Question

PLEASE ANSWER ALL

1.5 If all rainbow colors are to be represented by a unique bit pattern, how many bits would be needed to store each color? Why?

1.6 What is the usage of each of the following elements in a Graphical User Interface (GUI)?

a. windows

b. icons

c. buttons

d. sliders

1.10 What is the significance of a Domain Name System (DNS) in the Internet? What would happen without a DNS?

1.12 Explain the difference between a web browser and a web server.

1.14 Give examples of the three categories of Java identifiers and explain the differences between them.

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Answer 1

The answer of the question is provided below, please comment if any doubts:

1.5)

Answer: 3

Explanation:

• In rainbow there are seven colors.
• To represent “n” colors with unique bit pattern there should be at least “Ceil(log₂ n)” bits are needed.
• Thus here at least three colors are needed.

1.6)

a) Windows

• In GUI windows are used to act as a platform to display various components in GUI.
• To distinguish or separate items from one other also the GUI windows are used.
• The GUI windows can hold almost all other features of GUI, thus GUI is called as a mother board of GUI.

b) icons

• Icons are used for fast and easy recognition of items in GUI.
• Since the pictures and images are more attractive for eyes rather than plain texts icons will act as an identity of something like an activity, web-page link, etc.
• Some icons can be selectable and some are non-selectable.

c)buttons

• Buttons in GUI is used to perform some action on its click.
• A button click normally call a set of activity to be performed.
• The buttons are also used for selection function, usually radio buttons are used for this.

d)sliders

• A slider is normally a bar like control element in GUI, that is used to vary a value of some variable based its movement.
• Normally either up-down movement or left-right movement is used.

1.10)

Significance of domain name system:

• The computers or various system in internet are identified using the IP address.
• But is not possible or feasible to remember the IP address of other computers that we need to communicate.
• Also there can be multiple IP address for a single Web-page provide, in that which IP address is to be used is a complex problem.
• DNS is used to solve this problem.
• The DNS converts the web address to corresponding IP address.
• The web addresses are easy to remember and use, the we address to IP address conversion will be done by DNS system.

Without DNS:

• If DNS is not there we need to enter the required IP address to access a web address like phone number dialling.

1.12)

Web server and web browser differences:

• Web servers are places where the actual data is placed by the web page owners.
• The data that are available in a web page will be stores in a web server.
• Web browser is a client side application that is used to access the web server contents remotely.
• Web browser is user side application but web server is a data repository held to maintain a web page.

1.14)

Three categories of Java identifiers:

• The Java identifiers are names of variables that are used to represent something that valid in JAVA.
• The one type of identifier that is a string that is started with the English alphabet, both upper and lower case letters can be used to define this.
• A second type of identifiers are those starts with an under score, “_”.
• The third type of identifier is that started with dollar symbol “$”.