Study Notes

 Chapter 2 Input Output and Memory devices (Important  repeated questions from previous year question papers) 1. Define Cache Memory?(Model Question paper) The cache is a small amount of high speed memory present between primary memory and CPU.It holds the most recent data and instructions There are two levels of cache memory, L1 and L2. L1 is present inside the CPU and L2 on mother board 2.Different types of ROM?(Board Exam 2018) PROM (Programmable read-only memory)  – It can be programmed by user. Once programmed, the data and instructions in it cannot be changed. EPROM (Erasable Programmable read only memory)  – It can be reprogrammed. To erase data from it, expose it to ultra violet light. To reprogram it, erase all the previous data. EEPROM (Electrically erasable programmable read only memory)  – The data can be erased by applying electric field, no need of ultra violet light. We can erase only portions of the chip. 2. Compare RAM and ROM.  RAM stands ...

 Unit 1 Overview of a computer 1.What is a computer ? or   Give meaning or definition of computers(Board question 2014) A computer is an automatic  electronic machine that can store,recall and process data and gives output according to the instruction given by the user. 2.Which is the earliest computing machine? The earliest computing machine is ABACUS. 3.Name the functional components of a computer? The functional components of a computer are input unit, output unit, central processing unit and memory or storage unit. What is the use of input unit The input unit is used to feed data and instructions to the computer through input devices Give any two input devices?(Board question 2015) Key board, Mouse 4.Who invented the Pascaline ? (Board question 2018) Blaise Pascal invented Pascaline . 5.What are the advantages of the machine by Leibniz over Pascaline? Leibniz calculator could perform multiplication and division   It was also faster compared to Pasc...