Everyday Science

Diamond is an allotrope of carbon, meaning it is composed entirely of carbon atoms arranged in a crystal lattice, which makes it a single-element substance. Therefore, the correct answer is Carbon.

Lactobacillus is a genus of bacteria used in the fermentation process to make yogurt by converting lactose into lactic acid, which thickens the milk and gives yogurt its characteristic tangy flavor. The other bacteria listed do not play a role in yogurt production and can be harmful.

Biotechnology plays a significant role in food production primarily through fermentation, which is used to produce products like yogurt, cheese, and alcoholic beverages by utilizing microorganisms to transform raw materials.

Rectified spirit is a highly concentrated ethanol solution, typically containing about 95% alcohol by volume. This high purity is achieved through repeated distillation, making option B correct.

Dry ice is the solid form of carbon dioxide (CO2). It sublimates directly from solid to gas at temperatures below -78.5°C, making it commonly used as a cooling agent.

Carrots are rich in beta-carotene, which the body converts into Vitamin A. This vitamin is essential for good vision and immune function, making Vitamin A the correct answer.

Seafoods are rich sources of iodine, an essential mineral important for thyroid function. Other options like green leafy vegetables, seeds, and fresh vegetables and fruits generally contain very low amounts of iodine.

The energy value of food is commonly measured in calories, which quantify the amount of energy released when food is metabolized. Joules are also a unit of energy but calories are more traditionally used in nutrition. Tesla is a unit of magnetic field strength, and proteins are nutrients, not energy units.

A hygrometer is an instrument specifically designed to measure the humidity or moisture content in the air, making option C the correct answer.

Orion is widely regarded as one of the most splendid and magnificent constellations due to its bright stars and distinctive shape, making it easily recognizable in the night sky.

GPS stands for Global Positioning System, which is a satellite-based navigation system used to determine precise locations on Earth.

Zinc deficiency is known to cause loss of appetite and poor growth, as zinc is essential for normal growth and development. Deficiencies in iodine, copper, or iron cause other specific symptoms but are not primarily associated with loss of appetite and poor growth.

The common mineral salt present in sweat is sodium chloride, which is essentially table salt. Sweat contains water and dissolved salts, primarily sodium chloride, which helps regulate body temperature and electrolyte balance.

Injection of heroin involves using needles, which can transmit HIV if needles are shared, making it the drug abuse form with the highest risk of HIV infection among the options.

Dry ice is the solid form of carbon dioxide (CO2). It sublimates directly from solid to gas at -78.5°C without becoming liquid, which is why it is commonly used as a cooling agent.

Vitamin C is abundantly found in fresh vegetables and fruits, making option C the correct answer. Green leafy vegetables contain some vitamin C but generally less than fruits like oranges and lemons. Seeds and seafood are not significant sources of vitamin C.

The World Health Organization recommends a balanced diet with approximately 55-75% carbohydrates, 10-15% proteins, and 15-30% fats. Option A (Carbohydrates 58% + Proteins 12% + Fats 30%) fits within these recommended ranges, making it the correct choice.

Natural fats and oils are triglycerides composed primarily of carbon, hydrogen, and oxygen atoms. They do not contain nitrogen, so option A is correct.

Sea water freezes last because it contains salt, which lowers its freezing point compared to fresh water sources like rivers, canals, and lakes.

Nutrients are generally classified into six main types: carbohydrates, proteins, fats, vitamins, minerals, and water. Therefore, the options 1, 2, or 3 are incorrect, and 'None of These' is the closest correct answer among the given choices.

Poplar is a common woody raw material used in the manufacture of paper pulp due to its suitable fiber characteristics. Cotton is a non-woody fiber, bagasse is a fibrous residue from sugarcane, and rice straw is an agricultural residue, not woody materials.

The three primary nutrients essential for healthy plant growth are Nitrogen (N), Phosphorus (P), and Potassium (K). These elements support vital functions such as leaf growth, root development, and overall plant health.

Aristotle is considered the founder of meteorology because he wrote 'Meteorologica,' one of the earliest comprehensive works on weather and atmospheric phenomena.

A pyrometer is an instrument specifically designed to measure very high temperatures, often in industrial settings. The other options measure different parameters: a manometer measures pressure, a thermostat regulates temperature, and a chronometer measures time.

Meteorology is the scientific study of the atmosphere, including weather processes and forecasting. Therefore, option B, 'Atmosphere,' is the correct answer.