Computer Studies (general group) Solved Past Paper 10th Class 2011 Karachi Board


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

solved M.C.Qs Computer studies 2011 general group

solved M.C.Qs Computer studies 2011 general group

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Q.14 Define Monitor and describe its types?




Basic Types of Monitor

The two basic types of monitors arc:
(1) CRT monitors which is similar to the television screen and also work in the same way. It uses a large vacuum tube called Cathode Ray Tube (CRT).
(2) Flat panel display (Liquid Crystal Display or LCD) which is usually used with portable computers but now have become very popular with the desktop computers too

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Trade Ball

A track ball is a pointing device that looks like upside-down mouse. The function of track ball is same as of mouse but you do not have to roll it over a flat surface. You use a track ball by rolling the ball with your palm or fingers in the direction you want the pointer to go. There are usually one to three buttons next to the ball, which are used just like mouse buttons.
printers and running user programs.
(b) Define each of them in detail:
Floppy Disk

Floppy disk is a small removable, portable storage device that is made of polyester film coated with a metal oxide compound. It looks like a 45 rpm phonograph record except that it is enclosed in a jacked square in shape. It is readable by a computer with a floppy disk.


The physical size of disk has shrunk from the early 8 inch to 5.25 inch square and about 1 millimeter thick (“Mini-floppy”) to ~.5 inch square and about 2 millimeters thick (“Microfloppy’) while the data capacity has risen.

Format of Diskettes

The following format is used on IBM PCs and elsewhere

Two heads, one on each side of a disk, read or write the data as the disk spins’. Each read or write operation requires that data be located, which is an operation called a “seek”


This pari of CPU is capable of performing arithmetic and log. operations. It performs the arithmetic operations such as addition, subtraction, multiplication and division. It can also perform logical operations like comparing two numbers [0 see which number is greater than, less than or equal to another number.
The AlU performs millions of calculations and comparisons at a very
high speed.


This pan of CPU monitors and complete computer system, It docs not execute the instructions itself, it directs other parts of the computer system to In words it controls the flow of data inside the computer

(b) write down the advantages of 1st and 2nd Generation Computer

Advantages Of First Generation Of Computer

(1) Vaccum tubes were used a as electronic component.
(2) Electronic digital computer were developed for the ‘first time.
(3) These computers were the fastest calculating devices of their time. .
(4) Computations were performed in milisccond.

Advantages Of Second Generation Of Computer

(L) Smaller iil size as compare to I st generation.
(2) More reliable than previous.
(3) Less heat generated.
(4) Faster processing speed
(5) Less hardware and maintenance problem.
(6) Could be used for commercial use.
(7) Transistors were used in place of vacuum tubes

Q.18(a)What is an Operating System? Discuss its importance.

Operating System


Operating system is a set of programs that controls and supervises the hardware of a computer and provides services to application software, programmers and users of computers

Importance of Operating System

(1) Without an operating system computer cannot do anything useful.
(2) Without an operating system computer cannot recognize any command.
(3) Any operating system acts an intermediary between the user of a computer and the computer hardware.
(4) The primary goal of an operating system is to make the

capacity dencity width

capacity dencity width

Double density and high density are usually ab reviated DD and HD


Q.17(a)Draw the diagram of Computer System. Define Control Unit (CU) and Arithmetic Logic Unit (ALU)?

Diagram Of Computer System;

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.

Block diagram of CPU

Block diagram of CPU

Hard Disk:

A hard disk is a magnetic disk on which you can store data. It is a fixed storage media, although it is possible to buy removable hard disks. The term ‘hard’ is used to distinguish it from Ii soft or floppy disk. Hard disks contain several billion bytes (giga bytes) of storage in today’s computer. Hard disks are rigid aluminium or glass disks about 3.5″ in diameter in a personal computer and smaller in laptop. They are ferromagnetic material and a read/write head transfers data, to it magnetically. A hard disk is really a set of stacked “disks”. The surface of each disk is divided into a number of evenly spaced concentric circular tracks. The set of all tracks at a given radius on all surface are known as . cylinder. Each track is divided into sectors


Each of disks, like phonograph records, has data recorded electro magnetically in concentric circles or “tracks” on the disk. A “head” (something like a phonograph arm but in a relatively fixed position) records (wires) or reads the information on the tracks .

Magnetic Tape:

A magnetic tape is a storage device from which you can  access data serially like an audio cassette from which you can hear the songs in the order in which they are stored. Serial access is slower than the direct access provided by media such as diskettes. When you want to access some particular data from the tape, the device has to scan through all the data you do not need but the data is stored before the required one. The access speed can be quite slow when the tape is long and what: you want is not near the start. So the best use of the magnetic tape is for the data that you do not use very often

Q.19(a)Describe Keyboard and its divisions in detail.


In most computers, a key board .s the primary text input device. It consists of a set of keys for computer input, which uses the same key’ arrangements all the mechanical and electronic typeWI;’~: Keyboards that produced the computer but with a few extra Ley’ for computer commands and usually .with the addition of a numeric keypad. The standard arrangement of alphabetic keys is know asxhe Q.WERTY(Pronounced KWEHR-TEE) keyboard. The name is derived from the arrangement of five keys at the left of upper first row of alphabetic keys

A standard key board includes about 100 keys and each key send a different signal tv the CPU keyboards ~or p~rso~:!l computers that co:ne in many different styles that differ in SIze, number of keys and shape

Division Of Keyboard:

Alphanumeric Keypad:

This is the main part of keyboard by using this keypad the letters a-z , A-Z, numbers 0-9 and special characters like !#$%/_+ etc may be typed: Many of these characcers are typed ~y holding shift key. Any type of data can be entered through this keyboard

Numeric Keypad:

Numeric Keypad rsually placed on the right hand side of the key board that iooks like a simple calculator which includes number keys from 0 to ~ digits, the four basic operation (+, -, *, r), decimal- point and ~-l’.lmLoci; key that works similar to Caps Lock, to force the numeric keys to input numbers

Function Keyboard:

In-the enhanced Keyboard, a set of twelve (keys me as FI to F12) is located at the (01′ of the keyboards this function keypad is located’ on the left with only ten keys. All of these keys have pre-defined meanings which depend on the application software

Screen Navigation or Cursor Movement Keys:

In many programs there is a blinking mark on the screen where the key you press will display a particular character/digit/Special character. This mark called cursor, appears indifferent shapes in various programs, a solid small box, a vertical line etc. cursor control keys are used to move the cursor around the screen. Most keyboards include the following Cursor Movement Keys

(i) Arrow Keys
(ii) Home and End
(iii) Page up and page Down

Modifier Keys:

These keys are used to modify the input of other keys. YOt;:: press another key while holding down one of the modifier keys, shift, ctrl, alt are same examples of modifier keys.
(i) Delete Keys
(ii) Insert key
(iii) Esc Key
(iv) Print Screen Keys

(b) What are main step involved in the solution of program.

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Posted on December 23, 2015 in 10th Class 2011 Karachi Board Past Papers

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