UKPCS Science Chemistry: DETERGENTS:# 21

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science Chemistry (paper 6). 

DETERGENTS:

Surfactants are compounds that lower the surface tension (or interfacial tension) between two liquids or between a liquid and a solid. Surfactants may act as detergents, wetting agents, emulsifiers, foaming agents, and dispersants.

A detergent is an effective cleaning product because it contains one or more surfactants. Because of their chemical makeup, the surfactants used in detergents can be engineered to perform well under a variety of conditions. Such surfactants are less sensitive than soap to the hardness minerals in water and most will not form a film. Continue reading “UKPCS Science Chemistry: DETERGENTS:# 21”

UPPCS Mains- 2018 answer writing practice || UPPCS मुख्य परीक्षा – 2018 उत्तर लेखन अभ्यास #1

Friends,

Today we at Oracle IAS, are restarting our answer writing initiative for UPPCS Mains 2018. We shall provide questions in the morning/noon and answers for the same would be updated on the page itself in the evening.

मित्रो,

आज से हम UPPCS मुख्य परीक्षा – 2018 के लिए उत्तर लेखन अभ्यास शुरू करने जा रहे हैं|रोज सुबह/दोपहर को प्रश्न दिए जायेंगे और उनके उत्तर शाम को पेज पर अपडेट कर दिए जायेंगे|

Today’s questions/आज के प्रश्न:-

Ques1 : What steps did India take in early 1990s to liberalise the economy?(125 words) Continue reading “UPPCS Mains- 2018 answer writing practice || UPPCS मुख्य परीक्षा – 2018 उत्तर लेखन अभ्यास #1”

UKPCS Science Chemistry: DYE# 21

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science Chemistry (paper 6). 

DYE

A dye is a colored substance that has an affinity to the substrate to which it is being applied. The dye is generally applied in an aqueous solution, and may require a mordant to improve the fastness of the dye on the fiber.

Both dyes and pigments are colored because they absorb some wavelengths of light more than others. In contrast to dyes, pigments are insoluble and have no affinity for the substrate. Continue reading “UKPCS Science Chemistry: DYE# 21”

UKPCS Science Chemistry: STEEL # 20

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science Chemistry (paper 6). 

STEEL

Steel is an alloy of iron and other elements, primarily carbon that is widely used in construction and other applications because of its high tensile strength and low cost. Steel’s base metal is iron. The carbon content of steel is between 0.002% and 2.1% by weight for plain iron–carbon alloys. These values vary depending on alloying elements such as manganese, chromium, nickel, iron, tungsten, carbon and so on. Today, steel is one of the most common materials in the world, with more than 1.3 billion tons produced annually. It is a major component in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons. Continue reading “UKPCS Science Chemistry: STEEL # 20”

UKPCS Science Chemistry: Aluminium #19

Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science Chemistry (paper 6). 

ALMUNIUM 

Aluminium is a chemical element in the boron group with symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, ductile metal. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below.

Aluminium is remarkable for the metal’s low density and its ability to resist corrosion. Aluminium and its alloys are vital to the aerospace industry and important in transportation and structures, such as building facades and window frames.

PRODUCTION: Continue reading “UKPCS Science Chemistry: Aluminium #19”