75. The most common format for a home video recorder is VHS. VHS stands for…?

A. Video Home System
B. Very high speed
C. Video horizontal standard
D. Voltage house standard
✅ The correct answer is option A.
JVC (Japan Victor Corporation) and Matsushita (Panasonic) developed the VHS format to compete with Sony which developed the Beta format as the first home video cassette recorder. VHS originally stood for Vertical Helical Scan, but now means Video Home System.

76. 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
✅ The correct answer is option D.
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.

80. 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
✅ The correct answer is option B.
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.