Worksheet Solutions: Solar System

Q1: Multiple Choice Questions

(i): The family of the Sun is called
(a) celestial system
(b) organ system
(c) galaxy
(d) solar system
Ans: (d)
Explanation: The Sun and all the objects that move around it - its planets, moons, asteroids and comets - form the solar system. 

(ii): The vast space containing stars, planets, meteors etc. is called-
(a) universe
(b) galaxies
(c) solar system
(d) cosmos
Ans: (a)
Explanation: The universe means all of space and everything in it, including stars and planets. A galaxy is a large group of stars, a solar system is one star with its planets, and 'cosmos' is another word that can also mean the whole universe.

(iii): The name of our galaxy is
(a) Milky Way 
(b) Jupiter
(c) Mercury
(d) Andromeda 
Ans: (a)
Explanation: Our galaxy is called the Milky Way. Jupiter and Mercury are planets in our solar system. Andromeda is a different galaxy, not our own.

(iv): The Sun is a-
(a) Planet
(b) Galaxy
(c) Star
(d) Celestial body
Ans: (c)
Explanation: The Sun is a star because it makes its own light and heat. It is not a planet or a whole galaxy. 'Celestial body' is a general name for things in space, but 'star' is the correct and specific answer.

(v): A ___________ is a heavenly body without heat and light of its own
(a) planets
(b) sun
(c) stars
(d) moon
Ans: (a)
Explanation: Planets do not produce their own light or heat; they shine by reflecting the light of a star. The Sun and stars give their own light. The Moon also does not have its own light, but the intended general answer is 'planets'.

Q2: Answer the following questions

(i) What makes our Earth blue and green in colour?
Ans: The Earth looks blue because most of its surface is covered by water. It looks green and brown where there is land and plants.
(ii) What is atmosphere?
Ans: The atmosphere is the layer of air that surrounds the Earth.
(iii) What is a solar system?
Ans: The solar system is the family of the Sun. It includes the Sun, eight planets and their moons, and many smaller bodies.
(iv) What is a Sun?
Ans: The Sun is a huge, hot ball of gas that gives light and heat to the planets.
(v) What is a Moon?
Ans: The Moon is dry and has no air or water. It has no light of its own and shines by reflecting the Sun's light.
(vi) What is constellation?
Ans: A constellation is a group of stars that form an imaginary shape or pattern in the sky.
(vii) Write the names of planets in the solar system in order
Ans: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

Q3: True and false

(i) Earth is only planet with water and life
Ans: True
Explanation: Earth has water and many living things. So far, it is the only known planet with life.
(ii) The Earth has only water and is blue in colour
Ans: False
Explanation: The Earth has both water and land. The land and plants make parts of Earth look green and brown as well as blue.
(iii) The solar system is made up of the sun 10 planets and their moons
Ans: False
Explanation: Our solar system has eight planets, not ten.
(iv) The family of Sun is called solar system
Ans: True
Explanation: The Sun and all objects moving around it form the solar system.
(v) The Sun is a star for planet Earth
Ans: True
Explanation: The Sun is a star that gives light and heat to Earth.
(vi) There is only one type of constellation
Ans: False
Explanation: There are many constellations. Different groups of stars make different patterns in the sky.
(vii) Sunlight helps plants to produce food
Ans: True
Explanation: Plants use sunlight to make their food, which helps them grow.
(viii) Planets do not move around the Sun
Ans: False
Explanation: Planets do move; they travel in paths around the Sun.
(ix) Moon has light of its own.
Ans: False
Explanation: The Moon does not make its own light. It shines because it reflects the Sun's light.
(x) The full Moon is also called Purnima.
Ans: True
Explanation: In many Indian languages, the full Moon day is called Purnima.

Q4: Define the terms

(i) Heavenly body
Ans: A heavenly body is any natural object in space, for example the Sun, the Moon, the stars and the planets.
(ii) Solar System
Ans: The Solar System includes the Sun, the eight planets and the other heavenly bodies that move around the Sun.
(iii) Stars
Ans: Stars are large heavenly bodies that give out their own heat and light.
(iv) Constellation
Ans: A constellation is a group of stars that form a particular pattern in the sky.
(v) Planets
Ans: Planets are heavenly bodies that move around the Sun.

Q5: Solve the puzzle

Ans: