11. What is a modem? What are its types?
12. What is the difference between primary memory and secondary memory?
13. What are SSD, CD-ROM, and DVD? Explain.
14. What is the difference between hardware and software?
15. What is the difference between impact and non-impact printers?
16. What is a spreadsheet?
17. What are rows, columns, and cells in a spreadsheet?
Answer (2)
A modem is a device that connects computers to the internet, with types including dial-up, DSL, cable, and fiber optic. Primary memory (RAM) is temporary storage for active data, while secondary memory (like SSDs and hard drives) is long-term storage. Hardware refers to the physical machinery of a computer, whereas software is the coding that instructs the hardware.
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What is a modem? What are its types? A modem (short for modulator-demodulator) is a hardware device that converts data so that it can be transmitted over communication lines such as telephone or cable systems. It allows computers to connect to the internet or communicate with other computers. Types of modems include:
Dial-Up Modems : These use telephone lines to connect to the internet.
DSL Modems : These use digital subscriber lines for faster internet connections than dial-up.
Cable Modems : These use coaxial cables, like those for cable TV, to provide high-speed internet access.
Fiber Optic Modems : These use fibers made of glass or plastic and provide very high-speed internet connections.
Wireless Modems : These connect to the internet via wireless signals, often used in mobile devices.
What is the difference between primary memory and secondary memory? Primary memory, also known as volatile memory, refers to the computer's RAM (Random Access Memory) where the system stores data that is in active use for quick retrieval and processing. It loses its contents when the power is off. Secondary memory, or non-volatile memory, refers to storage devices like hard drives and SSDs where data is stored permanently or semi-permanently and is not lost when the power is turned off.
What are SSD, CD-ROM, and DVD? Explain.
SSD (Solid State Drive): A type of storage device that uses integrated circuits to store data, providing faster access speeds than traditional hard drives.
CD-ROM (Compact Disc Read-Only Memory): A type of optical disc that can store data, and the data is read using a laser. It is mostly used for music, software, and games.
DVD (Digital Versatile Disc): A similar optical disc like CD-ROM, but with a higher storage capacity, commonly used for video playback and data storage.
What is the difference between hardware and software? Hardware refers to the physical components of a computer system, like the CPU, monitor, keyboard, and mouse. Software refers to the programs and applications that run on a computer, including operating systems and applications like word processors.
What is the difference between impact and non-impact printers? Impact printers work by physically striking an ink ribbon against paper, like typewriters. Non-impact printers, like inkjet and laser printers, don't touch the paper; instead, they use sprays of ink or laser technology to transfer text and images.
What is a spreadsheet? A spreadsheet is a digital document, typically presented in the form of a grid of rows and columns, that allows users to input, edit, calculate, and analyze data—often used for financial analysis, budgeting, and data organization.
What are rows, columns, and cells in a spreadsheet?
Rows: They run horizontally and are usually labeled with numbers (1, 2, 3, etc.).
Columns: They run vertically and are usually labeled with letters (A, B, C, etc.).
Cells: The intersection of a row and a column, each cell is identified by a combination of the column letter and row number (e.g., A1, B2). Each cell can contain data such as text, numbers, or formulas.
