Technology and Web Services Quiz

The frequency range of human hearing is 20 Hz to 20 kHz for healthy young adults. This is the standard audiological range - below 20 Hz are infrasounds and above 20 kHz are ultrasounds that humans cannot perceive.

The frequency range used in traditional telephone systems is 300 Hz to 3.4 kHz. This is known as the 'voice band' or 'telephone bandwidth' - it was chosen to preserve intelligible speech while minimizing bandwidth requirements in early telephony infrastructure.

The bandwidth of a narrow band communication channel is 64 Kbps. This is a standard telecommunications specification - 64 Kbps (kilobits per second) is the bandwidth of a single digital voice channel, commonly used in ISDN and other telephony standards. The option '64KBps' would be incorrect as it refers to kilobytes.

Yahoo! Gallery was indeed a directory that showcased third-party applications and mashups built using Yahoo APIs. Yahoo! Groups is for online communities, Yahoo! Assistant was a help service, and Yahoo! Español is the Spanish-language portal.

Yahoo! Publisher Network was Yahoo's advertising program for publishers (similar to Google AdSense) that was initially in beta and limited to US publishers. Yahoo! Mash was a short-lived social network, and Yahoo! Avatars was for creating cartoon avatars.

Yahoo! Pipes was a visual editor for creating RSS mashups by combining multiple data sources. It was a pioneering web-based data manipulation tool. Yahoo! Widgets was for desktop widgets, Yahoo! Tech was a tech news site, and Yahoo! Video was for video sharing.

Yahoo! Upcoming was a local events discovery service that showed what was happening in your area. Yahoo! Personals was for dating, Yahoo! Real Estate for property listings, and Yahoo! Shopping for e-commerce.

Common table salt has the chemical formula NaCl, which consists of sodium and chloride ions. The question specifically asks about salt composition, and chloride is the correct chemical component.