Science & Mathematics Questions & Answers

Wireless electric power transfer is theoretically possible and it’s in the R&D phase of many leading research labs in the world. Nasa hopes to power its Mars Rover wirelessly in future missions. The basic technology is simple: rectify the received microwave signal using a microwave low-pass filter and a diode. This structure is called rectenna (rectifier + antenna). Many Radio …

Theoretically, no, as the plane of orbit of each planet is tilted slightly in relation to other planets. However, if we ignore the intra-orbital plane tilt, then the chance of all planets (eight now excluding Pluto) to be at the right ascension with respect to sun at same time would be once in 180 trillion years. For an exact alignment, …

How many times have you heard someone say, ‘I think I’ll go out for a breathe of fresh air’? Have you ever stopped to think what this means in our industrialized world? Of course, if you happen to be living high up among the mountains where there is little or no industry and few people, your chances of finding fresh …

In some respects cartilage perform much the same function as bone, that is, it supports parts of the body and enables muscles to work. But it is tough, elastic tissue. Boxes are not elastic.

There are stories of people being attacked by an octopus and frantically tying to detach the suckers of the encircling arms. This may happen very rarely and when it does the octopus is really investigating a new moving shape rather than attacking it. If the person could manage to keep perfectly still the octopus would soon let him go.

The softness of a metal is its ability to undergo permanent deformation under applied stress. All metals have specific crystalline structures. Each structure has its own densely packed crystalline planes. There exist line defects and plane defects in a crystal system. Such defects are more in densely packed crystal systems, i.e., metallic crystals with higher density, and result in a …

While krypton is generally an inert element, in extreme volatile conditions, it can form compounds in very small quantities. There are several ways that krypton can form its fluoride: by passing through an electrical arc, proton bombardment or photochemical process. All these processes require a very heavy amount of energy. Krypton has achieved a unique importance in science. In 1960, …

Plant cells have cell organelles known as plastids, which are colouring agents. There are three types of plastids – chloroplasts (contain green pigment chlorophyll), leucoplasts (white or colourless plastids) and chromoplasts (contain other pigments). All cells have varying proportions of these. Flowers have a majority of the third type and get their colours from these. From Wikipedia Chromoplasts are plastids …

Guerrillas is derived from the Spanish language which means “little war”, guerrillas are fighters who are not regular soldiers. Working in small groups, guerrillas make sudden raids on invading forces.

A man jumping on the surface of the moon would leap six times as high as he could on earth because the moos has only one-sixth the gravity of earth: therefore the man would jump a height of 30 feet.