G.C.E. (A/L) Examination June 2015 Conducted by Field Work Center, Thondaimanaru.

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1 G.C.E. (A/L) Examination June 2015 Conducted by Field Work Center, Thondaimanaru. In Collaboration with the Zonal Education Office, Jaffna Information & Communication Technology (ICT) Grade - 13 (A/L) 2015 Part - II Time: 3 Hours Part II - A Structured Essay Answer all the questions (1) Consider the following scenario. Each supplier has a unique suppliernumber and name, and one or more suppliers may be in a city. Each part has a unique partnumber, partname and colour. A supplier may distribute more than one parts and a part may be distributed more than one distributed. A supplier distributes a specific quantity of parts. (a) Draw ER diagram. (b) Write down the relationship among entities whether it is one to one, one to many or many to many. [Justify your answer]. (c) Write down the table in the form of schema if the given ER diagram is mapped into possible tables. (d) Write down SQL statement to obtain names of suppliers who distribute more than 1000 quantity of parts. 1 [See page two

2 (2) (a) Consider the following web page rendered on a web browser. The following is an incomplete code to produce the above mentioned web page using HTML and CSS. < 1 > <head> <title> 2 </title> <style> #toptitle { text-align: center; font-size: 18pt; 3 : italic; }.paratext { font-size: 12pt; font-family: Arial; } < 4 > </head> <body> <div id="5"> Welcome to RoboEddy </div> <p class="6"> RoboEddy is an educational robot with the following features: </p> < 7 > <li> Fast microprocessor </li> <li> Two motor channels </li> <li> 8 analogue inputs </li> <li> 8 digital I/O ports </li> < 8 > </body> </html> 4 2 [See page three

3 Write down for labels given from 1 to 8 in the following table. Number Code / Tag (b) Assume a 2 20 byte memory. What are the lowest and highest addresses if memory is byte addressable? (c) Write down for WIMP using in Graphical User Interface (GUI) used in user interface design of software. W -. M -. I -. P -. (3) (a) Write down (16 10) and (-7 10) in one s complement method using 8-bits. (b) Find the value of (16 10) + (-7 10) using 8-bits one s complement method. 3 [See page four

4 (c) Four layers, protocols and devices of OSI reference model are given in the following table. Tick ( ) in the suitable boxes. Physical layer Application layer Transport layer Network layer (1) service (2) Routing (3) UDP (4) Hub (5) TCP (6) FTP (d) Write down the class, NetID and HostID of IP addresses given in the following table. IP address Class NetID HostID (1) (2) (3) (4) (a) Draw a flowchart to find whether a given number entered by the user is positive or negative number. 4 [See page five

5 (b) Write down a python program to find whether the given number by the user is positive number or negative number. (c) The following diagram shows the stages of Waterfall software process model in the order. Write down name of each stage A, B, C, D and E. A B C D E A -. B -. C -. D -. E -. 5 [See page six

6 (d) Consider the following scenario. A To Z is a company selling of clothing materials. A client purchasing clothing materials will get receipt and invoice copy bill by paying cash.. If payment was not received within two weeks, a reminder was issued. If another one week elapsed, then a final reminder was issued. Details about invoice are stored in invoice file. Reminder details are stored in reminder file. Itemized Bill M1 Itemized Bill (ii) (iii) 1 Receipt Details M2 Receipts (i) Receipt Copy Invoice (v) (iv) Manage Customer Accounts (vi) (vii) M3 (viii) Payment M4 Reminders Details M5 Payments Complete the following partial data flow diagram by identifying the missing elements. Write your answers in the table provided below. Label Appropriate Words (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) **** 6 [See page seven

7 (1) Part II - B Essay Questions Write down any four questions only Chemical process gives out a warning signal (W = 1) when the process operates incorrectly. A logic circuit is used to monitor the process and to determine whether W = 1. Input Binary values Process condition 1 Chemical rate = 20 litre / second A 0 Chemical rate < 20 litre / second 1 Temperature = 91 0 C B 0 Temperature > 91 0 C 1 Concentration > 5M C 0 Concentration = 5M A warning signal (W = 1) will be generated if: either Chemical rate < 20 litres /second or Temperature > 91ºC and Concentration > 5M or Chemical rate = 20 litres /second and Temperature > 91 (a) Write down the Boolean expression. (b) Draw the logic circuit, using only AND, OR and NOT gates, for the Boolean expression obtained in (a). (c) Construct a truth table for the Boolean expression obtained above in (a). (d) Obtain the Boolean expression, without simplification, in sum of product (SOP) form using truth table or other method. (2) Consider the following scenario. A popular private hospital situated in a city in Sri Lanka provides an e-health card for all of the patients getting treatment from it. This card would contain about his/her health related information in addition to each patient s identity information. This card is updated by doctors and the administration of the hospital each time as required when a patient goes to the hospital. Each doctor in the hospital has a card reader to read information about patient. (a) Write down three benefits that the hospital would obtain by providing this card to the patients. (b) Write down two benefits that the patients would obtain by using this card. (c) Write down a possible threat that the patients would face if unauthorized people is able to know the health related information of the patients. (d) Write down a technology that would be used in this card in order to reduce risk from getting health related information by unauthorized people if the patients lost their cards. (3) (a) Write down any two functions of data link layer of OSI network reference model. (b) IP address of a network is and its subnet mask is How many hosts may be connected in this network? (c) Write down short notes on the followings. (i) DNS Server (ii) Data encryption (d) Define the term agent in the context of agent technology and write down three situations with the help of example where agent technology is used. 7 [See page eight

8 (4) (a) Explain about three control structures used in computer programming with the help of flowchart segments. (b) Briefly explain what would happen by the interpreter when the following python program is executed. n = int (input("how many marks to sum?:")) total = 0 i =1 while i <= n: s = input ("Enter marks:") total = total+int (s) i = i+1 print (total) print (total/n) (c) What is the output of the following python program? def order(word): i = 0 j = len (word)-1 while i < j: if word[i]!= word[j]: return False i = i+1 j = j-1 return True print (order("ada")) (5) The following scenario describes the data requirements for a video rental company. The company has several branches throughout the country. The data held on each branch is the branch address and the telephone number. Each branch is given a branch number, which is unique throughout the company. Each branch is allocated staff, which includes a Manager. The Manager is responsible for the day-to-day running of a given branch. The data held on a member of staff is his or her name, position, and salary. Each member of staff is given a staff number (staffno), which is unique throughout the company. Each branch has a stock of videos. The data held on a video is the video number (videono), title, category and the names of the main actor and the director. The videono uniquely identifies each video. There are several copies of each video at a branch, and the individual copies are identified using the copy number (copyno). A video is given a category such as Action, Adult, Children, Drama, Horror, or Fiction. Before hiring a video from the company, a customer must first register as a member of a local branch. The data held on a member is the name and the date that the member registered at a branch. Each member is given a member number (memberno), which is unique throughout all branches of the company. Once registered, a member is free to rent videos, up to a maximum of ten at any one time. The data held on each video rented is the rental number, and the dates the video is rented out and returned. The rental number is unique throughout the company. Construct a single ER diagram for the above mentioned scenario and identify attributes and associate them with entity or relationship types and mark primary key attributes for each entities. State any assumptions necessary to support your design. 8 [See page nine

9 (6) Consider the following scenario. It is planning to provide new e-identity card for all the citizens above 15 years old by the department for registration of person in Sri Lanka. A person s photo, finger print, bio-data and blood group would be stored in this identity card. A computerized system has to be developed for this purpose. It is expected to be used this system by the office of the department for registration of person in each districts. Photo and finger print shall be able to take in this system. A citizen will give all the details by going to the office of the department for registration of person. The department for registration of person decides of the necessity to protect all of the information given by the citizens from unauthorized people. Further, all other necessary information about person are stored inside a chip embedded on an identity card. These information are invisible on the identity card. (a) What is functional requirement? (b) Write down two functional requirements of this system. (c) State two possible advantages that the department for registration of person would obtain by introducing this new electronic identity card. (d) Except the chip technology, write down two card technologies that would be used for data storage, machine reading and information encoding. **** 9 [End

G.C.E. (A/L) Examination July 2016 Conducted by Field Work Center, Thondaimanaru

G.C.E. (A/L) Examination July 2016 Conducted by Field Work Center, Thondaimanaru In Collaboration with the Zonal Education Office, Jaffna Information & Communication Technology (ICT) Grade - 12 (A/L) 2017