Short Answer Type Questions: Computer System | Computer Applications for Class 9 PDF Download

Q.1. What is a Computer System?

Computer systems refers to a computer along with any software and peripheral devices that are necessary to make the computer perform a particular task.

Q.2. What is Flash Memory used for?

Flash memory is a non-volatile memory chip used for storage and for transfering data between a personal computer (PC) and digital devices. It has the ability to be electronically reprogrammed and erased. It is often found in USB flash drives, MP3 players, digital cameras and solid-state drives.

Q.3. What is the function of an ALU?

The Arithmetic Unit is responsible for performing arithmetic operations like addition, subtraction, multiplication and division. The Logical Unit is used to perform logic operations such as comparing, selecting, matching and merging of data.

Q.4. Name the type of memory that is placed is logically positioned between the Registers and Main Memory.

Cache Memory

Q.5. State two differences between a RAM and a ROM.

Differences between a RAM and a ROM.

Q.6. State two disadvantages of using a Thermal Printer.

Disadvantages of Thermal Printers:

• Too much of heating is a possibility and may damage the printer.
• It is not suitable to print in colour.

Q.7. What are the different types of memories that form the Memory Unit of the Computer System?

RAM, ROM, Registers, Cache, Hard Disk, Memory Card, Pen drive, optical disk, etc.

Q.8.  What is the difference between CD and DVD?

DVDs offer more data storage capacity compared to CDs. CDs are also commonly used for audio and program files, while DVDs are used for video and program files.

Q.9. What is an Input Device? Name two Input Devices.

Input Devices are peripherals that are used to provide data to the computer system. Example- Keyboard, Mouse, Scanner, etc.

Q.10.  What is the function of an ALU?

The Arithmetic Unit is responsible for performing arithmetic operations like addition, subtraction, multiplication and division. The Logical Unit is used to perform logic operations such as comparing, selecting, matching and merging of data.

Q.11. What is 'block' in a hard disk?

A block is a sector or a group of sectors that the operating system can address (point to).

Q.12. How does a Drum Scanner work?

Drum scanners spins the image at high speed while it is scanned pixel by pixel, creating the highest possible quality scanned image. Here the original document to be scanned is wrapped around a drum and then scanned by moving the detector head longitudinally as the drum is rotated.

Q.13. State two advantages of using a Dot Matrix Printer.

Advantages:

• It can print on multi-part stationery or make carbon-copies.
• Among all the printers it has the lowest printing costs per page.

Q.14. What is a Laser Printer? How is it different from an Inkjet Printer?

A Laser printer is a type of printer that is linked to a computer producing good-quality printed material by using a laser to form a pattern of electrostatically charged dots on a light-sensitive drum, which attract toner (or dry ink powder). The toner is transferred to a piece of paper and fixed by a heating process.
Inkjet printer uses ink cartridges whereas laser printer uses toner cartridges.

Q.15. Define the terms "Block" and "Sector" as used in a Hard Disk.

A sector is one of the "pie slices" the diskette or disk is divided into. Dividing the circular medium into pie slices is a way to organize it so that data can be located by the read/write heads of the drive. The hard disk is usually installed inside the computer's case, though there are removable and cartridge types as well. A block is a sector or a group of sectors that the operating system can address (point to). The bigger the hard disk size more the sectors that a block will hold. It is the block where actual data is stored.

Q.16. How are the terms Data and Information related?

Data are simply facts or figures — bits of information, but not information itself. When data are processed, interpreted, organized, structured or presented so as to make them meaningful or useful, they are called information.