MRIEHEL SECONDARY SCHOOL HALF-YEARLY EXAMINATIONS 2016~17. Year 9 Computing Time: 1hr 30mins

Transcription

1 MRIEHEL SECONDARY SCHOOL HALF-YEARLY EXAMINATIONS 2016~17 Year 9 Computing Time: 1hr 30mins Name: Class: Please read the following instructions carefully: 1. Answer ALL the questions in the space provided on this paper. 2. Calculators are NOT allowed. 3. Good English and orderly presentation are important. 4. All working must be shown where necessary. 1. What do the following abbreviations stand for? a) CPU : b) MSB : c) GUI : d) ADC : e) ASCII : (5 marks) 2. A computer system can perform seven basic functions. a) Input is one of the seven functions of a computer system. Name the other six functions. (6 marks) Page 1 of 10

2 3. The following question is about computer systems. a) Using the following keywords, draw the basic block diagram of a computer system. Use arrows for data flow between one block and another. Input Devices Main Memory Output Devices Secondary Storage CPU Space for diagram (8 marks) b) Use numbers from 1 to 4 to order the following types of computers according to their processing power. (Note: 1 refers to the most powerful and 4 refers to the least powerful). Microcomputer Supercomputer Minicomputer Mainframe (4 marks) Page 2 of 10

3 4. Complete each row of the following table to show the same number in binary, decimal and hexadecimal. Please show your working in the space provided. Binary Hexadecimal Decimal = = = B 6 = = = 198 Space for working: (6 marks) 5. State whether the following statements are True or False : a) Hexadecimal is a convenient way to represent binary data. b) One kilobyte is larger than one megabyte. c) The Internet is just a part of the World Wide Web. d) Application software manages the computer s hardware resources. (4 marks) Page 3 of 10

4 6. What is each of the following called? a) A group of 8 bits: b) A number system that uses sixteen digits: c) Where data is temporarily stored when we copy and paste: d) Data that is processed, organized, and structured so that it becomes useful: e) A device which lets us transmit digital data over an analogue telephone line: (5 marks) 7. Underline the correct answer in the brackets for each statement. a) The computer works using ( analogue digital ) signals. b) A speedometer is an example of ( an analogue a digital ) device. c) A telephone line can only allow the transmission of ( an analogue a digital ) signal. d) The number of students in a classroom is a ( continuous discrete ) quantity. e) Sound from a microphone needs to be converted to ( an analogue a digital ) signal before being used by a computer. 8. This question is about image representation (5 marks) 9. Mark with a each of the following statements as being either raster or vector. Raster Vector a. b. c. d. Is the ideal type of image for storing someone s photo. Can be enlarged or reduced without affecting the quality of the image. Quality of the image depends on the resolution used. Images which are drawn using lines, text, and shapes. (4 marks) Page 4 of 10

5 10. This question is about Logic Circuits. a) Write the name of the Logic Gates under the symbols shown below: (3 marks) b) Fill in the blanks: i. The gate gives 1 as an output only if both inputs are 1. ii. The gate is represented by the Boolean expression X = Ā. iii. The gate gives 1 as an output if at least one of its inputs is 1. c) Consider the logic circuit below: (3 marks) i. What type of logic gate is represented by the circle labelled G1? ii. Complete the following truth table for the logic circuit above. A B C D E F (3 marks) Page 5 of 10

6 11. This question is about application and system software a) Use arrows to match the following tasks with the most appropriate programme. The first one has been done for you. Task required To write a letter to a friend To do research on the Internet To calculate expenses To create a greeting card Program to use Spreadsheet Software Graphics Software Word Processor Web Browser (3 marks) b) For each description below, mention the utility/action that carries it out. Defragment Scandisk Compression Antivirus Format a. b. c. d. e. Rearranges the file and free space on your disk making files faster to access. Protects your computer from malicious programmes. Reduces the size of files stored on the computer. Prepares a disk for use and makes it capable of accepting data. Checks your storage device for any errors on their file system. (5 marks) c) Mention two features of an operating system? Feature 1 : Feature 2 : Page 6 of 10

7 12. This question is about character coding systems. a) Why is it necessary to have a standard character coding system like ASCII? b) If the character A has an ASCII code of 65, which code number represents the character K? c) Standard ASCII is a 7 bit character set. Therefore how many characters can it represent? d) Mention another character coding system that can be used to represent many more characters than ASCII. (4 marks) 13. The following questions are about Main Memory a) List two differences between RAM and ROM RAM ROM b) Mention one use of RAM in a computer system. Use of RAM: c) Mention one use of ROM in a computer system. Use of ROM: Page 7 of 10

8 14. The following questions are about . a) What is written in the Carbon Copy field? Tick ( ) the correct statement below. i. An address of a person ii. An address of a web site iii. A copy of the message b) Mention two advantage of over a regular postal service. Advantage 1: Advantage 2: 15. This question is about Word Processing a) Explain what each of the following Word features does. Spell Check : Find and Replace : Header and Footer : (3 marks) b) What is Mail Merge used for? Give an example. Page 8 of 10

9 16. The screenshot below shows part of a spreadsheet used to collect ticket sale data. a) From the screenshot above, write down the function you would type in: i. cell B7: ii. cell B8: Page 9 of 10 b) Why is the use of formulas and functions preferred over working results manually? c) Mention two other advantages of Spreadsheets. i. Advantage 1: ii. Advantage 2: 17. Fill in the following statements about the Internet a) Briefly describe what is a search engine. b) Briefly describe what a URL is used for.

10 18. Explain the difference between the following terms: a) Input and Output b) Hardware and Software c) Data and Information d) Application Software and System Software e) Internet and World Wide Web END OF EXAMINATION PAPER Page 10 of 10