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Sin título
Fichas del conjunto (20)
- 1What is meant by the term ASCII?ASCII is the American Standard Code for Information Interchange - an 8 bit encoding method.
- 2What is meant by the term Unicode?Unicode is a 16 bit encoding method ideal for representing all languages.
- 3Covert the decimal number 39 to: a) Binary b) BCD c) Hexadecimala) 100111
b) 0011 1001
c) 27 - 4Convert 10000101 into decimal133
- 5Express 9.125 in binary.1001.001
- 6Explain how to convert between binary and hexadecimal numbers.Group the bits into 4s from the RHS and write hex digits underneath each group of 4.
- 7Why is BCD not a true binary code?It is not a number base.
- 8Work out 1011 + 1111, in base 2.11010
- 9Work out 1100 - 110, in base 2.110
- 10What is the largest positive decimal number that can be represented using 16 bits. (No negative numbers are needed.)65355
- 11What is a floating-point number?A number with a mantissa and an exponent.
- 12What are the twos complement representations of -29 and -56 using 8 bits?11100011 and 1100100
- 13What is the decimal equivalent of the twos complement 8 bit number 11110000?-16
- 14Describe what is meant by each of the terms search engine and virtual learning environment and give an example of how each might sensibly be used during school lessons.A search engine is an application, accessed over the internet, which can be used to search for web sites on a particular topic. It could be used for subject specific research.
A virtual learning environment is an application designed to help in the management and use of learning materials. - 15Describe a situation where face recognition might be used for security purposes, and describe a possible concern which people might have over the use of face recognition in this situation.Face recognition could be used for instance by the police at football grounds to check for known trouble-makers, by comparing current images with stored images (other examples could relate to airport security, city centre drunkenness problems, etc.) There could be a concern over the lack of privacy if innocent people’s facial images are stored by the police.
- 16What name is given to processes, such as face recognition or finger print recognition when used for security purposes.Biometrics
- 17Explain the terms serial transmission and parallel transmission in a computer system and give one advantage of each type of transmission.Serial transmission: data is sent one bit at a time along the same data line. Serial can travel longer distances than parallel.
Parallel transmission: all bits in a byte are sent simultaneously along separate lines.
Transmission is faster than serial transmission - 18Data can be transmitted using simplex, half duplex or full duplex. Describe each of these transmission methods.Simplex is where data transmission in only possible in one direction.
Half duplex is where data transmission is only possible in one direction at a time.
Full duplex is where data transmission is possible in both directions simultaneously. - 19Why are network protocols necessary?Protocols are necessary to specify data formats, etc, to enable devices to communicate with each other.
- 20Explain what is meant by the term linked list and describe one benefit and one drawback of using a linked list compared with using an array.A linked list is a set (accept list) of data elements, where each element contains: the data itself and a pointer to the next element. New items can be inserted into a linked list without rearranging all the other elements. Can only be accessed in a linear manner
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- Fichas sobre Sin título, creado por Paul Roskell el 15/11/2014.
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