Kips Cyber Beans Class 9 Chapter 1 Solutions COMPUTER SYSTEM

TextbookKips Cyber Beans Class 9
UnitUnit-1 Basics of Information Technology
Chapter1 Computer System
Other Chapters SolutionsKips Cyber Beans Class 9 Solutions

Brain Developer

Contents

Section 1: Objective Type Questions

A. Multiple Choice Questions:

1. Which of the following is not a characteristic of a computer?

  • Reduces paper work
  • Less storage capacity
  • Accuracy
  • Speed

2. The final output available to a user on the monitor is known as Softcopy.

  • Hardcopy
  • Software
  • Softcopy
  • Bytes

3. Which of the following is not a part of a CPU?

  • MU
  • ALU
  • VDU
  • CU

4. The component which is responsible for the control of all mathematical calculations and logical operations of a computer is called

  • ALU
  • CU
  • MU
  • ROM

5. The process of converting unorganized data into meaningful information according to user’s instructions is called

  • Input
  • Storage
  • Output
  • Processing

6. Unorganized raw facts and figures given to a computer are collectively called

  • ROM
  • Information
  • Output
  • Data

7. The basic organization of a computer does not consist of

  • Keyboard
  • Input unit
  • Output unit
  • CPU

8. ROM stores a set of instructions called

  • DRAM
  • PROM
  • BIOS
  • SRAM

9. The type of ROM which can have its contents erased by ultraviolet light is called

  • PROM
  • EPROM
  • EEPROM
  • Flash memory

10. A commonly used storage device is

  • RAM
  • ROM
  • Hard disk
  • SRAM

11. The smallest unit of memory is

  • Byte
  • Bit
  • Nibble
  • Kilobyte

12. The special high speed memory which stores frequently used instructions so that a CPU can access them quickly is called

  • DRAM
  • Cache
  • PROM
  • Flash Memory

13. The memory which is programmed at the time of manufacturing and cannot be modified later is called

  • EPROM
  • PROM
  • ROM
  • RAM

14. In which form is the data represented in Digital computers?

  • Analog form
  • Decimal form
  • Binary form
  • Octal form

15. Which of the following category is not included in Microcomputers

  • Tablet PC
  • Laptop computer
  • Supercomputer
  • Handheld devices

16. A computer is not able to

  • Think
  • Reduce usage of paper
  • Reduce manpower
  • Increase efficiency

17. The speed of a CPU is measured in

  • MB
  • CB
  • TB
  • Mhz

18. is a quick and convenient way to send short messages.

  • MMS
  • SMS
  • E-Mail
  • None of these

B. Fill in the blanks. Select the best option(s) from the keywords given in the bracket:

1. Read only memory is a part of Internal Memory.

2. CU as a component of CPU that controls the transfer of data and instructions among other units of computer.

3. Computers have Zero IQ.

4. A microprocessor is a Chip where large number of circuit elements are integrated.

5. The speed of CPUs determined by the number of Instructions executed by it per second

6. The speed of external memory is much Slower than internal memory.

7. The three components of a CPU are MU, CU and ALU.

8. Primary memory is of two types RAM and ROM.

9. The primary use of ROM is during the Booting process, which contains initial program to start a computer.

10. A computer compiles results using Processing unit.

11. Cache memory is a special high speed memory, which stores frequently used instructions.

C. State True or False:

1. Primary memory is used to store large amount of information permanently. – FALSE

2. MMS can be used for sending pictures and videos through mobile phones. – TRUE

3. The functions of a computer are – InputProcessStorage, and Output. – TRUE

4. The Control Unit stores data and instructions in memory storage devices. – FALSE

5. A processor is a system board and is the most important hardware component of a computer. – TRUE

6. Data required for processing is transferred from a secondary memory to a primary memory. – TRUE

7. 1 Giga Byte is equal to 1024 Tera Byte. – FALSE

8. RAM and ROM are also called Immediate Access Storage. – TRUE

9. Flash Memory is a specific type of EEPROM that can be erased and reprogrammed into big sections instead of one byte at a time. – TRUE

10. Nibble is a group of 8 bits. – FALSE

Section 2: THEORY QUESTIONS

What is a computer?

A computer is a programmable electronic device that accepts input, processes the data according to a set of instructions and gives some meaningful output.

Write any two characteristics and limitations of a computer

• Characteristics:
1. Speed: A computer works at an amazing speedThe work which is done by a normal person in 2-3 hours can be done by a computer in a fraction of seconds.
2. Accuracy: A computer performs its task with great accuracy. It does not commit any mistakes. Errors occur only when the input is incorrect.
• Limitations:
1. Limited Intelligence: As compared to human beings computers have limited IQ.
2. Dependence on Power: A Computer is an electronic machine and thus its dependence on power makes it
costly.

Briefly explain the application of computers in the field of banking and library

Banking: In the banking sector, computers provide a lot of facilities to the customers. Using online banking, you can check your past transactions. Money can be transferred to any account across the globe. Internet banking also allows you to use ATM or debit card to shop, buy tickets, pay bills for utility services, like electricity, telephone, and post paid mobiles. You can even subscribe to free monthly bank account statements and apply online to open fixed deposits.
Library: A computer helps to maintain the records of the issue and deposit date of books, encyclopedias, CDs etcIt also helps in indexing and searching a particular bookVarious magazines and journals can be read online.

What is the difference between RAM and ROM?

RAMROM
1. Random Access Memory is volatile i.e, the memory is temporary.1. Read Only Memory is non volatile i.e, the memory is permanent.
2. We can read and write the data present in the RAM.2. We can only read the data present in the ROM.
3. RAM stores the application programs.3. ROM stores the initial program to start a computer.
4. The types of RAM are SRAM, DRAM, SDRAM, and DDR.4. The types of ROM are PROM, EPROM, EEPROM and Masked ROM.

What is the need of secondary memory?

Secondary memory is used to store large amount of data and instructions permanentlyThe main memory of a computer is temporary, expensive and has limited storage capacityTherefore, data has to be stored separately in a secondary back up deviceThis will keep the information permanent and accessible for longer duration of time.

What do you mean by the statement ‘computers work diligently’?

This means a computer completes every task given to it without taking any breakUnlike humans it is reliable, accurate, and does not get tired.

Explain the difference between EPROM and EEPROM.

EPROMEEPROM
1. The contents can be erased using ultraviolet rays and then reprogrammed by an EPROM programmer.1. In this type of ROM the contents can be erased by using high voltage electricity.
2. While erasing contents by using ultraviolet rays the entire content has to be erased.2. The entire contents may not be erased as it has the option to delete selective portions of memory.
3. The chip needs to be physically removed from the system for erasing the bits.3. The chip does not need to be physically removed from the system for erasing the bits. the system for erasing the bits.

Explain the usage of Minicomputers.

Minicomputers- The capabilities of a Minicomputer are between Mainframe and Personal computer. These computers are used in business, education and many other government departments. Although some Minicomputers are designed for a single user, yet most of them are designed to handle multiple terminals. These computers are used as web servers. Single user Minicomputers are used for sophisticated design tasks.

Write the full form of PROMEPROMEEPROMSRAM, and DRAM.

PROM – Programmable Read-Only Memory
EPROM – Erasable Programmable Read-Only Memory
EEPROM – Electronically Erasable Programmable Read-Only Memory
SRAM – Static Random Access Memory
DRAM – Dynamic Random Access Memory

Write short notes on: 1) Blog, 2) Wikis

The word “blog” comes from “Weblog”, because a blog consists of a signed and dated log of individual postings. A blog is an easy-to-create website that allows the users to share their thoughts with the world. The topic of the blog can be anything from personal to professional. Blogging can be an interactive activity. Readers can add comments to the blogger’s postings and other persons can respond to it.

A wiki is an easy to use collaborative website on which the users can share or modify the content directly from the web browser. As compared to a blog, the content in wiki is normally created without any defined owner. Wikipedia (online encyclopedia) is the most popular wiki-based website and is one of the most widely viewed
site in the world.

Section 3: APPLICATION BASED QUESTIONS

Rohit Kumar is a Director Marketing of a company which requires him to travel extensively. He has to keep himself updated with the information of head office. He also prefers to type using a keyboard instead of writing on the screen. Which type of computer will you suggest him considering the nature of his job?

Laptop computer

Mr X is working in the National Weather Forecasting Agency. His job is to telecast the daily weather forecast to the national television. Which type of computer is used to forecast the weather conditions?

Supercomputer

Which type of computer system is used in appliances that have a digital interface, like microwaves, cell phones, and wrist watches? Kindly suggest

Embedded computer system

I am the first Microcomputer which was designed in 1981 by IBM. Who am I?

IBM-PC

I am the central Server of an airline company. I interact with customers and answer their queries regarding airline bookings, cancellations, and current flight status. Guess the type of computer I am.

Mainframe computer

Section 4: APPLICATION BASED QUESTIONS

Which type of computers do Indian Railways use to interact with the customers for the various online functions, like booking, cancellation, showing the current status and so on?

Mainframe computer

I am a perfect combination of Analog and Digital computer. I accept analog signals, convert them to digital and process them in digital form. Who am I?

Embedded computer

Rahul is working in the National Research Centre which predicts natural calamities, like earthquake, tsunami, etc. Which type of computer is used in this kind of research?

Supercomputer

Ms Khanna is a professor of English in a university. She has to keep herself updated with the latest research in her field. She is not comfortable in using a keyboard. Which type of computer will you suggest her considering the nature of her job and preference?

Tablet

I am a component of CPU which performs logical operations. Identify me.

ALU

Section 5: SHORT ANSWER TYPE QUESTIONS

What are the basic organizations of a computer system?

A computer system has three basic parts – Input unit, CPU, and Output unit.

Mention the three components of a CPU.

The three components of CPU are – Memory, Control Unit and ALU.

What are the major strengths of a computer? Name them.

The major strengths of a computer are: a. Speed, b. Accuracy, c. Reliability, d. Storage capacity and e. Versatility.

Name the two types of primary memory.

The two types of primary memory are: a. RAM – Random Access Memory and b. ROM – Read Only Memory.

Give a real life example of RAM and ROM.

The commonly used calculator is a real life example of RAM. A DVD resembles ROM, as the contents of disc once burned cannot be changed.

Which unit is used to measure the speed of a processor?

The processing speed of a computer is measured in Gigahertz (GHz).

Name a storage device that is a part of secondary memory.

Hard disk

Which is the smallest unit of memory?

Bit

What is the full form of BIOS?

Basic Input/Output System

Name any two processor (chip) manufacturing companies.

International Business Machine (IBM) and Hewlett Packard (HP) are processor chip manufacturing companies.

Give three examples of input and output devices.

Input devices – Mouse, Keyboard, and Scanner.
Output devices – Printer, Monitor, Plotter

Write any five characteristics of a computer.

Characteristics of a computer are: a. High speed, b. Accuracy, c. Reliability, d. Large storage capacity and e. Versatility.

Section 5: LONG ANSWER TYPE QUESTIONS

Explain any two limitations and characteristics of a computer.

Characteristics of computer:
a. Speed – A computer works with much higher speed and accuracy compared to humans.
Computers can process millions (1,000,000) of instructions per second. The time taken by computers for their operations is microseconds and nanoseconds.
b. Diligence – A computer can perform millions of tasks or calculations with the same consistency and accuracy. It doesn’t feel any fatigue or lack of concentration. Its memory also makes it superior to that of human beings.

Limitations of computer:
a. No intelligence – A computer is a machine that has no intelligence of its own to perform any task. Each instruction has to be given to the computer. A computer cannot take any decision on its own. It functions as per the user’s instruction, thus it is fully dependent on humans.
b. No feeling – Computers have no feelings or emotions. It cannot make judgment based on feeling, taste, experience, and knowledge unlike humans.

How are computers used in the field of Research and Education?

Uses of computers in scientific research – Computers help to analyse and compile huge data used in scientific researches. This creates research results with fewer errors and better engineered products. Computers can analyse percentages of materials present in a variety of compounds from soil samples to chemicals and even the air we breathe. Scientific research often requires that complex mathematical equations be solved in order to check the validity of data.

Uses of computers in education – In education sector, teachers use computers to record grades, calculate averages, and manage attendance and access data on student performance in online programs and assessments. Students and teachers can download and store a lot of educational materials, books, presentations, lecture/ address notes, question papers, and so on in computers. Students can find many different ways to solve a certain problem given to them. Through computer, they can interact with people around the world for discussing on certain topic. One of the primary uses of computers in education is ‘the Access to the Internet’ for information search about any topic.

How are computers used in the field of sports and military?

Uses of computers in sports: In sports they are used in high speed cameras for capturing minute details. In many team-based games, real time planning is done with the help of computers by analysing the current situation and using probabilities. They are also used for training purposes.

Uses of computers in military: Computers are used in military for communications through radar, controlling missiles, etc. They are also used for planning missions. Navy and Airforce take advantage of computers for calculating and planning attacks, and controlling giant weapon and gadgets.

Explain the importance of computers in the government sector and law enforcement.

Uses of computers in government
sector – Government employees use computers for communication, word and data processing and project management among other applications. The government uses computer applications and databases to maintain the records of citizens and government employees. These records are crucial to government operations.
Computers are used to gather statistical information in areas such as education, commerce, the economy, and demographics. The information is then analysed and used to make various decisions.

Uses of computers in law enforcement – Computer technology allows law enforcement services to store and retrieve vast amounts of data. This information can include details of incident reports, criminals’ descriptions, fingerprints and other identifying marks. It can also include descriptions and registrations of vehicles involved in criminal activity.

What are the application of computers in engineering and manufacturing fields?

Uses of computers in engineering – One of the major uses of computer technology in engineering is with CAD software.
Computer aided design software is the application of computer technology for the purposes of design. Many engineers rely on computer software in order to ensure accuracy in their projects.

Uses of computers in manufacturing – Computers are used extensively in all types of manufacturing. Their main uses revolve around product design, logistics, personnel management, and especially automation of machinery: Most of the logistics of a factory, including material stocks, scheduling, and job tracking are also managed using computers.

Explain the input, process and output cycle for the withdrawal of 2000 rupees from your savings account, using an ATM card.

INPUT:
a. Insert your ATM card in the machine. b.
Enter your pin.
c. Enter the amount of cash (Rs. 2000) to
be withdrawn from your account. d. Then, choose savings account from the displayed options. PROCESS:
a. The machine will verify your details. b. It will count the notes.
c. It will make the transactions from your savings account and update the withdrawal details.
d. Machine processes the money that equals Rs. 2000 and sends it to the output unit.
OUTPUT:
a. The amount dispenser of the ATM machine is its output unit. b. It gives you Rs. 2000, collect it.

Differentiate between Primary and Secondary memory.

Difference between primary and secondary memory:
PRIMARY MEMORY: Basic Primary memory is directly
accessible by Processor/CPU.
SECONDARY MEMORY: Secondary memory is not directly accessible by CPU. Altered Name Main memory. Auxiliary memory.
Data Instructions or data to be currently executed are copied to main memory. Data to be permanently stored is
kept in secondary memory.
Volatility Primary memory is usually volatile. Secondary memory is non-volatile.

Formation Primary memories are made of
semiconductors. Secondary memories are made of magnetic and optical material.
Access Speed Accessing data from primary memory is faster. Accessing data
from secondary memory is slower. Access Primary memory is accessed by the data bus. Secondary memory is accessed by input-output channels. Primary memory
Size: The computer has a small primary memory. The computer has a larger secondary memory.
Expense Primary memory is costlier than secondary memory.
Secondary memory is cheaper than
Memory Primary memory is an internal memory. Secondary memory is an external memory.

What is a CPU? Explain the different parts of a CPU.

CPU stands for Central processing unit. It is also known as microprocessor or processor. A CPU is the brain of a computer. It is responsible for all the functions and processes performed by the computer. The three components of the CPU are following:
a. Arithmetic Logic Unit (ALU) – It performs arithmetic calculations like as addition, subtraction, multiplication and division as well as
comparisons.
b. Control Unit (CU) – It controls and co- ordinates computer components. It extracts instructions from memory, decodes and executes them. It regulates the flow of information by sending and receiving signals to all other components of the computer.
c. Memory Unit (MU) – It stores the data and instructions that are required by the processor.

What do you know about Microcomputers? Explain any two types of Microcomputers, which you commonly find in day to day life.

Microcomputers are designed with
microprocessor as well as it consists
single chip that is CPU (Central
Processing Unit), data memory (RAM,
ROM), and I/O buses; these are connected on the motherboard. It is used in the home appliances such as microwaves, TV, refrigerator, and more. Some common types of microcomputers are:
a. Desktop microcomputer – It is the most common type of microcomputer used in offices, schools, shops, etc. This computer is placed on the table and it is connected to various components through wires such as keyboard, mouse, and monitor.
b. Laptop microcomputer – It can also perform various complex functions like as Desktop computer. It is able to run on its in-built battery as well as wall outlet power supply. These micro computers are more expensive than desktop computers because of its various small size components such as keyboard, touchpad,
LCD display, and other internal components (Motherboard, CPU, Hard disk, and more). Its biggest advantage is its portability.

Explain the most powerful category of computers.

Supercomputer is the most powerful category of computer. Supercomputer is a term used to describe computers that have the most capable processing power of its time. Early supercomputers in the 60s and 70s used just a couple processors, while the 90s saw supercomputers with thousands of processors at a time. Today, modern supercomputers run hundreds of thousands of processors, capable of computing quadrillions of calculations in just a few nanoseconds. Supercomputers are used in computational science to calculate and carry out a plethora of complex tasks. Modelling molecular structures, weather forecasting, and the field of quantum mechanics, among others, relies on supercomputers and their intense processing power to solve their equations.

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