ZHSS 2018 P1

Setter: Mr. Calvin Heng Vetter: Mr. Low Kee Ley This question paper consists of 14 printed pages including this cover page. ZHONGHUA SECONDARY SCHOOL PRELIMINARY EXAMINATION 2018 SECONDARY 4 EXPRESS Candidate’s Name Class Register Number COMPUTING 7155/01 Paper 1 13 September 2018 2 hours Additional Materials: NIL READ THESE INSTRUCTIONS FIRST Write your index number and name on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all the questions. Write your answers in this question booklet. Give non-exact numerical answers correct to 3 significant figures, or 1 decimal place in the case of angles in degrees, unless a different level of accuracy is specified in the question. The use of a scientific calculator is expected, where appropriate. You are reminded of the need for clear presentation in your answers. At the end of the presentation, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 80. For Examiner’s Use:

2 1 Define the term ‘computer’. [3] _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ It is said that the modern smartphone is a computer. From your definition above, describe two areas where the smartphone meets the requirements of the definition. [2] _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________

3 2 Number Systems. All workings must be shown clearly. (a) Convert the Hexadecimal number 4D to Denary: [2] _____________________________________________________________ (b) Convert the Binary number 101011110101 to Hexadecimal: [2] _____________________________________________________________ (c) Convert the Denary number 844 to Hexadecimal: [2] _____________________________________________________________ (d) Convert the Binary number 1010111111001000 to Denary: [2] _____________________________________________________________ 3 Data Protection. (a) Study the following exhibit. Is this a case of data loss or data corruption? Explain your answer briefly. [2] _____________________________________________________________ _____________________________________________________________ (b) Describe one way to prevent Data Loss. [1] ______________________________________________