Everyday Science

The process of crushing kidney stones using shock waves is called lithotripsy. Laparoscopy is a surgical technique, dementia is a neurological condition, and 'None of these' is incorrect.

Vitamin C is absent in cheese, milk, and rice, so none of these foods contain vitamin C. Therefore, the correct answer is 'None of these' as all listed foods lack vitamin C.

A solid is a state of matter that has a definite shape and volume because its particles are closely packed in a fixed arrangement, unlike liquids and gases which do not have a fixed shape.

The term "white coal" is a traditional nickname for hydroelectric power because it harnesses the energy of flowing water, similar to how coal is used for energy, but without pollution. Hence, hydroelectricity is correctly referred to as "white coal."

The Earth's movement around the Sun, known as its revolution, causes the changing angle of sunlight and length of days, which results in the different seasons throughout the year.

The heat from the sun reaches the earth primarily through radiation, as it travels through the vacuum of space without the need for a medium. Convection and conduction require a medium and cannot occur in space.

Gold is known for its non-toxic nature and biocompatibility, which is why it is often used in medical implants and dental work. Other metals like silver, iron, and copper can be toxic in certain forms or concentrations.

LPG (Liquefied Petroleum Gas) mainly consists of propane and butane, with butane being a major constituent. Methane and ethane are more common in natural gas, and hydrogen is not a component of LPG.

Magnesium is commonly extracted from seawater because it is abundant in dissolved form as magnesium chloride. Potassium and aluminum are not typically extracted from seawater on a commercial scale.

Golden rice is genetically engineered to produce beta-carotene, a precursor of vitamin A, to help combat vitamin A deficiency. Therefore, it contains the highest quantity of vitamin A compared to other vitamins listed.