Everyday Science

The accumulation of salts in the kidneys leads to the formation of kidney stones, which are hard deposits made of minerals and salts. This condition is known as kidney stones, making option D the correct answer.

Casimir Funk is credited with coining the term 'vitamine' and discovering vitamins as essential nutrients, making him the correct answer.

Milk typically has a pH around 6.5 to 6.7, making it slightly acidic. This slight acidity is due to the presence of lactic acid and other organic acids in milk.

Molasses is a thick syrup that is a byproduct of the sugar manufacturing process, obtained after sugar crystals are extracted from sugarcane or sugar beet juice.

Ordinary mobile phones communicate using radio waves, which are a type of electromagnetic wave suitable for wireless communication over distances. Sound waves, infrared waves, and UV waves are not used for mobile phone communication.

The troposphere is the lowest layer of the atmosphere, lying closest to the Earth's surface where weather phenomena occur. The other layers are positioned above it in the order: stratosphere, mesosphere, and thermosphere.

The tree that sends down roots from its branches to the soil is the Banyan tree. These aerial roots grow downward and help support the large branches, a characteristic feature of Banyan trees.

Hen and chicken disorder is a physiological disorder that affects tomatoes, causing the fruit to develop unevenly with some parts ripening earlier than others, resembling a 'hen and chicken' appearance.

Bt seed refers to genetically modified seeds that produce Bacillus thuringiensis toxin, which is commonly used in cotton to protect against bollworm pests. Therefore, Bt seed is associated with cotton.

Animal wastes are commonly used for biogas generation because they contain organic matter that decomposes anaerobically to produce methane-rich biogas. Forest residues and aquatic plants are less commonly used for this purpose, and 'None of these' is incorrect.

Night vision devices commonly use infrared waves because these waves are emitted as heat by objects and can be detected even in low light conditions, allowing the apparatus to create a visible image.

One kilogram is equal to approximately 35.274 ounces. This is based on the exact conversion where one ounce is defined as 28.349523125 grams, so 1 kilogram (1000 grams) divided by 28.349523125 grams per ounce equals about 35.274 ounces. Therefore, option D (35) is the closest and correct answer among the given options.

Nitrogen makes up about 78% of the Earth's atmosphere, making it the most abundant element. Oxygen is the second most abundant at about 21%, while hydrogen and nickel are present only in trace amounts or not at all in the atmosphere.

An ombrometer is the instrument used to measure the amount of rainfall, making it the correct answer for the instrument of a rain gauge.

The freezing point of water on the Fahrenheit scale is 32 °F, which is the temperature at which water changes from liquid to solid under standard atmospheric conditions.

Among the given options, a skunk is the smallest animal in terms of body size. Gorillas and tigers are much larger mammals, while cats are generally larger than skunks.

The process of making soap by reacting fats or oils with a strong base (usually sodium hydroxide) is called saponification. This chemical reaction produces soap and glycerol.

As one moves from the equator towards the poles, the difference in the duration of day and night increases due to the tilt of the Earth's axis, causing longer days in summer and longer nights in winter at higher latitudes.

MRI machines use strong magnetic fields and radio waves to generate images of the body's internal structures. Among the options, only magnetic waves are relevant to MRI technology.

Blood appears red because of haemoglobin, a protein in red blood cells that binds oxygen and contains iron, which gives blood its red color.

Car headlamps use parabolic concave mirrors because they can focus light rays into a parallel beam, providing a strong and directed light for better visibility.

The face typically shows signs of aging earlier than other body parts due to constant exposure to environmental factors like sunlight and pollution, as well as frequent muscle movements. Therefore, the face is generally considered the first body part to show aging.

Samuel Hahnemann is recognized as the founder or 'Father of Homeopathy' because he developed the principles and practice of homeopathy in the late 18th century.

Lignite, bituminous, and anthracite are all ranks of coal, representing different stages of coal formation based on carbon content and heat exposure.

Helium is commonly used in balloons and airships because it is a lighter-than-air, non-flammable gas, making it safer than hydrogen. Carbon and chlorine are not used for this purpose.