Exercise 1

Question 26 :

The sampling rate, (how many samples per second are stored) for a CD is...?


A). 48.4 kHz
B). 22,050 Hz
C). 44.1 kHz
D). 48 kHz
Answer : Option C

Explanation :

CDs reproduce 44,100 samples per second. Which has a maximum frequency reproduction of 22,050 Hz, or just a hair past the upper limit of human hearing. In this way CDs can theoretically reproduce any frequency in the human hearing range.


Question 27 :

Who created Pretty Good Privacy (PGP)?


A). Phil Zimmermann
B). Tim Berners-Lee
C). Marc Andreessen
D). Ken Thompson
Answer : Option A

Explanation :

Phil Zimmermann created the first version of PGP encryption in 1991. Pretty Good Privacy (PGP) is a data encryption and decryption computer program that provides cryptographic privacy and authentication for data communication. PGP is often used for signing, encrypting and decrypting texts, E-mails, files, directories and whole disk partitions to increase the security of e-mail communications.


Question 28 :

What do we call a network whose elements may be separated by some distance? It usually involves two or more small networks and dedicated high-speed telephone lines.


A). URL (Universal Resource Locator)
B). LAN (Local Area Network)
C). WAN (Wide Area Network)
D). World Wide Web
Answer : Option C

Question 29 :

After the first photons of light are produced, which process is responsible for amplification of the light?


A). Blackbody radiation
B). Stimulated emission
C). Planck's radiation
D). Einstein oscillation
Answer : Option B

Explanation :

The word "laser" is actually an acronym for light amplification by stimulated emission of radiation. Atoms or molecules of the active medium that have been excited to a higher energy level are stimulated by a passing photon to relax to a lower energy level and emit a photon that is indistinguishable from the passing photon, thereby increasing the number of photons like the incident one.


Question 30 :

Which is NOT an acceptable method of distributing small power outlets throughout an open plan office area?


A). Power Poles
B). Power Skirting
C). Flush Floor Ducting
D). Extension Cords
Answer : Option D

Explanation :

Extension cords can be a tripping hazard, and can be easily damaged, causing an unsafe situation. There are many ways of safely getting power to each work place, where wiring is protected and concealed.