Thermometer
Hydrometer
Barometer
PH meter
The hydrophilic nature of DNA is due to the presence of
The image made by a plane mirror is always -
The image of a distant object as seen through an astronomical telescope is
The important metal used with iron to produce stainless steel is
The important ore of aluminium is
The inert gas abundantly found in atmosphere is
The influx of domestic sewage containing detergents cause nutrient enrichment in water bodies due to the presence of
The instrument used to measure pressure-
The invention of the transistor, or semiconductor, was one of the most important developments leading to the personal computer revolution. What company invented the transistor in 1947?
The iron ore which contains 72% of iron is:
