Tag: science & technology

While extremely rare, there are documented cases of people dying from laughter, typically due to heart failure or asphyxiation. The most famous historical case is the Greek philosopher Chrysippus (3rd century BC) who reportedly died of laughter after watching a donkey eat figs. Modern cases include fatalities from laughter-induced cardiac arrhythmias or rupture of the weak blood vessels in the brain from excessive laughing.

ISRO stands for Indian Space Research Organisation. Note the British spelling 'Organisation' with an 's', not 'Organization'. Other options either have incorrect words or spelling errors.

NASA stands for National Aeronautics and Space Administration. The key word is 'Aeronautics' (the science of flight), not 'America' or just 'Air'. Option C is the only fully correct expansion.

After Columbia was destroyed in 2003, Discovery became the primary workhorse shuttle for NASA's remaining missions. Challenger had been lost in 1986. Moon Lander and Insect B are nonsensical options in this context.

Explorer 1, launched on January 31, 1958, was America's first satellite. It discovered the Van Allen radiation belts. Columbia and Discovery were Space Shuttles (1980s), not satellites.

Hydrogen, with atomic number 1, is the first and lightest element on the periodic table. It has one proton in its nucleus and typically one electron orbiting it, making it the simplest atom.

The nucleus is indeed the central region of an atom. It contains positively charged protons and neutral neutrons, while electrons orbit around this core.

On the pH scale of 0-14, acids have pH values below 7, bases have pH values above 7, and 7 is neutral. The lower the pH, the stronger the acid. This is a fundamental chemical property.

Earth's atmosphere is approximately 78% nitrogen, making it the most abundant gas by far. Oxygen is second at about 21%, with trace gases like argon and CO2 making up the remaining 1%.

Electrons carry a negative electrical charge, not positive. Protons, found in the nucleus, carry positive charge. This fundamental property determines how electrons interact with electric fields and other charged particles.