Physics Quiz 2

When atmospheric pressure drops suddenly, this usually indicates that a storm is on its way. At the onset of a storm, low pressure occurs, which in turn would lead to rapid or violent movement of air from the high-pressure areas.

Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn. Water is heavier than petrol, petrol will come above the water and continue the contact with the atmosphere (oxygen).

Adiabatic demagnetization is a process by which the removal of a magnetic field from certain materials serves to lower their temperature. It comes under magnetic cooling, exploiting paramagnetic properties to cool some materials down.

Herman Hollerith (1860-1929) was a German-American statistician, inventor, and businessman. He was the inventor of the punched card tabulating machine—the precursor of the modern computer—and one of the founders of modern information processing. His machine was used to gather information for the 1890 census more efficiently.

Rocket engines and boosters carry both fuel and an oxidizer. For solid fuel, the components are aluminium and ammonium perchlorate. For liquid fuel, the components are liquid hydrogen and liquid oxygen. When combined, the fuels release water, which allows the rocket to leave the ground.

The instrument used to see the distant objects on the Earth is a terrestrial telescope. Astronomical telescopes are used for viewing distant stars and planets whereas terrestrial telescopes are used for viewing distant objects on earth.

Woollen clothes keep the body warm because wool is a bad conductor of heat. Woollen clothes are thick and trap air inside forming a layer around the body and so it does not let our body temperature decrease through conduction.

In economics, economic equilibrium is a situation in which economic forces such as supply and demand (internal factors) are balanced and in the absence of external influences, the values of economic variables will not change.

Longitudinal waves such as sound cannot travel through the vacuum as they need a medium to travel. Light and other types of electromagnetic waves are considered transverse waves. These waves travel through a vacuum as they do not need a medium for their propagation.

The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.