RBSE Class 6 Social Science Important Questions Geography Chapter 1 The Earth in the Solar System

Rajasthan Board RBSE Class 6 Social Science Important Questions Geography  Chapter 1 The Earth in the Solar System Important Questions and Answers. 

RBSE Class Social Science Important Questions Geography Chapter 1 The Earth in the Solar System

Multiple Choice Questions

Question 1. 
Full Moon night occurs once in every :
(a) day 
(b) 15 days
(c) 20 days 
(d) month.
Answer:
(b) 15 days

 

Question 2. 
The New Moon night is called:
(a) Amavasya 
(b) Krishna Paksha
(c) Summer Solstice
(d) Poornima.
Answer:
(a) Amavasya 

Question 3. 
The Sun is 
(a) a star 
(b) a celestial body
(c) the head of the Solar System
(d) All of these.
Answer:
(d) All of these.

Question 4. 
Which one of the following terms is used for the Full Moon night?
(a) Amavasya 
(b) Poornima
(c) Equinox 
(d) Winter solistice.
Answer:
(b) Poornima

Question 5. 
Ursa Mqjor/Big bear is a     
(a) Star 
(b) Galaxy
(c) Constellation 
(d) Asteroid.
Answer: 
(c) Constellation 

Fill in the blanks

Question 1. 
The Amavasya night occurs about ............... the day after the Poornima night.
Answer:
fifteenth

Question 2.
Stars are celestial bodies that are ............... and ...............   
Answer:
big and hot

Question 3. 
Eight planets move around the sun in a fixed path, which is called ...............  
Answer:
orbit

Question 4. 
The Greek word which is the origin of the word ‘Planet’ means ...............  
Answer:
wanderer,

Question 5. 
Three planets having rings around them are ............... and ...............  
Answer: 
Jupiter, Saturn, Uranus.

True/False

Question 1. 
When we look at the earth from a distance, it will look like a moon.
Answer:

Question 2. 
Mercury takes only about 255 days to complete one round along the sun.
Answer:

Question 3. 
The sum is about 3,84,400 km away from the earth.
Answer:

Question 4. 
Our galaxy is a part of the solar system.
Answer:

Question 5. 
Saturn has rings around them.
Answer: 
True.

Match the column

A	B
1. The Moon	(a) Outer planets
2. The Earth	(b) Asteroid Belt
3. The planet with	(c) Neptune the longest year
4. Mars and Jupiter	(d) Venus
5. Saturn and the longest day	(e) 75% water Uranus
6. The planet with the longest day	(f) 3.84 million kms the longest day away from the Earth

Answer: 

A	B
1. The Moon	(f) 3.84 million kms the longest day away from the Earth
2. The Earth	(e) 75% water Uranus
3. The planet with	(c) Neptune the longest year
4. Mars and Jupiter	(b) Asteroid Belt
5. Saturn and the longest day	(a) Outer planets
6. The planet with the longest day	(d) Venus

Very Short Answer Type Questions

Question 1. 
In which galaxy our solar system is located?
Answer: 
The galaxy in which our solar system is located is called the Milky Way or Akash Ganga.

Question 2. 
What are meteoroids?
Answer: 
The small pieces of rocks which revolve around the Sun are called meteoroids. 

Question 3. 
What is a Light year?
Answer: 
The distance covered by light in one year is called a light-year.

Question 4. 
How much time does the sunlight take to reach the Earth’s surface?
Answer: 
The sunlight takes about 8 minutes to reach the Earth’s surface.

Question 5. 
Who is an astronomer?
Answer: 
An astronomer is a scientist in the field of astronomy who study about celestial bodies and their movements.

Question 6. 
Why do the planets revolve around the Sun in a fixed path?
Answer: 
The gravitational pull of the Sun keeps the planets revolving in a fixed path.

Question 7. 
Name the planets that have rings around them.
Answer: 
The planets having rings around them are Jupiter, Saturn and Uranus.

Question 8. 
Name two celestial bodies visible only in the night sky.
Answer: 
The moon and the stars are celestial bodies visible in the night sky.

Question 9. 
Which is the most easily recognizable constellation?
Answer: 
The most easily recognizable constellation is the Great Bear or Saptarishi (Saptaseven, Rishi-sages).

Question 10. 
What does the solar family consist of?
Answer: 
The solar family consists of the Sun, planets, satellites, asteroids and meteoroids.

Question 11. 
How much time does the moon takes to complete one rotation and one revolution around the Earth?
Answer: 
The moon revolves around the Earth in about 27 days. It takes exactly the same time to complete one rotation on its axis in 27 days that is why we could see only one side of moon.

Question 12. 
Name all the planets according to their size (biggest to smallest).
Answer: 
Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury.

Question 13. 
Why do we not feel the heat and light of the stars, even though they are so big and hot?
Answer: 
We do not feel the heat and light of the stars they are too far away from us.

Question 14. 
Why life is not possible on the Moon?
Answer: 
The moon does not have favourable conditions for life. It has neither water nor air. In the day time it is very hot, while at night it becomes very cold.

Question 15. 
Why is the earth called “Blue Planet”?
Answer: 
From outer space, the earth appears blue because its two-thirds surface is covered by water. Therefore, the earth is called Blue planet.

Question 16. 
Name the Earth’s twin planet. Why is called so? 
Answer: 
Venus is called the earth's twin because it is similar to Earth in its shape and size.

Short Answer Type Questions

Question 1. 
How did the ancient people find out the directions in the night?
Answer: In ancient times, people used to determine the directions during the night with the help of the north star. It indicates the north direction and always remains in the same position in the sky. It is also called the Pole star.

Question 2. 
When and why Pluto was declared as a Dwarf Planet?
Answer: 
Pluto was declared a dwarf planet in the year 2006 by the International Astronomical Union (IAU). This was decided because of its size and the strength of its gravitational field. So, Pluto and objects like it are now called Dwarf planets.

Question 3. 
Stars twinkle but planets do not; Why?
Answer: 
Planets do not have their own heat and light and are closer to Earth in comparison to stars. Whereas stars Have their own heat and light which travels a long path to reach the Earth. This light bends due to earth’s atmospheric interference and seems to twinkle. Hence, stars twinkle and planets do not.

Question 4. 
Why is the Sun, called a lifeline for all the members of the solar system?
Answer: 
The sun is the heart of our solar system. It is called as the lifeline because

1. Its gravity holds all the planets in their orbits. 
2. It provides heat, light and energy to T the planets.
3. Planets make their food with the help of sunlight.
4. Changing seasons, weather conditions, climate and ocean currents are caused due to interaction between Earth and Sun.

Question 5. 
Why does the Moon appear different each night?
Answer: 
The moon does not have its own light. The light we see is the sunlight bouncing off the moon’s surface. As the Moon orbits earth, the Sun lights up whatever side of Moon facing it, but we see the moon from the center of its orbit. So we see different portions of the lit side of the Moon.

Question 6. 
Make a table showing the unique feature of each planet.

Planet	Unique Feature
1. Mercury	Nearest to Sun
2. Venus	Earth’s twin
3. Earth	Unique planet/Blue planet
4. Mars	Red planet
5. Jupiter	Largest planet
6. Saturn	Planet with rings
7. Uranus	Rotates from east to west
8. Neptune	Contains dark spots

Question 7. 
What is the difference between a natural satellite and a human-made satellite? 
Answer:

Natural satellite	Human-made satellite
A satellite is a celestial body that moves around the planets in the same way as the planets move around the sun.	A human-made satellite is an artificial body. It is designed by scientist to gather information about the universe or for communication. It is carried by a rocket and placed in the orbit around the earth.
Example: The moon is the natural satellite of the earth.	Example: Indian satellites in space are INSAT, IRS, EDUSATetc.

Question 8. 
Mercury takes less time to complete one revolution than Neptune. Explain.
Answer: 
Mercury takes 88 days to complete one revolution because it is nearest to the Sun. Neptune takes 165 years to complete one revolution because it is farthest from the Sun. The things which are far away from the center have to cover a longer distance and things which are closer, have to cover less distance.

Question 9. 
Distinguish between a planet and a satellite.
Answer: 
The difference between a planet and a satellite is:

(i) Planet is a natural celestial body.	revolves aro- nd the planet.
(ii) Planet revolves around sun.	There are 57 satellites in our solar system.
(iii) There are eight planets in our solar system. For e.g., Earth, Jupitar, Mars, Venus, etc.	For eg, Moon (natural satellite), INSAT, EDUSAT, IRS, etc. (Human-made satellite)

Long Answer Type Questions

Question 1. 
How can the position of the Pole star be known? Make a picture of the Saptarishi and the Pole Star.
Answer: 
Pole Star and its positionPole star is also known as the North Star. It indicates the north direction. It always remains in the same position in the sky. We can locate the position of the Pole Star with the help of the Saptarishi. According to the figure if an imaginary line is drawn joining the pointer stars and extended further, it will point to the Pole Star.

Question 2. 
Draw the solar system and describe the inner and outer planets-in terms of their rotation, spin on-axis and the number of moons.
Answer: 

(1) Inner PlanetsThey are very close to the sun. They are made up of rocks. This includes Mercury, Venus, Earth, and Mars.

1. MercuryOne orbit around the sun-88 days. One spin an axis-59 day, number of moons-0.
2. VenusOne orbit around the sun-225 days. One spin an axis-243 day, number of moons-0.
3. EarthOne orbits around the sun-365 days. One spin on axis-1 day, number of moons-1.
4. MarsOne orbit around the sun-687 days. One spin on axis-1 day, number of moons-1.

(2) Outer PlanetsThey are very-very far from the sun and are huge planets made up of gases and liquids. This includes Jupiter, Saturn, Uranus, and Neptune.

1. JupiterOne orbit around the sun-11 years, 11 months about 12 years. One spin an axis-9 hour, 56 minutes, number of moons-about 53.
2. SaturnOne orbit around the sun-29 years, 5 months. One spin on the axis-10 hours 40 minutes, number of moons-about 53.
3. UranusOne orbit around the sun-84 years. One spin around the axis-17 hours 14 minutes, a number of moons-about 27.
4. NeptuneOne orbit around the sun- 164 years. One spin axis-16 hours 7 minutes, number of moons-13.

Question 3. 
Describe the main facts related to the moon.
Answer:
Moon-

1. Moon is the satellite of the earth.
2. Moon’s diameter is only one-quarter that of the earth. It appears so big because it is nearer to our planet than other celestial bodies. 
3. It is about 3,84,400 km away from us. 
4. The moon moves around the earth in about 27 days.
5. We see the moon in different shapes and different positions at different times every day.
6. One can see full moon about once a month. It is a full moon night or full moon.
7. We cannot see it after fifteen days. It is the new moon night.
8. The moon does not have conditions favourable for life.
9. It has mountains, plains and depressions on its surface. These cast shadows on the moon’s surface. At the full moon day, we can observe these shadows on moon.

Question 4. 
What do you understand by asteroids and meteoroids? Tell us about them.
Answer: 
Asteroids Apart from the stars, planets and satellites, there are numerous tiny bodies that also move around the sun. These bodies are called asteroids. They are found between the orbits of Mars and Jupiter. Scientists are of the view that asteroids are parts of a planet that exploded many years back. Meteoroids The small pieces of rocks which move around the sun are called meteoroids. Sometimes these meteroids come near the earth and tend to drop upon it. During this process due to friction with the air they get heated up and burn. It causes a flash of light. Sometimes, a meteor without being completely burnt, falls on the earth and creates a hollow.

Question 5. 
Explain by experiment, why do we not see things that shine in the sky at night?
Answer: 
Experiment materialWe will take a torch, a plain paper, pencil and a needle and use it in the following steps

1. Place the flashlight in the middle of the paper in such a way that its glass remains adjacent to this paper.
2. Now, draw a circle around the glass of the flashlight.
3. Then small holes will be made with a needle in the area of the circle on the paper.
4. Now, put the perforated circular portion of the paper on the glass in front and wrap the paper around the flashlight and apply a rubber band.
5. In the dark room, we will put the light of this flashlight on the wall facing a plain wall. Several small points of light will appear on the wall. Just like the stars shine in the sky at night.
6. Now, after lighting all the lights of the room, we will see that all the points of light became almost invisible. .
7. This happened due to the intense light.