Science and Technology Fundamentals

Killed spirits is zinc chloride (ZnCl2), named so because it 'kills' (dissolves) metals and is highly corrosive. It's used as a flux for soldering, in wood preservation, and in textile processing. Titanium chloride, ferric chloride, and lead sulfate are different compounds with different uses.

Aluminum acetate solution is known as 'RED LIQUOR' in certain industrial and dyeing contexts, appearing reddish-brown when concentrated. The color comes from the aluminum ions in solution. White, blue, or green are incorrect descriptions of aluminum acetate's actual appearance in solution.

Vinegar is essentially impure dilute acetic acid, containing around 5-8% acetic acid in water along with other compounds that give it its characteristic flavor and aroma. It's not pure acetic acid, and it's definitely not methanoic (formic) acid. Option C correctly captures both the dilute and impure nature of vinegar.

White vitriol is the historical name for zinc sulfate crystals (ZnSO4·7H2O), which are white and crystalline in appearance. It's not zinc nitrite, calcium sulfate, or lead sulfate - those are different chemical compounds with different properties and uses.

Indian red is ferric oxide (Fe2O3), a naturally occurring red pigment used in paints and dyes. It's not zinc sulfate, ferrous oxide (FeO), or aluminum sulfate - those are completely different compounds. The red color comes from the iron in the +3 oxidation state.

Lunar caustic is the historical name for silver nitrate (AgNO3), named for its caustic properties and silver-white, moon-like appearance when solid. It was historically used for cauterizing wounds. It's not gold nitrate, silver nitrite, or gold nitrite - those are different compounds.

Ethylene glycol is the primary component in most automotive antifreeze formulations due to its low freezing point and high boiling point. It's not ethyl alcohol (which has a higher freezing point), methyl isocyanate (a toxic gas), or phenol (a different compound entirely).

Black lead is the historical name for graphite, a form of carbon used in pencils and lubricants. It's not elemental carbon in general, mercury, or zinc - it's specifically the layered carbon structure we call graphite. The name 'black lead' comes from its appearance, not its actual composition.

Thomas Alva Edison invented the phonograph in 1877, becoming the first device to record and reproduce sound. Farnsworth invented television, Franklin discovered electricity principles, Galileo was an astronomer. The phonograph was Edison's breakthrough invention.

Galileo Galilei invented the thermoscope, an early prototype of the thermometer, around 1593. His device used the expansion and contraction of air to show temperature changes. James Gregory was a mathematician/astronomer, Benjamin Franklin was a statesman/scientist who studied electricity, and Robert Hutchings Goddard was a rocket pioneer.

Thomas Alva Edison invented the electric light bulb in 1879 and patented it in 1880. The steam engine was developed by Newcomen and later improved by Watt, the telescope was invented by Hans Lippershey, and the telephone was invented by Alexander Graham Bell.

Roentgen discovered X-rays in 1895, not the steam engine. The steam engine was developed by Thomas Newcomen (1712) and significantly improved by James Watt (1760s). Therefore, the statement 'Roentgen discovered steam engine' is false.

iRobot is indeed a company that manufactures household robots, most notably the Roomba robotic vacuum cleaner. The statement is factually correct.

In Windows Vista, the Alt+Tab key combination does access Windows Aero, displaying the 3D flip view of open windows. This is a correct statement.

The Large Hadron Collider accelerates protons and heavy ions, not positrons (anti-electrons). It collides particles traveling in opposite directions in its circular underground tunnel.

Chandrayaan-1 was launched aboard PSLV-XL, not GSLV-III. GSLV Mk III (now called LVM3) was developed years later and first flew in 2014.

Electromagnetic radiation includes Radio waves, Visible Light, and Gamma rays across the spectrum. Alpha and Beta are particle radiation (not EM waves), and Supersonic refers to sound speed.

Bluetooth, GSM, and IEEE 802.11 (WiFi) are all wireless communication standards. TokenRing is wired networking, ATM is a cell-switching protocol, and WAP is a protocol for mobile web access (not a wireless tech itself).

A turboprop is NOT a jet engine - it's a gas turbine engine that drives a propeller. Jet engines produce thrust through exhaust gases, while turboprops produce thrust primarily through the propeller.

Wind kites and tidal generators are renewable energy sources. CNG (fossil fuel), fuel cells (require fuel input), biogas (organic but not typically classified as renewable in this context), and jatropha (biofuel crop, not a direct energy source) are not classified as renewable energy in the same category.