Physics

The triple point of water is the unique temperature and pressure at which water can coexist in solid, liquid, and gas phases. This temperature is precisely 273.16 K, making option C correct.

A Tokamak is a device used in nuclear fusion research that uses magnetic fields to confine plasma in the shape of a torus, enabling the conditions necessary for fusion reactions.

Plasma is the most abundant form of matter in the universe, making up stars and interstellar matter, far exceeding the amounts of solids, liquids, or gases.

Stars appear to twinkle because their light passes through Earth's turbulent atmosphere, causing the light to refract multiple times and change direction slightly, which makes the stars seem to flicker or twinkle.

The SI unit of dipole moment is coulomb-meter (Cm), which represents the product of charge and distance. Debye is a commonly used unit in chemistry but is not an SI unit. Weber is the SI unit of magnetic flux, and Coulomb is the unit of electric charge.

The observation of merging black holes billions of light-years away led to the first direct detection of gravitational waves, confirming a major prediction of Einstein's general relativity. This discovery opened a new way to observe cosmic events.

Lux is the SI unit of illumination or illuminance, which measures the amount of luminous flux per unit area. It quantifies how much light is received on a surface.

The Curie (Ci) is a unit used to measure radioactivity, specifically the rate of radioactive decay. It is not related to heat, work, energy, or power.

Among the given planets, Mercury has the lowest acceleration due to gravity because it is smaller and less massive compared to Mars, Jupiter, and Neptune. Jupiter and Neptune are gas giants with very high gravity, and Mars has higher gravity than Mercury due to its larger mass.

The Sun's energy is produced by nuclear fusion, where hydrogen nuclei combine to form helium, releasing vast amounts of energy. This process powers the Sun and other stars.