(a)(i) State and describe three types of error can occur in programming:            (3 Marks)

__________________________________________________________________________________________________________

        (ii) When is a programming language considered structured?                  (2 marks)

(b)(i) The Global Science Museum is not large and can become over-crowded when more than 300 people are in the building. They would like a program that will stop visitors from entering when more than 300 visitors are in the building.

Design a Pseodocode segment for this problem using a REPEAT loop. You do not have to worry about visitors who leave the building, just those who have entered.                   (3 Marks)

(ii)Indentify Three aspects of a good HCI? .                          (3 Marks)

(c)(i)Give one advantage of compliers over interpreters                              (1 mark)

  (ii)Give one advantage of interpreters over compliers                               (1 mark)

(iii)Explain briefly why the source codes must be translated again if the programmer wants

to use the program on a computer with a different platform.               (1 mark)

(iv). Explain why a programmer may prefer to write code for device drivers using low level languages.

   (1 Mark)

(a) (i) With the aid of examples, explain number complements in the Binary number systems

                                    (2 marks)

                  (ii) Outline the benefits of using binary number complementation in computers.     (2 marks)

   (b) (i) Why is binary number system best suited for use in computers?                                             (2 marks)

(ii) Convert the following base two number into base ten.                   (2 marks)

11.01

(iii)Convert the following base sixteen number into base two.                            (2 marks)

DEF=

(c) Carry out the following binary arithmetic:

(i) 11 + 10                                    (1 mark)

(ii) 101 X 11                                     (1 mark)

( iii) 101/11                                          (1 mark)

  (iv) 101 11                                     (1 mark)

Describe briefly the three data processing modes                                                   (3 marks)

Batching Processing Mode

Real-time Processing Mode

Interactive Processing Mode

(b)(i)Suggest two possible reasons for data preparation errors.                       (2 marks)

   (ii) Suggest two possible reasons for data input errors.                             (2 marks)

(c) (i)Distinguish between data validation and data verification.                           (1 mark)

   (ii)Give two examples of data verification techniques.                   (2 marks)

(d) Describe briefly the following data validation techniques

Presence Check                           (1 mark)

_

Type Check                               (1 mark)

_

Range Check                                    (1 mark)

_

Control Total Check                           (1 mark)

_

Parity Checks                                                     (1 mark)

(a) (i) Explain the term search engine                                                                                 (1 mark)

             (ii) Peter and Mary use the same keyword to search for information. Suggest two reasons

                why their search results are different.                        (2 marks)

          (iii)State one disadvantage of using an e-mail account provided by the Internet service

                provider (ISP).                                                                                                   (1 mark)

(b)  (i) Explain the term URL                                              (1 mark)

        (ii) For the URL http://www.csklsc.net/pe/calendar.htm,

      http stands for                                                                    (1 mark)

The domain name is                                                                       (1 mark)

    The top-level domain (TLD) is                                      (1 mark)

  pe stands for                                                      (1 mark)

(c) (i) Explain the term communication protocol                          (1 mark)

      (ii)Explain the following types of communication protocol

Ethernet                                       (1 mark)

________________________________

            Token Ring                                       (1 mark)

         TCP/IP                                                                 (1 mark)

(iii)Give Two examples of wireless-based communications channels.             (2 marks)

(a).Describe the role of the systems analyst.                       (2 Marks)

   (b).Describe Two techniques used by the systems analyst in requirements elicitation.          (2 Marks)

     (c)What is a requirements specification and what does it contain?                         (5 Marks)

(d) Software development is often said to be an iterative process.

       Describe Two events that might spark an iterative process in software development.         (2 Marks)

(e) (i) Describe briefly the three basic e-commerce models.                    (3 Marks)

        (ii) Apart from parental control, state one other ways of Internet censorship.

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