Answer: C) WINDOWS Explanation: Microsoft Excel is a spreadsheet developed by Microsoft for Windows, macOS, Android and iOS. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications.

Answer: A) CPU Explanation: Central Processing Unit (CPU) is the brain of any computer system.

Answer: A) RAM Explanation: Volatile memory is computer memory that requires power to maintain the stored information. It is a temporary memeory which cannot contain information permanently. Example :: RAM or Random Access Memory

Answer: C) Both A & B Explanation: Secondary storage therefore needed because it is non-volatile, meaning it retains its contents without the need for a power supply. It also has the large storage capacity needed to store the operating system and all the programs and files needed by a modern computer system.

Answer: D) All of the above Explanation: Magnetic disk is a kind of data storage device. Storage capacity of magnetic disk depends on  1. tracks per inch of surface 2. bits per inch of tracks 3. disk pack in disk surface   It can be shown as ::

Answer: A) DRAM Explanation: Memory refresh is the process of periodically reading information from an area of computer memory and immediately rewriting the read information to the same area without modification, for the purpose of preserving the information. Memory refresh is a background maintenance process required during the operation of semiconductor dynamic random-access memory (DRAM), the most widely used type of computer memory.

Answer: D) All of the above Explanation: A computer has two types of memory. 1. Non-volatile and 2. Volatile.   Volatile memory is computer memory that requires power to maintain the stored information. * It is a temporary memeory which cannot contain information permanently. Example :: RAM or Random Access Memory   Non-volatile memory is computer memory that can retain the stored information even when not powered. * It is a permanent memory in which data is stored in permanently. Examples :: Hard disc, ROM, Floppy discs, Magnetic tape,...

Answer: A) DPI Explanation: Dots per inch (DPI, or dpi) is a measure of spatial printing or video or image scanner dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch (2.54 cm).