General Science and Technology Quiz

Wolfram is the German name for tungsten (symbol W), the metal used in incandescent bulb filaments. Tungsten has the highest melting point of all metals (3422°C), allowing it to withstand the high temperatures needed to produce visible light without melting. Carbon and copper are not used for this purpose.

Nitrous oxide (N2O) is commonly called laughing gas because it produces euphoria and giggling when inhaled. It has been used as an anesthetic in dentistry and medicine since the 19th century. The other options are different nitrogen oxides or carbon compounds - nitrogen dioxide (NO2) is a brown toxic gas, nitrogen monoxide (NO) is nitric oxide, and carbon monoxide (CO) is a poisonous gas.

Liquid flow in a pipeline depends on multiple factors including pipe diameter (larger diameter = more flow for given pressure), flow conditions (velocity, pressure, laminar vs turbulent flow), and pipe smoothness (affects friction losses). All three factors work together to determine the actual flow rate, making 'All of the above' the correct answer.

According to the formula for linear thermal expansion (ΔL = α × L × ΔT), the change in length (ΔL) is directly proportional to the original length (L) of the pipeline. This means longer pipelines will experience more total expansion and contraction than shorter ones for the same temperature change, all else being equal. The coefficient of thermal expansion (α) is a material property.

This is an exact duplicate of question 91564. The correct answer remains that thermal expansion is directly proportional to length (L). According to the linear thermal expansion formula ΔL = α × L × ΔT, longer pipelines expand and contract more than shorter ones for the same temperature change. This question should be flagged as a duplicate.

Heat tracing is an active heating method that maintains temperatures in pipelines above freezing point. It prevents ice formation that could block flow or rupture pipes. Carbonizing (D) refers to carbon deposition, while expansion (A) and clustering (B) are unrelated to thermal protection.

Ampere (2) discovered the relationship between electricity and magnetism. Foucault (3) measured the velocity of light. Hertz (4) discovered radio waves. Neils Bohr (1) proposed the atomic structure. Option C correctly matches a-2, b-3, c-4, d-1.

Fuel cells generate electricity through electrochemical reactions, producing only water and heat as byproducts. This clean, efficient power source is ideal for spacecraft where weight and emissions matter. Aircraft (A) and submarines (D) typically use other power sources.

Biodiesel is produced from vegetable oils and animal fats, primarily from oilseed plants. Jatropha (D) is a major biodiesel source, though the option spells it as 'Iatropha' - this appears to be a typo for Jatropha. Ethyl alcohol (A), cellulose (B), and bagasse (C) are not biodiesel feedstocks.

Taxol (paclitaxel) is an anti-cancer drug originally extracted from the bark of Pacific yew (Taxus brevifolia), a gymnosperm. Bryophytes (A), pteridophytes (C), and lichens (D) do not produce Taxol.

Botryococcus (C) is a green alga known for producing long-chain hydrocarbons, making it promising for biofuel production. Gracilaria (A), Chlorella (B), and Sargassum (D) are algae but not primarily hydrocarbon producers.

The Biological Diversity Act was enacted by the Indian Parliament in 2002 and came into force in 2003. It aims to conserve biological diversity, ensure sustainable use, and fair benefit sharing from biological resources. 1992 (B) is the Rio Convention year, 1997 (C) and 1967 (D) are unrelated.

World AIDS Day has been observed on December 1st every year since 1988. It was the first-ever global health day and is dedicated to raising awareness about the AIDS pandemic caused by HIV infection. The date was chosen to maximize media coverage.