**Class 9 Computer Science Chapter 1 Basics of Computer System Question Answer, SEBA Class 9 Computer Science Solutions, NCERT Class 9 Computer Science Chapter 1 Basics of Computer System** to each chapter is provided in the list so that you can easily browse throughout different chapters

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**Class 9 Computer Science Chapter 1 Basics of Computer System****Class 9 Computer Science Chapter 1 Basics of Computer System**

**Class 9 Computer Science Chapter 1 Basics of Computer System**Also, you can read the SCERT book online in these sections Solutions by Expert Teachers as per SCERT (CBSE) Book guidelines. **NCERT Solution of Class 9 Computer Science Chapter 1 Basics of Computer System** is part of AHSEC All Subject Solutions. Here we have given **Class 9 Computer Science Chapter 1 Basics of Computer System **Notes for All Subjects, You can practice these here in Class 9 Computer Science.

**ADDITIONAL QUESTIONS AND ANSWERS**

**1. Name any manual calculating device.**

Ans: Abacus.

**2. Who is known as the ‘father of modern computer’? **

Ans: Charles Babbage is called the father of the modern computer.

**3. Name the first computer that implemented the idea of John von Neumann.**

Ans : EDSAC (Electronic Delay Storage Automatic Calculator).

**4. Who invented the tabulating machine?**

Ans: Herman Hollerith.

**5. Give the full from of the following.**

**(i) ENIAC **

**(ii) EDSAC**

Ans: (i) Electronic Numerical Integrator and computer.

(ii) Electronic Delay Storage Automatic Calculator.

**6. IBM’s OC and Apple’s Macintosh are examples of which generation of computers?**

Ans: 4th generation.

**7. Name the machines designed by Charles Babbage.**

Ans: English mathematician Charles Babbage, proposed a machine called the difference engine to compile mathematical table.

**8. What is a computer software?**

Ans : Computer software is a collection of programs, procedure and related data that provide the instructions for telling a computer what to do and how to do it.

**9. What do you mean by system software?**

Ans: System software refers to the programs that controls internal Computer operations and hardware makes best use of the hardware devices.

**10. What do you mean by an operating system?**

Ans: Operating system is a program that acts as an interface between the user and the hardware.

**11. Operating system is an example of which type of software? **

Ans: System software.

**12. Name the three types of computer memory.**

Ans: Primary memory, Secondary memory (Auxiliary storage) and Cache memory.

**13. Name the computer program designed to help the user perform a certain type of work.**

Ans: Specific-Purpose Application software.

**14. In order to use the printer, an operating system will need a special type of software. This software is known as what?**

Ans: In order to use the printer, an operating system will need a device driver software.

**15. Which language processor converts an HLL program into machine language at once?**

Ans: Compiler is a language processor which converts whole HLL program into machine language at once which can be understood by the processor.

**16. Define a utility software.**

Ans: A utility software is a system software designed to help in the management and tuning of operating systems, computer hardware’s and different application softwares.

**17. Mention some examples of utility software.**

Ans: Data compression utilities, virus protection utilities and disk defragmentation utilities.

**18. Describe application software.**

Ans: An application software is designed to help the user to perform specific functions.

**19. What do you mean by machine language?**

Ans: Machine language is the only language that is understood by the computers. It is a collection of binary digits (0 or 1) or bits that the computer reads and interprets.

**20. Which is more beneficial a compiler or an interpreter and Way?**

Ans: Compiler is more beneficial than an interpreter for translating a high level, language program into machine language program because compilation process of a compiler is nearly 5 to 25 times faster than interpreter.

**21. Give the technology used in the following generation of computers: **

**(1) First ________**

**(2) Second _______**

**(3) Third _______**

**(4) Fourth _______**

**(5) Fifth _______**

Ans: (1) Vacuum Tubes.

(2) Transistors.

(3) Integrated Circuits (IC).

(4) Microprocessors.

(5) Artificial intelligence (AI).

**22. What is contribution of John Von Neumann in the field of computer?**

Ans: The EDSAC was the first computer to be built on the stored program architecture for computer proposed by the scientist and mathematician John Von Neumann. This design architecture for a computer, originally proposed for the EDVAC but implemented first in the EDSAC, a also call the Von Neumann architecture.

**23. Who devised Hardware Mark-I ? What was it used for?**

Ans : The IBM Automatic Sequence Controlled Calculator (ASC), called Mark-I by Harvard University’s staff, was a general purpose electromechanical computer that was used in the war effort during the last part of World War II. One of the first programs to run on the Mark-I was initiated on 29 March 1944 by John Von Neumann.

**24. What does a bit stands for? **

Ans: A bit is a binary digit, the smallest increment of data on a computer. A bit can hold only one of two values: 0 or 1, corresponding to the electrical values of or on, respectively.

**25. How many digits are there in a Binary number system?**

Ans: There are two digits i.e.0 and 1 in the binary number system.

**26. Which digits are used in Hexadecimal number system?**

Ans: The digits (to be specific it is a combination of digits and alphabets) used in the Hexadecimal number system are 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E and F. In this A represents 10, B represents 11, represents 12, D represents 13, represents 14, and F represents 15.

**27. What is decimal number system? **

Ans: Decimal is a term that describes the base – 10 number system, probably the most commonly used number system. The decimal number system consists of ten single-digit numbers: 0,1,2,3,4,5,6,7,8, and 9.

**28. Define binary number system.**

Ans: A number system where a number is represented by using only two digits (0 and 1) with a base 2 is called a binary number system.

**29. State the use of number system.**

Ans: Number System is used to count things. There are number of different numbering system which is in use for the unique ability to represent different numbers. Binary, Octal, Decimal and Hexadecimal are number systems that are used in different aspects Decimal number is the most commonly used number system which is frequently used in daily life.

**30. Explain octal and hexadecimal number.**

Ans: **Octal number system:** The number system has eight unique symbols: 0,1,2,3,4,5,6,7. Thus, octal number system is base-8 number system.

The octal number system is also a positional value system. Each octal digit of an octal number has its own value or weight expressed as a power of 8.

**Hexadecimal number system: **The hexadecimal number system is the base-16 number system. This number system uses 16 possible digits or symbols. It uses the digits 0 to 9,10,11,12,13,14, and 15 respectively.

In the hexadecimal number system, therefore, the letters, A through F are number digits. The number A has a decimal equivalent value of 10 and the number F has a decimal equivalent value of 15.

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