World Science and Technology – Exercise – 4

156. 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

Answer
Answer : (a)
Explanation
Explanation : 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. Let us discuss.
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157. The average power (in watts) used by a 20 to 25 inch home color television is…?

(a) 70-100
(b) 25-50
(c) 500-800
(d) Over 1000

Answer
Answer : (a)
Explanation
Explanation : About the same as as the most popular light bulb size. Let us discuss.
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158. The electromagnetic coils on the neck of the picture tube or tubes which pull the electron beam from side to side and up and down are called a…?

(a) Transformer
(b) Yoke
(c) Capacitor
(d) Diode

Answer
Answer : (b)
Explanation
Explanation : Twisting the yoke will tilt the picture. A projection color television uses three picture tubes and yokes for red, green and blue light. Let us discuss.
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159. The input used by an antenna or cable to a TV set uses frequencies called…?

(a) IF
(b) RF
(c) AF
(d) SAP

Answer
Answer : (b)
Explanation
Explanation : RF is radio frequency. IF is intermediate frequency used inside the TV for processing. AF is audio frequency. SAP is second audio program which may have another language or other soundtrack as an option to the main soundtrack. Let us discuss.
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160. 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
Answer : (c)
Explanation
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. Let us discuss.
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