Tag: science & technology

CD audio players use laser beam technology to read digital data from the disc's microscopic pits and lands. A focused laser beam reflects off the CD surface, and the changes in reflection are converted into audio signals. Options A, B, and D describe technologies from vinyl records or other obsolete formats.

Thomas Edison developed the first commercially practical incandescent light bulb in 1879. While earlier inventors like Swan and others worked on electric lighting, Edison's design was the first viable, long-lasting bulb that could be mass-produced and widely adopted.

Thomas Edison developed the first commercially practical incandescent light bulb in 1879. While earlier inventors like Swan and others worked on electric lighting, Edison's design was the first viable, long-lasting bulb that could be mass-produced and widely adopted.

Thomas Edison developed the first commercially practical incandescent light bulb in 1879. While earlier inventors like Swan and others worked on electric lighting, Edison's design was the first viable, long-lasting bulb that could be mass-produced and widely adopted.

Thomas Edison developed the first commercially practical incandescent light bulb in 1879. While earlier inventors like Swan and others worked on electric lighting, Edison's design was the first viable, long-lasting bulb that could be mass-produced and widely adopted.

Thomas Edison developed the first commercially practical incandescent light bulb in 1879. While earlier inventors like Swan and others worked on electric lighting, Edison's design was the first viable, long-lasting bulb that could be mass-produced and widely adopted.

Thomas Edison developed the first commercially practical incandescent light bulb in 1879. While earlier inventors like Swan and others worked on electric lighting, Edison's design was the first viable, long-lasting bulb that could be mass-produced and widely adopted.

Thomas Edison developed the first commercially practical incandescent light bulb in 1879. While earlier inventors like Swan and others worked on electric lighting, Edison's design was the first viable, long-lasting bulb that could be mass-produced and widely adopted.

TTL stands for Time To Live, a field in network protocols (especially IP) that limits the lifespan of a data packet. Each router decrements this value, and when it reaches zero, the packet is discarded to prevent indefinite circulation. Options A and C use 'Language' and 'Layer' incorrectly, while D is not a real technical term.

ECP stands for Extended Capabilities Port, a parallel port mode defined in IEEE 1284 standard that supports high-speed bidirectional communication. It's commonly used for connecting printers and other peripherals to computers. The other options with 'Part', 'Connection', and 'Peripheral' are fabricated expansions.