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DAV Class 5 Computer Chapter 1

 CLASS :V CHAPTER :1 SUBJECT: COMPUTER

A. Answer these following Questions.

a) What do you mean by computer memory ?


Ans : computer memory is any physical device capable of storing information temporarily or permanently.

b) What are the types of   computer   memory ?


Ans: computer memory is of two basic types . primary memory (RAM and ROM ) and   secondary memory (Hard drive, CD .etc.)

c) Which memory is also known as long term memory of computer ? Ans: ROM (read only memory)

d) What are the different data storage units ?


Ans: Data storage unis are bit ,byte, kilobyte, megabyte, gigabyte, terabyte, petabyte …….

e) How many bytes are in a kilobyte.


Ans: 1024 bytes


f) What are secondary storage devices ? Give some examples.


Ans: secondary storage devices are devices that operate alongside the computer’s primary storage and can store large amount of data from a few megabytes to petabytes. Examples are hard drive, cd, dvd, pendrive …..etc.

g) Write differences between primary memory and secondary memory.


Primary memory Secondary memory

Fast Slow

Expensive Cheap

Low capacity Large capacity

Works directly with processor Not connected directly to processor

h) Write differences between   RAM and ROM.


RAM ROM

Random access memory Read only   memory

Data can be read or

written Data can only be read

Short term memory Long term memory

Volatile in nature Non volatile in nature

 

i) Which storage device has the largest memory storage capacity from optical media group?

Ans: Blu-Ray Disc (BD,BRD)


j) What is CPU? Write its functions and parts.


Ans; CPU stands for central processing unit . it is called brain of computer and responsible for processing the data and saving it on computers memory. It has three parts. CU, ALU & MU.

B. Fill in the blanks.


a) CPU is the brain of computer.

b) ALU stands for ARITHMETICA AND LOGICAL UNIT .

c) RAM and ROM are Primary memory of computer.

d) PEN DRIVE, CD, DVD is a portable secondary storage device.

e) RAM is VOLTILE in nature.

f) BIT is the smallest unit of memory.

C. True or False:-


a) KB stands for kilobit. False

b) Hard disk is a primary memory of computer. False

c) In ROM we can Write and Read. False

d) The storage capacity of CD is 750 Mb. True

e) 1 Kb = 1020 bytes. True


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