Computer Studies (general group) Solved Past Paper 10th Class 2012 Karachi Board


Choose the correct answer for each from the given option:

(i) Symbol used in flow chart showing starting of Program:
(a) Terminal
(b) Flow line
(c) Diamond box
(d) Process box

(ii) Base of Hexa-Decimal number system is:
(a) 10
(b) 8
(c) 16
(d) 18

(iii) This DOS command shows the information about the disk:
(a) VER
(b) DIR
(d) VOL

(iv) English codes used in Assembly Language are called:
(a) Binary code
(b) Mnemonics cotU
(c) Special code
(d) None of these

(v) Fortran Language was developed in:
(a) 1975
(b) 1957
(c) 1967
(d) 1970

(vi) Data in the form of combination of numbers and alphabets is called:
(a) Numeric
(b) Integer
(c) Real
(d) Alphanummc

(vii) This statement determines whether the condition is true or false:
(a) Let
(b) Next
(c) If-then
(d) Read

(viii) It gave the concept of modem computer:
(a) Analytical engine
(b) Pascal Calculator
(c) Punched card .
(d) Hollerith machine

(ix) This Command makes a blank disk useable:
(a) Fonnat
(c) Deltree
(d) Copy

(x) Sign used with the string variables:
(a) •
(b) $
(c) ?
(d) %

(xi) It is very slow in access to data because it is sequential stage device:
(a) Hard disk
(b) Magnetic disk
(c) Magnetic tape
(d) CD

(xii) Set of Programs which is manufacture:
(a) General Software
(b) Application Software
(c) System Software
(d) None of thse

(xiii) The process of writing instructions in appropriate programming language is called:
(a) Testing
(b) Defining
(c) Debugging
(d) Coding

(xiv) Sign of equality (=) is a/ an:
(a) Not
(b) Arithmetical
(c) Logicai
(d) Relational

(xv) Statement used to accept data from lreyboard:
(a) Print
(b) Goto
(c) If-then
(d) Input


Q..2 Define Memory Unit and describe its two major types.

Memory Unit
It is an internal physical part of computer and directly controlled by computer. Memory Unit is also known as main memory or internal storage where data is stored at identified locations and is always accessible


Bit is the smallest non-addressable unit of storage which a computer recognizes. Bit is an abbreviation of binary digit which may be on or off. It is also represented by 0 or 1


A byte is the smallest addressable unit of storage location capable to accommodate the character. The character may be an alphabet (a to z or A to Z) a numeral (0 to 9) or a special symbol (like I (a) % and ere) usually a byte consists of 8 bits while some micros have byte of 16 bits or 32 bits. A byte is denoted by letter “B”.

Q.3 Describe the 3rd and 4th Generation of Computer.

3rd Generaon Of Computers

In this Integrated Circuits were invented due to which computers became very small, speed and accuracy was also increased. Maintenance became easy and I/O devices became faster and reliable. Programs were written in high level languages. Some popular computers were IBM-360, IBM-370, etc

4th Generation Of computers

In this generation, microprocessors were invented due to which computer’s speed and reliability was increased. The I/O devices became very fast. Some popular computers were 386 SX, 386 OX, 486 OX, Pentium computers etc.

Q.4 Explain Printer and its types.


Printer is a device that accepts text and graphic output from a computer and transfers the information to paper, usually to standard size sheets of paper. Printers are sometimes sold with computers, but more frequently are purchased separately. Printers vary in size, speed, sophistication and cost

Types of Printers

(1) Impact Printers
(2) Non-Impact Printers

Q.5 Write full mimes of the following:
Formula Translation .
Universal Automatic Computer
(iii) COBOL
Common Business Oriented Language

Q.6 Differentiate between Data and Information.

data Information

data Information

Q.7 What is operating System? Explain.
Operating System
Operating system is a set of programs that control and supervises the hardware of a computer and provide services to application. software. programmers and users of computer. The primary goal of an operating system is to make the computer convenient to use. The secondary goal is to use the computer efficiently. Some important task of an operating system are managing the resources of the computer such as Central Processing Unit (CPU), memory, disk drives and printers and running user programs. Every type of computer has its own operating system

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Digital Computers

Digital computer represent physical quantities with the help of digits or numbers. These numbers are used to perform Arithmetic calculations and also make logical decision to reach a conclusion depending on the .dara they receive from the user. All the personal computers belongs to this category. Digital computers can be classified into three groups.

Analogue Computers

Analogue computer dial with continuously varying physical quantities such as current, voltage, pressure, temperature. They are mainly used for simulating or monitoring and controlIing continuous process in industry or scientific research. The
accuracy of data used in Analogue Computer is directly related to the precision of its measurements.

Hybrid Computers

The hybrid computers combine the characteristics and advantages of both digital and analogue computers. They have the speed of Analogue computers and the accuracy of digital computers and being equipped with special conversion devices, its utilities both analogue and discrete representation of data. For example speed of Analogue computer and memory and accuracy of digital computers.

What is “Data”? Explain each type of data with example.


The word “Data” is derived from Latin language. It is plural of Detum (But Data is usually used as a singular term). Datum (singular) and Data (Plural). Data is any collection of facts or figures. The data is the raw material to be processed by a computer. For example name of students, marks obtained in the examination, designation of employees, address, quantity, rate, sales figures or anything that is input to the computer is data even pictures, photographs, drawing, charts and maps can be treated as data. Computer processes the data and produces the output or result.

Types Of Data

Mainly data is divided into two types:

(1) Numeric Data
(2) Character Data

(1) Numeric Data:

The data which is represented in the form of numbers is known as Numeric data. This includes 0 – 9 digits, a decimal point (.) +/- sign and the letters “E” or “0”. The numeric data is further divided into two groups.
(i) Integer Data
(ii) Real Data

(i) Integer Data

Integer Data is in the form of whole numbers. It does not contain a -decimal point, how ever it may be a positive or a negative number.

For Example

Population of Pakistan, numbers of passengers travelling in an aeroplane, number of students in a class, number of computer in a lab etc.
2543, 7, -60, 5555, 0, +72 etc.

(ii) Real Data

Real data is in the form of fractional numbers. It contains a decimal point. It can also be positive or negative number. Real data is further divided into two types.
(a) Fixed Point Data
(b) Floating Point Data

(a) Fixed Point Data

Fixed point data may include digits (0 – 9), a decimal point, +/. sign. For example percentage of marks, weights, quantity temperature etc. -23.0007.0.0002. +9243.9. 17013 etc.
specific number of limes. In BASIC, FOR NEXT statement is used
for this purpose


This is a loop which executes the set of statements written between FOR and NEXT statements.

Repetitive Statements

Line no. FOR index = <constant variable exprcssion> to <constant variable expression> STEP <constant variable
<Body Statements>
Line No. NEXT Index

(2) Controlled Loop

Controlled loop is used to extend the statements or the set of statements till a specific condition is satisfied. In this loop, the number of repetitions is not pre-defined. It depends upon the given condition. In BASIC, WHILE-SEND statement is used for this purpose.


This is a loop similar to the FOR-NEXT loop. The only difference is that this loop is used when the number of interactions is not known in advance to the programmer i.e, it is a post test loop.


Line No. WHILE <condition>
<Body Statements>
Lien no. WEND

(ii) Development history of Computer

History and Development of Computer

Throughout history man has been looking constantly for ways of making calculation easi;;. For this purpose Chinese
made a wooden frame device known as “ABACUS” or
“CONTINUE FRAME”. The first recognized calcularingsdcvlces
was Napier’s Bones and the slide rule was the next calculating
devices developed in early 13th century. Blaise Pascal developed
the first mechanical calculator in 1642 and the result could be
obtained upto eight digits. In 1671 Gotfried W.Von Leibnitz
invented a better calculating devices as compared to Pascal device
which could only add and subtract but Leibnitz’s device could
multiply and do square root also.

French engineer Joseph Marie Jaquard developed a punched
card system for the power looms in 1801. Herrna Hollerith for the
first time used punched card in this machine. In 1964 John Von
Neumann brought a revolution in computer technology by
introducing standard program in EDVAC (Electronic Discrete
Variable Automatic Computer).

In 1948 Howard H. Aiken developed an Electro-Mechanici

Floating Point Data

Floating point data may include digits (0 – 9), decimal point, +/- sign and letters “D”, “d”, “E”or toe”.The data which is in the exponential form can be represented in the floating point notation. For example speed of light, mass of atomic particles, distance between stars and etc.

1.602 )( 10-” (Charge of electron in coulomb)
2.9979 x 10′ (Velocity oflight in m/sec, etc.)
The values can be fed into the computer as 1.602 E -19,2.9979E8 respectively.

(2) Character Data
Character data- falls into two groups.
(a) String Data
(b) Graphical Data

(a) String Data
String data consists of the sequence of characters. Characters may be English alphabets, number of space. The space which separates two words is also a character. The string data is further divided into two types.

(i) Alphabetic Data
(ii) Alphanumeric Data

(1) Alphabetic Data
The data which is composed English alphabets is called Alphabetic Data. Names of people, names of places, names of items are considered alphabetic data. For example Ahmed, Hyderabad, chair etc.

(ii) Alphanumeric Data
The data that consists of alphabets as well as numerals and some special characters is called Alphanumeric data. Address, employees, code etc. are alphanumeric data. For example 101B, Block No.2, E/03 ere .

(b) Graphical Data

It is possible that pictures. charts and maps can be treated
.as data. The scanner is normally used to enter this type of data.
The common use of this data is found in the National Identity
Card. The photographs and thumb impression are scanned and
stored into the computer to identify a person

Q.19(a)Draw the Generation table of Computer.
(b) Define the following in detail.
(i) Loop and its types


loop is a technique which executes an instruction or group of instruction repeatedly. It is also observed that a combination of IF and GOTO statement can also be used as a loop.

The following two types of loops are commonly used.

(1) Counter Loop
(2) Controlled Loop

( 1) Counter Loop

Counter Loop is used to execute a set of statements for a Computer named as Mark – I. This is considered to be one of the first true computers because it could store information and instructions.

The first commercial computer UNIVAC-} was developed in 1951.
The development of computer could be categorized into the five generations based on technology used for machine.

(iii) Software package and its types

Software Package

Apart from the usual computer programs some application programs are developed for different utilities of work ranging from commercial to scientific purposes. These packages are easy to use and fairly quick of the appropriate data processing methods are applied. Some of the commonly used packages for general users are:
(1) Word Processing
(2) Database Management
(3) Business Data Analysis or Spreadsheets

A brief summary of these applications and the facilities provided by different packages is given below.

Word Processing:

Word Processing is often considered as the “backbone” of applications for office automation. Word Processors are also called electronic typewriters. These packages provide .the extra benefits of memory for storage. re correction, facility, merging of different documents, setting margins, spell checking, block f~cilities and so nta~y other functions which are not available in the common typewriters.

Database Management System

These types of packages arc used to organize, calculate and draw calculations from large organizational data. The common examples arc the preparation of employee’s payroll calculations and stock inventory. The packages which can be used for this purpose are Dbase, Fox Pro, Oracle and Recital etc.

Business Data Analysis System or Spreadsheets

These packages are used in business application. Spreadsheets provide a very efficient modes of mathematical calculations on tabular data. Instead of performing calculations on single elements of data they provide facility for performing calcularions on the whole column or row of a table to the supplied data. some of the commonly used spreadsheets are Lotus 123 and Quadro Pro.

Posted on December 22, 2015 in 10th Class 2012 Karachi Board Past Papers

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