PSEB Class 7 Computer Science Chapter 8 Storage Devices Solution

PSEB Punjab Board Class 7 Computer Science Textbook Solution Chapter 8 Storage Devices Exercise Questions and Answers

 

Lesson No 8 – Storage Devices

Exercise

Q1) Fill in the blanks :-

1) Primary memory is also called ……………………………..

a) Internal memory

b) External memory

c) Physical memory

d) Auxiliary memory

Ans – a) Internal memory 

 

2) ………………………… is not a Read Only Memory.

a) ROM

b) PROM

c) EPROM

d) RAM

Ans- d) RAM

 

3) …………………… is not a portable storage device.

a) External Hard Disk

b) Pen drive

c) Hard Disk Drive

d) Memory Card

Ans- c) Hard Disk Drive 

 

4) The memory is divided into number of small of small parts called ………………………

a) Cells

b) Area

c) Inter-section

d) None of these

Ans-

 

5) USB means …………………………………….

a) Uniform Service Book

b) Universal Serial Bus

c) Universal Straight Bus

d) Uniform Serial Bus

Ans- b) Universal Serial Bus

 

Q2) Very Short Answer Type Questions :-

1) What is the capacity of Floppy disk?

Ans :- The capacity of a Floppy disk to hold the data is 1.44 MB.

 

2) What is the capacity of Compact Disk (CD)?

Ans :- 650 – 700 MB is the data storage capacity of a Compact Disk (CD)

 

3) Which memory unit is usually used to measure the storage capacity of hard disk.

Ans :- The storage capacity of the hard disk is measured in the GB’s (Giga Bytes) and TB’s (Terra bytes).

 

4) Which is having greater storage capacity out of CD or DVD.

Ans :- As DVD is compared to the CD, DVD has large storage capacity more than a CD.The storage capacity of a CD is measured in MB’s whereas DVD is measured in GB’s.

 

5) Which computer port is used to attach its Pen Drive.

Ans :- We attach the Pen Drive to the USB (Universal Serial Bus) port of the computer.

 

Q3) Short Answer Type Questions :-

1) What is memory? Write down two main categories of memories?

Ans :- Computer memory is a part or storage place where the data or instructions which
are feeded into computer are being stored. There are different types of computer
memories but mainly two memories are used viz are i) Primary memory and ii) Secondary memory.

 

2) Write the name of four Secondary Memory devices?
Ans :- Hard Disk Drive, Floppy Disk, Compact Disk (CD), Digital Versatile Disk (DVD) are some examples of the Secondary Memory devices.

 

3) What is Memory Card?

Ans-

Memory cards are the portable storage media which is available in different sizes and is used for storing data in the form of videos, images, pictures, music, other forms of data etc. Memory cards are always used in digital cameras, mobile phones, game consoles, mp3 players etc. Memory card readers and data cables are used to read the data stored on the memory cards.

 

4) Write a short note on pen drive

Ans :- Pen drive is a USB (Universal Serial Bus) a flash memory device that is used for storing and transferring the data and information into the form of audio, video, data files from the computer. Pen Drives are very small in size so that they can easily fit into the pocket and can be carried anywhere. Flash drive, jump drive, thumb drives are the other names of the pen drives. Pen drives performs the work that CD or Floppy Disks do i.e is of storing of data, keeping of back-ups, and transferring of data files from one computer to the other. As compared to the CD or Floppy Disks, this storage media is very small in size, and has very fast speed for transferring of data fie on the computer because it has no movable parts.

 

5) Write about CD.

Ans :- CD stands for Compact Disk. It is a portable storage media i.e means it can be moved/ carried from one place to another. We can store the large data like music, videos, text etc into the CD upto the range 650 – 700 MB. Once the information/data that is written on the CD cannot be edited or rewritten, as it is a type of digital information. There are availability of different drives for reading the information on the CD. In the todays world, softwares are mostly distributed to the users in the CD. If you will see the CD, you will notice that one side of it is shining, similar to the mirror. Micro pits and plats are used for storing information and data into CD. The shiny part of the CD contains Micro pits and plats. We cannot see this pits with our naked eye and there is a need of laser beam to read the information or data stored on the CD.

There are two types of CD’s which are as followed :-

a) CD – R :- These are the types of CD’s on which the data or information can be written
only once i.e means the data or information once written cannot be erased or edited
afterwards. The information or data stored on this type of CD is only readable. Hence
it is called as Compact Disk Readable/Read Only (CD – R)

b) CD – RW :- This type of CD is just the opposite of CD – R, which means you can
change and read the data or information that is stored on this media as many times
you want. Such type of CD’s are also called as CD – RW (Compact Disk Readable and
Writable? Rewrittable).

 

Q4) Long Answer Type Questions :-

1) Write a note on Primary Memory?

Ans :- Primary memory is the main memory. The data stored on such type of memory remains till there is continuous of power supply and can be erased as soon as the power is been cut off. In other terms, the input from different devices goes first to the main memory and will be remained into the memory electronically. The data/ content remains in the main memory until the computer is been switched off. Such type of memory is Volatile (Temporary) in nature. RAM (Random Access Memory) and ROM (Read Only Memory) are examples of such type of memory.

2) What is HDD? Explain?

Ans :- Hard disk is a non-volatile storage device that is present inside the computer
system and its called as online storage device whereas it’s data storing capacity is huge (known as mass storage device).

A compared to the Primary memory or main memory, Hard disk is comparatively very slow in working. There are many popular hard disks which people use nowadays are of 160 GB, 500 GB, 1TB storage capacities.

Hard disk stores plenty of information permanently like OS, Compiler,
Assembler, Database, Application programs etc. Hard disk is made up of double/pack
aluminium or some other metal platters, which are iron oxide coated. On the platters,
both side there is tracks and sectors where the data is been/gets stored. These platters
are arranged in a spindled each platter that consists of read/writes head. This
read/write are arranged with a thing/arm seems like a comb which is known as access
arm. When the disk rotates, the read/write head goes to the head. In this manner
read/write is in straight position. The data where it gets located/stored has an address,
by which its much easier for the access arm in finding the data. Read/write head in a
hard disk are arranged so tightly in a box that they don’t catch dust. This box looks like
a lunch box known as chamber.

 

3) What is Secondary Memory? Explain any one secondary memory device?

Ans :- Secondary memory is also known as Auxiliary memory. The data and instructions
stored on the secondary memory is stored for a longer period/permanently. As compared to primary memory the secondary memory is much cheaper and slower. The data and instructions stored on secondary memory is not directly accessed by the processor but it requires I/O channels. Secondary memory has higher storage capacity. The data/instructions stored on the secondary memory remains unchanged, even if the power is turned off. Hence it is Non-volatile memory. The examples of secondary storage devices are:- Hard disk, CD(Compact Disk), DVD(Digital Versatile Disk), pen drives.

 

a) Floppy disk :-

A floppy disk is a flexible and portable disk. It has magnetic coating on it which can store 1.44 MB of data. It was one of the oldest type of storage and nowadays its not used due to its less storage space/capacity. Floppy disk is rewritable which means we can reuse it again and again. You may also notice that the size of the Floppy Disk is 3.5”. This are the transferrable media means the data that is stored in the Floppy Disk can be easily transferred to the other computers. If we do not take proper care of this storage device, it gets damaged easily.

 

4) What precautions that we must follow while using a CD/DVD.

Ans :- While making use of CD/DVD, following are the precautions that we must take care of :-

a) Keep the CD/DVD covered when it is not in use.

b) Try to avoid in touching the shining surface of a CD/DVD.

c) Don’t write anything on the back of the CD/DVD, with pen or pencil.

d) Never try to bend the CD/DVD

e) Make of soft cloth to clean the CD/DVD or you may make use of the water to clean the dirt from the CD/DVD.

 

5) What is External Hard Disk drive? Write its advantages.

Ans :- It is used for storing the data into the computer and is portable and can be connected to computer with the help of USB or wirelessly. For the storing of operating system, programs and the user’s information, there is a requirement of at least on hard disk in the computer system. You might have observed that there were some computers which contained the hard disk internally attached or built in. But due to the reason of rise in the computer threats, the use of external hard disk drives became much popular. As compared to the built in/internal hard drives, the external hard drives had the much more capacity of storing the data. It allows the users in storing the very important and confidential information, disconnecting the drive and then storing the information at very safe place. The external HDD has the high/more storage capacities and are used for backing up computers or serving as a network drive.

The advantages of the external hard disk drive are as followed :-

a) This a portable storage device and works on the policy of plug and play.

b) The user can separately keep the back up of information/data different from the internal hard disk.

c) If we make use of the internet, then there is a possibility of the threats to data like corrupt or damage of very important files, documents, large music, movies, videos images files etc and other backup data files too. But with the help of external had disk drive we can keep our data files securely and safely.

 

See below for others chapters solution ⇓

 

Dear Student, I appreciate your efforts and hard work that you all had put in. Thank you for being concerned with us and I wish you for your continued success.

Updated: July 12, 2022 — 2:07 pm

Leave a Reply

Your email address will not be published. Required fields are marked *