sessional csc 401

8/11/2019 Sessional CSC 401

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COMSATS Institute of Information TechnologyVirtual Campus

FIRST SESSIONALEXAMINATIONFALL2014

TOTAL MARKS: 10

Student Name:Muhammad Imran Irshsad

Registration No: CIIT/________________/CVC

!OM"#TIN$FORMANA$EMENT

!S!401

Instru%tions &or attem'ting 'a'er:

1. Submission through LMS is mandatory.

2. No late submissions would be a!nowledged in any ase.

". Co#ied #a#ers will be mar!ed $ero.

Attem't a(( )uestions.

%age 1o& *


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+uestion No 1'rite a short note on Sholes and (lidden )ey board* +ow ,-ora! hanged his idea* ,-.

+uestion No 2 #ress with diagram the &untioning o& !eyboard. ,2.

+uestion No - %er&orm a om#arison between roll ball and o#tial mouse* ,2.

+uestion No 4 'rite a note on monitor and its ty#es. ,-.

%age 2o& *


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0irst o& all it is im#ortant to desribe about the in-entors.

!/risto'/er Lat/am S/o(es 0ebruary 13 1415 6 0ebruary 17 14589 was an :merian in-entorwho

in-ented the &irst #ratial ty#ewriterand the ;'


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Dvorak is an alternative to Qwerty. It is a keyboard layout designed to minimize movement, and make

typing as easy and painless as possible. The idea behind it is to have the most commonly typed keys

under the ngers, and make it as easy as possible to type common words and combinations o! letters.

To give an impressions o! "ust how big a di#erence this makes, consider that the average Dvorak typist$s

ngers will travel about one mile in a day o! typing. % Qwerty typist$s will travel anything !rom &' to ()miles. Try to consider, !or a moment, the e#ect that must have on your ngers.

Dvorak is easy to pick up, taking about hal! as long as Qwerty. That is little com!ort to those who are

already !amiliar with Qwerty, as it means starting over. *owever, the benets certainly make it worth

spending a couple o! weeks learning to type all over again. +or many o! us, that is actually a benet,

since many computer users never learned to type properly in the rst place.

An optical or laser mouse, in most cases, works as well or better than an older rollerball mouse, often called a

mechanical mouse. But in certain situations rollerball mice have advantages over their newer counterparts. Whencost is a primary issue, or when working on specific surfaces, rollerball mice still outperform other devices.

Sur&aes

While optical mice work on many surfaces, they often do not track properly on glass or smoothmirrored surfaces. This problem stems from the way optical mice use imperfections in a surface to readmovement, and the tendency for the mouse's light to pass through glass rather than rebound back. If

%age 4o& *


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you wish to use a mouse on a particularly smooth or transparent surface, a rollerball mouse will resultin better movement detection.

%rie

While mouse technology continues to lower in overall price, rollerball mice are usually available

for considerably less than optical mouse equivalents. Users looking for cheap, functional mice canusually find rollerball devices for only a few dollars.

Com#atibility

ince many rollerball mice were constructed for use with older systems, they more often use the!"# port for connection. If you have an older system without U$ compatibility, or a system withlimited U$ access, a rollerball mouse will offer compatibility with the older connection technology. %simple !"# to U$ adapter will make an older rollerball mouse compatible with nearly any moderncomputer system as well.

sessional csc 401

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