NCERT Textbook: Fun with Logic | Information Technology for Class 9 PDF Download

 Page 1


Jason is the sports captain of his school. He was thrilled 
to receive the Chief Minister’s scholarship for his 
outstanding performance in sports. But his scholarship 
amount has to be credited to his bank account and Jason 
does not have a savings bank account. He does not even 
know how to open a bank account. So he approaches 
a bank in his locality and the bank employee at the 
helpdesk gives him instructions to complete the task as 
given below.
1. Take the account opening form from the counter. 
2. Fill the details in the form carefully.
3. Put your signature at the designated place on the 
form.
4. Attach a copy of the photo identity card.
5. Submit the form at the counter with a minimum 
deposit.
After understanding the process to open a bank account, 
Jason gets on to work. When he went to complete the 
final step, which was to submit the form, the clerk 
informed him that his account could not be opened. 
What would have gone wrong? What reasons can you 
think of?
_____________________________  
_____________________________                   
_____________________________    
Fun with Logic
Chapter
8
Chapter 8.indd   102 7/22/2020   12:36:46 PM
2024-25
Page 2


Jason is the sports captain of his school. He was thrilled 
to receive the Chief Minister’s scholarship for his 
outstanding performance in sports. But his scholarship 
amount has to be credited to his bank account and Jason 
does not have a savings bank account. He does not even 
know how to open a bank account. So he approaches 
a bank in his locality and the bank employee at the 
helpdesk gives him instructions to complete the task as 
given below.
1. Take the account opening form from the counter. 
2. Fill the details in the form carefully.
3. Put your signature at the designated place on the 
form.
4. Attach a copy of the photo identity card.
5. Submit the form at the counter with a minimum 
deposit.
After understanding the process to open a bank account, 
Jason gets on to work. When he went to complete the 
final step, which was to submit the form, the clerk 
informed him that his account could not be opened. 
What would have gone wrong? What reasons can you 
think of?
_____________________________  
_____________________________                   
_____________________________    
Fun with Logic
Chapter
8
Chapter 8.indd   102 7/22/2020   12:36:46 PM
2024-25
Fun with Logic 103
Once again Jason checked the steps to open the bank 
account. It was then that he realized that he had missed 
Step no 3 which was to put signature at the designated 
place on the form and that was why the task of opening 
the bank account could not be completed. Thereafter, 
he put his signature and submitted his form again. His 
account was finally successfully opened.
Have you ever faced such a problem while completing 
a particular task? What happens if you do not follow 
the correct sequence of steps? Will you get the desired 
result?
Activity 1
On the eve of the Independence day, you want to listen to 
the Prime Minister’s address on the radio. Write the steps 
to complete the task.
_______________________________________________________   
_______________________________________________________
_______________________________________________________
_______________________________________________________
_______________________________________________________
_______________________________________________________
Now ask your friend to follow the steps written by you. 
Are you able to tune in to listen to the Prime Minister’s 
address? What happens if you interchange any of the 
steps? Are you still able to get the desired result?  
By now, you must have understood the importance of 
instructions and the sequence of instructions to 
complete a particular task. To accomplish a task and 
to get the desired output, you have to mention each 
instruction clearly, sequentially and logically, as 
shown in Fig. 8.1. So to achieve a task, the steps are 
listed below.
1. Clearly identify the output that you want. 
2. Analyse the instructions required to find a solution 
to get the desired output.
3. Finalise and give instructions in the proper 
sequence.
4. Verify whether the output produced is as desired 
by you in Step 1.
Chapter 8.indd   103 7/22/2020   12:36:46 PM
2024-25
Page 3


Jason is the sports captain of his school. He was thrilled 
to receive the Chief Minister’s scholarship for his 
outstanding performance in sports. But his scholarship 
amount has to be credited to his bank account and Jason 
does not have a savings bank account. He does not even 
know how to open a bank account. So he approaches 
a bank in his locality and the bank employee at the 
helpdesk gives him instructions to complete the task as 
given below.
1. Take the account opening form from the counter. 
2. Fill the details in the form carefully.
3. Put your signature at the designated place on the 
form.
4. Attach a copy of the photo identity card.
5. Submit the form at the counter with a minimum 
deposit.
After understanding the process to open a bank account, 
Jason gets on to work. When he went to complete the 
final step, which was to submit the form, the clerk 
informed him that his account could not be opened. 
What would have gone wrong? What reasons can you 
think of?
_____________________________  
_____________________________                   
_____________________________    
Fun with Logic
Chapter
8
Chapter 8.indd   102 7/22/2020   12:36:46 PM
2024-25
Fun with Logic 103
Once again Jason checked the steps to open the bank 
account. It was then that he realized that he had missed 
Step no 3 which was to put signature at the designated 
place on the form and that was why the task of opening 
the bank account could not be completed. Thereafter, 
he put his signature and submitted his form again. His 
account was finally successfully opened.
Have you ever faced such a problem while completing 
a particular task? What happens if you do not follow 
the correct sequence of steps? Will you get the desired 
result?
Activity 1
On the eve of the Independence day, you want to listen to 
the Prime Minister’s address on the radio. Write the steps 
to complete the task.
_______________________________________________________   
_______________________________________________________
_______________________________________________________
_______________________________________________________
_______________________________________________________
_______________________________________________________
Now ask your friend to follow the steps written by you. 
Are you able to tune in to listen to the Prime Minister’s 
address? What happens if you interchange any of the 
steps? Are you still able to get the desired result?  
By now, you must have understood the importance of 
instructions and the sequence of instructions to 
complete a particular task. To accomplish a task and 
to get the desired output, you have to mention each 
instruction clearly, sequentially and logically, as 
shown in Fig. 8.1. So to achieve a task, the steps are 
listed below.
1. Clearly identify the output that you want. 
2. Analyse the instructions required to find a solution 
to get the desired output.
3. Finalise and give instructions in the proper 
sequence.
4. Verify whether the output produced is as desired 
by you in Step 1.
Chapter 8.indd   103 7/22/2020   12:36:46 PM
2024-25
ICT Tex Tbook — Class Ix 104
Identify the Output • Do you clearly know what output has to be produced?
Analyse
• Do you have multiple solutions?
• Which is the best possible option?
• Have you identified the correct sequence of 
instructions?
Finalise  
Instructions
• Give the instructions in logical sequence.
Verify the Output • Is the output same as you had identified in Step 1?
Fig. 8.1: Steps to complete a task
Consider a situation where the Twirly cat has lost the 
way to her house as shown in Fig. 8.2.
Fig. 8.2: Twirly cat finding its way
What instructions would you give her to help her reach 
the house? Write them in the space provided below:
Chapter 8.indd   104 7/22/2020   12:36:47 PM
2024-25
Page 4


Jason is the sports captain of his school. He was thrilled 
to receive the Chief Minister’s scholarship for his 
outstanding performance in sports. But his scholarship 
amount has to be credited to his bank account and Jason 
does not have a savings bank account. He does not even 
know how to open a bank account. So he approaches 
a bank in his locality and the bank employee at the 
helpdesk gives him instructions to complete the task as 
given below.
1. Take the account opening form from the counter. 
2. Fill the details in the form carefully.
3. Put your signature at the designated place on the 
form.
4. Attach a copy of the photo identity card.
5. Submit the form at the counter with a minimum 
deposit.
After understanding the process to open a bank account, 
Jason gets on to work. When he went to complete the 
final step, which was to submit the form, the clerk 
informed him that his account could not be opened. 
What would have gone wrong? What reasons can you 
think of?
_____________________________  
_____________________________                   
_____________________________    
Fun with Logic
Chapter
8
Chapter 8.indd   102 7/22/2020   12:36:46 PM
2024-25
Fun with Logic 103
Once again Jason checked the steps to open the bank 
account. It was then that he realized that he had missed 
Step no 3 which was to put signature at the designated 
place on the form and that was why the task of opening 
the bank account could not be completed. Thereafter, 
he put his signature and submitted his form again. His 
account was finally successfully opened.
Have you ever faced such a problem while completing 
a particular task? What happens if you do not follow 
the correct sequence of steps? Will you get the desired 
result?
Activity 1
On the eve of the Independence day, you want to listen to 
the Prime Minister’s address on the radio. Write the steps 
to complete the task.
_______________________________________________________   
_______________________________________________________
_______________________________________________________
_______________________________________________________
_______________________________________________________
_______________________________________________________
Now ask your friend to follow the steps written by you. 
Are you able to tune in to listen to the Prime Minister’s 
address? What happens if you interchange any of the 
steps? Are you still able to get the desired result?  
By now, you must have understood the importance of 
instructions and the sequence of instructions to 
complete a particular task. To accomplish a task and 
to get the desired output, you have to mention each 
instruction clearly, sequentially and logically, as 
shown in Fig. 8.1. So to achieve a task, the steps are 
listed below.
1. Clearly identify the output that you want. 
2. Analyse the instructions required to find a solution 
to get the desired output.
3. Finalise and give instructions in the proper 
sequence.
4. Verify whether the output produced is as desired 
by you in Step 1.
Chapter 8.indd   103 7/22/2020   12:36:46 PM
2024-25
ICT Tex Tbook — Class Ix 104
Identify the Output • Do you clearly know what output has to be produced?
Analyse
• Do you have multiple solutions?
• Which is the best possible option?
• Have you identified the correct sequence of 
instructions?
Finalise  
Instructions
• Give the instructions in logical sequence.
Verify the Output • Is the output same as you had identified in Step 1?
Fig. 8.1: Steps to complete a task
Consider a situation where the Twirly cat has lost the 
way to her house as shown in Fig. 8.2.
Fig. 8.2: Twirly cat finding its way
What instructions would you give her to help her reach 
the house? Write them in the space provided below:
Chapter 8.indd   104 7/22/2020   12:36:47 PM
2024-25
Fun with Logic 105
Scratch is a free 
programming 
language developed 
by MIT in the 
 year 2005. 
Step 1: Move forward by 10 steps.
Step 2: Turn right by 90 degrees
Have you given the right instructions? Will Twirly cat 
reach its home? Can you check the given instructions 
using any software application or tool? Yes, you can 
do so by using the Scratch application. Using this 
application you can create your own stories, games and 
various other animations using simple drag and drop 
instructions.
Animations in Scratch can be created offline as well as 
online mode. As it is an open source software you can 
download it from https://scratch.mit.edu , install it on 
your computer and then use it. You can also create and 
share your animations online using the above URL.
On opening Scratch, you see the interface as shown in 
Fig. 8.3. Each object on the scratch window is called a 
sprite. This object can be any person, an animal, an 
automobile, a building or even text.
After learning about the Scratch interface let us now 
verify the steps that would take out Twirly cat home. In 
Fig. 8.3: Scratch Interface
Chapter 8.indd   105 7/22/2020   12:36:48 PM
2024-25
Page 5


Jason is the sports captain of his school. He was thrilled 
to receive the Chief Minister’s scholarship for his 
outstanding performance in sports. But his scholarship 
amount has to be credited to his bank account and Jason 
does not have a savings bank account. He does not even 
know how to open a bank account. So he approaches 
a bank in his locality and the bank employee at the 
helpdesk gives him instructions to complete the task as 
given below.
1. Take the account opening form from the counter. 
2. Fill the details in the form carefully.
3. Put your signature at the designated place on the 
form.
4. Attach a copy of the photo identity card.
5. Submit the form at the counter with a minimum 
deposit.
After understanding the process to open a bank account, 
Jason gets on to work. When he went to complete the 
final step, which was to submit the form, the clerk 
informed him that his account could not be opened. 
What would have gone wrong? What reasons can you 
think of?
_____________________________  
_____________________________                   
_____________________________    
Fun with Logic
Chapter
8
Chapter 8.indd   102 7/22/2020   12:36:46 PM
2024-25
Fun with Logic 103
Once again Jason checked the steps to open the bank 
account. It was then that he realized that he had missed 
Step no 3 which was to put signature at the designated 
place on the form and that was why the task of opening 
the bank account could not be completed. Thereafter, 
he put his signature and submitted his form again. His 
account was finally successfully opened.
Have you ever faced such a problem while completing 
a particular task? What happens if you do not follow 
the correct sequence of steps? Will you get the desired 
result?
Activity 1
On the eve of the Independence day, you want to listen to 
the Prime Minister’s address on the radio. Write the steps 
to complete the task.
_______________________________________________________   
_______________________________________________________
_______________________________________________________
_______________________________________________________
_______________________________________________________
_______________________________________________________
Now ask your friend to follow the steps written by you. 
Are you able to tune in to listen to the Prime Minister’s 
address? What happens if you interchange any of the 
steps? Are you still able to get the desired result?  
By now, you must have understood the importance of 
instructions and the sequence of instructions to 
complete a particular task. To accomplish a task and 
to get the desired output, you have to mention each 
instruction clearly, sequentially and logically, as 
shown in Fig. 8.1. So to achieve a task, the steps are 
listed below.
1. Clearly identify the output that you want. 
2. Analyse the instructions required to find a solution 
to get the desired output.
3. Finalise and give instructions in the proper 
sequence.
4. Verify whether the output produced is as desired 
by you in Step 1.
Chapter 8.indd   103 7/22/2020   12:36:46 PM
2024-25
ICT Tex Tbook — Class Ix 104
Identify the Output • Do you clearly know what output has to be produced?
Analyse
• Do you have multiple solutions?
• Which is the best possible option?
• Have you identified the correct sequence of 
instructions?
Finalise  
Instructions
• Give the instructions in logical sequence.
Verify the Output • Is the output same as you had identified in Step 1?
Fig. 8.1: Steps to complete a task
Consider a situation where the Twirly cat has lost the 
way to her house as shown in Fig. 8.2.
Fig. 8.2: Twirly cat finding its way
What instructions would you give her to help her reach 
the house? Write them in the space provided below:
Chapter 8.indd   104 7/22/2020   12:36:47 PM
2024-25
Fun with Logic 105
Scratch is a free 
programming 
language developed 
by MIT in the 
 year 2005. 
Step 1: Move forward by 10 steps.
Step 2: Turn right by 90 degrees
Have you given the right instructions? Will Twirly cat 
reach its home? Can you check the given instructions 
using any software application or tool? Yes, you can 
do so by using the Scratch application. Using this 
application you can create your own stories, games and 
various other animations using simple drag and drop 
instructions.
Animations in Scratch can be created offline as well as 
online mode. As it is an open source software you can 
download it from https://scratch.mit.edu , install it on 
your computer and then use it. You can also create and 
share your animations online using the above URL.
On opening Scratch, you see the interface as shown in 
Fig. 8.3. Each object on the scratch window is called a 
sprite. This object can be any person, an animal, an 
automobile, a building or even text.
After learning about the Scratch interface let us now 
verify the steps that would take out Twirly cat home. In 
Fig. 8.3: Scratch Interface
Chapter 8.indd   105 7/22/2020   12:36:48 PM
2024-25
ICT Tex Tbook — Class Ix 106
the Scratch window, our Twirly cat will be called a cat 
sprite. To make the sprite move on a specific path, you 
have to choose the appropriate instruction block and 
drag it to the script area. Make sure you choose the 
instructions in a logical sequence. When the script is 
complete, you need to execute it to see the output on 
the stage (Refer Fig. 8.4).
Chapter 8.indd   106 7/22/2020   12:36:50 PM
2024-25