A. Alcohol B. Kerosene oil C. Glycerine D. Fats The most basic kind of soap is made from caustic soda and animal fat. The two are heated together, and then cooled. The process is called “saponification”. In technical terms, saponification involves base (usually caustic soda NaOH) hydrolysis of triglycerides, which are esters of fatty acids, … Read more
A. Radium dating B. Uranium dating C. Carbon dating D. Deuterium dating Carbon dating is the name of that system, which uses radioactivity to decide the period of materials of-pre-historic period ?. The system that uses radioactivity to decide the period of materials of the pre-historic period is Carbon Dating.
A. Carbon dioxide B. Carbonates absorbed from soil C. Oxides of minerals D. Water
A. Uranium B. Deuterium C. Plutonium D. Radium
A. CAT scans B. X-ray photos C. Ultrasound scans D. Endoscopy Endoscopes use optical fibres to produce an image of inside the body. A doctor can insert a bundle of optical fibres into the body. Some carry light into the body, and some carry light reflected off internal body surfaces back out. This allows the … Read more
A. it becomes very hard B. it reflects most of the heat from the sun C. it has a low specific heat capacity D. it has a high latent heat of fusion At mountain, there is very large amount of snow i.e. m is very very high. And for melts of ice, latent heat of … Read more
A. Photoelectric emission B. Nuclear fission C. Nuclear fusion D. Thermionic emission
A. ease the process of cooking B. increase the taste C. produce small amount of hydrochloric acid required for digestion D. inclease solubility of food particles in water
A. Nitrates B. Fluorides C. Arsenic D. Mercury In China (Province of Taiwan) exposure to arsenic via drinking-water has been shown to cause a severe disease of the blood vessels, which leads to gangrene, known as ‘black foot disease’. This disease has not been observed in other parts of the world, and it is possible … Read more
A. 1s2 2s2 2p6 3s2 3p6 3d7 B. 1s2 2s2 2p6 3s2 3p6 4s2 4p5 C. 1s2 2s2 2p6 3s2 3p5 3d10 D. 1s2 2s2 2p6 3s2 3p6 4s23d5