GOZO COLLEGE. Boys Secondary Victoria - Gozo, Malta Ninu Cremona. Half Yearly Examination

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1 GOZO COLLEGE Boys Secondary Victoria - Gozo, Malta Ninu Cremona Half Yearly Examination Subject: Form: Time: COMPUTER STUDIES 4 Junior Lyceum 1 hr 30 min NAME: CLASS: INDEX NO: Instructions to Candidates Answer ALL questions on this paper. Do NOT write any answers on additional sheets. Item Number Practical Total Marks

2 Section A Answer ALL questions. Each question carries 5 marks. 1. a. Convert the following decimal numbers to binary and hexadecimal. Hexadecimal Binary Decimal 4D 77 Working Space: b. If the ASCII code equivalent to the letter A is 65 10, which letter does the hexadecimal number 4D 16 represent? c. Mention another character coding system apart from ASCII? 2. A logic circuit produces an output (X) of 0 when A is 1 and B is 0. a. Using A and B as inputs and X as output, draw the logic circuit that gives the above outputs. b. Draw the truth table of the logic circuit above. c. Write the Boolean Expression of the circuit in terms of A, B and X. 2

3 3. Software packages can be bought either off-the-shelf or tailor-made a. Explain the following terms: Off-the-shelf: Tailor-made: b. A word processor is usually bought off-the-shelf and not tailor-made. Why? c. Give two ways how a person can obtain an off-the-shelf program. i. ii. 4. The program below asks the user to enter the radius of a circle and then displays the area of the circle. Program Circle; VAR A, r, pi: Real; Begin End. pi:=22/7; Write( Enter the radius: ); Readln(r); pi*sqr(r):=a; Writeln( The area of the circle is: ); Readln; The above program has two errors. Write down the instruction that contains the error and the corrected instruction: a. 1 st Error: Fixed Error: b. 2 nd Error: Fixed Error: c. In the program above, pi could have been declared as a constant instead of a variable. Write down the instruction to declare pi as a constant: Const 3

4 5. a. Explain what is meant by Software Licensing. b. What is the advantage of obtaining a shareware license? c. A user downloaded a program without paying anything and can use the program for as long as s/he likes. What kind of license does this program has? d. It is always recommended that the user registers his/her software with the software publisher. Give one reason why. 6. A bank stores details of their clients accounts details such as client name, account number, address, telephone number and account balance. a. Explain the term Validation: b. List 2 fields from the above and explain a validation process that can be carried out on each field together with a short reason. i. Field 1: Validation: Reason: ii. Field 2: Validation: Reason: 7. For each of the following tasks, state the best application to use. The first one was done for you. [5] Preparing the school magazine: DTP i. Storing information about books: ii. Preparing an invoice for a shop: iii. Typing a letter to your friend: iv. Searching for a product on the internet: v. Editing a photo: 4

5 8. Data may be collected using special data capture forms and is then input into a computer for processing. a. Explain the term Data Verification: b. Which of the following items are methods of data collection for input to a computer system? Survey forms Hard disk Barcode Printers ROM i. ii. c. What is a transcription error? d. Name two transcription errors: i. ii. 9. Design a flowchart which asks the user to input a number between 1 and 10 (both included). Program first checks if number is within the given range (ie from 1 to 10) and outputs Invalid number if it is out of range. Then program should output the message Even Number or Odd Number depending if number entered is even or odd. [5] 5

6 10. The following PASCAL snippet requires the user to enter a number before it produces an output. Begin End. Write( Enter a whole number: ); Readln(N); S:=N/2; Write( Answer is:,s:0:2); Readln; a. What does the above program do? b. Give the appropriate variable type for the following variables as used in the program: N: S: c. From the program, identify the following constructs: An assignment statement: An input statement: 11. Provide one reason to explain each of the following statements: a. The word Case cannot be used as a variable in PASCAL. b. A restaurant system is usually tailor-made and NOT bought off-the-shelf. c. A spellchecker does not eliminate all transcription errors. d. People still use unlicensed software even though there are some risks involved. e. 4th Generation Languages are becoming more popular. 6

7 Section B Answer ALL questions 12. a. Consider the following Boolean Expression For the given Boolean Expression draw: X = ( ( A + B ). C ) + A i. The Logic Circuit and ii. The Truth Table. [3] b. Using Twos Complement represent the following two decimal numbers in 8 bits: i. 115 ii. -79 [4] 7

8 c. Work out using twos complement. (Please show all your working) d. What type of error is generated if the answer of is stored in an 8 bit register? e. What is the maximum number that can be stored in this system (8 bits)? f. The character set of a particular computer consists of: - The English alphabet (26 characters) both in capital and small letters - The digits 0 to 9 - The punctuation symbols:! $ % ^ & * ( ) < >?,. What is the minimum number of bits required to store this character set? 13. This question is about PASCAL. a. Explain what type of data can be stored in the following PASCAL variable types: i. Integer: ii. Real: iii. String: iv. Char: [4] 8

9 b. Write a program that asks the user to enter a mark from the keyboard. The program should display a message depending on the mark entered as shown below. In case the mark is between 1 to 40 Fail 41 to 60 Pass 61 to 80 Merit 81to 100 Symbol In case the user does not enter a mark between 1 and 100, program should output Number is out of range. Your program should include inline comments to make it more readable. 9 [11]

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