Quartz crystals normally used in quartz clocks etc. is
chemically
1 Sodium silicate
2 Germanium oxide
3 Silicon dioxide
4 None of these
Why is ice wrapped in gunny sacks to prevent it from melting
WHATE COLOUR OF STAR;SIZE;
Gypsum is added to cement clinker to 1 Increase the tensile strength of cement 2 Bind the particles of calcium silicate 3 Decrease the rate of setting of cement 4 Facilitate the formation of colloidal gel
Of the following metals which, one pollutes the air of a big city? 1 Copper 2 Chromium 3 Lead 4 Cadmium
3 Answers HCL, High Court, SSC,
why nitrogen is about 70%(i.e.)highest percentage in environment
According to Dalton’s atomic theory, the smallest particle which can exist independently is 1 An atom 2 A molecule 3 A cation 4 An anion
Of the various forms of carbon, the one which is used for adsorption purpose, is 1 Diamond 2 Graphite 3 Coke 4 Wood charcoal
What are comets?
What is the cytology ?
In which year was the meteorology department founded?
In an atomic nucleus, neutrons and protons are held together by 1 Gravitational forces 2 Magnetic forces 3 Exchange force 4 Coulombic forces
How does common salt help in separating soap from the solution after saponification? 1 By decreasing solubility of soap 2 By increasing solubility of soap 3 By decreasing density of soap 4 None of these