Tuesday, February 10, 2015

ITKT(Computer) Cycle Test - 4

Chapter – 10 – More on Java
Ø  Fill in the Blanks:-
1.  A symbol or function representing a mathematical operation is called operator.
2.  Arithmetic operators are used to perform arithmetic operation like addition,
subtraction, multiplication, division and remainder.
3.  The relational operators compare two operands.
4.  Logical operators check two or more than two conditions.
5.  If statement is used to specify condition in the program.
6.  If ..else statement is used to handle operations when the condition is true or when it is false.
7.  When there are more than two conditions to be checked in the program, then
else .. if statement is used.

Ø  Question and Answers:-
1.     Explain Arithmetic Operator.
Þ     Arithmetic Operator to perform arithmetic operations like addition, subtraction, multiplication, division etc.

     



   
2.    Explain Relational or Comparison Operators.
Þ     These operators are used to perform operations which require comparison between two operands.
 






3.  Explain Assignment Operator.
Þ     Assignment operator is used to assign value to a variable.
Example : A=5;  
means a value 5 is assigned to the variable A
            int age=15;
            float marks=67.5;
            char alpha=‘E’

4.  Explain Logical Operator.
Þ     When in the program we have to specify two or more conditions, then the logical operators are used.




  
5.    Explain If Statement.

Þ     It is used to test a condition and execute a certain section of code only if the condition evaluates to true.
Or
If statement is used when you need to specify the condition in your program. It tells your program to execute a certain section of code only if the specified condition evaluates to true.

Þ     Syntax :
if (condition is true)
 {
 … statements to be executed
 … statements to be executed
}

Þ     Example :
public class Stud1
{
float comp=99;
float sci=100;
public void findLargest()
{
if(comp>sci)
{
System.out.println(“Computer marks are more than Science”);
}
}
 }

Þ     Output:

it will not display anything on screen.

In above program, the if condition holds true then the message “Computer marks are more than Science” will be printed on the screen otherwise no message will be displayed on the screen.





6.    Explain If..else Statement.
Þ        if…else statement is used when some action has to be taken for both cases, when the condition is true and also when the condition is false.

Þ     Syntax :
if (condition is true)
 {
 … statements to be executed when condition is true
}
else
{
 … statements to be executed when condition is false
}

Þ     Example :
public class Stud1
{
float comp=99;
float sci=100;
public void findLargest()
{
if(comp>sci)
{
 System.out.println(“Computer marks are more than Science”);
}
Else
 {
System.out.println(“Science marks are more than Computer”);
}
}
}

Þ     Output:
Science marks are more than Computer.





7.    Explain If..else..if Statement.
Þ        if…else…if statement is used when we have to check for more than two conditions.

Þ     Syntax :
if(condition1 is true)
{
             …statements to be executed
}
else if(condition2 is true)
{
             …statements to be executed
}
else if(condition3 is true)
{
             …statements to be executed
}
else
{
             …statements to be executed
}

Þ     Example :
public class Stud1
{
float Eng=89; float Mat=99; float Sci=70;
float Comp=86; float SST=87;

public void Grade()
{
float per=(Eng+Mat+Sci+Comp+SST)/5;
char grade;

if(per>=90)
{          
grade=‘A’;
}
else if(per>=70)
 {
 grade=‘B’;
 }
else if(per>=50)
{
 grade=‘C’;
 }
else if(per>40) 
{
 grade=‘D’;
}
else
 {
grade=‘F’;
}
}
System.out.println(“Grade = ” +grade);
}


Þ     Output:
Grade =  B.

Ø  Text Book Exercise :-





Output of prog A:                                                                         Output of prog B:

3                                                                                                          4
2                                                                                                          9
4                                                                                                          5
2                                                                                                        10
3                                                                                                          4

Chapter – 11 – Computer Network

Ø Fill in the Blanks:-
1.     The term Computer Network means an interconnected collection of autonomous computers.
2.    The Computer Networks are classified depending on transmission technology and scale.
3.    The different types of networks are LAN, WAN, MAN and Wireless Networks.
4.    Topology is the term used to describe the way through which computers are connected in a network.
5.    A network provides the necessary resources for data communication over the network.
6.    The  data  can be in the form of text, sound, video, images, files, etc.
7.    A node which cannot process information and no hard disk attached is called Dumb Terminal.
8.    The LANs inside the WAN are called sub-networks.
9.    Wan consists of a collection of machines which are called hosts.
10. Metropolitan Area Network  is connected through Telephone lines.
11.  Wireless Network is possible through infrared, satellites and radio waves.
12. The communication line through which data flows from one computer to another is called network channel.
13. Various types of cables like Coaxial, Fiber Optic, Twisted Pair are used for transmission of data in a network.

Ø  Question and Answers:-

1.  What is a Network? Advantages of using Network?
Ans :
The term “Computer Network” means an interconnected collection of autonomous computers. Any two computers are said to be interconnected, if they can exchange information or data.
Advantages of using Network:
1.     To transfer files from one computer to another.
2.    To share applications software there by reducing the cost of multiple copies of the software.
3.    The various resources like – printers, scanners, CD-ROM drives can be shared.
4.    Effective data communication system over the network reduces the paper work. Thus it helps in making almost a paperless office.
5.    A network enables access to database located centrally on a server or distributed on machines.
6.    Railways and Airlines reservation is not possible without a network of computers.
2.  Components of a Computer Network?
Ans :
1)  Servers :
Servers can be mainframes, minis and micros which can support various software, to store and process information at high speed.
2)  Nodes :
The Computers attached to the network for the users to carry out their tasks using network and server.
Even printers, scanners etc. Attached to the network are called nodes.
3)  Workstation :
A powerful node which can handle local information processing is called a workstation.
A workstation has a small hard disk attached it to carryout local tasks.
4)  Network Operating System :
To control all the information transfer activities on the network, software called Network Operating System is used.
Ex: - Windows NT, Windows 2000.
5)  Cables :
It is the medium or channel over which the information travels from computer to computer.
Various types of cables viz. Coaxial, Fiber Optic, Twisted Pair are used for transmission of data in a network.
6)  Network Interface Card :
It is plugged into a computer to work with the network operating system to control the flow of information over the network.
7)  Hubs :
They are used for extending a network to attach additional workstation to it.
8)  Switches :
They are used for forwarding data packets directly to the parts having particular network address.
9)  Repeaters :
It is an unintelligent device connecting two network segments of same type. It moves the signals from one network segment to another by regenerating, re-timing and amplifying it.
10)      Bridges :
It is used to connect two groups of computer of the same type so that they can exchange data.
11)      Routers :
They are intelligent connecting devices which are used to send packets to the correct local area network segments and finally to their destination.
12)      Gateways :
These are shared network connections between local area networks and wide area networks. Internet Service Provider (ISP) are gateway nodes.


3.  Types of Network? Explain.
Ans:
Computer networks are classified depending on transmission technology and scale.
Different types of networks are:

1.      Local Area Network (LAN)
2.    Wide  Area Network (WAN)
3.    Metropolitan Area Network (MAN)
4.    Wireless Network
( also refer page no : 114 from textbook )




1.  What is a topology? Explain different types of topologies.
The physical arrangement of the cables, computers and other peripheral devices to form a network is known as a topology
Ex – Linear Bus topology or Bus topology, Star topology, Ring topology, Tree topology

1.     Bus topology – Bus topology is made up of a main single cable with the terminators at the both ends. Computers and other devices including the server are connected to this linear cable for communication.
Advantage:
Easy to add or remove any node to this network.
Disadvantage:
In case of break in main cable whole network can shut down.




2.    Star topology – Star topology is the most common topology used. All the workstations are connected to the central connection point calls a hub. Any data sent to the other computer, first goes to the central hub and from there it is redirected to the destination computer.
Advantage:
Easy to install and cabling and easy to detect faults and
If any node gets broken network does not shut down.
Disadvantage:
More expensive & require more cable length.






3.    Ring topology – In a ring topology, every workstation has exactly two neighbors for communication purpose. All messages travel through a ring in the same direction either ‘clockwise’ or ‘anticlockwise’.
Advantage:
It cannot have any routing problem as data will be received by every node.
Disadvantage:
If a single connection gets broken whole network can shut down.






4.    Tree topology – It is a combination of linear bus and star topology. It consists of groups of star configured workstation connected to a linear bus back bone cable.

Advantage:
The point to point wiring for individual segments.
Disadvantage:
           It is difficult to configure and wire than any other topology.







( also refer page no : 115 to 117 from textbook )


Ø  Exercise:-







 Note :- 

for better exam preparation also refer textbook and work book along with this material.

















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