Briefing Session on 2013 HKDSE ICT Exam. 22/23 Nov 2013

Transcription

1 Briefing Session on 2013 HKDSE ICT Exam 22/23 Nov

2 Breakdown of elective No. of candidates No. of schools 1 7, A B C 5, D 1,

3 Options offered No. of options No. of schools

4 Popularity Combination No. of schools C 314 D 64 A 39 CD 31 4

5 Interesting Figures (1) Paper Max Mark A 54 2B 49 2C 48 2D 55 5

6 Interesting Figures (2) Selection of Prog Lang (2D) Total % Pascal C Visual Basic Java ,

7 Performance Compulsory Part Average no. of MC items correct = 23 High correlation with Paper 2s and SBA 7

8 Performance Elective Part Equating performance of candidates (Elective Part) can be reflected on the same scale (Equipercentile method ) Performance (Paper 1) of students in 2D > 2A > 2B > 2C Refer to Grading Procedures & standards-referenced Reporting in the HKDSE Exam (HKEAA) 8

9 Grading Procedures Sample script selection Standardisation Post-marking exercise Panel of judges grading meeting Internal meeting Public Exam Board meeting Refer to Grading Procedures & standards-referenced Reporting in the HKDSE Exam (HKEAA) 9

10 ICT (All candidates) Level % 5** 0.7 5*

11 Levels attained HKDSE Level 4 comparable to HKAL Grade D L5** Top 10% of L5 L5*+ Top 40% of L5 (L5* = next 30%) 11

12 SBA No major irregularity cases 12

13 SBA Reminders Students have to complete their reports on their own acknowledge sources properly in their work to avoid plagiarism New measures: Prevention & handling of Malpractice 13

14 2013 ICT Exemplars Exemplars with annotated notes P1B 1 language P2 selected levels Uploaded to 14

15 Assessing Student Learning for the ICT Curriculum Briefing Session on 2013 HKDSE ICT Examination [ 1B & 2B ]

16 Paper 1B Qu 1 ~ (a) (i) John connects the printer to the network at P instead of Q. What is the advantage and disadvantage of this? Adv : easy to control Disadv : can be used only when the desktop computer is on Student Performance : OK

17 Paper 1B Qu 1 ~ (a) (ii) The printer is equipped with RAM and ROM. When John prints a document, what will the RAM and ROM store? Student Performance : RAM: print data ROM: printer s firmware OK, some not know printer has RAM and ROM, and their functions Reflection for T&L: RAM & ROM are generic main storage, not only for computer

18 Paper 1B Qu 1 ~ (b) (i) Suggest two possible ways to link up the desktop computer and the smartphone. Student Performance : Good WiFi network Bluetooth USB cable

19 Paper 1B Qu 1 ~ (b) (ii) X and Z are two different cables. What is the major difference in functional characteristic between them? Student Performance : data transfer rate Max. length cable segment Not good, some talk about analog and digital signal Reflection for T&L: Teach student what is the meaning of functional characteristics

20 Paper 1B Qu 1 ~ (c) The rear part of the router is shown in the diagram below. Mark X and Y on the diagram to indicate where the cables X and Y should be connected. X LAN Y WAN

21 Paper 1B Qu 1 ~ (d) Someone suggests that John build a Domain Name System (DNS) to improve his network services. John disagrees with this suggestion. (i) What network service does a DNS mainly provide? (ii) Do you agree with John s view? Explain briefly. (i) DNS resolves domain names into IP (ii) He does not need DNS because it is just a LAN Student Performance :Good

22 Paper 1B Qu 2 ~ (a) Janice is planning the annual Charity Run for her school. She uses graphics software to create a map with the route of the Charity Run and posts it on the school s web site. Janice decides to store the map as MAP.JPG instead of MAP.BMP. Give one benefit of her decision. smaller file size/ supported by many browsers Student Performance :Good

23 Paper 1B Qu 2 ~ (b) Suggest two protocols for receiving that Janice may use POP3, IMAP Janice finds that the client program classifies Alan s as spam. What does she need to do to prevent this happening again? Add his address in non-spam list Janice tries to reply to all the accounts involved Student Performance :Good Alan and Betty

24 Paper 1B Qu 2 ~ (c) The notebook computer is equipped with a solidstate drive (SSD) instead of a general hard disk. Give two benefits to Janice of using a SSD. higher data transfer rate. consumes less electricity. smaller in size. better shock resistance. Lighter more durable. Student Performance : Good

25 Paper 1B Qu 2 ~ (c) Janice uploads the videos and pictures to the school s web site and the web site includes a statement All rights reserved. If the statement were removed, would the school own the copyright of the web site? Explain briefly. Yes, copyright ownership does not require any registration or declaration.

26 Paper 1B Qu 2 ~ (d) (i) To promote the Charity Run, Janice writes an article in the school newsletter and inserts the following code for linking to the school s web site. Give one advantage of using this code over a bar code. store more data. a higher error correction capability. can be scanned in different orientation. be made up of more types of data Student Performance : OK, but some show no experience in it Reflection for T&L: More actual demo to student

27 Paper 1B Qu 2 ~ (d) (ii) What is the benefit of using this code in the school newsletter? faster to input the URL reduce typing errors Student Performance : OK, but some of the answer are too simple (e.g. convenience) Reflection for T&L: More concrete answer, higher level questioning at lessons

28 Paper 1B Qu 2 ~ (d) (iii) Describe another kind of use of this code. Student Performance : Good phone number / product information.

29 Paper 1B Qu 3 Amy, Billy and Charles work in different offices in a company. Read their conversation about using computers and answer the questions below. Amy: Charles, your office does not have a good ergonomic environment. Billy: Charles, you have installed a Bit Torrent (BT) program on your computer. You should delete it. Charles: No, I will still keep the BT program and use it. Amy: Charles, we installed the same anti-virus software at the same time but only your computer is infected.

30 Paper 1B Qu 3 ~ (a) Give two possible features of the setup of Charles office that could easily lead to eye strain when using the computer. improper viewing angle of the monitor / improper height of the monitor / distance from the monitor to his eyes too close / insufficient light / close to the window without curtain Student Performance : Good, but some state features not related to set-up, or not related to eye strain Reflection for T&L: Care about EVERY word in the question

31 Paper 1B Qu 3 ~ (b) Billy and Charles have different views on the use of the BT program. (i) Give a reason to support Billy s recommendation. (ii) Give a reason to support Charles decision. (i) Charles would download some software that the sources come from unidentified individual users; the software might be privacy copies. (ii) Charles can share working files with other colleagues efficiently. Student Performance :OK, but some student think BT is fast / illegal / virus Reflection for T&L: Clear general misconception of their usual experience

32 Paper 1B Qu 3 ~ (c) Why is only Charles computer infected? Give two possible reasons. Student Performance : infected with new computer virus deactivates his anti-virus software. does not regularly update the definition database of the anti-virus software. Good, but some state their Anti-virus software are different Reflection for T&L: Care about EVERY word in the question

33 Paper 1B Qu 3 Charles: The operating system of my computer uses Unicode instead of Big-5 code and GB code. Billy: Unicode only includes around 20,000 Chinese characters. Amy: Not any more. As of September 2012, Unicode includes more than 110,000 characters.

34 Paper 1B Qu 3 ~ (d) (ii) Referring to Amy s comment, do the 110,000 characters include traditional and simplified Chinese characters only? Explain briefly. Other than the Chinese characters, there are characters of other languages Student Performance : Good, but some mentioned the following only Number Character English character Reflection for T&L: State more related examples

35 Paper 1B Qu 3 ~ (d) (i) To represent a set of 20,000 characters using binary code, what is the minimum number of bits required? Show your calculation < 20,000 < bits are needed. Student Performance : Good

36 Paper 1B Qu 3 ~ (d) (ii) Referring to Amy s comment, do the 110,000 characters include traditional and simplified Chinese characters only? Explain briefly. Other than the Chinese characters, there are characters of other languages Student Performance : Good, but some mentioned the following only Number Character English character Reflection for T&L: State more related examples

37 Paper 1B Qu 3 Amy, Billy and Charles go to a public library and want to use workstations. Amy: There is an empty seat but the workstation has not been logged out. Charles: The account has not been logged out. There is a coupon attached to the . Let me print it so we can use it. Billy: The security of the workstations is very low. Secure Sockets Layer (SSL) should be used.

38 Paper 1B Qu 3 ~ (e) (i) Describe two illegal offences that Charles would do if he accessed the and printed the coupon. Student Performance : He accesses the account without authorization. He steals the coupon. Good, especially in THEFT offences. But some mentioned privacy instead of illegal access Reflection for T&L: A good example to show illegal access vs privacy

39 Paper 1B Qu 3 ~ (e) (ii) Can SSL prevent Charles from accessing the account mentioned above? Explain briefly. Student Performance : No, SSL is used to secure the data transmission. (encryption) Good, except some only mentioned more secure, which is not acceptable Reflection for T&L: Don t simply repeat wordings in the question

40 Paper 1B Qu 4 Sarah is a librarian in a secondary school. She uses a table in a database, LOAN, to store the book circulation records.

41 Paper 1B Qu 4 ~ (a) Suggest a primary key for LOAN. Suggest a validation check on each of the following fields. Student Performance : Good, except some not using question example for answer reference Reflection for T&L: Give explanation with reference to question scenario

42 Paper 1B Qu 4 ~ (b) Sarah executes a SQL command on LOAN with four records, as shown below. SELECT STUID, COUNT(*) FROM LOAN GROUP BY STUID Student Performance : Good

43 Paper 1B Qu 4 ~ (c) Sarah wants to send a reminder to the students whose fines total more than $10. She uses column E to store Y if the is needed, and N otherwise. She enters a formula into E2 and then copies it to the other cells in column E. Write the formula in E2.Suggest a validation check on each of the following fields. Sarah enters the following formula into H3 and then copies it into H4:H5 so as to calculate the sum of all fines in each form. =SUMIF(C2:C160,$G$3, $D$2:$D$160) Student Performance : Poor, especially in Relative & Absolute Addressing Reflection for T&L: More effort on Excel Addressing

44 Paper 1B Qu 4 ~ (d) Sarah copies the worksheet into a document in a word processor by creating a dynamic link. For each of the following actions, is there any change in the worksheet? If yes, describe the change Student Performance : Good

45 Paper 1B Qu 4 ~ (e) Sarah creates a presentation file with hyperlinks and multimedia elements and posts it on the school s web site. A student downloads and opens the file. He finds some technical problems regarding the hyperlinks and multimedia elements. Describe two possible technical problems. Student Performance : Good

46 Paper 1B Qu 5 ~ (a) Student Performance : Good, student understand need of initialization, and some basic operation

47 Paper 1B Qu 5 ~ (a) Student Performance : Not good, some student not good in explaining change Reflection for T&L: More practice in describing change

48 Paper 1B Qu 5 ~ (c) In this sales promotion, ALG3 is used to calculate the actual payment, PAYMENT, for Mary. ALG3 includes ALG1 and ALG2. Complete ALG3. Student Performance : OK, but some not good in subprogram / modularizing the program Reflection for T&L: More practice in subprogram / modularizing the program

49 Paper 1B Qu 5 ~ (d) The department store has another sales promotion. The 20 members with the highest total spending each month can enjoy 20% off all year round. A computer application system is used to find these 20 members. Should the system be a single-user system or a multi-user system? Explain briefly. Should the system be a batch processing system or a real-time system? Explain briefly. Student Performance : Good

50 Briefing Session on 2013 HKDSE ICT Exam Paper 2A

51 Question 1

52 Question 1 Candidate Performance : (a) Very Good. (b) Satisfactory. (c) Satisfactory. Most candidates are able to manage simple SQL statements involving filtering, ordering and grouping. * Accept grouping field(s) is/are not the same as the field(s) in the select clause. * Accept TRUE, TRUE, TRUE and.t. to represent boolean data type.

53 Question 1 Candidate Performance : (d) Fair. (e) (i) Fair. (ii) Poor. (d) Some candidates cannot handle this more complicated SQL statement. Some of them cannot distinguish the usage of where clause and having clause and put aggregate function in the where clause. * Not Accept YEAR( ) = 2012 since the return of the function YEAR() is an integer. (e)(i) Some candidates directly explain the working flow of this SQL statement, but cannot show the background purpose of it. (e)(ii) Many candidates don t know how to use outer join. *Accept left outer join and left join *Not accept = NULL

54 Question 1 Candidate Performance : (e) (iii) Poor. Only a few candidates can answer MINUS / EXCEPT. Some candidates understand this question is asking for combining two SQL statements, but they only know the word UNION.

55 Question 2 Candidate Performance : (a) Fair. Some candidates don t know how to determine which is foreign key.

56 Question 2 Candidate Performance : (b) Poor. Many candidates don t know the usage of data dictionary.

57 Question 2 Candidate Performance : (c) Satisfactory Many candidates don t know why SQL View can be used to protect the data privacy.

58 Question 2 Candidate Performance : (d) Satisfactory (i) Most candidates can explain the problem, but they don t know the term referential integrity and the concept related to foreign key.

59 Question 3 Candidate Performance : Fair This is a very traditional question, but some candidates still don t understand the difference of usage between database and spreadsheet

60 Question 3 Candidate Performance : (b) Excellent Some candidate are weak at data representation, e.g. use 888 for an integer. * Accept , , 20/03/2013,#20/03/2013#,{20/03/2013} and * Not Accept 20/03/2013,

61 Question 3 Candidate Performance : (c) Satisfactory Many candidates know this suggestion can reduce the required storage size, but not many of them can answer the potential disadvantage with the concept of data validation.

62 Question 3 Candidate Performance : (d) Fair Most candidates don t know what should be done before data migration.

63 Question 4 Candidate Performance : (a) Good. Some candidates cannot identify the job title. Some candidates wrongly think programmer is responsible for designing the conceptual database schema.

64 Question 4 Candidate Performance : (b) Good * Get 1 mark when one of the entities is correct * Get 1 mark when one of the relationship is correct * Get 1 mark when one of the cardinality is correct

65 Question 4 Candidate Performance : (c) Satisfactory Many candidates can answer both advantage and disadvantage of the combination.

66 Question 4

67 Question 4 Candidate Performance : (d) Satisfactory (i) Most candidates know that the system should not disclose the name of buyers. (ii) Some candidates only concentrate on the ordering and don t know the provide proper information means to protect data privacy. MID should not be selected.

68 Question 4 Candidate Performance : (e) Satisfactory The majority of the candidates can answer correct subquery. (f) Fair Many candidates can answer this question.

69 Paper 2B Qu 1

70 Paper 2B Qu 1 (a) What does the value 80 after the colon in the URL mean? Network mask: Default gateway: Student Performance : Good, except some wrote 埠 wrongly Reflection for T&L: More practice in keywords

71 Paper 2B Qu 1 (b) function of the gateway benefit to Vicky of enabling VPN DHCP is used in the network. How does this help the network connection Student Performance : Poor, especially in VPN and DHCP. Some wrote their definition but not benefit Reflection for T&L: Clear concept between difference of definition vs advantage in using

72 Paper 2B Qu 1 (c) Suggest two changes in the settings of the router which would improve the security Vicky finds that the tablet computer is out of order. She buys a new one which is of the same model and uses the same settings as the old one. However she cannot connect it to the WiFi network. Why? What change in the settings of the router should she make? Student Performance : Good, knowing MAC is unique

73 Paper 2B Qu 1 (d) Vicky enables automatic channel selection instead of the fixed channels for the router. Why? Student Performance : Poor, most simply mentioned the benefit is automatics Reflection for T&L: Don t simply repeat wordings in the question

74 Paper 2B Qu 1 (e) Vicky has a notebook computer. The network supports wired and wireless connections. Vicky decides to use the wired connection for the notebook computer. Apart from bandwidth, suggest and describe two reasons to support her decision. Student Performance : Good

75 Paper 2B Qu 2

76 Paper 2B Qu 2 (a) Give an example of the analog data. Give an example of the digital data. Where does the conversion from analog data to digital data take place? Where does the conversion from digital data to analog data take place? Student Performance : Good

77 Paper 2B Qu 2 (b) Briefly describe the data flow in these cameras to illustrate the simplex mode. The security system uses synchronous transmission. Give one advantage and one disadvantage of using synchronous transmission. Student Performance : Poor, cannot well describe Reflection for T&L: Concept is simple, need more practice in describe

78 Paper 2B Qu 2 (c) Data captured by the cameras is stored on the server. Optical fibre instead of CAT5 cable is used for the new cameras but the network throughput does not improve. Give two upgrade suggestions for improving the network throughput Briefly describe the data flow in the new IP cameras, to illustrate the duplex mode. Student Performance : Good

79 Paper 2B Qu 2 (d) In each of the following cases, which protocol, UDP or TCP, should be used? Explain briefly. The visual images are sent to a server for storage. Security officers can instantly view the visual images of the lobby. Student Performance : Poor, cannot well describe Reflection for T&L: Need more practice in describe

80 Paper 2B Qu 3

81 Paper 2B Qu 3 (a) Describe two network tests that Mr Chan has to do during the testing stage. The museum plans to allow visitors to use their own mobile devices. Give two considerations that the museum should bear in mind before implementing this plan. Student Performance : Good, students show good ability in design test plan if objectives are clear For museum consideration, students answers are too technical

82 Paper 2B Qu 3 (b) One day, four APs are out of order. Problem encounter Relocation? Student Performance : Good

83 Paper 2B Qu 3 (c) An IT company will donate as many as APs Mr Chan wants. Someone suggests that Mr Chan should mount more APs, for example, one AP every 5 m2. Give two disadvantages of this suggestion Student Performance : Good, except some wrote need budget to buy Reflection for T&L: Care about EVERY word in the question

84 Paper 2B Qu 3 (d) Mr Chan needs to install Y instead of network cables for connecting X1 and X2 to the server. Give one reason to explain why network cables should not be used. What major task will X1 perform when interacting with the other five APs in the hall? Student Performance : Good

85 Paper 2B Qu 4

86 Paper 2B Qu 4 (a) Patients medical data is sent from the server to doctors messaging devices through the hospital s WiFi network instead of the public mobile network. Give two reasons to support the use of the WiFi network. Student Performance : Good

87 Paper 2B Qu 4 (b) Patients medical data collected from the medical sensors is sent to doctors messaging devices via the server. What are the major functions of the server regarding network management? Give two examples. Student Performance : Good

88 Paper 2B Qu 4 (c) Packet switching is used for the data transmission between the server and doctors messaging devices. Circuit switching should not be used in this case. Why not? Describe the packet switching mechanism for the data transmission. Student Performance : Poor, cannot well describe, and also not clear in packet vs circuit switching Reflection for T&L: Need more practice in describe, and more teaching in packet vs circuit switching

89 Paper 2B Qu 4 (d) The network design uses Cloud storage, that is, online storage managed by third parties through the Internet. Give two benefits of using Cloud storage Give two potential problems of using Cloud storage. Student Performance : Good

90 Paper 2B Qu 4 (e) The bedside device is a mobile device which allows a patient to move around the hospital with the device. It forms a personal area network (PAN) with medical sensors for communication, as shown below. Student Performance : Poor, student not have good knowledge in PAN Reflection for T&L: Need more teaching in PAN

91 2013 ICT Paper 2C

92 毋須安裝 / 可利用瀏覽器觀看電影 / 跨平台 ( 附註解 ) 下載 串流傳輸 網上觀看 容易發放更新版本 / 跨平台 ( 附註解 ) 有效管理客戶或電影記錄 / 防止電影被下載

93 兼容很多常用視像放器 / 毋須額外 Codec / 質量較佳 ( 需要較少壓縮 ) 毋須 Codec 檔案較大 / 不支援串流傳輸

94 較短等候時間 節省時間 ( 硬件 ) 圖形顯示卡的運算能力差 / 沒有足夠記憶體 沒有更新 不夠好 ( 網絡 ) 顧客電腦的網絡頻寬不足 / 伺服器因繁忙未及回應 / 網絡十分繁忙

95 / 200 或 60 8 / 200 = bit/s 或 2.4 Mbps (2.5Mbps)

96 MP4 / MKV / AVI (H264, AVCHD) / WMV / FLV / MOV (, ) codec, FFmpeg, DivX, Xvid, x264, mpeg

97 每秒掃瞄行數 ( 高度 ) 解像度 每秒掃瞄像素數目 / 幀數目 像素寬度 在逐行視像中, 幀內所有行線逐行更新 逐行更新 在交錯視像中, 幀內所有行線隔行更新 一個一個 ( 層 ) 改變

98 Q.2 是 否 是 是 否 否

99

100 這兩個瀏覽器對某些 HTML 編碼的翻譯不同 / 這兩個瀏覽器於墊或邊界的設定不同 表格 / 幀 (frame) / CSS / 圖像 / 層面 (layer) (, )

101 搜尋器加入搜尋索引時採用這些數據 / 彼得打算增加被搜尋器搜尋得到的機會 / 定義字符編碼格式 網頁 / 關鍵字 / 標題 / 作者 / 版權 / 產生日期 / 字符編碼 / 網頁更新 / 轉發 (, ) ( 附描述 ) ( 其他可行用途 )

102 位元 = 51 / 51.3 / MB 幀速率 / 解像度 / 檔案格式 / 過渡效果 / 音效 / 字幕 (,, )

103 HKDSE ICT Paper 2C Q.3-4

104 防止傀儡程式讀取這些文字 / 確保這項回應是由真人發出 / 防止註冊或輸入資料由軟件自動產生 ( 防止點客攻擊 / 防止複製及貼上 )

105 它可由布拉耶 / 布萊葉閱讀器 / 讀屏軟件讀取 ( 盲人可使用替換文字 ) 透過聲效讀出驗證碼內容 ( 聲效驗證 )

106 ( 電腦 / 瀏覽器 ) 向用戶名稱 ( 或其他輸入欄 ) 採用客戶端手稿程式 ( 本機 / JavaScript),(1) 以檢測其輸入是否空白 (+1) 向用戶名稱 ( 或其他輸入欄 ) 採用伺服器端手稿程式 ( 數據庫 ), (1) 以檢驗客戶的真確性 / 使用者名稱與密碼是否有效 (+1)

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108 缺點 1: 用戶可沒有正確輸入歌曲的代碼 (1) 方案 1: 當按下表單上的歌曲時將代碼自動加入 / 在每一行歌上加入一個 加入購物籃 按鈕 / 在歌曲側加入一個複選框 (+1) ( 利用下拉式選單 ) 缺點 2: 用戶所揀選的歌曲沒有顯示, 他不能刪除或修改 / 用戶未能檢視所選購的歌曲 (1) 方案 2: 加入一個表格來展示所揀選的歌曲, 並容許作任何修改 (+1) ( 加入一個重設 / 復原按鈕 ) 其他可行答案 : 歌曲不是順序排列 (1) 加入一項排序功能 / 搜尋功能 (+1)

109 ( 缺點 : 用戶每次只可輸入一個代碼 / 該文字欄太短 / 繼續購買 按鈕沒有用處 / 用戶每次只可購買一首歌曲 / 不能自動運算總金額 只有歌曲名稱, 不清楚由那個歌手唱 方案 : 加入一個數量欄 / 加入一個歌手欄 / 加入試聽連結 )

110 在一秒內取出 44,100 個樣本 ( ) 每個樣本由 16 個位元數據組成 / 每個樣本大小為 16 個位元 它可產生從四方收集的聲音, 如自然發出的聲音, 富人性化 / 利用兩個聲道 ( 左右兩邊 ) 收錄聲音 可播放出栩栩如生的歌曲 / 錄播的歌曲接近真人現場演唱 ( 質量較佳 / 聲音佳 / 清晰地收錄聲音 / 有兩道聲道 )

111 相位 phase 振幅 Amplitude / 聲量 loudness / volume ( 檔案類型 / 檔案格式 / 壓縮方法 / 時段 / 長度 )

112

113 有一些活動的名稱冗長, 它們可清楚地展示出來 / 寬度 / 顯示面積較細, 適合於手提電話 / 流動裝置使用 (2) 當有很多不同活動時, 此項設計可固定所展示活動清單的長度, 以供選擇 / 所選擇的活動可清楚地展示 (2) 顯示一對話框來確認有關選擇 (1)

114 加入一個 取消勾選 / 重設 按鈕, (1) 取消所選擇的項目, 讓用戶可簡單地重新選擇 / 減少重新載入此網頁的時間 (+1)

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117 2013 HKDSE ICT-D workshop

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