Explain the term search engine as used in the Internet

​​(a) (1) Explain the term search engine as used in the Internet. (2 marks)

(i) Search-engine
It is a web-based application used to locate for an item or information from world wide web.

(ii) Peter intends to download a movie from the Internet. State the three factors that may determine the total time taken to complete the download. (3 marks)

Factors that affects duration of download

1. The size of the video
2. The band width of the media used
3. Availability of network
4. Other activities that may be running in the computer.
5. Other restrictions enforced in the computer
6. The restrictions by the ISP
7. Speed of computer

​​(b) Wakulima online is an  organization that runs a web based system for assisting obtain market for their farm produce. State four technological reasons that may  farmer not to access the organization system.

Causes of Wakulima system’s failure

1. Lack of power supply to the system servers.
2. Network infrastructure breakdown/poor network coverage/lack of connection.
3. Program failure in the system/malware (virus).
4. Hardware failure in the system.
5. Human action which could be accidental or intentional.
6. Lack of access rights.
7. System overload

​​(c) Explain a situation when each of the following Desktop Publishing program features may be used when creating a publication:

(i) cropping; (2 marks)

• Used when handling a graphic and there is a need to remove some of the portions in the graphic.

(ii) transparency, . (2 marks)

• Used when there is a need to make the background of a graphic to be visible.

​​(d) List two areas where infrared waves are used in data communication (2 marks)

Areas where infra-red radio waves are used.

• TV remote control communication;
• DVD remote control communication
• Communication between peripheral devices and the computer
• Data link over short distance using mobile phones
• Radio remote control
• Remote locking / opening doors/devices

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