• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

140 Computing A-Level Revision Questions

Extracts from this document...


COMPUTING A LEVEL REVISION QUESTIONS 1. What three factors comprise the ACCESS TIME for disk. Explain each briefly. 2. A file has a high hit rate. Explain this and its significance in file design. 3. Describe the three functional parts of a shared bus. 4. Explain batch and transaction processing. Give a suitable application of each and suggest an advantage and disadvantage of one over the other. 5. Explain buffering, why it is necessary and give two examples of its use. 6. Define bit, byte and word. 7. Explain cache memory. 8. Explain character set and control characters (with examples). 9. COM is a WORM method of storage. Explain this and state a more up to date example of a WORM. 10. Name and briefly describe the five main functional parts of a computer. 11. Define cylinder with respect to magnetic disk. 12. Explain, with an example, the difference between data and information. 13. Define a database and a DBMS. What are the advantages of a database over the conventional multiple file approach? 14. Give four examples of data capture. 15. Describe how records are organised in a) indexed sequential files b) direct access files 16. How does overflow occur in direct access files? 17. Explain EFTPOS. ...read more.


Numbers are in normalised floating point form with 8 bits for the mantissa and 4 bits for the exponent. Twos complement is used for both parts. What decimal numbers do the following represent: i) 01100101 0011 ii) 10100011 0100 72. Perform the following subtraction using the twos complement method, showing all working: 72.25 - 38.75 (use a 12-bit word and fixed point format with 8 bits before the point) 73. What are the two features of Assembly languages which make them easier to use than machine code? 74. What are the advantages of high level languages over assembly code? 75. State two advantages of low level languages over high level languages? 76. A stock control system uses batch processing. State 6 items of data which the Master File might contain. State the items of data needed in the Transaction File for each stock record. 77. Explain block packing density and cylinder packing density with reference to the creation of indexed sequential and direct access files. 78. Suggest, with reasons, a method of processing for each of the following applications (in some cases more than one might be used): payroll stock control airline reservations insurance company banking library borrowers' file library book catalogue 79. ...read more.


128. One of the functions of an operating system in multiprogramming is memory management. What does the operating system need to do and how might it be achieved? 129. On what basis might the schedular issue a high priority to a process in multiprogramming? 130. Why can priorities not normally be issued in a multi-access system? What scheduling policy might be used instead? 131. Why is normalisation generally carried out on a relational database? Give a simple example to illustrate your answer. 132. Discuss briefly the problems of concurrent access in databases and how it may be overcome. 133. State three provisions of the UK Data Protection Act concerning the storage of and access to personal data within computer systems. Name some exemptions from these provisions by the act. 134. What is meant by the term ASCII character? 135. State one advantage and one disadvantage of static ram over dynamic ram. 136. Explain the term bit-mapped screen display. 137. What are the advantages of packet switching? 138. Describe two checks which may be made to detect errors in data transmission 139. What is the purpose of the process descriptor (process control block) of a process in multiprogramming? Give three items of information contained in this block.. 140. Give three error conditions which would give rise to an interrupt. ?? ?? revision\revquns.doc Joyce Veitch 15/03/00 page6 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Computer Science section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Computer Science essays

  1. Marked by a teacher

    Compilers and Interpreters

    5 star(s)

    Compiler A compiler takes a computer program that is written by the programmer (the source program) and translates it into machine code (the target program). This process comprises three main steps, as illustrated below Lexical Analysis The main purpose of the lexical analysis is to convert the source program into

  2. Control Unit, Memory Unit, and Arithmetic Logic Unit. The CPU or Central Processing ...

    This is necessary because when using a laptop there may not be a flat surface available. c) Barcode readers. A barcode reader is a laser scanner that reads the reflected laser light from a series of dark and light coloured lines of varying thickness.

  1. Business blue print document for the implementation of SAP R/3 (4.6B) payroll at Mastek ...

    Professional Tax (PTax) Reports Payroll-India caters to the PTax Reports for the following states: - 1. Andhra Pradesh (Monthly) - Not applicable for Mastek 2. Gujarat (Monthly) - Not applicable for Mastek 3. Karnataka (Monthly) - Applicable for Mastek 4. Maharashtra (Monthly) - Applicable for Mastek 5. West Bengal (Monthly)

  2. Hardware and software ICT revision notes

    These instructions are permanently stored in the computer's memory. When the computer id first turned on or re-started, it reads the start-up instructions in the ROM BIOS chip. BIOS stands for basic input output system and is a set of instructions that tells the computer how to handle the flow of data between the computer and its input and output peripherals, such as the keyboard and printer.

  1. LAN & WAN Protocols

    It works with to lower layer of the OSI model. The data link layer and the physical layer. It further splits the data link layer into Logical Link Control and Media Access Control. IEEE 802.11 This is the standard which handles Wi-Fi connections.

  2. What are the principle advantages and disadvantages of the Airbus A380 in respect of ...

    Airlines operating an Airbus fleet can take advantage of this Cross Crew Qualification (CCQ) and operate Mixed Fleet Flying (MFF). MFF means greater crewing schedule flexibility allowing a relatively small pool of Pilots to fly both short and long-haul flights.

  1. I have been given the task to design a database for a company called ...

    This report is shown below. As you can see it is clear and simple. Buttons As you can see from the above screen prints I have used button in all of the switchboards which when clicked will take the user to the forms and queries as specified on the buttons themselves.

  2. What are Internet Business models? Give examples of them. Outline how they might ...

    Although the end-user development allows uses to specify their own business needs and leads to a higher level of user involvement and satisfaction with the system, end-user computing poses organizational risks because it occurs outside of traditional mechanisms for information system management and control.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work