bodies.

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

Answer – Stars are very far away from us so they look very small in the sky.

3.    What is ‘Saptrishi Mandal’ ?

Answer -  The constellation of seven stars is called Saptrishi Mandal in India.

4.    Name the Planets which are gaseous bodies?

Answer – Two planets, Jupiter and Saturn are gaseous bodies.

5.    Which Planet is the closest to Neptune?

Answer – Uranus is closest to Neptune.

E.   Answer the following Questions

1. Describe the formation of solar system.

Answer -  some scientists had the opinion that our solar system was born from the giant cloud of gas and dust known as nebula. it cooled and gained very fast rotation. Eight gas balls of various sizes were separated from it and formed the eight planets. Remaining nebula  had formed the Sun. The satellites were also created when tiny gas spheres broke off from their parent mass and attracted by their companion planet.

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

Answer - The three features that make the earth a unique planet is as follows:

1. Water covers two-thirds of the earth's surface, which is the primary factor in the origin of life.

2. Earth's  temperature, which is neither too hot nor too cold, is ideal for the evolution of life.

3. The earth is surrounded by the airy envelope which contains dust, water vapours and gases necessary for life on the planet.

3. Mention three main characteristics of a satellite.

Answer - Three characteristics of a satellite is as follows:

1. All satellite revolves around their respective planet.

2. Satellites take their heat and light from the Sun because they do not have their own light

3. All satellites are celestial or heavenly bodies. 

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

Answer - The different shapes of the Moon appears from the Earth over the course of about a month are known as its phases.

The visible portion of the moon goes on increasing after new moon (Amavasya). At first it appears as a crescent, gradually changing to a half-moon on the eighth day, and finally becoming a full moon known as full moon day (Purnima) on the fifteenth day. After this day decline of the moon's illuminated part starts and finally it disappears and again comes to the position of New moon (Amavasya)

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

Answer- 

Asteroids- Asteroids are rocky space object  that orbit our Sun. These can range in size from a few feet to hundreds of  kilometers. Space between the orbit of  Mars and Jupiter is known as Asteroid Belt.

Meteoroid: In space, meteoroids are small pieces of rock and debris. They become meteors or shooting stars when they enter the Earth's atmosphere at high speed, leaving a bright trail as they are heated  due to friction of atmosphere. 

Comets - Comets are small bodies composed of frozen gases and dust particles. It has a long bright tail and a head. They appear in the sky after a long period. Hailey's comet appears after every 76 year interval in the sky.