Tag: science & technology

Water's effectiveness as a coolant comes from two key properties: very high specific heat capacity (absorbs large heat energy with small temperature rise) and poor thermal conductivity (heat doesn't quickly transfer back). This dual nature makes water ideal for cooling systems. Neither property alone would be as effective.

Capillary action is the property that allows liquids to flow in narrow spaces without external forces like gravity. In a wick, the liquid rises due to adhesive forces between the liquid and wick material overcoming cohesive forces within the liquid and gravity.

On hot days, air near the road surface becomes much hotter and less dense than upper air layers. This causes total internal reflection of light from the sky, making it appear as water on the road. A mirage is what you see, but the physical phenomenon causing it is total internal reflection of light rays.

Water has both a very high specific heat capacity AND is a poor conductor of heat. Both properties contribute to its effectiveness as an insulator. Option A covers one property, Option B covers the other, making 'Both of the above' the correct choice.

3G standards include GSM EDGE (2.5G/3G transition), UMTTS (W-CDMA), and CDMA2000. LTE is actually a 4G technology, not part of the 3G family of standards. This is a common point of confusion as LTE was marketed as '4G' but early versions were often called '3.9G'.

IMT-2000 (International Mobile Telecommunications-2000) is the official ITU designation for 3G standards. The '2000' referred to both the frequency band (around 2000 MHz) and the target year of deployment. This is the standard technical name for 3G.

NTT DOCOMO launched the world's first pre-commercial 3G network in May 2001 in Japan. This was part of their FOMA (Freedom of Mobile Multimedia Access) service, which was based on W-CDMA technology and preceded full commercial launch.

NTT DOCOMO also launched the world's first commercial 3G service in October 2001, building on their earlier pre-commercial launch. This full commercial deployment made Japan the first country to have operational 3G networks available to the public.

MTNL (Mahanagar Telephone Nigam Limited) launched India's first 3G services in December 2008, ahead of private operators. BSNL followed shortly after in 2009. Airtel and Vodafone launched 3G services later after the 2010 spectrum auction. MTNL had the advantage of starting early as a state-owned operator in Delhi and Mumbai.

Samsung launched Bada OS in 2010 as their proprietary mobile operating system. It was designed to compete with iOS and Android, running on Samsung's own Wave series smartphones. Debian is a Linux distribution for computers, GNOME is a desktop environment, and Maemo was Nokia's platform.