General Science Mixed Practice — MCQs with Answers (Set 7)

Herpetology covers both amphibians and reptiles, making it the correct branch for frogs and salamanders.

Since a single cell divides rather than enlarging indefinitely, cell counting under a microscope tracks unicellular growth.

CNG burns with minimal sulphur and nitrogen oxide output, contributing to lower overall pollution and reduced greenhouse gas emissions.

Aspirin functions as an analgesic and antipyretic, not as an anaesthetic, making this particular pairing incorrect.

Antipyretic is the specific medical term reserved for drugs whose primary action is reducing fever.

Paracetamol reduces both fever and pain, making it one of the most widely used dual-action over-the-counter drugs.

Salicin, aspirin’s chemical ancestor, was extracted from willow tree bark long before synthetic aspirin was developed.

DDT was developed and widely used as an insecticide, or pesticide, before its environmental persistence became a major concern.

Treating sewage before release prevents water pollution, unlike the other options, which all cause their own forms of environmental harm.

Bacterial digestion of garbage yields methane for power generation, and electrolytic processing offers another route to extract usable energy.

Radioactive decay releases alpha particles, beta particles, and gamma rays, not the electromagnetic radio, infrared, or ultraviolet waves.

India’s National Air Quality Index tracks pollutants like sulphur dioxide, nitrogen dioxide, and lead, but methane is not one of its tracked parameters.

Anthracite’s high carbon content and low volatile matter let it burn cleanly with minimal smoke, unlike the lower-grade coals.

Sulphur dioxide and carbon monoxide are released directly from their sources, making them classic primary pollutants.

Phthalates, used as plasticisers in many flexible plastics, are a toxic substance of concern associated with polymer products.

Polycot, polywool, and terrycot are all polyester blend fabrics, combining polyester with cotton, wool, or terry cloth respectively.

Polyester’s synthetic fibre structure resists creasing far better than natural fabrics like cotton, flax, or silk.

Terylene is a fully synthetic polyester fibre, unlike jute, flax, and wool, which all come from natural plant or animal sources.

Natural rubber consists of isoprene units, and raw latex is processed into solid rubber through coagulation.

Teflon’s extremely low surface friction and chemical inertness make it the standard non-stick coating for cookware.

Glucose reduces Fehling’s solution to give a reddish precipitate, while non-reducing cane sugar does not react the same way.

LSD produces vivid, dream-like hallucinations, placing it firmly in the category of powerful hallucinogenic drugs.

Chloropicrin’s strong irritant effect on the eyes has made it historically used as a tear gas and soil fumigant.