Science and Technology General Knowledge Quiz

Stainless steel is primarily an alloy of iron (Fe) and carbon (C), with chromium and nickel as key additional elements that provide corrosion resistance. The chromium content (typically 10.5% or more) creates a protective oxide layer, while nickel enhances strength and corrosion resistance. Aluminum, tin, copper, zinc, lead, and magnesium are not primary components of standard stainless steel.

Mixing bleach and ammonia produces chloramine gas, which is highly toxic and can cause serious respiratory damage or death. This is a critical safety rule. Vinegar and baking soda react safely (just CO2 and water), bleach and water is proper dilution practice, and oil/water not mixing is harmless - they're just immiscible.

Aluminum compounds (typically aluminum chlorohydrate or aluminum zirconium) are the active sweat-blocking ingredients in antiperspirants. They work by forming temporary plugs in sweat ducts. Calcium, magnesium, and tin compounds are not used for this purpose in antiperspirants.

Sulfuric acid (H2SO4) is the acid used in lead-acid car batteries and was historically known as 'Oil of Vitriol'. It's a strong diprotic acid. Acetic acid is vinegar, hydrochloric acid is stomach acid and muriatic acid, and nitric acid is used in fertilizers and explosives - none are used in car batteries.

Vitamin C is chemically known as ascorbic acid (C6H8O6). It is an essential nutrient for humans and acts as an antioxidant. Citric acid gives citrus fruits their sour taste but is not Vitamin C. Salicylic acid is used in acne treatments and aspirin synthesis. Tricarboxylic acid refers to the citric acid cycle, not a specific single acid.

Carbonic acid (H2CO3) is formed when carbon dioxide dissolves in water, creating the characteristic fizz or bubbles in soft drinks. Ascorbic acid is Vitamin C sometimes added as a preservative. Citric acid adds tart flavor. Phosphoric acid is used in colas for tartness but doesn't produce the fizz itself.

Sodium hydroxide (NaOH), also known as lye or caustic soda, is a key ingredient in traditional soap-making through saponification - reacting with fats/oils to produce soap. Potassium hydroxide is used for liquid soaps. Sodium chloride is table salt. Calcium carbonate is not involved in soap production.

Thimerosal (spelled thimerosol in the question) is an organomercury compound containing approximately 49% mercury by weight. It was widely used as a preservative in vaccines and other medical products. Iron, cadmium, and silver are not components of thimerosal.

Ajay Bhatt is the co-inventor of USB (Universal Serial Bus) along with his team at Intel. He appeared in Intel's 'Sponsors of Tomorrow' campaign highlighting his contributions to computing technology. The other options (Ajay Chawla, Ajoy Mukherjee, Ajay Devgan - the actor) are not the correct USB co-inventor.

BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene) are antioxidants specifically added to fats and oils in foods to prevent oxidation. Oxidation causes fats to become rancid, developing off-flavors and odors. These compounds work by interrupting the free-radical chain reactions that cause lipid breakdown. They do not affect sugars, colors, or artificial sweeteners.

Fructose is a natural sugar found in fruits, honey, and some vegetables. It is not chemically synthesized like artificial sweeteners. Acesulfame potassium, aspartame, and sucralose are all artificial sweeteners created through chemical synthesis to provide sweetness without calories. The question asks which one is NOT artificial, making fructose the correct choice.

Red ants inject formic acid (methanoic acid, HCOOH) when they sting, causing the characteristic burning sensation. Formic acid is named after the Latin word for ant, 'formica.' Ascorbic acid is vitamin C, glutamic acid is an amino acid involved in umami taste, and hydrochloric acid is found in gastric juice.

McCaslin was the code name for Intel's Ultra Mobile Platform 2007, designed for ultra-mobile PCs and mobile internet devices. It was part of Intel's strategy for low-power, portable computing platforms before the Atom brand was fully established. The other options refer to other Intel projects or tools but are incorrect.

Silicon dioxide (SiO2) is the fundamental compound used as the base material for manufacturing all integrated circuits (ICs). It serves as an excellent insulator and is the primary material in semiconductor wafers.

The modern decimal system with place value and zero was indeed developed by ancient Indian mathematicians. While the Indus Valley Civilization had advanced mathematics, the fully developed decimal system emerged during the classical period of Indian mathematics.

The Inca Civilization used quipu - a system of knotted strings - for recording numbers and keeping records. This was their primary method of numerical record-keeping since they did not have a written language.

The ancient Egyptians created the first known written numerals on papyrus. They developed a hierarchical decimal numeral system that they used extensively in administration and record-keeping.

System On Chip (SoC) is the computer architecture where all components of a computer system are integrated onto a single chip. This is the awaited future architecture that represents the ultimate miniaturization of computing systems.

Vitamin A deficiency causes retardation of growth in children. Vitamin A is essential for normal growth and development, and its deficiency leads to stunted growth and other developmental issues.

Around 3000 BC, both Babylonians and Egyptians began using advanced mathematics including arithmetic, algebra and geometry for practical purposes like taxation, construction and astronomy. This marked a significant advancement beyond basic counting and measurement.