Question 1 Answer the following questions briefly.
(a) How does a planet differ from a star?
(b) What is meant by the ‘Solar System’?
(c) Name all the planets according to their distance from the sun.
(d) Why is the Earth called a unique planet?
(e) Why do we see only one side of the moon always?
(f) What is the Universe ?
|Celestial bodies which have their own heat and light are called stars.||Celestial bodies which do not have their own heat and light are called planets.|
|For example : Sun||For Example : Mercury, Venus, Earth etc.|
|There are millions of stars in our solar system.||There are 8 planets in our solar system.|
(b) The Sun, Eight planets, satellites and other celestial bodies such as steroids, meteoroids forms the solar system.
(c) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
(d) The Earth is called a unique planet because
(1) It has a temperature range that supports life. It is neither too hot nor too cold.
(2) It is the only planet known to support life. It has oxygen and water present in proportions that allow life to survive.
(e) One revolution of the moon around the earth takes about 27 days. Incidentally, the moon’s rotation about its own axis also takes nearly the same time. One day of the moon is equal to 27 Earth days. So only one side of the moon can be seen from the earth.
(f) Universe is a collection of million of galaxies.
Question 2 Tick the correct answer.
(a) The planet known as the “Earth’s Twin” is
(i) Jupiter (ii) Saturn (iii) Venus
(b) Which is the third nearest planet to the sun ?
(i) Venus (ii) Earth (iii) Mercury
(c) All the planets move around the sun in a
(i) Circular path (ii) Rectangular path (iii) Elongated path
(d) The Pole Star indicates the direction to the
(i) South (ii) North (iii) East
(e) Asteroids are found between the orbits of
(i) Saturn and Jupiter (ii) Mars and Jupiter (iii) The Earth and Mars
(a) (iii) Venus
(b) (ii) Earth
(c) (iii) Elongated path
(d) (ii) North
(e) (ii) Mars and Jupiter
Question 3 Fill in the blanks.
(a) A group of ________ forming various patterns is called a ________.
(b) A huge system of stars is called________.
(c) ________is the closest celestial body to our earth.
(d) ________is the third nearest planet to the sun.
(e) Planets do not have their own________ and _________.
(a) A group of star forming various patterns is called a constellation.
(b) A huge system of stars is called galaxy.
(c) Moon is the closest celestial body to our earth.
(d) Earth is the third nearest planet to the sun.
(e) Planets do not have their own heat and light.