GK (Science)

The Wright brothers (Orville and Wilbur) invented and successfully flew the first powered airplane in 1903. Their pioneering work at Kitty Hawk, North Carolina, established the foundation for modern aviation.

The gravitational pull on the Moon is about 1/6th of Earth's gravity. With weaker gravitational force, a person can jump much higher and further on the lunar surface. This is why astronauts appeared to bounce on the Moon.

Heart patients are typically advised to limit fat intake, especially saturated and trans fats. High fat consumption can lead to increased cholesterol, arterial blockage, and cardiovascular complications. The other options (vitamins, carbohydrates) are generally part of a balanced diet.

Albert Einstein formulated the famous mass-energy equivalence equation E = mc² in 1905 as part of his Special Theory of Relativity. This equation revolutionized physics by showing that mass and energy are interchangeable.

The meter (m) is the SI (International System of Units) base unit for length. The SI system is the modern form of the metric system and provides standardized measurements used globally in science and everyday applications.

The Richter scale is the standard instrument used to measure the intensity or magnitude of earthquakes. It was developed in the 1930s and provides a logarithmic scale to quantify earthquake strength.

A microphone converts sound waves into electrical energy through a diaphragm that vibrates in response to sound pressure, creating an electrical signal. This is the fundamental principle behind audio recording and amplification.

Fathometer instrument is used to measure the depth of oceans.

A lactometer is a specialized instrument used to measure the density and purity of milk. It works on the principle of buoyancy and helps determine if milk has been adulterated with water or other substances.

When our skin is exposed to sunlight (specifically UVB radiation), it produces vitamin D through a photochemical reaction. This is why sun exposure is important for maintaining adequate vitamin D levels in the body.

The decibel (dB) is the standard unit used to measure the intensity of sound. It's a logarithmic unit that expresses the ratio of a physical quantity (usually power or intensity) to a reference level.

A telescope is an optical instrument designed to view distant objects, typically celestial bodies like stars and planets. It uses lenses or mirrors to gather and focus light, making distant objects appear closer and brighter.

An ammeter is specifically designed to measure electric current in a circuit. It is connected in series with the circuit component and measures the flow of electric charge in amperes.

ECG stands for Electro Cardio Gram, which records the electrical activity of the heart over time. It's a diagnostic tool that helps detect heart rhythm problems and other cardiac conditions.

Tobacco naturally contains nicotine, which is a highly addictive stimulant compound. Nicotine is the primary psychoactive ingredient in tobacco products that contributes to addiction.

OPV stands for Oral Polio Vaccine, which is administered orally (through drops) rather than by injection. It's a live attenuated vaccine used to immunize against poliovirus.

Madam Curie (Marie Curie), along with her husband Pierre Curie, discovered radium in 1898. She was a pioneering physicist and chemist who conducted groundbreaking research on radioactivity.

Television was invented by John Logie Baird (JL Baird), who demonstrated the first working television system in 1926. His mechanical television system was a precursor to modern electronic television.

The human body contains approximately 639 muscles, though sources may vary slightly between 639-640 due to anatomical variations and individual differences. The muscular system consists of skeletal, smooth, and cardiac muscles that enable movement, maintain posture, and support bodily functions.

The Celsius and Fahrenheit scales intersect at -40 degrees, meaning -40°C equals -40°F. This can be derived from the conversion formula C = (F - 32) × 5/9. Setting C = F and solving gives the unique intersection point.

U is the chemical symbol for Uranium, a radioactive element used in nuclear fuel and weapons. Chemical symbols are standardized internationally by IUPAC, with U representing this element on the periodic table.

Urea (CO(NH2)2) is a nitrogen-containing compound produced in the liver as a waste product of protein metabolism. It is the primary source of nitrogen excretion in mammals and contains approximately 46.7% nitrogen by mass.

Sn is the chemical symbol for Tin, derived from its Latin name 'Stannum'. Tin is a post-transition metal in group 14 of the periodic table, commonly used in soldering and coating other metals to prevent corrosion.

Digestion begins in the mouth through both mechanical breakdown by teeth and chemical action of salivary amylase enzyme on starches. This is the first stage of the digestive process before food moves to the stomach and intestines.

K is the chemical symbol for Potassium, derived from its Latin name 'Kalium'. Potassium is an alkali metal in group 1 of the periodic table, essential for nerve function and maintaining fluid balance in living organisms.