Science General Knowledge

Biology is the scientific study of life and living organisms, encompassing all plants, animals, and microorganisms. It does not focus exclusively on one type of living thing - the scope includes all life forms.

Limnology is the scientific study of inland aquatic ecosystems, primarily lakes and ponds, including their physical, chemical, and biological properties. Biology studies all living things, dermatology treats skin conditions, and linology is not a recognized scientific term.

Zn is the standard chemical symbol for zinc, derived from its German name 'Zink'. Zirconium uses Zr, helium is He, and hydrazine sulfate is a compound, not an element with a single symbol.

A lactometer is a specialized hygrometer used to measure the density and purity of milk. Barometers measure atmospheric pressure, manometers measure pressure of fluids, and thermoscopes detect temperature changes.

Ni is the chemical symbol for nickel, a transition metal used in coins, stainless steel, and batteries. Nitrogen is N, phosphorus is P, and camphor is an organic compound, not an element.

Ra is the chemical symbol for radium, a radioactive alkaline earth metal discovered by Marie and Pierre Curie. R is not used alone, Re is rhenium, and Rn is radon - a different radioactive element.

Jaundice is caused by liver dysfunction when bilirubin builds up in the blood, leading to yellowing of skin and eyes. The liver is responsible for processing bilirubin - when it fails, jaundice occurs. The heart, brain, and eyes may show symptoms but are not the primary affected organ.

H2SO4 is the chemical formula for sulphuric acid, a strong mineral acid. Hydrochloric acid is HCl, nitric acid is HNO3, and benzoic acid is C7H6O2.

Chloroform has the chemical formula CHCl3, containing one carbon, one hydrogen, and three chlorine atoms. CH2Cl is incomplete, CHCl5 is chemically impossible (carbon can only form 4 bonds), and CO2 is carbon dioxide.

Copper is a metal with excellent electrical conductivity. Nitrogen, Sulphur, and Selenium are all non-metals found on the right side of the periodic table.

Carbon (C) is a non-metal found in group 14. Barium (Ba), Copper (Cu), and Cobalt (Co) are all metals, with Barium being an alkali earth metal and Copper/Cobalt being transition metals.

Tear gas is commonly used by law enforcement for crowd control during riots. Laughing gas (nitrous oxide) is used as an anesthetic, neon gas is in lighting, and marsh gas (methane) occurs naturally in swamps.

A is one of the major blood groups in the ABO blood typing system. The other major types are B, AB, and O. H, N, and P are not standard blood group designations.

Deuterium oxide (D2O) is called heavy water because deuterium is an isotope of hydrogen with twice the mass. Regular water is H2O, and light water is not a standard term.

AgNO3 is silver nitrate, used in photography and medicine. Silver phosphate would be Ag3PO4, silver chloride is AgCl, and none of these is incorrect since B is right.

Rb is the chemical symbol for Rubidium, an alkali metal in group 1. Rhodium is Rh, Radium is Ra, and none of these is incorrect since B is right.

Sulfur (S) is a non-metal in group 16. It is not a metal, and while some sources may call it a metalloid, standard classification places it firmly as a non-metal based on its properties.

Biology is the branch of science dedicated to the study of living organisms, including animals. Astrology is a pseudoscience, not a scientific branch. 'Physic' is a misspelling of Physics, which studies matter and energy. Botany specifically studies plants, not animals.

Lactic acid is naturally found in milk and dairy products. It is produced through bacterial fermentation of lactose (milk sugar). Tea, coffee, and Vitamin C do not contain lactic acid.

POP commonly stands for Plaster of Paris, a widely used building material made from gypsum. It is called 'Plaster of Paris' because large gypsum deposits were historically found near Paris, France.

National highway signboards in India are made of retro-reflective sheeting materials that reflect light back to its source, making them visible at night. They are not made of gases like neon, hydrogen, or freon, making 'none of these' the correct answer.

Jonas Salk developed the inactivated polio vaccine (IPV) in 1955. While the option lists 'J. Salk,' his full name was Jonas Salk, so this refers to the same person. Albert Sabin developed the oral polio vaccine (OPV) later.