Tag: science & technology

Andromeda is the nearest major galaxy to the Milky Way and is our closest galactic neighbor at about 2.5 million light-years away. It is a spiral galaxy larger than the Milky Way and is on a collision course with our galaxy. M90 is a more distant galaxy, Crab refers to the Crab Nebula (not a galaxy), and 'Giant' is too vague.

Titan, Saturn's largest moon, is the only moon in our solar system known to have stable bodies of liquid on its surface - specifically lakes and rivers of liquid methane and ethane. Discovered by the Cassini mission, these features make Titan one of the most Earth-like worlds in our solar system. Phobos is a moon of Mars, while Miranda and 'Castillo' (misspelled Calypso?) are not associated with methane lakes.

Neil Armstrong was the first person to step on the moon during the Apollo 11 mission in 1969. Buzz Aldrin followed him shortly after, becoming the second human to walk on the lunar surface. Michael Collins remained in the command module orbiting the moon.

Star color directly indicates its surface temperature due to blackbody radiation - hotter stars appear bluer (shorter wavelength peak), while cooler stars appear redder (longer wavelength peak). Size, shape, and distance do not determine color.

Photoelectric cells work on the photoelectric effect where photons of light energy eject electrons from a material, creating electrical current. This is the principle behind solar cells and light sensors. The reverse process (electrical to light) occurs in LEDs.

A hygrometer measures humidity (water vapor content in air). A thermometer measures temperature, a barometer measures atmospheric pressure, and a hydrometer measures liquid density (not to be confused with hygrometer).

William Herschel discovered infrared radiation in 1800 when he used a prism to split sunlight and found that a thermometer just beyond the red spectrum showed the highest temperature. This led to the discovery of invisible infrared rays.

Tata Consultancy Services (TCS) has its headquarters in Mumbai, Maharashtra. It was founded in 1968 and is India's largest IT services company by market capitalization and revenue. Chennai, Pune, and Delhi are major IT hubs but not TCS headquarters.

TCS began as 'Tata Computer Centre' in 1968, initially providing computer services to other Tata Group companies. It was later renamed to Tata Consultancy Services. The other options are not historically accurate names for TCS.