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Chapter 1 - Unit 1

Components of a Computer System

Class 7 - APC Understanding Computer Studies


Choose the correct option

Question 1

Which of the following is not a hardware?

  1. Mouse
  2. Random Access Memory
  3. Keyboard
  4. Operating System

Answer

Operating System

Reason — Operating System is a system software. Rest all are hardware.

Question 2

Which of the following devices is used to transfer data from source to destination over internet?

  1. Thumb drive
  2. RAM
  3. ROM
  4. MODEM

Answer

MODEM

Reason — A Modem converts analog signals to digital signals and vice-versa facilitating the transfer of data between devices through the internet.

Question 3

Which of the following is not an operating system?

  1. MAC
  2. UNIX
  3. LINUX
  4. Microsoft

Answer

Microsoft

Reason — Microsoft is the name of the company founded by Bill Gates that creates Windows and DOS operating system.

Question 4

What is the full form of SMPS?

  1. Simple Machine Power Supply
  2. Simple Motor Power Supply
  3. Switched-Mode Power Supply
  4. System Mode Power Supply

Answer

Switched-Mode Power Supply

Reason — SMPS or Switched-Mode Power Supply provides regulated power to the computer system.

Question 5

Which of the following is not an application software?

  1. MS Word
  2. Android
  3. MS Excel
  4. Notepad

Answer

Android

Reason — Android is an operating system hence it is a system software. Rest all are application software.

Fill in the blanks

Question 1

A computer system coordinates between hardware and software.

Question 2

A computer is an electronic data processing machine.

Question 3

The CPU is considered to be the brain of a computer system.

Question 4

Hardware and software are complementary to each other.

Question 5

A byte is the smallest unit of memory which represents a character in a computer.

Question 6

A set of computer programs with the help of which the system works, is known as software.

Question 7

ROM (Read Only Memory) does not allow new information to be written on it.

Question 8

Serial port is used to supply data serially.

Question 9

Secondary memory is known as an auxiliary memory of the computer system.

Question 10

Ports are the connecting nodes to interface the peripheral devices with the processor.

Write down the full forms of the following

Question 1

ALU

Answer

Arithmetic and Logic Unit

Question 2

ROM

Answer

Read Only Memory

Question 3

BIOS

Answer

Basic Input Output System

Question 4

POST

Answer

Power-On Self-Test

Question 5

DVD

Answer

Digital Versatile/Video Discs

Question 6

SMPS

Answer

Switched-Mode Power Supply

Question 7

USB

Answer

Universal Serial Bus

Question 8

CMOS

Answer

Complementary Metal Oxide Semiconductor

Label the block diagram

Question 1

Label the given block diagram to depict the basic organisation of a computer system

Label the given block diagram to depict the basic organisation of a computer system. Class 7 ICSE Understanding Computer Studies

Answer

Label the given block diagram to depict the basic organisation of a computer system. Class 7 ICSE Understanding Computer Studies

Name the following

Question 1

Two application softwares

Answer

  1. MS Paint
  2. Microsoft Excel

Question 2

Two system softwares

Answer

  1. Windows 10
  2. Linux

Question 3

Four major parts of a computer system

Answer

  1. Central Processing Unit
  2. Memory
  3. Input
  4. Output

Question 4

Two types of primary memory

Answer

  1. Random Access Memory
  2. Read Only Memory

Question 5

Two input hardware

Answer

  1. Keyboard
  2. Mouse

Question 6

Two communication ports

Answer

  1. Serial Port
  2. Parallel Port

Question 7

Two secondary memory units

Answer

  1. Hard Disk
  2. Optical Disc

Question 8

Three components of CPU

Answer

  1. Input Unit
  2. Central Processing Unit (CPU)
  3. Output Unit

Case-Study Based Questions

Question 1

The hardware components present inside a computer are called internal hardware. The descriptions of some of the internal components are given below:

(a) This device is one of the most useful, reliable and popular secondary storage devices that consists of a number of circular metallic plates coated with iron oxide.

(b) This component is a small box placed at the back of a computer's cabinet that provides regulated power to the computer system.

(c) This component is the printed circuit board that contains processor, Integrated Circuit (IC) chips, memory devices and other hardware components.

(d) They are the connecting nodes used to connect the peripheral devices with the processor.

Identify and write the names of the devices described above in (a), (b), (c) and (d).

Answer

(a) Hard Disk

(b) Switched-Mode Power Supply (SMPS)

(c) Motherboard

(d) Communication Ports

Short Answer Questions

Question 1

Define System Software.

Answer

System software is a set of one or more programs designed to control the operations of a computer system. They support the running of other softwares and communicate with the peripheral devices.

For example, operating system.

Question 2

Define the term 'hardware' with an example.

Answer

Hardware refers to the machinery and to the various components and equipment of the computer system. It refers to all the physical devices of the computer system.

For example, monitor, keyboard etc.

Question 3

Define software. How is it classified?

Answer

Software refers to a set of computer programs, procedures and associated documents that describe how the programs are to be used. It is a collection of programs that aim at enhancing the capabilities of the hardware.

Software are classified into two types:

  1. System software
  2. Application software

Question 4

What is meant by the term 'memory'? What are its types?

Answer

Memory is the basic unit of a computer where it can store data and instructions.

Memory is of two types-

  1. Primary Memory
  2. Secondary Memory

Differentiate between the following

Question 1

Hardware and Software

Answer

HardwareSoftware
It is required to store and run a software.It refers to the programs that enable a computer to perform specific tasks.
Hardware starts functioning once a software is loaded.Software is installed on the hardware to deliver its set of instructions.
Hardware is physical in nature.Software is logical in nature.
There are more chances of failure in hardware devices.Software does not have a failure rate and hence, is more reliable.
Hardware components can be seen and touched.Software can be viewed at the time of execution/loading.

Question 2

System Software and Application Software

Answer

System SoftwareApplication Software
It is designed to control the operations of a computer system.It is designed to carry out specific tasks such as creating documents etc.
These programs help in the running of other softwares.These programs allow a computer to perform useful tasks beyond the running of the system itself.
For example- Windows 10For example- MS Word

Question 3

Random Access Memory (RAM) and Read Only Memory (ROM)

Answer

Random Access Memory (RAM)Read Only Memory (ROM)
Data or instructions can randomly be read as well as written onto it.The stored information can only be read but new information cannot be written onto it.
Any information stored in it is lost when the power supply is switched-off.The information in ROM remains intact even if the power supply is switched-off.

Question 4

Primary Memory and Secondary Memory

Answer

Primary MemorySecondary Memory
It is the main memory of the computer system.It is the auxiliary memory from where stored data can be retrieved.
Data and instructions get erased as soon as the computer is switched off.Data or instructions are stored for future use, even when the computer has been switched off.

Long Answer Questions

Question 1

Hardware and software are complementary to each other. Explain.

Answer

Hardware refers to all the visible devices which are assembled together to build a computer system. Software refers to the computer programs that are loaded into the computer system. The blending of software and hardware gives life to a computer system.

Though hardware is the physical part of a computer, it is nothing unless it has a software to control it. In a way, hardware is like a car without a driver. Software is a set of instructions that tells the hardware what to do and how to perform the requested actions.

Hence, both are essential to get the work done. Hardware and software are complementary to each other.

Question 2

What is a modem? What are its types? Explain.

Answer

A modem is a device that modulates outgoing digital signals from a computer or other digital devices to analog signals. It also demodulates the incoming analog signals and converts them to digital signals for the digital device.

Modems are of three types-

  1. Internal modem — These are attached to the internal slot of the motherboard. These are categorised as full duplex and half duplex which are used for fax and internet communications. They can also be used for data and voice communication.

  2. External modem — It is a small box connected to the communication port of the computer. It works similar to the internal modem. The only difference is that it is placed outside the CPU box.

  3. USB modem — It refers to any type of data/fax/voice modem device which can be connected to a computer using the USB port. It looks just like a USB flash drive but is smaller in size.

Question 3

What is meant by the term 'ports'? Explain the different types of ports.

Answer

Ports are the connecting nodes to interface the peripheral devices with the processor. They act as a bridge between the external devices and the CPU for data communication.

The different types of ports are as follows:

  1. Serial port — It is used to supply data serially i.e., bit by bit. It uses a single wire for communication. This port takes much time to transfer data i.e., it transfers a byte in eight tries. Serial ports are usually available with 9 pins or 24 pins and allow connections of mouse, modem etc.

  2. Parallel port — This type of port is available with a 24 pins female connector and is capable of transmitting eight bit signals at a time i.e., the bits travel parallel to each other. The transfer rate is eight times faster than a serial port. This port is basically to connect CD-writers, scanners, printers, hard disks etc.

  3. USB port — This port is usually designed to connect printers, plotters, mouse, joystick, pen drives, digital cameras etc. with a single plug arrangement. It avoids pin configuration of the ports.

Question 4

How the data is recorded on the disk and then retrieved from the hard disk? Explain.

Answer

The data is recorded on the disks through the read-write head, which resembles a record player. The information that comes from the CPU is recorded digitally (in the form of 0 and 1) on the disk surface through the read-write head. On the other hand, the information is also retrieved digitally from the disk through the read-write head to the computer system for further processing.

Question 5

What are the main functions of the CPU? Explain.

Answer

Central Processing Unit is 'the brain of the computer' and takes all the major decisions in a computer system. CPU consists of three main components. The functions of these components are as follows:

  1. Arithmetic and Logic Unit(ALU) — All the arithmetical and logical operations are performed through this unit. An arithmetical operation includes addition, subtraction, multiplication, division and logical operations include all types of comparisons.

  2. Control Unit — This unit controls each and every part of the computer system along with the peripherals. It retrieves data and instructions from the memory and sends the commands to various parts of the computer system.

  3. Memory Unit — This unit provides space for storing data, instructions, intermediate results and final results.

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