Tag: science & technology

The ozone layer thinning, commonly called the 'ozone hole', is most severe over Antarctica due to unique atmospheric conditions. During the Antarctic spring, extreme cold and polar vortex winds create chemical reactions that destroy ozone molecules. While ozone depletion occurs globally, the most dramatic thinning happens over the South Pole.

Unhygienic means lacking cleanliness or sanitary conditions, so 'dirty' is the correct synonym. Pleasant, cold, and sweet are unrelated concepts that don't match the meaning of unhygienic. The word comes from 'hygiene' which refers to health and cleanliness practices.

HTML (HyperText Markup Language) is primarily used to create and structure web pages. It defines the content and layout of web documents. HTML is not used for plotting graphs, language translation, or solving equations - those require different tools.

A modem (Modulator-Demodulator) converts digital signals to analog for transmission over phone lines, then back to digital. Option D has 'Demodulater' typo but is the intended correct answer. The other options are nonsense acronyms unrelated to modems.

ISP stands for Internet Service Provider, companies that provide access to the internet. ISPs offer services like broadband, dial-up, and wireless connectivity. The other options - Internet Survey Period, Integrated Service Provider, and Internet Security Protocol - are not the correct expansion.

WWW is the standard abbreviation for World Wide Web, the information system of the Internet that uses HTTP protocols to access documents and resources linked by hyperlinks and URLs.

Hard drive storage capacity is measured in bytes, with gigabytes (GB) being the standard unit for modern drives. MHz measures processor speed, Mbps measures data transfer rates, and 52X refers to CD-ROM drive speeds.

The CPU (Central Processing Unit) is called the 'brain' of the computer because it executes instructions, performs calculations, and coordinates all other components - similar to how a brain controls the body. RAM and ROM are memory types, and the Monitor is an output device.

ROM (Read-Only Memory) is permanent memory built into computers because it retains data without power and cannot be modified - perfect for storing boot firmware and essential system instructions. RAM is volatile (lost without power), CPU is a processor, and CD-ROM is removable media.

Standard CDs (CD-ROM, CD-R) typically store about 650-700 Megabytes of data. 1.4 MB is floppy disk capacity, 10 MB and 150 MB are far too low for CDs.