CBSE Class 9 Computer Science Worksheet Set 03

CBSE Class 9 Computer Science Worksheet (3)

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I. Fill in the blanks.

1.) Computer is an electronic device.

2.) DVD works in the same way as CD – ROM but packs more data than bits in the same work area.

3.) 0 and 1 are binary digits.

4.) Any data fed by the users through a keyboard is called input.

5.) Whenever data is fed by the user, it is processed by CPU (Central Processing Unit) for the output.

6.) Data fed is translated into Machine language/ Binary codes for processing.

7.) Joystick is an input device mainly used for games.

8.) A scanner is an input device.

9.) The CPU is a combination of a CU and ALU.

10.) A Printer is an output device, which produces hard copies as an output.

11.) Laptop is a portable computer.

12.) Example of secondary memory is CD-ROM

13.) OCR reads approximately 750 documents per minute.

14.) RAM is a volatile memory by nature.

15.) Mathematic calculation is done in computer by its ALU.

16.) Internal storage is known as primary memory.

17.) Software is a set of instructions that directs the hardware.

18.) A computer system is classified as hardware and software.

19.) Software can be categorized as system and application software.

20.) A virus program is also software.

21.) An operating system is an interface between user and computer.

22.) Shareware is the software developed for public domain and hence can be copied without infringing copyright.

23.) Free software is the software that is freely accessible and can be used, modified, improved, copied and distributed free of charge.

24.) Proprietary software has restrictions on copying, modifying and using the software.

25.) DOS is a single user operating system.

26.) Compiler is a software that translates the entire program into machine code in one go.

27.) Interpreter is software that translates the program into machine code line by line.

28.) Assembler is a language translator which translates the assembly language into machine code.

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