Everyday Science

Rayon is a synthetic fiber made from regenerated cellulose and is commonly known as artificial silk due to its silk-like appearance and texture. Nylon and Terylene are synthetic fibers but do not resemble silk, and cotton is a natural fiber.

Vitamin B complex includes several vitamins (B1, B2, B3, B5, B6, B7, B9, B12) found in a variety of foods. Seafood is a rich source of many B vitamins, especially B12. However, other B vitamins are also found in fruits, vegetables, seeds, legumes, dairy, meat, and fortified cereals. While seafood is an excellent source of vitamin B12, other B vitamins are widely distributed in plant and animal foods. Thus, seafood is a correct and primary source of vitamin B complex, particularly B12, but other options also contain some B vitamins. The question's answer 'A' (Sea Foods) is correct as the best single choice among the options given.

Nichrome is commonly used as the heating element in electric heaters because it has high electrical resistance and can withstand high temperatures without oxidizing quickly. Tungsten and graphite are used in other applications, while chromium alone is not typically used as a heating element.

The summer solstice is the day of the year with the longest period of daylight, marking the longest day and shortest night of the year in a given hemisphere.

Cabbage contains sulfur compounds such as glucosinolates, which are responsible for its characteristic smell and health benefits. The other vegetables listed do not notably contain sulfur.

Iodised salt contains potassium iodide or potassium iodate, which are iodine salts of the metal potassium. This is done to prevent iodine deficiency disorders.

UPS stands for Uninterruptible Power Supply, a device that provides backup power to electronic devices during power outages, which is why it is widely used in households.

There are 24 standard time zones in the world, each generally corresponding to one hour difference in time, covering the 24 hours of the day.

The density of milk typically ranges around 1.03 to 1.04 g/cm³ depending on fat content and temperature. Among the given options, 1.034 g/cm³ is the most accurate average value for milk density.

Tocopherol is the chemical name for vitamin E, which is a fat-soluble antioxidant important for protecting cell membranes from oxidative damage.