252. In which decade was the first solid state integrated circuit demonstrated?

A. 1950s
B. 1960s
C. 1970s
D. 1980s
✅ The correct answer is option A.
On September 12, 1958, Jack Kilby demonstrated the first working IC while working for Texas Instruments, although the U.S. patent office awarded the first patent for an integrated circuit to Robert Noyce of Fairchild.

256. 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.

260. The input used by an antenna or cable to a TV set uses frequencies called…?

A. IF
B. RF
C. AF
D. SAP
✅ The correct answer is option B.
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.