Answer: D) Analytical Engine Explanation: Computer was invented by Charles Babbage. The First Mechanical Computer Designed by Charles Babbage, a British mathematician was called as Analytical Engine which resembles today's modern machines  between 1833 and 1871.

Answer: A) Memory Explanation: In a computer, the area where the data is stored for the quick access by the computer's processor is called Main storage or Primary storage or Memory or RAM.   Hence, main storage is also called Memory.

Answer: C) Basic Input Output System Explanation: BIOS in computers stands for Basic Input Output System.   BIOS is a set of computer instructions in firmware which control input and output operations.

Answer: B) Central Processing Unit Explanation: In a computer, memory is one part of Central processing unit i.e, CPU.

Answer: C) Ctrl + Z Explanation: For undo the action or last action [Ctrl + Z] is used.

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,...