General Science Quiz - Chemistry & Biology

Ozone (O3) is a powerful oxidizing agent used in water treatment to kill bacteria, viruses, and other microorganisms. It is more effective than chlorine for some pathogens and leaves no harmful residues. Oxygen (O2) and carbon dioxide (CO2) are not used for purification, and ammonia (NH3) is sometimes used in water treatment but primarily for pH adjustment, not purification.

Schizophrenia is a chronic mental disorder affecting thinking, feeling, and behavior. It is not a bone disease, brain tumor, or blood cancer. Symptoms include hallucinations, delusions, and disorganized thinking.

Humans require 9 essential amino acids that cannot be synthesized by the body and must be obtained from diet: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. The other numbers are incorrect.

Hematological malignancies are cancers of the blood, bone marrow, and lymph nodes, including leukemia, lymphoma, and myeloma. 'Blood Cancer' is the correct term. It is not an STD, liver dysfunction, or vascular blockage.

Methanol (CH3OH) is historically called 'wood alcohol' because it was originally produced by destructive distillation of wood. It is not fruit alcohol, anesthesia, or 'none of the above'. It is toxic and used as an industrial solvent and fuel.

Hydrocyanic acid (HCN) is highly flammable and volatile, unlike the other common mineral acids listed which are corrosive but not combustible. HCN can form explosive mixtures with air and requires special handling precautions.

An android is specifically defined as a robot designed to look and act like a human. This distinguishes androids from general robots that may have any form or function. Option A describes multi-functional robots, Option B describes autonomous decision-making capability, and Option C is irrelevant to the definition.

Diamonds are formed from carbon (coal is primarily carbon) subjected to extreme heat and pressure over long periods deep within the Earth. This process transforms the carbon atoms into a crystalline structure. Graphite is also carbon but requires different conditions, while obsidian is volcanic glass.

The pistil is the female reproductive part of a flower, consisting of the stigma, style, and ovary. The stamen is the male part, while stem and petal are structural/support parts.

The Achilles tendon connects the calf muscles to the heel bone and is located in the lower leg/ankle region. It is the thickest tendon in the human body and enables walking, running, and jumping.

The chemical symbol for antimony is Sb, derived from its Latin name 'stibium'. Many element symbols come from their Latin names rather than English, which is why antimony uses Sb instead of An. Astatine (At) is a different element entirely, and Sg is seaborgium.

Radon's chemical symbol is Rn, following the standard pattern of taking the first two letters from the element's name. Rd, Ra (radium), and R are not valid symbols for radon. Noble gases like radon typically use this straightforward naming convention.

Strontium's symbol is Sr, taking the first letter and the second consonant. Sn is tin, Sm is samarium, and St is not an official element symbol. The symbol Sr clearly identifies strontium on the periodic table.

Promethium uses the symbol Pm, formed from the first letter and the 'm' sound in the middle. Pr is praseodymium, Pt is platinum, and Th is thorium - all different elements. Promethium is a radioactive lanthanide.

Lead's chemical symbol is Pb, derived from its Latin name 'plumbum'. This is why lead uses Pb instead of Le or Ld. Pd is palladium, another distinct element. Many common elements use symbols based on their Latin names.

Hafnium's symbol is Hf, combining H with the following consonant 'f'. H is hydrogen, Hm is not a valid symbol, and Hn doesn't exist. Hafnium is a transition metal named after Hafnia, the Latin name for Copenhagen.

Dubnium uses the symbol Db, following the pattern of first letter plus next consonant. Du, Dn, and single-letter D are not correct symbols. Dubnium is a synthetic element named after Dubna, Russia, where it was discovered.

Cf is the symbol for californium, named after California where it was first synthesized. The name follows the pattern of many synthetic elements being named after places or scientists. 'Cafium', 'Cefanistrus', and 'Cefinum' are fictional element names.

Mg represents magnesium, taking the first two letters of its name. 'Magnate' is not an element, manganese is Mn, and 'Mitrogen' is fictional. Magnesium is an abundant alkaline earth metal essential for biological processes.