Physics

Magma is molten rocks beneath the earth’s crust. Hot springs are heated geothermally by underlying magma.

Most heating elements use Nichrome 80/20 (80% nickel, 20% chromium) wire, ribbon, or strip. Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time. Material beneath this layer will not oxidize, preventing the wire from breaking or burning out._x000D_ Hence, Nichrome is used as heating elements.

A fluid with large viscosity hinders motion because its molecular makeup gives it a lot of internal friction. Oil is the most viscous amongst all the option.

If we connect many appliances to the same socket, requirement of current for that socket will increase, the wire connected to that socket will have to supply more current, that may exceed its current rating and can damage it.

Railway tracks are banked at the curves so that the necessary centripetal force may be obtained from the horizontal component of the reaction on the train.

Dioptere is the unit of power of a lens.

The device used for measuring the wavelength of X-rays is Bragg Spectrometer.

Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air.

Ocean currents are an example of convection.

SI unit of force is Newton.