Tag: science & technology

Biogas offers multiple advantages: it burns cleanly without smoke (A), the fermented slurry is rich in nutrients and can be used as fish feed or fertilizer (B), and it has high potential in rural India where raw materials are readily available (C). Since all three statements are correct, 'All of the above' is the right choice.

Fuelwood (firewood) remains the most common non-commercial biological fuel in developing countries, used by billions of people for cooking and heating. It is gathered rather than purchased commercially. While crop residue and animal dung are also used, fuelwood dominates in terms of total energy consumption. Coal is a commercial fossil fuel, not a biological fuel.

Otology is the branch of medicine and biology that specifically studies the ear, its anatomy, physiology, and diseases. The prefix 'oto-' comes from Greek 'ous' meaning 'ear'. Otologists treat hearing disorders, balance problems, and ear infections. Dermatology studies skin, orthopedics studies bones, and ophthalmology studies eyes.

ENIAC (Electronic Numerical Integrator and Computer), completed in 1945 at the University of Pennsylvania, is widely recognized as the first general-purpose electronic digital computer. While not the first programmable computer (Zuse Z3 was earlier), ENIAC was the first to gain widespread recognition and is the standard answer in most curricula.

The Zuse Z3 was indeed created by German engineer Konrad Zuse in 1941, making it the world's first fully programmable, digital computer that used binary arithmetic. It was an electromechanical machine that was destroyed during World War II but remains a landmark achievement in computing history. Germany is the correct answer.

CP/M (Control Program/Microcomputers), created by Gary Kildall in 1974, was the first operating system to gain widespread use on personal computers, particularly on early machines running on Intel 8080 and Zilog Z80 processors. It served as the foundation for many early PC operating systems and influenced the design of MS-DOS.

In computing, a 'nibble' (also spelled 'nybble') is indeed half a byte, consisting of 4 bits. The term is a play on 'byte' and has been used in computer science since the 1950s. It's a standard unit of digital information that can represent 16 different values (0-15).

A mickey is indeed the unit of measurement for mouse movement in computing. It represents the smallest increment of movement that a mouse can detect and report to the computer. Option D is incorrect as it refers to sensitivity (which is measured differently), while option A describes a mouse pointer and C describes a wireless mouse, not the unit itself.

The floppy disk was indeed developed by IBM in the late 1960s, specifically by an IBM team led by David Noble. While the question asks 'who' (implying a person), all options are companies, and among these choices, IBM is the correct answer as they were the organization that invented and commercialized the floppy disk.

Ray Tomlinson is widely credited with inventing email in 1971. He implemented the first email system on the ARPANET and introduced the use of the '@' symbol to separate user names from machine names. The other options (chat rooms, P2P networks, online games) were developed later and by different people.