General Science Fundamentals Quiz

The chemical symbol for tungsten is W, derived from its German name 'Wolfram'. Many elements have symbols that don't match their English names, like Na for sodium (natrium) or Fe for iron (ferrum). The options Tu, T, and Tg are not valid chemical symbols for any element.

When an acid reacts with an alkali (base), a neutralization reaction occurs producing salt and water. For example, HCl + NaOH gives NaCl (salt) + H2O (water). Option A describes the reaction name, not the products. Hydrogen gas is produced when acids react with metals, not alkalis.

Crude oil is also known as petroleum. The term petroleum comes from the Latin words 'petra' (rock) and 'oleum' (oil). Diesel, paraffin, and petrol are all refined products derived from crude oil, not names for crude oil itself.

The claimed answer is 'amalaze' but the correct spelling is 'amylase'. Amylase is the enzyme that breaks down starch into simpler sugars. Protease digests proteins, not starch. Rennin helps curdle milk in infants. 'Amalyn' is not a recognized digestive enzyme. The answer is conceptually correct but has a typo.

Marble is a metamorphic rock formed from limestone undergoing intense heat and pressure. Metamorphic rocks are transformed from existing rock types. Igneous rocks form from cooling magma, sedimentary rocks from accumulated deposits, and conglomerate is a specific type of sedimentary rock.

Bauxite is the principal ore of aluminium, containing aluminium hydroxide minerals like gibbsite, boehmite, and diaspore. It is the primary source of aluminium metal production worldwide. Haematite is an iron ore, while aluminite and alumina are not standard ore names (alumina is aluminium oxide produced from bauxite).

Red blood cells (erythrocytes) are produced in the bone marrow through a process called erythropoiesis. In adults, this primarily occurs in the flat bones like the sternum, ribs, and pelvis. The liver produces red blood cells only during fetal development, while the spleen filters and stores old red blood cells rather than producing them.

Nephritis is the medical term for inflammation of the kidneys, from the Greek word 'nephros' meaning kidney. It can be caused by infections, autoimmune conditions, or toxins. The other options are made-up terms - 'Kidneyitis' uses English words, 'tubulitis' would refer to tubules not kidneys, and 'renalitis' mixes Latin and Greek roots incorrectly.

The diameter of a circle or sphere is exactly twice its radius. If Earth's radius is 6370 km, then diameter = 2 × 6370 = 12740 km. Option A (12720) is very close to this calculation. The small difference might be due to rounding or using slightly different values for Earth's average radius.

The thermosphere is the warmest layer of Earth's atmosphere, with temperatures reaching up to 2,500°C due to absorption of intense solar radiation. Despite these high temperatures, the air is so thin that it would feel cold to human skin. The troposphere is where we live and where weather occurs, while the stratosphere contains the ozone layer.

The Sun is primarily composed of hydrogen (about 73% by mass) and helium (about 25% by mass), with trace amounts of heavier elements. These two elements fuel the nuclear fusion reactions in the Sun's core that produce its energy. The notation 'H and He' correctly identifies these two dominant elements.

While the Milky Way's galactic center (which likely hosts a supermassive black hole) has extremely strong gravity, the question's phrasing is problematic. Gravity at the center of a black hole is infinite according to general relativity (singularity), making this a theoretical rather than measurable comparison. Jupiter has the strongest surface gravity of planets in our solar system, but black hole gravity far exceeds anything else.

Mass is an intrinsic property of matter and does not change with location. A 42 kg mass on Earth remains 42 kg on the Moon - only the weight (force of gravity acting on that mass) changes. Weight would be about 1/6th on the Moon (approximately 7 kg force), but mass stays constant at 42 kg.

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.