### 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

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

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

Question 29 :

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

B). Stimulated emission
D). Einstein oscillation

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