Physics Quiz 2

When sunlight incident on raindrops formation of a Rainbow occurs in the sky. These raindrops work as a prism. When sunlight hits a raindrop, some of the light is reflected. The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle. Thus, spectrum is separated, producing a rainbow.

Metals are good conductors of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely.

Bats produce echolocation by emitting ultrasound waves through their mouth or nose and listening to the echo. With this echo, the bat can determine the size, shape and texture of objects in its environment.

The freezing and melting point of water is 0°C. The liquid form of water starts to become solid (ice) and solid (ice) starts to become liquid (water) at this temperature. Hence, at 0°C water exists in both liquid (water) and solid (ice) states.

The principle involved in a refrigerator is the rapid absorption of heat by the rapid evaporation of a volatile liquid. Refrigerators use a liquid that evaporates very easily, and this evaporation creates a cooling effect. They then compress the gas into a liquid again, and the whole process starts over.

Mesons are hadronic subatomic particles composed of an equal number of quarks and antiquarks, usually one of each, bound together by strong interactions. Outside the nucleus, mesons appear in nature only as short-lived products of very high-energy collisions between particles made of quarks, such as cosmic rays (high-energy protons and neutrons) and baryonic matter.

Bats, whales, and dolphins, which hunt in darkness or murky water, find their way by using sound. This is called echolocation.

Water pipes in hilly areas often burst on a cold frosty night, because water in the pipes freezes and on freezing water expands in its volume, causing a significant amount of pressure build-up, so pipes break.

The spoon dropped by an astronaut in a satellite will continue to follow the motion of the satellite. The reason that an object (spoon) will maintain its orbit, regardless of its position in the orbit, is because the gravitational force from the larger object (earth) will constantly act upon the smaller object, thereby pulling the smaller object towards the larger object.

Guglielmo Marconi sent out the first wireless signals in 1897. Max Planck unveiled the Quantum Theory in 1900. Wright Brothers successfully flew an aircraft in 1903. Albert Einstein propounded the General Theory of Relativity in 1915.