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Summary
Memory is a part of computer where data and instructions are stored. A computer deals with different type of memories. Two major types of computer memories are (i) primary (main) memory and (ii) secondary (auxiliary) memory.
Information in a memory of a digital computer is stored in form of binary digits (0 and 1).A group of 8 bits is known as byte.
Primary Memory :- Primary memory, also known as main memory It is made of larger number of cells. Each cell is identified by a number called an address of the cell. This is known as Random Access Memory (RAM)
FIFO Stand for :- First in First Out
LIFO Stand for :- Last in First Out
RAM is volatile memory. There are two basic types of the RAM. The first one is static and second is dynamic. Dynamic RAM (DRAM) needs to be refreshed thousands of times per second. Static RAM (SRAM) docs not need to the refreshed.
Computers also contain Read Only Memory (ROM) which are used to permanently record data and instructions.
A variation of a ROM is a Programmable Read Only Memory (PROM)
There is a special type of PROM called Erasable PROM (EPROM). Erasable PROM (EEPROM). EEPROMS are very useful in manufacturing
Secondary Memory Primary memory is generally costly and has capacity limitation. The popular secondary storage devices are hard disk, compact disks (CDs), digital versatile disks (DVDs), and pen drives. Secondary memory is not directly accessible to processor of a computer but requires use of computer’s input/output channels.
Binary Number System The binary number system has two symbols 0 and 1. Single binary digit is called a bit
Choose the most appropriate option from those given below :
1.What is an alternative name of a primary memory?
(a) Volatile
(b) Permanent
(c) Auxiliary
(d) Any of these
2. For what amount of time does a secondary memory retain its content ?
(a) Short duration
(b) Long time
(c) Never
(d) Any of these
3.Which of the following is the unit of computer memory?
(a) Bit
(b) Pit
(c) Chit
(d) Kit
4.How many bits form a byte ?
(a) 4
(b) 8
(c) 16
(d) 32
5.Which of the following is a correct example of a LIFO ?
(a) A queue of people
(b) Cars waiting for service
(c) Pile (tray) of paper
(d) Jobs waiting for services
6.Which of the following mechanism is used to erase content of An EPROM ?
(a) ultraviolet light
(b) electric signal
(c) laser technology
(d) magnetic field
7. Which of the following type of memory is used by pen drives?
(a) RAM
(b) PROM
(c) EEPROM
(d) Any of these
8. Which of the following is a small and high speed memory within the computer central processing unit ?
(a) Secondary
(b) Auxiliary
(c) Cache
(d) ROM
9.Which of the following is not a secondary storage device ?
(a) Cache memory
(b) Compact disks
(c) DVDs
(d) Pen drives
10. Which of the following number system is most suitable for basic computer data
representation into machine readable form ?
(a) Binary
(b) Octal
(c) Ternary
(d) Hexadecimal
11. Which of the following number systems has 2 symbols 0 and 1 ?
(a) Decimal
(b) Binary
(c) Hexadecimal
(d) Octal
12. Which of the following method is used to represent an integer number into computer
memory?
(a) Sign magnitude method
(b) l’s complement method
(c) 2’s complement method
(d) All of these
13.Which of the following method is used to represent characters into computer memory?
(a) ASCII
(b) Unicode
(C) EBCDIC
(d) All of these