FOR CLASS 8 OR DLE OR BLE Part 1 - COMPUTER SCIENCE

Answer the following questions.

1.   What is computer? List it's any two disadvantages.

Ans: Computer is an electronic machine that takes instruction, processes them and gives meaningful result.

          Two disadvantages are given below:

Ø It needs electricity.

Ø It cannot think as human.

 

2.   What is micro computer? List it's types.

Ans: Micro computer is a smallest computer among super, mainframe and minicomputer. 

          Its two types are Laptop and Desktop computers.

 

3.   Define software with example.

Ans: Software is a collection of two or more programs that can make computer to do more tasks. Some examples are OS, MS-word, Excel, Photoshop, etc.

 

4.   What is internet?

Ans: Internet is the interconnection of millions of computer connected together for communication through wired or wireless connection. It is the example of biggest network.

 

5.    Define computer virus.

Ans: Computer virus is a self-replicating and destructing computer program that infects computer and destroys computer data.

 

6.   Convert the following as indicate

7.   Match the following:

Group A                                                     Group B

Napier Bone                                           Blaise Pascal

Pascaline                                                Howard Aiken

Slide Rule                                                John Napier

Stepped Reckoner                                 William Oughred

Answers

a.   Napier Bone             = John Napier

b.   Pascaline                  = Blaise Pascal

c.    Slide Rule                 = William Oughtred

d. Stepped Reckoner   = Gottfried Wihlem Von Lebiniz   (Howard Aiken is wrong option)

 

8.   Write the true of false .

a.   First generation of computer uses transistor as main circuitry.   False

b.   An analog computer is the special purpose computer.                   True

c.    Software is not physical part of computer .                                     True

d.   A computer on the network is called node.                                      True

9.   Write the technical terms.

a.   A software programs that detects and remove virus.           Antivirus

b.   The computer based on microprocessor.                       Microcomputer

c.    A group of interconnected and interlinked computer. Computer Network

d.   Rules that covers computer crime.                                Cyber Law

10.                Write full form of.

a.   ENIAC = Electronic Numerical Integrator And Calculator 

b.    ICT       = Information and Communication Technology

c.     LAN     = Local Area Network

d.    USB     = Universal Serial Bus

11.                Answer the following questions.

a.   Define Operating system with examples.

Ans: Operating system is one of the master program which control and co-ordinates the function of computer.  Without OS computer cannot work. Examples are Windows XP, Linux, Unix, Windows Vista, etc.

  

b.   What is word processing software?

Ans: Word processing software is one of the most popular computer program that help to edit, modify and design documents. Example of word processing software are Ms-word, notepad, wordpad, wordstar, word perfect, etc.

 

c.    What is chart in Microsoft Excel?

Ans: Chart is an option in Ms Excel that helps to represent data in graph. We can use different types of chart for data representation in pictorial way i.e. Pie Chart, Bar Chart, Line Chart, etc.

 

d.   What is container tag?

Ans: Container tag is a type of tag that contains starting and ending tag. It is also known as paired tag. Some examples are <p>…….</p>, <b>…….</b>, <u>…….</u>, etc.

 

12.                Write the true of false.

a.   The HTML tags are commanded in HTML document.                  True

b.   The F5 key is used to start slide show from the beginning. True

c.    The =sum (number1,…)function is used display maximum value of given numbers.  False

d.   MS-DOS is GUI based operating system.           False

13.                Answer the following questions:-

a.   what is variable?

Ans: Variable is a value or entity that can be changing during program execution. It stores constants.

 

b.   Write the uses of following:

1.   CLS statements    = It is used to clear the output screen.

2.   END statements  = It is used to terminate the program.

14.                Write a algorithm to add any two numbers.

Ans:  Algorithm to add any two numbers given below:

 

Step 1   : Start

Step 2   : Input two numbers A and B

Step 3   : Add A and B and store in sum

Step 4   : Display sum

Step 5   : End

 

15.                Write the uses of following program.

 

CLS

LET X=10

LET Y= 20

LET C=(X+Y)/2

PRINT C

END

Output

C=15

16.                Debug the following programs:-

REM program to display odd or even

BEGIN

INPUT "ENTER ANY NUMBER";N

R=N/2

IF R=1 THEN

PRINT "N IS EVEN"

ELSE R=0

PRINT "N IS SEVEN"

STOP

          Program after Debug

REM Program to display odd or even

CLS

INPUT “ENTER ANY NUMBER”;N

R= N MOD 2

IF R=1 THEN

PRINT N”IS ODD NUMBER”

ELSE

PRINT N”IS EVEN NUMBER”

ELSEIF

END

 

 

17.                Write programs in QBasic:

a.   WAP that accept length and breadth of rectangle and find out area of rectangle.

CLS

INPUT “ENTER LENGTH AND BREADTH=”; L, B

AREA=L*B

PRINT “AREA OF RECTANGLE”;AREA

END

 

 

b.   WAP that accept two numbers and find out which is greatest among them.

CLS

INPUT  “ENTER TWO NUMBERS”;A, B

IF A> B THEN

PRINT A” IS GREATER”

ELSE

PRINT B” IS GREATER”

END

 

c.    WAP that display your school's name 5 times using any loop.

CLS

INPUT “ENTER YOUR SCHOOL’S NAME”;N$

FOR I = 1 TO 5

PRINT N$

NEXT

END