Class 6 Geography Chapter 1 Practice Question Answers - The Earth in the Solar System

Q1: How many days does Mercury takes to complete one round along its orbit?
Ans: 88 days.

Q2: Name the life supporting gas in the air on the earth.
Ans: Oxygen.

Q3: When the meteor falls on the earth, they create ______.
Ans: Craters.

Q4: Name the materials by which the rings around Jupiter, Saturn and Uranus are made up of?
Ans: Small debris made up of rocks, metals and ice.

Q5: Uranus has about ______ moons.
Ans: 27 moons.

Q6: Why is the Milky Way galaxy named as Akash Ganga?
Ans: Milky Way galaxy is often Known as Akash Ganga because at the clear night the entire galaxy looks like a white and wide river especially like river Ganga.

Q7: How many days does the moon takes to complete one spin?
Ans: 27 days.

Q8: Name a constellation.
Ans: Saptarishi.

Q9: What is another name for the Pole Star?
Ans: North Star.

Q10: Name the celestial bodies that are made up of gases and emit their own heat and light.
Ans: Stars.

Q11: What do you mean by Stars and planets? Given one example of each.
Ans:

• Stars: Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars. Example: The sun is a star.
• Planets: Some celestial bodies do not have their own heat and light. They are lit by the light of the stars. These celestial bodies are called planets. Example: The earth is a planet.

Q12: How are planets different from stars?
Ans: Stars are different from planets in the following ways:

• Stars have their own light while planets are lit by the light of the stars.
• Stars twinkle but planets do not.
• Stars are made up of hot, burning gases while planets are made up of solid materials.
• There are millions of stars whereas the number of planets is only eight.

Q13: What is a galaxy?
Ans: A galaxy is a huge system of stars. The white glowing path of stars across the sky is called the Milky Way galaxy. We in India call it Akash Ganga. It has millions of stars very close to one another. All planets revolve round the Sun and our Solar System.

Q14: Write a short note on human-made satellites. Name some Indian Satellites.
Ans: Human-made satellites are artificial bodies. They are designed by scientists together information

about the universe or for communication. They are carried by rockets and placed in the orbit around the earth. Some Indian satellites in space are: INSAT, IRS, EDUSAT, etc.

Q15: Why is the Earth called a unique planet?
Ans: The Earth is the only planet which has conditions favourable to support life. It is neither too hot nor too cold. Its two-thirds surface is covered with water and its atmosphere contains high amount of oxygen which is essential to our life. The solid crust of the Earth consists of soil and minerals which are quite favourable for life to exist. These conditions make our Earth a unique planet in the solar system.

Q16: How does the Moon appear different each night?
Ans: The Moon revolves round the Earth. Its position in relation to the Sun changes every day as it has no light of its own, it only reflects the light of the Sun. The Moon neither decreases nor increases in reality, it only appears changed its shape because of difference in light falling on it everyday.

Q17: 'The Sun is the head of the Solar System'. Explain.
Ans: The sun keeps an important place in the solar system because of:

• It is the ultimate source of heat and light for the solar family.
• The planets, their satellites and other celestial bodies remain within the solar system due to the sun’s gravitational power.
• The sun is at the centre of a huge rotating system.

Q18: Name the inner and outer planets. What are they made up of?
Ans:

• Name of the outer planets: Jupiter, Saturn, Uranus and Neptune. They are far from the sun and are made up of gases and liquids.
• Name of the inner planets: Mercury, Venus, Earth and Mars. They are very close to the sun and are made up of rocks.

Q19: Write a short note on Moon.
Ans:

• The moon is the only satellite of the earth.
• Its diameter is only one-quarter that of the earth.
• It appears so big because it is nearer to our planet than other celestial bodies. It is about 3,84,400 km away from the Earth.
• The moon does not have conditions favourable for life. It has neither water nor air.
• The moon reflects the light of the sun and its phase differs each night.
• The moon moves around the earth in about 27 days. It takes exactly the same time to complete one spin. As a result, only one side of the moon is visible to us on the earth.

Q20: Name the largest and the smallest planets. Which planets are bigger and which are smaller than the Earth?
Ans: The largest and the smallest Planets. Jupiter is the largest and Mercury is the smallest of all the planets.

• Planets bigger than the Earth: (i) Neptune (ii) Uranus (iii) Saturn and (!u) Jupiter are bigger planets than the Earth.
• Planets Smaller than the Earth: (i) Venus, (ii) Mars and (Hi) Mercury are smaller planets than the Earth.