Technology Questions and Answers

Answer: C

Files with the .mpg extension are video files.

MPEG defines the compression standards for moving pictures: MPEG-1 for the Video CD, MPEG-2 for DVD and digital broadcasting, MPEG-4 for most streaming.

Answer: D

The High Frequency band runs from 3 to 30 MHz.

HF waves are reflected by the ionosphere, so they can travel thousands of kilometres by skywave, which is why short-wave broadcasting, amateur radio and long-range aviation use the band.

Answer: B

In digital logic, 1 AND 1 = 1.

An AND gate outputs 1 only when every input is 1; any 0 gives 0. It corresponds to the logical 'both', and with OR and NOT it can build any logic function at all.

Answer: C

OSI stands for Open Systems Interconnection.

The OSI reference model divides networking into seven layers, from physical up to application. It is used as a teaching and design framework, though the internet actually runs on the simpler TCP/IP model.

Answer: B

John Resig created jQuery, releasing it in 2006.

It smoothed over the differences between browsers and made DOM manipulation, event handling and AJAX far simpler. At its height it was used on a majority of the world's websites.

Answer: C

The country code for Spain is .es.

It comes from España, the country's own name, since ISO country codes are not always based on the English form - Germany is .de for Deutschland and Switzerland .ch for Confoederatio Helvetica.

Answer: D

EMF stands for electromotive force.

Despite the name it is not a force but an energy per unit charge, measured in volts. It is the work a source such as a cell or generator does in driving a unit charge round the circuit.

Answer: B

The part of a database holding one type of information is a field.

A field is a column - surname, or date of birth. A record is a row, one complete entry made of all its fields, and a file or table is the whole collection of records.

Answer: B

A batch file has the extension .bat.

It holds a list of commands the interpreter runs in sequence. AUTOEXEC.BAT, which ran automatically at startup, was the best known.

Answer: B

Thomas Davenport invented the electric streetcar.

A Vermont blacksmith, he built the first practical DC electric motor in 1834 and patented it in 1837, and used it to run a small electric car on a circular track - the first electric vehicle of its kind.