Textbook Solutions: Work and Energy | General Science Class 6 (Maharashtra Board) PDF Download

 Page 1


Chapter 11: Work and Energy 
 
 
EXERCISE [PAGE 83] 
Exercise | Q 1.1 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
A bucketful of water is to be drawn from a well _________ will be done when a 
________ is applied to do this because there will be a ________ of water. 
(displacement, work, force) 
 
SOLUTION 
A bucketful of water is to be drawn from a well. Work will be done when a force is 
applied to do this because there will be a displacement of water. 
Exercise | Q 1.2 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
If a ball is dropped on the sloping roof of a house, it acquires _________ and falls on 
the ground. That is the transformation of _________ energy into ___________ energy 
takes place. 
(kinetic, potential, motion) 
 
SOLUTION 
If a ball is dropped on the sloping roof of a house, it acquires motion and falls on the 
ground. That is, the transformation of potential energy into kinetic energy takes place. 
Exercise | Q 1.3 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of ________ energy into __________ energy. 
(light, atom, chemical, solar) 
 
SOLUTION 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of chemical energy into light energy. 
Exercise | Q 1.4 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
The solar cooker is an application of the _________ energy of the sun, while solar cells, 
solar lamps are applications of the ___________ energy of the sun. 
(light, chemical, heat) 
 
SOLUTION 
The solar cooker is an application of the heat energy of the sun, while solar cells, solar 
lamps are applications of the light energy of the sun. 
Page 2


Chapter 11: Work and Energy 
 
 
EXERCISE [PAGE 83] 
Exercise | Q 1.1 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
A bucketful of water is to be drawn from a well _________ will be done when a 
________ is applied to do this because there will be a ________ of water. 
(displacement, work, force) 
 
SOLUTION 
A bucketful of water is to be drawn from a well. Work will be done when a force is 
applied to do this because there will be a displacement of water. 
Exercise | Q 1.2 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
If a ball is dropped on the sloping roof of a house, it acquires _________ and falls on 
the ground. That is the transformation of _________ energy into ___________ energy 
takes place. 
(kinetic, potential, motion) 
 
SOLUTION 
If a ball is dropped on the sloping roof of a house, it acquires motion and falls on the 
ground. That is, the transformation of potential energy into kinetic energy takes place. 
Exercise | Q 1.3 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of ________ energy into __________ energy. 
(light, atom, chemical, solar) 
 
SOLUTION 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of chemical energy into light energy. 
Exercise | Q 1.4 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
The solar cooker is an application of the _________ energy of the sun, while solar cells, 
solar lamps are applications of the ___________ energy of the sun. 
(light, chemical, heat) 
 
SOLUTION 
The solar cooker is an application of the heat energy of the sun, while solar cells, solar 
lamps are applications of the light energy of the sun. 
Exercise | Q 1.5 | Page 83 
Fill in the blank with the appropriate term from the brackets. 
One labourer carried four pans of road metal through a distance of 100 metres. If he 
carries two pans of road metal through a 200-metre distance _________ work will be 
done. 
(equal, more, less) 
 
SOLUTION 
One labourer carried four pans of road metal through a distance of 100 metres. If he 
carries two pans of road metal through a 200-metre distance equal work will be done. 
Exercise | Q 1.6 | Page 83 
Fill in the blank with the appropriate term from the brackets. 
The capacity that an object has for doing work is called __________. 
(energy, displacement, force) 
 
SOLUTION 
The capacity that an object has for doing work is called energy. 
Exercise | Q 2 | Page 83 
Match the pairs. 
 
Group 'A' Group 'B' 
(1) Rolling object (a) Heat energy 
(2) Food (b) Atomic energy 
(3) Stretched bow (c) Kinetic energy 
(4) Sunlight (d) Potential energy 
(5) Uranium (e) Chemical energy 
SOLUTION 
 
Group 'A' Group 'B' 
(1) Rolling object (c) Kinetic energy 
(2) Food (e) Chemical energy 
(3) Stretched bow (d) Potential energy 
(4) Sunlight (a) Heat energy 
(5) Uranium (b) Atomic energy 
 
Exercise | Q 3.1 | Page 83 
Page 3


Chapter 11: Work and Energy 
 
 
EXERCISE [PAGE 83] 
Exercise | Q 1.1 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
A bucketful of water is to be drawn from a well _________ will be done when a 
________ is applied to do this because there will be a ________ of water. 
(displacement, work, force) 
 
SOLUTION 
A bucketful of water is to be drawn from a well. Work will be done when a force is 
applied to do this because there will be a displacement of water. 
Exercise | Q 1.2 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
If a ball is dropped on the sloping roof of a house, it acquires _________ and falls on 
the ground. That is the transformation of _________ energy into ___________ energy 
takes place. 
(kinetic, potential, motion) 
 
SOLUTION 
If a ball is dropped on the sloping roof of a house, it acquires motion and falls on the 
ground. That is, the transformation of potential energy into kinetic energy takes place. 
Exercise | Q 1.3 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of ________ energy into __________ energy. 
(light, atom, chemical, solar) 
 
SOLUTION 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of chemical energy into light energy. 
Exercise | Q 1.4 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
The solar cooker is an application of the _________ energy of the sun, while solar cells, 
solar lamps are applications of the ___________ energy of the sun. 
(light, chemical, heat) 
 
SOLUTION 
The solar cooker is an application of the heat energy of the sun, while solar cells, solar 
lamps are applications of the light energy of the sun. 
Exercise | Q 1.5 | Page 83 
Fill in the blank with the appropriate term from the brackets. 
One labourer carried four pans of road metal through a distance of 100 metres. If he 
carries two pans of road metal through a 200-metre distance _________ work will be 
done. 
(equal, more, less) 
 
SOLUTION 
One labourer carried four pans of road metal through a distance of 100 metres. If he 
carries two pans of road metal through a 200-metre distance equal work will be done. 
Exercise | Q 1.6 | Page 83 
Fill in the blank with the appropriate term from the brackets. 
The capacity that an object has for doing work is called __________. 
(energy, displacement, force) 
 
SOLUTION 
The capacity that an object has for doing work is called energy. 
Exercise | Q 2 | Page 83 
Match the pairs. 
 
Group 'A' Group 'B' 
(1) Rolling object (a) Heat energy 
(2) Food (b) Atomic energy 
(3) Stretched bow (c) Kinetic energy 
(4) Sunlight (d) Potential energy 
(5) Uranium (e) Chemical energy 
SOLUTION 
 
Group 'A' Group 'B' 
(1) Rolling object (c) Kinetic energy 
(2) Food (e) Chemical energy 
(3) Stretched bow (d) Potential energy 
(4) Sunlight (a) Heat energy 
(5) Uranium (b) Atomic energy 
 
Exercise | Q 3.1 | Page 83 
Can you tell when can we say that displacement has taken place? 
 
SOLUTION 
We can say that displacement has taken place when the initial and final position of an 
object is different i.e. there is some distance between the initial and final position of an 
object. 
Exercise | Q 3.2 | Page 83 
Can you tell what should be taken into account for measuring work? 
 
SOLUTION 
While measuring work, the magnitude of force applied on an object and the 
displacement of an object should be taken into account. 
Exercise | Q 3.3 | Page 83 
Can you tell what are the various forms of energy? 
 
SOLUTION 
Various forms of energy are: 
• Mechanical: Kinetic and potential energy are two types of mechanical energy. 
• Light 
• Heat 
• Muscular 
• Sound 
• Magnetic 
• Electrical 
• Chemical 
• Nuclear 
 
Exercise | Q 3.4 | Page 83 
Can you tell describe one natural chain of transformation of energy? 
 
SOLUTION 
When a candle is lit, the chemical energy stored in its wax gets converted to heat and 
light energy. 
Exercise | Q 3.5 | Page 83 
Can you tell why should we save energy? 
Page 4


Chapter 11: Work and Energy 
 
 
EXERCISE [PAGE 83] 
Exercise | Q 1.1 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
A bucketful of water is to be drawn from a well _________ will be done when a 
________ is applied to do this because there will be a ________ of water. 
(displacement, work, force) 
 
SOLUTION 
A bucketful of water is to be drawn from a well. Work will be done when a force is 
applied to do this because there will be a displacement of water. 
Exercise | Q 1.2 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
If a ball is dropped on the sloping roof of a house, it acquires _________ and falls on 
the ground. That is the transformation of _________ energy into ___________ energy 
takes place. 
(kinetic, potential, motion) 
 
SOLUTION 
If a ball is dropped on the sloping roof of a house, it acquires motion and falls on the 
ground. That is, the transformation of potential energy into kinetic energy takes place. 
Exercise | Q 1.3 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of ________ energy into __________ energy. 
(light, atom, chemical, solar) 
 
SOLUTION 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of chemical energy into light energy. 
Exercise | Q 1.4 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
The solar cooker is an application of the _________ energy of the sun, while solar cells, 
solar lamps are applications of the ___________ energy of the sun. 
(light, chemical, heat) 
 
SOLUTION 
The solar cooker is an application of the heat energy of the sun, while solar cells, solar 
lamps are applications of the light energy of the sun. 
Exercise | Q 1.5 | Page 83 
Fill in the blank with the appropriate term from the brackets. 
One labourer carried four pans of road metal through a distance of 100 metres. If he 
carries two pans of road metal through a 200-metre distance _________ work will be 
done. 
(equal, more, less) 
 
SOLUTION 
One labourer carried four pans of road metal through a distance of 100 metres. If he 
carries two pans of road metal through a 200-metre distance equal work will be done. 
Exercise | Q 1.6 | Page 83 
Fill in the blank with the appropriate term from the brackets. 
The capacity that an object has for doing work is called __________. 
(energy, displacement, force) 
 
SOLUTION 
The capacity that an object has for doing work is called energy. 
Exercise | Q 2 | Page 83 
Match the pairs. 
 
Group 'A' Group 'B' 
(1) Rolling object (a) Heat energy 
(2) Food (b) Atomic energy 
(3) Stretched bow (c) Kinetic energy 
(4) Sunlight (d) Potential energy 
(5) Uranium (e) Chemical energy 
SOLUTION 
 
Group 'A' Group 'B' 
(1) Rolling object (c) Kinetic energy 
(2) Food (e) Chemical energy 
(3) Stretched bow (d) Potential energy 
(4) Sunlight (a) Heat energy 
(5) Uranium (b) Atomic energy 
 
Exercise | Q 3.1 | Page 83 
Can you tell when can we say that displacement has taken place? 
 
SOLUTION 
We can say that displacement has taken place when the initial and final position of an 
object is different i.e. there is some distance between the initial and final position of an 
object. 
Exercise | Q 3.2 | Page 83 
Can you tell what should be taken into account for measuring work? 
 
SOLUTION 
While measuring work, the magnitude of force applied on an object and the 
displacement of an object should be taken into account. 
Exercise | Q 3.3 | Page 83 
Can you tell what are the various forms of energy? 
 
SOLUTION 
Various forms of energy are: 
• Mechanical: Kinetic and potential energy are two types of mechanical energy. 
• Light 
• Heat 
• Muscular 
• Sound 
• Magnetic 
• Electrical 
• Chemical 
• Nuclear 
 
Exercise | Q 3.4 | Page 83 
Can you tell describe one natural chain of transformation of energy? 
 
SOLUTION 
When a candle is lit, the chemical energy stored in its wax gets converted to heat and 
light energy. 
Exercise | Q 3.5 | Page 83 
Can you tell why should we save energy? 
SOLUTION 
We should save energy because of the following: 
• To save money: Wasting energy is the same as wasting money. We all know 
that the electricity we use in our homes isn't free but it costs us a lot. So, saving 
energy will save money too.  
 
• To preserve conventional sources: Most of the energy we use in our daily life 
is generated using conventional energy resources, such as coal, petroleum, etc. 
These energy resources are non-renewable in nature. So, if we waste energy, 
we are indirectly wasting these resources and hence a day will come when these 
resources will get extinct. So to preserve these non-renewable resources, we 
should save energy. 
 
• To keep the environment clean: Energy saving will help us keep the 
environment clean. Less energy usage will result in less energy production using 
coal, petroleum, and other conventional sources which pollutes the environment 
when burnt. 
 
Exercise | Q 3.6 | Page 83 
Can you tell what is ‘green energy’? 
 
SOLUTION 
The forms of energy which do not produce smoke and carbon gases such as carbon 
dioxide or carbon monoxide are known as green energy. 
Exercise | Q 3.7 | Page 83 
Can you tell what are the non-conventional energy resources? 
 
SOLUTION 
Non-conventional energy resources are inexhaustible in nature and can be used in 
various forms again and again. For example, wind energy, tidal energy, solar energy, 
etc. are non-conventional energy resources. 
Exercise | Q 3.8 | Page 83 
Can you tell which forms of energy from the sun are used in solar energy devices? 
 
SOLUTION 
Heat and light energy of Sun is used in solar energy devices. 
Exercise | Q 3.9 | Page 83 
Can you tell why should we maximise the use of non-conventional energy resources? 
Page 5


Chapter 11: Work and Energy 
 
 
EXERCISE [PAGE 83] 
Exercise | Q 1.1 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
A bucketful of water is to be drawn from a well _________ will be done when a 
________ is applied to do this because there will be a ________ of water. 
(displacement, work, force) 
 
SOLUTION 
A bucketful of water is to be drawn from a well. Work will be done when a force is 
applied to do this because there will be a displacement of water. 
Exercise | Q 1.2 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
If a ball is dropped on the sloping roof of a house, it acquires _________ and falls on 
the ground. That is the transformation of _________ energy into ___________ energy 
takes place. 
(kinetic, potential, motion) 
 
SOLUTION 
If a ball is dropped on the sloping roof of a house, it acquires motion and falls on the 
ground. That is, the transformation of potential energy into kinetic energy takes place. 
Exercise | Q 1.3 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of ________ energy into __________ energy. 
(light, atom, chemical, solar) 
 
SOLUTION 
You might have seen some beautiful fireworks during Diwali. It is an example of the 
transformation of chemical energy into light energy. 
Exercise | Q 1.4 | Page 83 
Fill in the blanks with the appropriate term from the brackets. 
The solar cooker is an application of the _________ energy of the sun, while solar cells, 
solar lamps are applications of the ___________ energy of the sun. 
(light, chemical, heat) 
 
SOLUTION 
The solar cooker is an application of the heat energy of the sun, while solar cells, solar 
lamps are applications of the light energy of the sun. 
Exercise | Q 1.5 | Page 83 
Fill in the blank with the appropriate term from the brackets. 
One labourer carried four pans of road metal through a distance of 100 metres. If he 
carries two pans of road metal through a 200-metre distance _________ work will be 
done. 
(equal, more, less) 
 
SOLUTION 
One labourer carried four pans of road metal through a distance of 100 metres. If he 
carries two pans of road metal through a 200-metre distance equal work will be done. 
Exercise | Q 1.6 | Page 83 
Fill in the blank with the appropriate term from the brackets. 
The capacity that an object has for doing work is called __________. 
(energy, displacement, force) 
 
SOLUTION 
The capacity that an object has for doing work is called energy. 
Exercise | Q 2 | Page 83 
Match the pairs. 
 
Group 'A' Group 'B' 
(1) Rolling object (a) Heat energy 
(2) Food (b) Atomic energy 
(3) Stretched bow (c) Kinetic energy 
(4) Sunlight (d) Potential energy 
(5) Uranium (e) Chemical energy 
SOLUTION 
 
Group 'A' Group 'B' 
(1) Rolling object (c) Kinetic energy 
(2) Food (e) Chemical energy 
(3) Stretched bow (d) Potential energy 
(4) Sunlight (a) Heat energy 
(5) Uranium (b) Atomic energy 
 
Exercise | Q 3.1 | Page 83 
Can you tell when can we say that displacement has taken place? 
 
SOLUTION 
We can say that displacement has taken place when the initial and final position of an 
object is different i.e. there is some distance between the initial and final position of an 
object. 
Exercise | Q 3.2 | Page 83 
Can you tell what should be taken into account for measuring work? 
 
SOLUTION 
While measuring work, the magnitude of force applied on an object and the 
displacement of an object should be taken into account. 
Exercise | Q 3.3 | Page 83 
Can you tell what are the various forms of energy? 
 
SOLUTION 
Various forms of energy are: 
• Mechanical: Kinetic and potential energy are two types of mechanical energy. 
• Light 
• Heat 
• Muscular 
• Sound 
• Magnetic 
• Electrical 
• Chemical 
• Nuclear 
 
Exercise | Q 3.4 | Page 83 
Can you tell describe one natural chain of transformation of energy? 
 
SOLUTION 
When a candle is lit, the chemical energy stored in its wax gets converted to heat and 
light energy. 
Exercise | Q 3.5 | Page 83 
Can you tell why should we save energy? 
SOLUTION 
We should save energy because of the following: 
• To save money: Wasting energy is the same as wasting money. We all know 
that the electricity we use in our homes isn't free but it costs us a lot. So, saving 
energy will save money too.  
 
• To preserve conventional sources: Most of the energy we use in our daily life 
is generated using conventional energy resources, such as coal, petroleum, etc. 
These energy resources are non-renewable in nature. So, if we waste energy, 
we are indirectly wasting these resources and hence a day will come when these 
resources will get extinct. So to preserve these non-renewable resources, we 
should save energy. 
 
• To keep the environment clean: Energy saving will help us keep the 
environment clean. Less energy usage will result in less energy production using 
coal, petroleum, and other conventional sources which pollutes the environment 
when burnt. 
 
Exercise | Q 3.6 | Page 83 
Can you tell what is ‘green energy’? 
 
SOLUTION 
The forms of energy which do not produce smoke and carbon gases such as carbon 
dioxide or carbon monoxide are known as green energy. 
Exercise | Q 3.7 | Page 83 
Can you tell what are the non-conventional energy resources? 
 
SOLUTION 
Non-conventional energy resources are inexhaustible in nature and can be used in 
various forms again and again. For example, wind energy, tidal energy, solar energy, 
etc. are non-conventional energy resources. 
Exercise | Q 3.8 | Page 83 
Can you tell which forms of energy from the sun are used in solar energy devices? 
 
SOLUTION 
Heat and light energy of Sun is used in solar energy devices. 
Exercise | Q 3.9 | Page 83 
Can you tell why should we maximise the use of non-conventional energy resources? 
SOLUTION 
Because of the increase in population and usage of energy resources, there is a 
potential danger of limited reserves of conventional energy resources, such as coal, 
petrol, diesel, crude oil, and natural gas, getting exhausted in the future. Therefore, it 
will be better to maximise the use of non-conventional energy resources to remove the 
danger of extinction of conventional energy resources. 
Exercise | Q 4.1 | Page 83 
Who is the odd-one-out? 
Diesel, crude oil, natural gas, wind 
 
SOLUTION 
Wind is the odd one out as it is a non-conventional energy resource. The rest are 
conventional energy resources. 
Exercise | Q 4.2 | Page 83 
Who is the odd-one-out? 
A running car, hauling a log, a book kept on a table, picking up the school bag. 
 
SOLUTION 
A book kept on a table is the odd one out as no work is being done in this case. In the 
rest of the cases, work is being done. 
Exercise | Q 4.3 | Page 83 
Who is the odd-one-out? 
Sunlight, wind, waves, petrol 
 
SOLUTION 
Petrol is the odd one out as it is a conventional energy resource. The rest are non -
conventional energy resources. 
Exercise | Q 4.4 | Page 83 
Who is the odd-one-out? 
Leaving the fan on in a vacant room, leaving the TV on while working, using AC during 
winter, putting off the light when going out. 
 
SOLUTION 
Putting off the light when going out is the odd one out as it is one of the measures of 
saving energy. The rest involves wastage of energy. 
Exercise | Q 5 | Page 83 
Find out the types of energy from the following puzzle.