Correct Answer : Mushroom
Correct Answer : oxygen and acetylene
The gases used in different types of welding would include: oxygen and hydrogen oxygen, hydrogen, acetylene and nitrogen oxygen, acetylene and argon oxygen and acetylene.
Correct Answer : Semiconductor laser
A semiconductor laser (LD) is a device that causes laser oscillation by flowing an electric current to semiconductor. It is used in Laser Printers.
Correct Answer : Barium
In fireworks, the green flame is produced because of barium.
Correct Answer : The center of the Earth
The weight of an object is minimum when it is placed at the center of the earth because when an object is in the center, it experiences gravitational pull from all directions.
Correct Answer : Enloroxylenol
The active ingredient in Dettol that confers its antiseptic property is chloroxylenol (C₈H³ClO), an aromatic chemical compound. Chloroxylenol comprises 4.8% of Dettol’s total mixture, with the rest composed of pine oil, isopropanol, castor oil soap, caramel and water.
Correct Answer : vision
Drowsiness is the state of feeling sleepyness and tired in the day time. It affects our senses especially the sense of vision
Correct Answer : Neon
Neon is the element that is used in bright flashing advertising signs as Neon particulary gives bright color.
Correct Answer : Fossils
Radiocarbon dating (usually referred to simply as carbon-14 dating) is a radiometric dating method. It uses the naturally occurring radioisotope carbon-14 (¹⁴C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years old.The accuracy of this proposal was proven by dating a piece of wood from an Ancient Egyptian barge, the age of which was already known. From that point on, scientists have used these techniques to examine fossils, rocks, and ocean currents; as well as to determine age and event timing. Throughout the years, measurement tools have become more technologically advanced, allowing researchers to be more precise. We now use what is known as the Cambridge half-life of 5730+/- 40 years for Carbon-14. Although it may be seen as outdated, many labs still use Libby's half-life in order to stay consistent in publications and calculations within the laboratory. From the discovery of Carbon-14 to radiocarbon dating of fossils, we can see what an essential role Carbon has played and continues to play in our lives today.
Correct Answer : Magnesium
In the US, 63% of magnesium production came from seawater. The Metal is extracted from seawater and brines by means of electrolysis, a process that requires the passing of a current through a molten salt. This extracts the metal from the salt, but requires a high temperature to melt the salt.
