Computer Studies (general group) Solved Past Paper 10th Class 2014 Karachi Board


Q.1 Choose the correct answer for each from the given options

(i) Balise pascal invented the first calculating machine in:
(a) 1714 A.D.
(b) 1652A.D
(c) 1844 A.D.
(d) 1542 A.D.

(ii) Command shows the version of DOS.
(a) VEL
(b) VOL
(c) VER
(d) VIR

(iii) Data statement is used with:
(a) WEND
(b) READ
(c) NEXT
(d) IF

(iv) String constant must be enclosed 41:
(a) Quotes
(b) Notes
(c). Variable
(d) Number

(v) A characteristic of monitor that effects on the sharpness of
an image on the screen
(a) Net pitch
(b) Path pitch
(c) Dot pitch
(d) None of these

(vi) The command that deletes a me in GW-BASIC
(a) Delete
(b) Load
(c) Save
(d) Kill

(vii) Machine language is also called:
(a) high level language
(b) Low level language
(c) English language
(d) Assembly language

(viii) An example of non- impact printer is:
(a) Dasiy wheel printer
(b) Dnun printer
(c) Chain printer
(d) Laser printer

(ix) Artificial Intelligence was used! is being use in:
(a) 2nd Generation
(b) 4th generation
(c) 1st Generation
(d) 5th Generation

(x) The data which is in the meaningful form is called:
(a) Program
(b) Data Processing
(c) Information
(d) Data processing cycle

(xi) A standard keyboard has:
(a) 14 Function Keys
(b) 12 Functions Jury
(c) 13 function keys
(d) 10 functions keys

(xii) A soft copy is also called:
(a) Draft copy
(b) Hard copy
(c) Screen output
(d)Print out

(xiii) LCD stands for:
(a) Light Code Digit
(b) Liquid Crystal Display
(c) Liquid colour Display
(d) List Code Digit

(xiv) The removal of errors from the program is called:
(a) Algorithm
(b) Debugging
(c) flowchart
(d) Documentation

(x) High level language is similar to:
(a) Machine language
(b) Assembly language
(c) English language
(d) Binary Language


Q.2 Write in your words about Generation of computers.
Generation Of Computers
Each generation of computer is characterized by a major technological development that fundamentally changed the way computers operate, resulting in increasingly smaller, cheaper, more powerful and more efficient and reliable devices. Read about each generation and the developments that led to the current devices that we use today.

Q.3 Define “DIMM’ statement.
It is dual in line memory module. They have a 64 data bit connection to the computer. A DIMM has a 168 pin connectoi. The memory chips on SIMM are typically dynamic RAM (DRAM) chips; while on improved form of RAM called sychronous DRAM (SDRAM) can also be used. DIMM is a double SIMM

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 Why is chairees Babbage called father of computer?
Chaires Babbage
The most deserving name in the list of such pioneers is of Charles Babbage (1792-1871), a great English mathematician. Now he is known as “Father of Computer”, because he was the first man, who gave the true concept of computer. Only a part of this engine was ever constructed. It was based on the principle of difference of the square of the numbers; for certain formula the difference between certain volumes will remain constant, which consist of three basic parts .

(1) Arithmetic Logic Unit (ALU)
(2) Memory Unit (MU)
(3) Control Unit (CU)

In 1834, he envisioned and designed the first programmable proposed general purpose computation machine called Analytical Engine. Charles Babbage never converted his dreams into reality, because the standard of engineering and technology was not so high at that time.

Q.6 Define algorithm and expression.
A computer cannot solve a problem itself. In order to solve a problem, computer needs a set of instructions called Algorithm. An algorithm represents the logic of processing to be performed. There are two basic requirements to develop an algorithm.
(1) The instructions should be clear.
(2) The desired result should be output in a finite number of steps.

Q.7 Differentiate between RAM and ROM.
Difference between RAM and ROM



Q.8 Explain any three library functions.
Three library Functions
(i) ABS(X) Function
The ABS(X) function provides the absolute value of an input parameter. If X is greater than or equal to 0, ABS(X) will be equal to X. Alternatively, if X is less than 0, ABS(X) will be equal -1 times X.  t means that ABS(X) will result in the absolute value of X irrespective of the sign of X.

(ii) INT(X) Function
INT(X) is called the integer function. This function will print the greare st integer that is less than or equal to its argument.

(iii) SQR(X) Function
The SQR(X) function gives the square root of a number The value of the number inside the parentheses must be positive.

Q.9 Define unit of memory.
Units Of Memory
The memory measuring unit are as follows.
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 group of 4 bits is called Nibble. A nibble is also called a half byte. This is a non addressable unit of memory.
A byte is the smallest addressable unit of storage location, capable to accomodate the character. The characters may be an alphabet (a to z or A to Z), a numeral (0 to 9), or a special symbol (like! @ # $ % ” & etc). Usually a byte consists of 8 bits, while some micros have a byte of 16 bits or 32 bits. A byte is denoted by letter “B”.
Two consequent bytes (16 bits) are called a Word. This term is used in 8028 microprocessors.
Double Word:
Four consequent bytes (32 bits) are called double word. This term is used in 80386 and 80486 microprocessors.
Kilo Byte:
Kilo byte is a big unit of memory, generally represented by “KB”,which contains 1024 bytes.
Mega Bytes:
Mega byte is the largest unit of memory. It is represented by “MB”,which contains 1024 KB.
Giga Byte:
A new term giga byte has been introduced with the latest optical and laser storage systems. This is of course, a very very big unit of storage capacity. Since 1024 MB makes one giga byte (GB).
Tera Byte:
Another huge measuring unit is called tera byte. At the moment, it is not physically possible but logically the most modern computers can support this amount of memory. Hence 1024 giga bytes make one tera byte (TB).

Answer Question

Answer Question

Answer Question.

Answer Question.

Q.14 Define an operating system.
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.

Q.15 Define language translator.
Language Translalor
The computer does not understand a programming language, because computer only knows the machine language or binary language. A program must be translated into machine _ language before the machine can execute it. Software associated with programming languages includes language translators such as assemblers, interpreters and compilers.

Q.16 Explain C.P.U and write the name of its parts.
CPU and lIs ParIs
CPU stands for Central Processing Unit, which is the second main part of computer systems. It is divided into the following main parts.
(1) Control Unit (CU)
(2) Arithmetic and logic unit (ALU)
(3) Registers
(4) Memory Unit (MU)
CPU is also known as the brain of computer because the whole processing of data is done and controlled at CPU.


Q.17(a) What are the different types of computer? Explain each
of them With example.
Types of computers
There are three types of computers.
(1) Digital Computers
(2) Analogue Computers
(3) Hybrid Computers

(i) 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 data they receive from the user. All the personal computers belongs to this category, Digital computers can be classified into three groups.

(2) 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 controlling continuous process in industry or scientific research. The
accuracy of data used in Analogue Computer is directly related to the precision of its measurements.

(3) 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.

(b) Define flowchart and write the purpose, geometrical name
and symbols of the following:
Flow charts, graphically defines the solution of a problem, before a computer program is written for it. It is like a road map and reveals how each program is to be developed. It is graphical representation of a program to be programmed for machines/computers to produce the required output.

(i) Terminal
The terminal symbol, as the name implies is used to indicate a starting or stopping point in a flowchart

symbols and flowline

symbols and flowline



Q.18(a) Define Data and its types.
DATA: 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 mate rial 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

(i) 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 “D”.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, however 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

(b) Floating Point Data
Floating point data may include digits (0 – 9), decimal point, +/- sign and letters “D”, “d”, “E” or “e”.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 x 10-19 (Charge of electron in coulomb)
2.9979 x 108 (Velocity of light 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

(i) 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 10/B, Block No.2, E/03 etc.

(b) Graphical Data
It is possible that pictures, charts and maps can be treated as data. TIlt’ 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

(b) What is number system? Discuss different number systems.
Number System
The number system is the system of counting and calculation. Number system is based on some character called digits. Each number is made up of these characters. The number of digits system uses is called its base or radix. For example the number system we use in our daily life is called Decimal System. Its base is 10 (As the name “Deci” Implies) which means that it uses 10 digits (i,e, 0 – 9) .

Types of Number System
There are four types of number system used in computer operation.
(1) Decimal
(2) Binary
(3) Octal
(4) Hexa – decimal

(1) The Decimal Number System
Decimal number system is most familiar to us. We use this number system in our daily life for counting and calculations. In decimal we count in “Tens” using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 to represent a value. s:o the base of this system is 10. When a particular position overflows its maximum value (9) is recycled to zero after carrying one to the next left hand position.

The value that the digits represent depend on the weight or position they hold. The weights are based on the power of 10.

(2) The Binary System
The binary system is ideal for internal working of electronic computers. Computers circuitry represents data in a pattern by ON or OFF states of electric current because they are only tow states, they represented by 1 (for ON) and 0 (for off). Binary system is based on two fundamental digit 0 and 1 to represent its numeric values, therefore the base of this system is 2. The positional weights for the binary system are based on the power of z,

(3) The Octal System
Octal is a Latin word used for eight (8). Octal has eight fundamental digit as 0, 1~2. 3. 4. S, 6, 7 &0 the base of this system is 8. The weight of digit position are successive powers of 8.

(4) The Hexadecimal System
Hexadecimal means 16, therefore this is a base-16 number system. It has 16 fundamental digits. The first ten digits are same as decimal (0 – 9) and the rest of the six digits are the first six letters of English alphabets (A. B, C, 0, E and F). The letter A through F represents the decimal 10 through 15. This system is often used in programming as a shortcut to the binary number system. The weights used in the hexadecimal systems are the successive power of 16. .

Q..19 Write short note:
Software Packages
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.

(ii) Bytes
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 etc) 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”.

(iii) Abucus
The ABACUS is thousands of years old and used worldwide is most ancient of digital computer. The ABACUS was the first instrument that was used for helping men making calculations. ABACUS was developed in China around 3000 B.C and it was called “SWAN PAN”.

(iv) Mouse
Mouse is also a primary input device but lacks the ability to easily transmit it textual information. It is also called pointing device that is used to move a pointer on the computer screen in order to point to a place on a display screen and to select one or more actions to be taken from the position. .

(v) Plotter
Plotter is a special kind of output device that prints graphics on papers, which includes drawing, graphs, making maps, plotting engineeimg drawings and machine component. Plotters differ from printer in that they draw lines using a pen. As a result, they can produce continuous lines, where as printers can only simulate lines by printing a closely spaced series of dots.

(vi) Light pen
Light pen is a pointing input device that contains a photo
detector or light source, and that allows interaction with a
computer through a specially designed monitor. Generally, it is
used for engineering designing.

Posted on December 19, 2015 in 10th Class 2014 Karachi Board Past Papers

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