9th Science Guide Unit 25 Computer – An Introduction

9th Std Science Lesson 25 Computer – An Introduction – English Medium

9th Science Book Back Answers Unit 25. 9th Science Lesson 25 Computer – An Introduction Book Back Answers. 9th Standard Science Samacheer kalvi Guide Book Back Answers download PDF Tamil Medium and English Medium book in answers. 9th All Subject Guide. Class 9 Science Questions and Answers. Class 1 to 12 All Subject Guide.  

9th Science Guide Unit 25 Computer – An Introduction

I. Choose the correct answer

1. ____________ is an electronic device which stores data and information.

1. Telescope
2. Television
3. Computer
4. Radio

Ans ; Computer

2. _________ belongs to the generation IV of the computer

1. Microprocessor
2. Artificial intelligence
3. Transistor
4. Vaccum Tubes

Ans ; Microprocessor

3. Data processing involves________ steps.

1. seven
2. four
3. six
4. eight

Ans ; six

4. 1. Abacus belongs to the first generation of the computer.

2. ENIAC was used in the American military.

1. Both the statements are correct
2. Statement 1 is wrong but 2 is correct
3. Statement 1 is correct but 2 is wrong
4. Both the statements are wrong.

Ans ; Statement 1 is wrong but 2 is correct

IV. Match the following

1. III generation computer – integrated circuit
2. Text, number – information
3. Transistor – Father of computer
4. Directly used – Data
5. Charles Babbage – II generation

Ans : 1 – A, 2 – D, 3 – E, 4 – B, 5 – C

III. Short Answer Questions :

1. Define computer.

Computer is an electronic device which manipulates and stores data and information through commands or program codes.

2. Differentiate data and information.

3. What is data processing?

The data processing in a computer is collecting data and converting it into information according to our needs and requirements.

IV. Answer the following in detail

1. What are the different steps involved in data processing?

• Data collection
• Data storage
• data sorting
• the data processing
• Data analysis
• Data presentation and conclusions

2. List out the generations of computer.