Everyday Science

Non-stick cooking utensils are coated with Teflon, a brand name for polytetrafluoroethylene (PTFE), which provides a non-stick surface resistant to heat and chemical reactions. The other options like black paint, PVC, and polystyrene are not used for non-stick coatings in cookware.

Anthracite coal has the highest carbon content among the types of coal listed, making it the hardest and most energy-rich form of coal. Peat has the least carbon content, followed by lignite and bituminous coal.

Johannes Kepler was the Renaissance scientist who formulated the laws of planetary motion, explaining how planets move around the sun. The other options are either misspelled or unrelated to astronomy.

Hysteria is a psychological condition and not caused by infectious agents, so it is not contagious. Measles, typhoid, and influenza are all contagious diseases caused by viruses or bacteria that can spread from person to person.

The Saros cycle is approximately 18 years, 11 days, and 8 hours long, after which nearly identical eclipses (solar or lunar) repeat. This is a well-known astronomical cycle used to predict eclipses.

Jupiter is primarily composed of hydrogen and helium gases, making option C the correct answer. These two gases constitute the majority of the planet's atmosphere.

Monoatomic gases consist of single atoms rather than molecules. Neon and argon are noble gases that exist as monoatomic gases under standard conditions, unlike nitrogen and oxygen which are diatomic molecules.

When the air temperature is below the freezing point of water, precipitation falls as snow because water vapor freezes directly into ice crystals. Other options like lightning, hailstorms, and thunders are not forms of precipitation caused by freezing air temperature.

Soap and detergents remove dirt by lowering the interfacial tension between water and oil/dirt, allowing the dirt to be emulsified and washed away.

The molecular weight of ammonia (NH3) is calculated by adding the atomic masses of one nitrogen atom (approximately 14.007 g/mol) and three hydrogen atoms (approximately 1.008 g/mol each), totaling about 17.031 g/mol, which corresponds to option A.