Textbook Solutions: The Universe | General Science Class 6 (Maharashtra Board) PDF Download

 Page 1


Chapter 16: The Universe 
 
 
EXERCISE [PAGE 118] 
Exercise | Q 1.1 | Page 118 
Name the birth place of stars. 
 
SOLUTION 
Birth place of stars: Nebula 
Exercise | Q 1.2 | Page 118 
Name the biggest planet in the solar system 
 
SOLUTION 
Biggest planet in the solar system: Jupiter 
Exercise | Q 1.3 | Page 118 
Name the galaxy which is our neighbour. 
 
SOLUTION 
The galaxy which is our neighbour: Andromeda 
Exercise | Q 1.4 | Page 118 
Name the brightest planet in the solar system. 
 
SOLUTION 
Brightest planet in the solar system: Venus 
Exercise | Q 1.5 | Page 118 
Name the planet with largest number of satellites. 
 
SOLUTION 
Planet with largest number of satellites: Jupiter 
Exercise | Q 1.6 | Page 118 
Name the planets without a single satellite. 
 
SOLUTION 
Planets without a single satellite: Mercury and Venus 
Exercise | Q 1.7 | Page 118 
Name the planet with a rotation different from other planets. 
SOLUTION 
Planet with a rotation different from other planets: Venus and Uranus. 
Page 2


Chapter 16: The Universe 
 
 
EXERCISE [PAGE 118] 
Exercise | Q 1.1 | Page 118 
Name the birth place of stars. 
 
SOLUTION 
Birth place of stars: Nebula 
Exercise | Q 1.2 | Page 118 
Name the biggest planet in the solar system 
 
SOLUTION 
Biggest planet in the solar system: Jupiter 
Exercise | Q 1.3 | Page 118 
Name the galaxy which is our neighbour. 
 
SOLUTION 
The galaxy which is our neighbour: Andromeda 
Exercise | Q 1.4 | Page 118 
Name the brightest planet in the solar system. 
 
SOLUTION 
Brightest planet in the solar system: Venus 
Exercise | Q 1.5 | Page 118 
Name the planet with largest number of satellites. 
 
SOLUTION 
Planet with largest number of satellites: Jupiter 
Exercise | Q 1.6 | Page 118 
Name the planets without a single satellite. 
 
SOLUTION 
Planets without a single satellite: Mercury and Venus 
Exercise | Q 1.7 | Page 118 
Name the planet with a rotation different from other planets. 
SOLUTION 
Planet with a rotation different from other planets: Venus and Uranus. 
Exercise | Q 1.8 | Page 118 
Name the celestial body that carries a tail along. 
 
SOLUTION 
A celestial body that carries a tail along: Comets 
Exercise | Q 2.1 | Page 118 
Fill in the blank. 
The group of galaxies of which our Milky Way is a part is called ________. 
 
SOLUTION 
The group of galaxies of which our Milky Way is a part is called 'Local Group'. 
Exercise | Q 2.2 | Page 118 
Fill in the blank. 
Comets are made of _______. 
 
SOLUTION 
Comets are made of ice and dust particles. 
Exercise | Q 2.3 | Page 118 
Fill in the blank. 
The planet _______ appears as if it is rolling along its orbit. 
 
SOLUTION 
The planet Uranus appears as if it is rolling along its orbit. 
Exercise | Q 2.4 | Page 118 
Fill in the blank. 
_______ is a stormy planet. 
 
SOLUTION 
Jupiter is a stormy planet. 
Exercise | Q 2.5 | Page 118 
Fill in the blank. 
The Pole Star is the best example of a ______ type of star. 
 
SOLUTION 
The Pole Star is the best example of a variable type of star.  
Exercise | Q 3.1 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Venus is the planet closest to the sun. 
Page 3


Chapter 16: The Universe 
 
 
EXERCISE [PAGE 118] 
Exercise | Q 1.1 | Page 118 
Name the birth place of stars. 
 
SOLUTION 
Birth place of stars: Nebula 
Exercise | Q 1.2 | Page 118 
Name the biggest planet in the solar system 
 
SOLUTION 
Biggest planet in the solar system: Jupiter 
Exercise | Q 1.3 | Page 118 
Name the galaxy which is our neighbour. 
 
SOLUTION 
The galaxy which is our neighbour: Andromeda 
Exercise | Q 1.4 | Page 118 
Name the brightest planet in the solar system. 
 
SOLUTION 
Brightest planet in the solar system: Venus 
Exercise | Q 1.5 | Page 118 
Name the planet with largest number of satellites. 
 
SOLUTION 
Planet with largest number of satellites: Jupiter 
Exercise | Q 1.6 | Page 118 
Name the planets without a single satellite. 
 
SOLUTION 
Planets without a single satellite: Mercury and Venus 
Exercise | Q 1.7 | Page 118 
Name the planet with a rotation different from other planets. 
SOLUTION 
Planet with a rotation different from other planets: Venus and Uranus. 
Exercise | Q 1.8 | Page 118 
Name the celestial body that carries a tail along. 
 
SOLUTION 
A celestial body that carries a tail along: Comets 
Exercise | Q 2.1 | Page 118 
Fill in the blank. 
The group of galaxies of which our Milky Way is a part is called ________. 
 
SOLUTION 
The group of galaxies of which our Milky Way is a part is called 'Local Group'. 
Exercise | Q 2.2 | Page 118 
Fill in the blank. 
Comets are made of _______. 
 
SOLUTION 
Comets are made of ice and dust particles. 
Exercise | Q 2.3 | Page 118 
Fill in the blank. 
The planet _______ appears as if it is rolling along its orbit. 
 
SOLUTION 
The planet Uranus appears as if it is rolling along its orbit. 
Exercise | Q 2.4 | Page 118 
Fill in the blank. 
_______ is a stormy planet. 
 
SOLUTION 
Jupiter is a stormy planet. 
Exercise | Q 2.5 | Page 118 
Fill in the blank. 
The Pole Star is the best example of a ______ type of star. 
 
SOLUTION 
The Pole Star is the best example of a variable type of star.  
Exercise | Q 3.1 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Venus is the planet closest to the sun. 
1. Correct 
2. Incorrect 
 
SOLUTION 
No, the statement is incorrect. 
Mercury is the planet closest to the Sun. 
Exercise | Q 3.2 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Mercury is called a stormy planet. 
1. Correct 
2. Incorrect 
 
SOLUTION 
No, the statement is incorrect. 
Jupiter is called a stormy planet. 
Exercise | Q 3.3 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Jupiter is the biggest planet. 
1. correct 
2. incorrect 
 
SOLUTION 
Yes, Jupiter is the biggest planet. 
Exercise | Q 4.1 | Page 118 
Answer the following: 
What is a special characteristic of the planet Mars? 
 
SOLUTION 
The special characteristic of planet Mars is that it is red in colour. This is due to the 
presence of iron in its soil. 
Exercise | Q 4.2 | Page 118 
Answer the following: 
What are the types of galaxies? 
 
SOLUTION 
Various types of galaxies which are identified according to their shapes are: 
Page 4


Chapter 16: The Universe 
 
 
EXERCISE [PAGE 118] 
Exercise | Q 1.1 | Page 118 
Name the birth place of stars. 
 
SOLUTION 
Birth place of stars: Nebula 
Exercise | Q 1.2 | Page 118 
Name the biggest planet in the solar system 
 
SOLUTION 
Biggest planet in the solar system: Jupiter 
Exercise | Q 1.3 | Page 118 
Name the galaxy which is our neighbour. 
 
SOLUTION 
The galaxy which is our neighbour: Andromeda 
Exercise | Q 1.4 | Page 118 
Name the brightest planet in the solar system. 
 
SOLUTION 
Brightest planet in the solar system: Venus 
Exercise | Q 1.5 | Page 118 
Name the planet with largest number of satellites. 
 
SOLUTION 
Planet with largest number of satellites: Jupiter 
Exercise | Q 1.6 | Page 118 
Name the planets without a single satellite. 
 
SOLUTION 
Planets without a single satellite: Mercury and Venus 
Exercise | Q 1.7 | Page 118 
Name the planet with a rotation different from other planets. 
SOLUTION 
Planet with a rotation different from other planets: Venus and Uranus. 
Exercise | Q 1.8 | Page 118 
Name the celestial body that carries a tail along. 
 
SOLUTION 
A celestial body that carries a tail along: Comets 
Exercise | Q 2.1 | Page 118 
Fill in the blank. 
The group of galaxies of which our Milky Way is a part is called ________. 
 
SOLUTION 
The group of galaxies of which our Milky Way is a part is called 'Local Group'. 
Exercise | Q 2.2 | Page 118 
Fill in the blank. 
Comets are made of _______. 
 
SOLUTION 
Comets are made of ice and dust particles. 
Exercise | Q 2.3 | Page 118 
Fill in the blank. 
The planet _______ appears as if it is rolling along its orbit. 
 
SOLUTION 
The planet Uranus appears as if it is rolling along its orbit. 
Exercise | Q 2.4 | Page 118 
Fill in the blank. 
_______ is a stormy planet. 
 
SOLUTION 
Jupiter is a stormy planet. 
Exercise | Q 2.5 | Page 118 
Fill in the blank. 
The Pole Star is the best example of a ______ type of star. 
 
SOLUTION 
The Pole Star is the best example of a variable type of star.  
Exercise | Q 3.1 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Venus is the planet closest to the sun. 
1. Correct 
2. Incorrect 
 
SOLUTION 
No, the statement is incorrect. 
Mercury is the planet closest to the Sun. 
Exercise | Q 3.2 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Mercury is called a stormy planet. 
1. Correct 
2. Incorrect 
 
SOLUTION 
No, the statement is incorrect. 
Jupiter is called a stormy planet. 
Exercise | Q 3.3 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Jupiter is the biggest planet. 
1. correct 
2. incorrect 
 
SOLUTION 
Yes, Jupiter is the biggest planet. 
Exercise | Q 4.1 | Page 118 
Answer the following: 
What is a special characteristic of the planet Mars? 
 
SOLUTION 
The special characteristic of planet Mars is that it is red in colour. This is due to the 
presence of iron in its soil. 
Exercise | Q 4.2 | Page 118 
Answer the following: 
What are the types of galaxies? 
 
SOLUTION 
Various types of galaxies which are identified according to their shapes are: 
• Spiral galaxy: These are the spiral structures that extend from the centre into 
the disc. It consists of stars, gas and dust in a bulge at the centre and in the 
extended spiral arms. 
 
• Elliptical galaxy: These galaxies have nearly ellipsoidal shape which consists of 
stars, gas and dust. 
 
• Irregular galaxies: These galaxies don’t have a distinct regular shape. 
 
• Barred spiral galaxies: These are spiral galaxies with a central bar-shaped 
structure composed of stars. 
Exercise | Q 4.3 | Page 118 
Answer the following: 
Which celestial bodies does a galaxy include? 
 
SOLUTION 
A galaxy includes stars, cluster of stars, nebulae, clouds of gases and dusts, dead 
stars, newly born stars etc. 
Exercise | Q 4.4 | Page 118 
Answer the following: 
Name the different types of stars. 
 
SOLUTION 
The different types of stars in the universe are stated below: 
Sun-like Stars: These are particularly similar to the Sun in size but there is a lot of 
variation in terms of temperature. Examples are Alpha Centurai, Tau Ceti etc. 
 
Red Giants: These stars do not have as hot outer layer as that of the Sun with 
temperature ranging from 3000 
o
C to 4000 
o
C but they have a very high luminance than 
the Sun. They are red in color and their diameter is 10 to 100 times that of the Sun . 
 
Super Nova: They are larger and even brighter as compared to the red giant stars and 
even the Sun. They are also considered as the primary source of heavy elements in the 
universe. 
 
Binary or Twin Stars: A pair of two stars in which one revolves around the other or 
they both revolve around a common centre is known as binary or twin stars.  
 
Variable Stars: These stars have a variable shape and brightness i.e it keeps on 
changing whenever they expand or contract. Their brightness decreases when they 
expand and increases when they contract. Example is Pole Star. 
 
Exercise | Q 4.5 | Page 118 
Page 5


Chapter 16: The Universe 
 
 
EXERCISE [PAGE 118] 
Exercise | Q 1.1 | Page 118 
Name the birth place of stars. 
 
SOLUTION 
Birth place of stars: Nebula 
Exercise | Q 1.2 | Page 118 
Name the biggest planet in the solar system 
 
SOLUTION 
Biggest planet in the solar system: Jupiter 
Exercise | Q 1.3 | Page 118 
Name the galaxy which is our neighbour. 
 
SOLUTION 
The galaxy which is our neighbour: Andromeda 
Exercise | Q 1.4 | Page 118 
Name the brightest planet in the solar system. 
 
SOLUTION 
Brightest planet in the solar system: Venus 
Exercise | Q 1.5 | Page 118 
Name the planet with largest number of satellites. 
 
SOLUTION 
Planet with largest number of satellites: Jupiter 
Exercise | Q 1.6 | Page 118 
Name the planets without a single satellite. 
 
SOLUTION 
Planets without a single satellite: Mercury and Venus 
Exercise | Q 1.7 | Page 118 
Name the planet with a rotation different from other planets. 
SOLUTION 
Planet with a rotation different from other planets: Venus and Uranus. 
Exercise | Q 1.8 | Page 118 
Name the celestial body that carries a tail along. 
 
SOLUTION 
A celestial body that carries a tail along: Comets 
Exercise | Q 2.1 | Page 118 
Fill in the blank. 
The group of galaxies of which our Milky Way is a part is called ________. 
 
SOLUTION 
The group of galaxies of which our Milky Way is a part is called 'Local Group'. 
Exercise | Q 2.2 | Page 118 
Fill in the blank. 
Comets are made of _______. 
 
SOLUTION 
Comets are made of ice and dust particles. 
Exercise | Q 2.3 | Page 118 
Fill in the blank. 
The planet _______ appears as if it is rolling along its orbit. 
 
SOLUTION 
The planet Uranus appears as if it is rolling along its orbit. 
Exercise | Q 2.4 | Page 118 
Fill in the blank. 
_______ is a stormy planet. 
 
SOLUTION 
Jupiter is a stormy planet. 
Exercise | Q 2.5 | Page 118 
Fill in the blank. 
The Pole Star is the best example of a ______ type of star. 
 
SOLUTION 
The Pole Star is the best example of a variable type of star.  
Exercise | Q 3.1 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Venus is the planet closest to the sun. 
1. Correct 
2. Incorrect 
 
SOLUTION 
No, the statement is incorrect. 
Mercury is the planet closest to the Sun. 
Exercise | Q 3.2 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Mercury is called a stormy planet. 
1. Correct 
2. Incorrect 
 
SOLUTION 
No, the statement is incorrect. 
Jupiter is called a stormy planet. 
Exercise | Q 3.3 | Page 118 
Say if the statement given below is right or wrong. Rewrite the statement after 
correcting them. 
Jupiter is the biggest planet. 
1. correct 
2. incorrect 
 
SOLUTION 
Yes, Jupiter is the biggest planet. 
Exercise | Q 4.1 | Page 118 
Answer the following: 
What is a special characteristic of the planet Mars? 
 
SOLUTION 
The special characteristic of planet Mars is that it is red in colour. This is due to the 
presence of iron in its soil. 
Exercise | Q 4.2 | Page 118 
Answer the following: 
What are the types of galaxies? 
 
SOLUTION 
Various types of galaxies which are identified according to their shapes are: 
• Spiral galaxy: These are the spiral structures that extend from the centre into 
the disc. It consists of stars, gas and dust in a bulge at the centre and in the 
extended spiral arms. 
 
• Elliptical galaxy: These galaxies have nearly ellipsoidal shape which consists of 
stars, gas and dust. 
 
• Irregular galaxies: These galaxies don’t have a distinct regular shape. 
 
• Barred spiral galaxies: These are spiral galaxies with a central bar-shaped 
structure composed of stars. 
Exercise | Q 4.3 | Page 118 
Answer the following: 
Which celestial bodies does a galaxy include? 
 
SOLUTION 
A galaxy includes stars, cluster of stars, nebulae, clouds of gases and dusts, dead 
stars, newly born stars etc. 
Exercise | Q 4.4 | Page 118 
Answer the following: 
Name the different types of stars. 
 
SOLUTION 
The different types of stars in the universe are stated below: 
Sun-like Stars: These are particularly similar to the Sun in size but there is a lot of 
variation in terms of temperature. Examples are Alpha Centurai, Tau Ceti etc. 
 
Red Giants: These stars do not have as hot outer layer as that of the Sun with 
temperature ranging from 3000 
o
C to 4000 
o
C but they have a very high luminance than 
the Sun. They are red in color and their diameter is 10 to 100 times that of the Sun . 
 
Super Nova: They are larger and even brighter as compared to the red giant stars and 
even the Sun. They are also considered as the primary source of heavy elements in the 
universe. 
 
Binary or Twin Stars: A pair of two stars in which one revolves around the other or 
they both revolve around a common centre is known as binary or twin stars.  
 
Variable Stars: These stars have a variable shape and brightness i.e it keeps on 
changing whenever they expand or contract. Their brightness decreases when they 
expand and increases when they contract. Example is Pole Star. 
 
Exercise | Q 4.5 | Page 118 
Answer the following: 
What are the types of comets and on what basis are they classified? 
 
SOLUTION 
Comets are the solar system bodies that are usually spherical in shape and develop tail 
when they come near the Sun. Comets become visible when they are close to the Sun 
and the Earth. 
Comets can be categorized into two groups depending on how long they take to 
complete one revolution around the sun. These are: 
• Long Period Comets: These comets complete one revolution around the Sun in 
200 and more years. Great Comet of 1843 is one of the examples of this type. 
 
• Short Period Comets: These comets complete one revolution around the Sun in 
years less than 200. One of the examples is Halley's comet that takes 76 years 
to complete the revolution. It last appeared in 1985. 
 
Exercise | Q 4.6 | Page 118 
Answer the following: 
What is the difference between meteors and meteorites? 
 
SOLUTION 
Meteors: These are rocky pieces originating from the asteroid belt and enter the Earth’s 
atmosphere as a result of its gravitational pull. On entering the Earth’s atmosphere, they 
acquire very high speeds. These high speeds of meteors cause friction with the Earth’s 
atmosphere and thus the meteors heat up and evaporate completely. Meteors are also 
known as shooting stars. 
 
Meteorites: These are the unburnt part of meteors which fall to the surface of Earth on 
ocassions when the meteors do not burn completely in the atmosphere itself. 
Exercise | Q 4.7 | Page 118 
Answer the following: 
What are the characteristics of the planet Neptune ? 
 
SOLUTION 
Following are the characteristics of planet Neptune: 
• A season on this planet lasts for about 41 years. 
• Wind blows with extremely high speed on this planet. 
 
 
 
Exercise | Q 5 | Page 118