Plus One Computer Science Chapter Wise Questions and Answers Chapter 12 Internet and Mobile Computing

Kerala Plus One Computer Science Chapter Wise Questions and Answers Chapter 12 Internet and Mobile Computing

Very Short Answer Type Questions
(Score 1)

Question 1.
ARPANET stands for
Answer:
Advanced Research Projects Agency Network

Question 2.
Who proposed the idea of www?
Answer:
Tim Berners Lee

Question 3.
The protocol for internet communication is
a. TCP/IP
b. FTP
c. HTTP
d. none
Answer:
a. TCP/IP

Question 4.
A short distance wireless internet access method is
a. satellite
b. bluetooth
c. Wimax
d. all of these
Answer:
c. Wimax

Question 5.
Name the protocol used for email transmission across internet,
a. TCP/IP
b. FTP
c. HTTP
d. SMTP
Answer:
d. SMTP

Question 6.
Each document on the web is referred using
Answer:
URL

Question 7.
The small text files used by browsers to remember our email IDs, usernames etc are known as
Answer:
cookies

Question 8.
The act of breaking into secure network to destroy data is called hacking.
Answer:
unethical/black hats

Question 9.
The protocol used to send SMS is called
Answer:
SS7 (signalling system No.#7)

Question 10.
SIM stands for
Answer:
Subscriber Identity Module

Question 11.
Which of the following is not a search engine?
a. google
b. bing
c. yahoo
d. facebook
Answer:
d. facebook

Question 12.
Find odd one.
a. firewall
b. antivirus scanners
c. cookies
d. microblogs
Answer:
d. microblogs

Question 13.
What is a blog?
Answer:
Conducting discussions about particular subjects by entries or posts.

Short Answer Type Questions
(Score 2)

Question 1.
What is a GPS?
Answer:
Global Positioning System (GPS) is space based satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites.

Question 2.
How can multimedia content be sent using mobile phones?
Answer:
Multimedia Messaging Service (MMS) is the standard way to send and receive messages consisting of multimedia content using mobile phones.

Question 3.
What are the functions of mobile operating system? .
Answer:
It is an OS used in hand held devices such as smart phone, table, etc. It manages the hardware, multimedia functions, internet connectivity, etc. eg., Android, iOS.

Question 4.
What do you mean by an “always on” connection?
Answer:
Wired broadband connection that need not be dialled and connected is called “always on” connection.

Question 5.
What is phishing?
Answer:
It is an attempt to get others information such as usernames, passwords, bank a/c details etc by acting as the authorized website. Phishing websites have URLs and home pages similar to their original ones and mislead others, it is called spoofing.

Question 6.
What is quarantine?
Answer:
It is a special area for storing files infected with viruses. It protected the file from running.

Question 7.
Compare intranet and extranet.
Answer:
Intranet: A private network inside a company or organisation is called intranet.
Extranet: It allows vendors and business partners to access the company resources.

Short Answer Type Questions
(Score 3)

Question 1.
What are the disadvantages of email?
Answer:

It requires a computer, a modem, software and internet connection to check mail.
Some mails may contain viruses.
Mail boxes are filled with junk mail. So very difficult to find the relevent mail.

Question 2.
What are the advantages and dis-advantages of social media?
Answer:
Advantages are:

Bring people together: It allows people to maintain the friendship.
Plan and organise events: It allows users to plan and organise events.
Business promotion: It helps the firms to promote their sales.
Social skills: There is a key role of formation of society.

Disadvantages are:

Intrusion to privacy.
Addiction.
Spread rumours.

Long Answer Type Questions
(Score 5)

Question 1.
What are the guidelines for using computers over internet?
Answer:

Emails may contain viruses so do not open any unwanted emails.
Download files from reputed sources (sites).
Avoid clicking on pop up advt.
Most of the viruses spread due to the use of USB drives so use cautiously.
Use firewall in your computer.
Use antivirus software and update regularly.
Take backups in a regular time intervals.

Question 2.
Explain about various generations in mobile communication.
Answer:
1. First Generation networks (1G):
It was developed around 1980, based on analog system and only voice trans-mission was allowed.

2. Second Generation Networks (2G):
This is the next generation network that was allowed voice and data trans-mission. GSM and CDMA standards were introduced by 2G. MMS and picture messages are introduced.

Global System for Mobile (GSM): It is the most successful standard. It uses narrow band TDMA (Time Division Multiple Access). The network is identified using the SIM (Subscriber Identify Module).
GPRS (General Packet Radio Services) is a packet oriented mobile data service on the 2G on GSM.
EDGE (Enchanced Data rates for GSM Evolution) is three times faster than GPRS. It is used for voice communication as well as an internet connection.
Code Division Multiple Access (CDMA): It is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, which is where several transmitters can send information simultaneously over a single communication channel.

3. Third Generation networks (3G):
It allows high data transfer rate for mo-bile devices and offers high speed wireless broadband services combining voice and data. To enjoy this service, 3G enabled mobile towers and hand sets are required.

4. Forth Generation networks (4G):
It is also called Long Term Evolution (LTE) and also offers ultra broadband internet facility such as high quality streaming video

Textual Questions & Answers

Question 1.
What is a virus? (2)
Answer:
A virus is a bad program or harmful program to damage routine working of a computer system. It reduces the speed of a computer. It may be delete the useful system files and make the computer useless.

Question 2.
Write a short notes on:
a. Mobile broadband (1)
b. Wi MAX (1)
Answer:
a. Accessing internet using wireless devices like mobile phones, h. Wi MAX (Wireless Microwave Access) uses microwaves to transmit information across a network in a range 2 GHz to 11 GHz over very long distance.

Question 3.
Explain the term web browser and web browsing. (2)
Answer:
Web browser is a piece of software that acts as an interface between the user and the internal working of the internet. Different browsers are Microsoft internet explorer, Mozilla Firefox, Netscape Navigator, Google Chrome, Opera, etc. Web browsing is the process of navigation through
the web pages in the www.

Question 4.
What are wikis? (2)
Answer:
Wikis allow people to add content or edit existing information in a webpage to form a community document. It is a type of content management system. Editing done by users is very closely monitored by other editors and therefore incorrect information are removed immediately.

Question 5.
How does a Trojan horse affect a computer? (2)
Answer:
It appears as a useful software but it is a harmful software and it will delete useful softwares or files. They allow malicious user access to confidential and personal information in the computer through the network without the knowledge of the user.

Question 6.
Compare GSM and CDMA standards. (3)
Answer:
Global System for Mobile (GSM) is the most successful standard. It uses narrow hand TDMA (Time Division Multiple Access). The network is identified using the SIM (Subscriber Identify Module). Code Division Multiple Access (CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, which is where several transmitters can send information simultaneously over a single communication channel.

Question 7.
Write short notes on SMS. (1)
Answer:
Short Message Service (SMS) allows transferring short text messages containing up to 160 characters between mobile phones.

Question 8.
What is a smart card? How it is useful? (2)
Answer:
It is a plastic card with a computer chip or memory that stores and transacts data. A smart card (may be like an ATM card) reader used to store and transmit data. The advantages of smart card is that it is secure, intelligent and is easy to carry.

Question 9.
Explain the features of Android OS. (3)
Answer:
Android is a Linux based operating system designed for touch screen mobile device. The user interface of android is based on touch inputs like swipping, tapping, pinching and reverse pinching to manipulate on-screen objects. It consists of a kernel based on Linux Kernel, which has a powerful memory and process management system, permission based security structure and open source nature.