science & technology Online Quiz - 511

Yahoo was founded in January 1994 by David Filo and Jerry Yang, two Stanford University graduate students. It began as 'Jerry and David's Guide to the World Wide Web' before being renamed Yahoo. Dennis Ritchie and Ken Thompson created Unix, Vint Cerf and Robert Kahn developed TCP/IP, and Steve Case founded AOL while Jeff Bezos founded Amazon.

UNIX is not an acronym. The name was a pun on 'Multics' (Uniplexed Information and Computing Service), but the creators Ken Thompson and Dennis Ritchie have clarified that UNIX does not stand for anything specific - it's just a name.

Hard disk drives use magnetic storage technology where data is encoded on magnetic platters using read/write heads. Laser technology is used in optical drives (CD/DVD), light is used in fiber optics, and chemical storage is not a standard computer storage mechanism.

AOL (America Online) was primarily an internet service provider and online service, not a web browser. Opera, Netscape Navigator, and Internet Explorer are all web browsers. Note that the question has a grammatical error - it should say 'not an Internet browser' (singular).

UNIX and DOS are well-known operating systems. SuSE (now SUSE Linux) is a Linux distribution and thus an operating system. OSD is not a recognized operating system - it appears to be a made-up option for this question.

A hard disk drive contains platters (magnetic disks) that spin and store data. Motherboards and riser boards are circuit boards in the computer, not part of the HDD. Lasers are used in optical drives, not magnetic hard drives.

Optical, Mechanical, and Optical-Mechanical are all real mouse technologies. Mechanical mice use a ball, optical mice use LED light, and optical-mechanical combines both. 'Motorized' is not a recognized mouse technology - it appears to be a fabricated option.

Vinton Cerf, often called the 'Father of the Internet,' co-developed TCP/IP protocols with Bob Kahn. This foundational work enabled the modern internet's development.

The question tests knowledge about the founders of Indiainfoline.com. According to the answer key, the statement attributing the venture to Raj Koneru, B.G. Mahesh, and Madhu Kodali is false.

The term "Information Superhighway" was popularized by Al Gore, but the name in the question is misspelled as "Ald Goreds." Since the statement contains this error, the claim that "Ald Goreds" coined the term is false.

Yahoo's name was indeed inspired by the 'Yahoos' - a race of brutish creatures described in Jonathan Swift's 1726 novel 'Gulliver's Travels'. Founders Jerry Yang and David Filo chose the name because they considered themselves yahoos in the literary sense.

The speed of light in vacuum is approximately 3×10^8 m/s, which equals 3×10^10 cm/s. Option B correctly converts this value to centimeters per second, while the other options use incorrect units or magnitudes.

1 atomic mass unit (amu) equals 931.5 MeV/c² in energy units, which is approximately 931 × 10^5 eV/c². This conversion is fundamental in nuclear physics for calculating mass-energy equivalence.

Planck's constant (h) is 6.626 × 10^-34 joule-seconds, a fundamental constant in quantum mechanics that relates the energy of a photon to its frequency. The unit must be J·s (energy × time), not J/s (energy divided by time).

Bohr's radius (a₀) is the most probable distance between the nucleus and electron in a hydrogen atom in its ground state. Its value is approximately 0.529 angstroms or 52.9 picometers.

Avogadro's number (6.022 × 10²³) is the number of particles (atoms, molecules, or ions) in one mole of a substance. This fundamental constant in chemistry relates atomic mass to molar mass.

Cytology is the branch of biology that studies the structure, function, and chemistry of cells. The suffix '-logy' means study of, and 'cyto-' refers to cells. The other options are either misspelled or fictitious terms not used in life sciences.

Pathology is the branch of medicine that studies the nature, causes, and effects of diseases through examination of organs, tissues, and bodily fluids. The term comes from Greek 'pathos' (suffering, disease) and '-logy' (study of). The other options are misspelled or nonexistent terms.