Everyday Science

The chemical symbol for Tungsten is 'W', derived from its alternative name 'Wolfram'. This is the standard symbol used in the periodic table.

Beriberi is caused by a deficiency of thiamine (vitamin B1), which is commonly lost when rice is milled, removing the husk where the vitamin is concentrated. Hence, the use of milled rice leads to beriberi.

Authoritative nutrition sources such as Eat This Much, FatSecret, FoodStruct, and CalZen consistently report that natural honey contains approximately 304 Calories per 100 grams. This confirms that the correct answer is 'C' (304 Calories). The original question had a mismatch between the correct answer and explanation; the correct answer should be 'C' to match the factual calorie content of honey.

Annealing is the process of heating steel to a temperature below red heat and then cooling it slowly to soften the metal and improve its ductility. This matches the description given in the question, making option A correct.

The scientific study of fingerprints is known as dactylography, which involves analyzing fingerprint patterns for identification purposes. The other options refer to different fields: dactylology is sign language study, dactyliology is not a recognized term, and dialectology is the study of dialects.

Biogas primarily consists of methane (CH4), which is the main combustible component responsible for its energy content. Other gases like carbon dioxide are present but in smaller amounts, and oxygen is typically absent in biogas.

Oil rises up the wick in a lamp due to capillary action, which is the ability of a liquid to flow in narrow spaces without external forces. This phenomenon allows the oil to move upward against gravity through the tiny pores of the wick.

A stethoscope is a medical instrument used by healthcare professionals to listen to the internal sounds of the body, particularly the heart and lungs. Other options like stereoscope, oscillator, and oncolator are unrelated to this function.

Pig iron is the intermediate product of smelting iron ore with a high-carbon fuel such as coke, and it is commonly referred to as cast iron due to its high carbon content and brittleness. Therefore, 'Cast iron' is the correct answer.

Day and night occur because the Earth rotates around its own axis, causing different parts of the Earth to face the Sun or move away from it, resulting in daylight and darkness respectively.

Deficiency diseases occur when the body lacks essential nutrients, particularly vitamins, which are crucial for various bodily functions. Lack of vitamins leads to specific deficiency diseases such as scurvy (vitamin C deficiency) and rickets (vitamin D deficiency).

Sodium stearate is a common component of soap, formed by the saponification of stearic acid with sodium hydroxide. The other options are salts but are not components of soap.

A chronometer is a precise instrument used to measure time, especially in navigation and scientific contexts. Therefore, the correct answer is 'Time'.

The human heart has four chambers: two atria and two ventricles. This structure allows for efficient circulation of oxygenated and deoxygenated blood.

The stethoscope was invented by René Laennec in 1816, making option A the correct answer. The other options are inventors of different technologies unrelated to the stethoscope.

Argon is the third most common gas in Earth's atmosphere after nitrogen and oxygen, making it the correct answer. Carbon dioxide is present in much smaller amounts, and hydrogen and neon are trace gases.

Gun metal is a type of bronze alloy traditionally composed of copper, tin, and zinc. This combination provides good corrosion resistance and strength, making option D correct.

Turpentine is a fluid obtained by distilling resin from pine trees, making the pine tree the correct source. Other trees listed do not produce turpentine.

A fathom is a unit of length used especially for measuring the depth of water. It is equal to 6 feet or approximately 1.8 meters, making it the correct unit for measuring depth.

Electric bulbs are usually filled with inert gases like nitrogen or argon to prevent the filament from oxidizing and to prolong its life. Among the given options, nitrogen is the most commonly used gas in electric bulbs.

Vitamin B2 is commonly known as Riboflavin. The other options correspond to different vitamins: Thiamine is Vitamin B1, Ascorbic Acid is Vitamin C, and Niacin is Vitamin B3.

Each gram of carbohydrate provides approximately 4 calories of energy, which is a standard nutritional fact used in dietary calculations.

One yard is equal to exactly 3 feet. This is a standard unit conversion in measurement.

Vitamin B3 is commonly known as Niacin, which is essential for energy metabolism and DNA repair. The other options correspond to different vitamins: Thiamine is B1, Riboflavin is B2, and Retinol is Vitamin A.

When the air temperature is above the freezing point of water (0°C or 32°F), precipitation falls as rain because the water droplets remain liquid. Other forms like hail or snow require colder temperatures.