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who discovered electromagnet

Posted by Aruna Chaumal (Jul 23, 2017 7:45 p.m.) (Question ID: 6879)

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  • <div class="text-subhead">

    In 1820 , Hans Christian Oersted discovered that a current-carrying wire set up a magnetic field.

    But Joseph Henry took the final step towards creating a electromagnet that we use today.

    </div>

     

     

    Answered by Just Henry (Jul 24, 2017 12:18 a.m.)
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  • In 1820 , Hans Christian Oersted discovered that a current-carrying wire set up a magnetic field.

    But Joseph Henry took the final step towards creating a electromagnet that we use today, in year 1832.

    Answered by Swami Jee (Jul 23, 2017 8:03 p.m.)
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  • In 1820 , Hans Christian Oersted discovered that a current-carrying wire set up a magnetic field.

    But Joseph Henry took the final step towards creating a electromagnet that we use today.

    Answered by Swami Jee (Jul 23, 2017 8:03 p.m.)
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How to prepare alum crystals? short and easy answer fast please?

Posted by Mritsha Bhattacharjee (Jul 23, 2017 12:07 p.m.) (Question ID: 6865)

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  • Add 4 oz. of alum powder to 2 cups of water over a medium flame. Stir until all alum is dissolved, and add another 4 oz. Continue adding and stirring until the powder no longer dissolves. The water is now saturated with alum.

    Remove the mixture from heat, and let it cool. Pour half of the mixture into the shallow dish and leave uncovered. Pour the other half into a glass jar and stir in an additional tablespoon of powder. Cover with a cloth and leave in a consistently warm location.

    Collect the crystals that form in the dish once the water has dissolved.

    Answered by Swami Jee (Jul 23, 2017 8:27 p.m.)
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 find the perimeter of the triangle whose sides are 2y + 3z , z - y and 4y - 2z

Posted by Ayhtas Sathya (Jul 21, 2017 5:23 p.m.) (Question ID: 6814)

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  • Perimetry of triangle = sum of all sides

    = 2y + 3z +z - y + 4y - 2z

    = 5y + 2z

    Answered by Sahdev Sharma (Jul 21, 2017 5:27 p.m.)
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GIVE REASON

POKAR BEAR  HAVE TWO THICK LAYER OF FUR

Posted by Akash Pradeepan (Jul 20, 2017 9:16 p.m.) (Question ID: 6799)

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  • To protect from extreme cold conditon.

    Answered by Rajendra Singh (Jul 22, 2017 5:37 p.m.)
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how plants take in carbon dioxide through stomata

 

Posted by Amitesh Jammula (Jul 19, 2017 8:27 p.m.) (Question ID: 6772)

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  • Plants get carbon dioxide from the air through their leaves. The carbon dioxide diffuses through small holes in the underside of the leaf called stomata. (One of these holes is called a stoma. The plural is stomata.)

    Answered by Ashutosh Kumar (Jul 20, 2017 10:13 a.m.)
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Hindi ka manak roop kya h

Posted by Shahista Anjum (Jul 14, 2017 9:31 p.m.) (Question ID: 6644)

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  • मानक हिन्दी हिन्दी का मानक स्वरूप है जिसका शिक्षा, कार्यालयीन कार्यों आदि में प्रयोग किया जाता है। भाषा का क्षेत्र देश, काल और पात्र की दृष्टि से व्यापक है। इसलिये सभी भाषाओं के विविध रूप मिलते हैं। इन विविध रूपों में एकता की कोशिश की जाती है और उसे मानक भाषा कहा जाता है।

    Answered by Sahdev Sharma (Jul 14, 2017 9:50 p.m.)
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Find the square root of 23 192/729

Posted by Shahista Anjum (Jul 14, 2017 6:45 p.m.) (Question ID: 6641)

  • Can you tell me the chapter name and class that i should help you easily.

    Posted by Hasan Raza (Jul 14, 2017 9:32 p.m.)
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  • ²√23 = 4.7958

    Answered by Hasan Raza (Jul 14, 2017 9:36 p.m.)
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1.Write any two points about the need of protective discrimination.

 

Posted by Upasana Ghosh (Jul 12, 2017 10:09 a.m.) (Question ID: 6589)

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    • Protective discrimination is the policy of granting special privileges to the downtrodden and the underprivileged sections of society, most commonly women.
    • These are affirmative action programs, most visible in both the United States and India, where there has been a history of racial and caste discrimination.
    • The practice is most prominent in India, where it has been enshrined in the constitution and institutionalised.
    Answered by Naveen Sharma (Jul 12, 2017 5:33 p.m.)
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1. Give a difference between plitical and non political executive.

Posted by Upasana Ghosh (Jul 12, 2017 10:08 a.m.) (Question ID: 6588)

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1.What do you mean by one man, one vote?

Posted by Upasana Ghosh (Jul 12, 2017 10:07 a.m.) (Question ID: 6587)

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  • In india,every citizens who are 18 years or above have right to vote and ecah vote will taken as vote.No vote is taken very specially that all vote seen as a equally.

    Answered by Archith Jayalal (Jul 12, 2017 6:33 p.m.)
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if area of square is 49sq.m then find its one side

Posted by Niraj Kumar (Jul 11, 2017 10:44 p.m.) (Question ID: 6582)

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  • Area of square = side×side

    49=side×side

    side=√49

    So, side= 7m

    Answered by Ashutosh Kumar (Jul 12, 2017 6:26 a.m.)
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what are ahoms

 

Posted by Lakshya Agarwal (Jul 11, 2017 3:35 p.m.) (Question ID: 6563)

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  • The Ahom are the descendants of the ethnic Tai people that accompanied the Tai prince into the Brahmaputra valley in 1228 and ruled the area for six centuries.

    Answered by Payal Singh (Jul 11, 2017 6:20 p.m.)
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which are the main glands in our body

Posted by Vivek R (Jul 10, 2017 7:07 p.m.) (Question ID: 6537)

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  • MAIN AND IMPORTANT GLANDS INOUR BODY WITH THEIR ENZYMES:

    1. SALIVARY GLAND: SALIVA
    2. LIVER: BILE JUICE
    3. PANCREAS: PANCREATIC JUICES
    4. GASTRIC GLANDS:GASTRIC JUICES
    Answered by Archith Jayalal (Jul 20, 2017 4:15 p.m.)
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what are acid

 

Posted by Vidhi Rana (Jul 10, 2017 5:46 p.m.) (Question ID: 6534)

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  • Acids are chemical substance that are sour in taste and turn blue litmus red.

    Answered by Rajendra Singh (Jul 22, 2017 5:38 p.m.)
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3x2+2(x+2)-3x(2x+1)

Posted by Navin Prakash (Jul 09, 2017 5:43 p.m.) (Question ID: 6513)

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  • {tex}3x^2+2(x+2)-3x(2x+1)= 0{/tex}

    => {tex}3x^2+2x+4-6x^2-3x= 0{/tex}

    {tex}=>3x^2+x-4=0{/tex}

    {tex}=>3x^2+4x-3x-4=0{/tex}

    {tex}=>x(3x+4)-1(3x+4)=0{/tex}

    {tex}=>(x-1)(3x+4)=0{/tex}

    {tex}=>x=1,-{4\over 3}{/tex}

    Answered by Sahdev Sharma (Jul 09, 2017 7:03 p.m.)
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How does rain gauge watch like

Posted by Padma Kumari Kewalramani (Jul 07, 2017 9:03 p.m.) (Question ID: 6460)

  • Syllabus for 12 cbse 2018..

     

    Posted by Attitudeboy Anand (Jul 07, 2017 9:34 p.m.)
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  • Rain  gause looks like cuboidal structure with more height.

    Answered by Rajendra Singh (Jul 22, 2017 5:40 p.m.)
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Can enyone tell me about the rain gauge and how does it works ( brief history )

Posted by Padma Kumari Kewalramani (Jul 07, 2017 5:03 p.m.) (Question ID: 6454)

  • Thankyou so much doc.

    Posted by Padma Kumari Kewalramani (Jul 07, 2017 8:55 p.m.)
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  • A rain gauge is an instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over a set period of time.The tipping bucket rain gauge consists of a funnel that collects and channels the precipitation into a small seesaw-like container. After a pre-set amount of precipitation falls, the lever tips, dumping the collected water and sending an electrical signal.

    Answered by Dr Pathikrt Banerjee (Jul 07, 2017 7:14 p.m.)
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The earth is made up of several concentric layers can you describe them with the help of a diagram. 

 

Posted by Padma Kumari Kewalramani (Jul 06, 2017 4:43 p.m.) (Question ID: 6425)

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  • Thankyou so much

    Answered by Padma Kumari Kewalramani (Jul 06, 2017 9:06 p.m.)
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  • The Earth consists of four concentric layers: inner core, outer core, mantleand crust. The crust is made up of tectonic plates, which are in constant motion. Earthquakes and volcanoes are most likely to occur at plate boundaries.

    <h1>The structure of the Earth</h1>

    The Earth is made up of four distinct layers:

    1. The inner core is in the centre and is the hottest part of the Earth. It is solid and made up of iron and nickel with temperatures of up to 5,500°C. With its immense heat energy, the inner core is like the engine room of the Earth.
    2. The outer core is the layer surrounding the inner core. It is a liquid layer, also made up of iron and nickel. It is still extremely hot, with temperatures similar to the inner core.
    3. The mantle is the widest section of the Earth. It has a thickness of approximately 2,900 km. The mantle is made up of semi-molten rock called magma. In the upper parts of the mantle the rock is hard, but lower down the rock is soft and beginning to melt.
    4. The crust is the outer layer of the earth. It is a thin layer between 0-60 km thick. The crust is the solid rock layer upon which we live.
    Answered by Aanvi Gupta (Jul 06, 2017 5:11 p.m.)
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what are minerals? can you list some of their uses.

Posted by Padma Kumari Kewalramani (Jul 06, 2017 4:42 p.m.) (Question ID: 6424)

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  • mineral is a naturally occurring chemical compound, usually of crystalline form and abiogenic in origin. A mineral has one specific chemical composition.

    Examples:

    Granite, cinnabar, quartz 

    Answered by Minakshi Kapoor (Jul 07, 2017 3:08 p.m.)
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  • Very big answer for me but thanks

     

    Answered by Padma Kumari Kewalramani (Jul 06, 2017 9:09 p.m.)
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  • Every segment of society uses minerals and mineral resources everyday. The roads we ride or drive on and the buildings we live learn and work in all contain minerals. Below is a selected list of commonly used metallic and nonmetallic minerals, ore minerals, mineral byproducts, aggregates, and rock types that are used to make products we use in our daily life.

    Aggregates
    Natural aggregates include sand, gravel, and crushed stone. Aggregates are composed of rock fragments that may be used in their natural state or after mechanical processing, such as crushing, washing, or sizing. Recycled aggregates consist mainly of crushed concrete and crushed asphalt pavement.
    Bauxite

    Aluminum
    Aluminum is the most abundant metallic element in the Earth's crust. Bauxite ore is the main source of aluminum. Aluminum is used in automobiles and airplanes (36%), bottling and canning industries (25%), building and electrical (14%) and in other applications (25%). 

    Antimony
    Antimony
    Antimony is a silvery-gray, brittle semi-metal. It rarely occurs in nature as a native element, but is found in a number of different minerals. Antimony is used principally for flame retardants as well as in ammunition and automotive batteries and as a decolorizing agent in glassmaking. 

    Asbestos
    Asbestos
    Asbestos is a class of minerals that can be readily separated into thin, strong fibers that are flexible, heat resistant, and chemically inert. Asbestos minerals are used in fireproof fabrics, yarn, cloth, and paper and paint filler. Asbestos is used to make friction products, asbestos cement pipes and sheets, coatings and compounds, packing and gaskets, roofing and flooring products, paints and caulking, and chemical filters. Fibers are dangerous when breathed, so users must protect against fibers becoming airborne. 

    Basalt
    Basalt
    Basalt is an extrusive igneous rock. Crushed basalt is used for railroad ballast, aggregate in highway construction, and is a major component of asphalt. 

    Barium
    Barium
    Barium is an element, derived primarily from the mineral barite, and used as a heavy additive in oil-well-drilling mud, paints, rubber, plastic and paper; production of barium chemicals; and glass manufacturing.
    Beryllium

    Beryllium
    Beryllium, an element commonly associated with igneous rocks, has industrial and nuclear defense applications and is used in light, very strong alloys for the aircraft industry. Beryllium salts are used in x-ray tubes and as a deoxidizer in bronze metallurgy. The gemstones of beryl, a beryllium mineral, are emerald and aquamarine.
    Bismuth

    Bismuth
    Bismuth is used in a number of very different applications. The majority is consumed in bismuth alloys, and in pharmaceuticals and chemicals. The remainder is used in ceramics, paints, catalysts, and a variety of minor applications. Bismuth metal is relatively inert and non-toxic. It has replaced toxic lead in many applications such as plumbing, bullets, birdshot, metal alloys, and soldering. Bismuth compounds are used in stomach-upset medicines (hence the trademarked name Pepto-Bismol), treatment of stomach ulcers, soothing creams, and cosmetics.
    Boron

    Boron
    Boron compounds are used for many different purposes in industry and the home. Boron is used to make glass, ceramics, enamels, fiberglass, make water softeners, soaps and detergents. Other uses are in agricultural chemicals, pest controls, fire retardants, fireworks, medicine, and various minor applications. Boron nitride is one of the hardest known substances and is used for abrasives and cutting tools.
    Bromine
    Bromine, recovered commercially through the treatment of seawater brines, is used in leaded gasoline, fire extinguishers and retardants, well-completion fluids, and sanitary preparations. Bromine is the only liquid nonmetallic element.
    Cadmium
    Cadmium is used in plating and alloying, pigments, plastics, and batteries. Cadmium is obtained from the ore minerals Sphalerite (Zn,Cd)S and Greenockite (CdS)
    Calcium

    Calcium
    The primary use of calcium is not in its silvery-white metal form, but as calcium carbonate. It used in adhesives and sealants, cosmetics, foods, paint, paper, pharmaceuticals, plastics, rubber, for the production of lime, and as crhused stone in construction. Immense quantities of calcium are found in sedimentary rock deposits of gypsum, limestone, and shale. Some common calcium-bearing minerals include apatite (calcium phosphate), calcite (calcium carbonate), dolomite (calcium magnesium carbonate), fluorite (calcium fluoride), and gypsum (calcium sulfate). Calcium metal is produced in Canada, China, France, Russia, and the United States. Total world output is thought to be less than 6,000 metric tons per year. United States consumption of calcium metal is small. On a worldwide basis, more than 100 million metric tons per year of apatite and gypsum are mined, and calcite and dolomite are produced in billions of metric tons per year.
    Cement
    Cement is used for building materials, stucco, and mortar. Cement is :a mixture of powdered lime, clay, and other minerals that crystallize to form a hard solid when water is added (hydraulic cement) or as a binding material in concrete" (Kesler, 1994). An excellent overview of cement, its chemistry, and properties can be found in MacLaren and White (2003).
    Chromium

    Chromium
    Chromium is used in the production of stainless and heat-resistant steel, full-alloy steel, super alloys and other alloys. Chromium is obtained from the ore mineral Chromite (Mg,Fe)(Cr,Al,Fe)2O4
    Clays
    There are many different clay minerals that are used for industrial applications. Clays are used in the manufacturing of paper, refractories, rubber, ball clay, dinnerware and pottery, floor and wall tile, sanitary wear, fire clay, firebricks, foundry sands, drilling mud, iron-ore pelletizing, absorbent and filtering materials, construction materials, and cosmetics.
    Cobalt

    Cobalt
    Half of the consumption of cobalt is used in corrosion- and abrasion-resistant alloys with steel, nickel, and other metals for the production of industrial engines. Other uses of cobalt metal include magnets and cutting tools. Cobalt salts are used to produce a blue color in paint pigments, porcelain, glass, and pottery. Cobalt is obtained from the ore minerals Linneaite (Co3S4), Cobaltite CoAsS, and (Fe,Ni,Co)1-xSx.
    Copper

    Copper
    Copper is used in electric cables and wires, switches, plumbing; heating, electrical, and roofing materials; electronic components; industrial machinery and equipment; transportation; consumer and general products; coins; and jewelry. 

    Diamond
    Diamond
    Industrial diamonds are those that can not be used as gems. Large diamonds are used in tools and drilling bits to cut rock and small stone. Small diamonds, also known as dust or grit, are used for cutting and polishing stone and ceramic products. 

    Diatomite
    Diatomite
    Diatomite is a rock composed of the skeletons of diatoms, single-celled organisms with skeletons made of silica, which are found in fresh and salt water. Diatomite is primarily used for filtration of drinks, such as juices and wines, but it is also being used as filler in paints and pharmaceuticals and environmental cleanup technologies.
    Dolomite

    Dolomite
    Dolomite is the near twin-sister rock to limestone. Like limestone, it typically forms in a marine environment but also as has a primary magnesium component. Dolomite is used in agriculture, chemical and industrial applications, cement construction, refractories, and environmental industries.
    Feldspar

    Feldspar
    Feldspar is a rock-forming mineral. It is used in glass and ceramic industries; pottery, porcelain and enamelware; soaps; bond for abrasive wheels; cement; glues; fertilizer; and tarred roofing materials and as a sizing, or filler, in textiles and paper applications. 

    Fluorite
    Fluorite
    Fluorite is used in production of hydrofluoric acid, which is used in the pottery, ceramics, optical, electroplating, and plastics industries. It is also used in the metallurgical treatment of bauxite, as a flux in open-hearth steel furnaces, and in metal smelting, as well as in carbon electrodes, emery wheels, electric arc welders, and toothpaste as a source of fluorine.
    Garnet

    Garnet
    Garnet is used in water filtration, electronic components, ceramics, glass, jewelry, and abrasives used in wood furniture and transport manufacturing. "Garnet is a common metamorphic mineral that becomes abundant enough to mine in a few rocks" (Kesler, 1994).
    Germanium
    "Most germanium is recovered as a byproduct of zinc smelting. It is also found in some copper ores" (Kesler, 1994). Applications include use in fiber-optic components, which are replacing copper in long-distance telecommunication lines, as well as in camera lenses and other glasses and infrared lenses.
    Gold

    Gold
    Gold is used in dentistry and medicine, jewelry and arts, medallions and coins, and in ingots. It is also used for scientific and electronic instruments, computer circuitry, as an electrolyte in the electroplating industry, and in many applications for the aerospace industry.
    Granite

    Granite
    Granite can be cut into large blocks and used as a building stone. When polished, it is used for monuments, headstones, countertops, statues, and facing on buildings. It is also suitable for railroad ballast and for road aggregate in highway construction.
    Graphite

    Graphite
    Graphite is the crystal form of carbon. Graphite is used as a dry lubricant and steel hardener and for brake linings and the production of "lead" in pencils. Most graphite production comes from Korea, India, and Mexico.
    Gypsum

    Gypsum
    Processed gypsum is used in industrial or building plaster, prefabricated wallboard, cement manufacture, and for agriculture. 

    Halite
    Halite
    Halite (salt) is used in the human and animal diet, primarily as food seasoning and as a food preservation. It is also used to prepare sodium hydroxide, soda ash, caustic soda, hydrochloric acid, chlorine, and metallic sodium, and it is used in ceramic glazes, metallurgy, curing of hides, mineral waters, soap manufacture, home water softeners, highway deicing, photography, and scientific equipment for optical parts.
    Iodine
    Iodine is used as an antibacterial agent in soaps and cleaning products in restrooms, in iodized salt to prevent goiter, and in first aid boxes as an antiseptic.
    Iron Ore

    Iron Ore
    Iron ore is used to manufacture steels of various types and other metallurgical products, such as magnets, auto parts, and catalysts. Most U.S. production is from Minnesota and Michigan. The Earth's crust contains about 5% iron, the fourth most abundant element in the crust. 

    Lead
    Lead
    Lead is used in batteries, construction, ammunition, television tubes, nuclear shielding, ceramics, weights, and tubes or containers. The United States is largest producer (mainly from Missouri), consumer, and recycler of lead metal.
    Limestone

    Limestone
    "A sedimentary rock consisting largely of the minerals calcite and aragonite, which have the same composition CaCO3". Limestone, along with dolomite, is one of the basic building blocks of the construction industry. Limestone is used as aggregate, building stone, cement, and lime and in fluxes, glass, refractories, fillers, abrasives, soil conditioners, and a host of chemical processes.
    Lithium

    Lithium
    Batteries made from lithium metal or lithium carbonate are used in smoke alarms, pacemakers, defibrillator machines, many other types of portable medical equipment, and in emergency communications equipment, including computers and cell phones.
    Magnesium

    Magnesium
    Magnesium (see dolomite) is used in cement, rubber, paper, insulation, chemicals and fertilizers, animal feed, and pharmaceuticals. Magnesium is obtained from the ore minerals Olivine (Fe,Mg)2SiO4, Magnesite MgCO3, and Dolomite CaMg(CO3)2.
    Manganese

    Manganese
    Manganese is essential to iron and steel production. Manganese is obtained from the ore minerals Braunite (Mn,Si)2O3, Pyrolusite MnO2, and Psilomelane BaMn9O18*2H2O. 

    Mercury
    Mercury
    Mercury is extracted from the mineral cinnabar and is used in electrical products, electrolytic production of chlorine and caustic soda, paint, and industrial and control instruments (thermometers and thermostats).
    Mica

    Mica
    Mica minerals commonly occur as flakes, scales, or shreds. Sheet muscovite (white) mica is used in electronic insulators, paints, as joint cement, as a dusting agent, in welldrilling mud and lubricants, and in plastics, roofing, rubber, and welding rods.
    Molybdenum

    Molybdenum
    Molybdenum is used in stainless steels (21%), tool steels (9%), cast irons (7%), and chemical lubricants (8%), and in other applications (55%). It is commonly used to make automotive parts, construction equipment, gas transmission pipes, and as a pure metal molybdenum is used as filament supports in light bulbs, metalworking dies, and furnace parts because of its high melting temperature (2,623°C).
    Nickel

    Nickel
    Nickel is vital as an alloy to stainless steel, and it plays a key roll in the chemical and aerospace industries. Leading producers are Canada, Norway, and Russia. 

    Phosphate rock
    Phosphate rock
    Primarily a sedimentary rock used to produce phosphoric acid and ammoniated phosphate fertilizers, feed additives for livestock, elemental phosphorus, and a variety of phosphate chemicals for industrial and home consumers. The majority of U.S. production comes from Florida, North Carolina, Idaho, and Utah.
    Platinum

    Platinum Group Metals (PGMs)
    PGM's include platinum, palladium, rhodium, iridium, osmium, and ruthenium. These elements commonly occur together in nature and are among the scarcest of the metallic elements. Platinum is used principally in catalytic converters for the control of automobile and industrial plant emissions; in jewelry; in catalysts to produce acids, organic chemicals, and pharmaceuticals; and in dental alloys used for making crowns and bridges.
    Potash

    Potash
    Potash is an industry term that refers to a group of water-soluble salts containing the element potassium, as well as to ores containing these salts (Kesler, 1994). Potash is used in fertilizer, medicine, the chemical industry, and to produce decorative color effects on brass, bronze, and nickel.
    Pyrite

    Pyrite
    Pyrite (fools gold) is used in the manufacture of sulfur, sulfuric acid, and sulfur dioxide; pellets of pressed pyrite dust are used to recover iron, gold, copper, cobalt, and nickel. 

    Quartz
    Quartz
    Quartz crystals are popular as a semiprecious gemstone; crystalline varieties include amethyst, citrine, rose quartz, and smoky quartz. Because of its piezoelectric properties (the ability to generate electricity under mechanical stress), quartz is used for pressure gauges, oscillators, resonators, and wave stabilizers. Quartz is also used in the manufacture of glass, paints, abrasives, refractories, and precision instruments.
    Sandstone

    Sandstone
    Sandstone is used as a building stone, road bases and coverings, construction fill, concrete, railroad ballast, and snow and ice control. 

    Silica
    Silica / Silicon
    Silica is used in the manufacture of computer chips, glass and refractory materials, ceramics, abrasives, and water filtration; and is a component of hydraulic cements, a filler in cosmetics, pharmaceuticals, paper, and insecticides; as an anti-caking agent in foods; a flatting agent in paint, and as a thermal insulator.
    Silver

    Silver
    Silver is used in photography, chemistry, electrical and electronic products (because of its very high conductivity), fine silverware, electroplated wire, jewelry, coins, and brazing alloys and solders.
    Strontium

    Strontium
    Photoluminescent exit signs use a class of newly developed phosphorescent pigments that are based on strontium oxide aluminate chemistry. 

    Sulfur
    Sulfur
    Sulfur is of importance to every sector of the world's manufacturing processes, drugs, and fertilizer complexes. Sulfur is used as an industrial raw material through its major derivative, sulfuric acid. Sulfuric acid production is the major end use for sulfur. Most sulfur goes into fertilizer; oil refining is another major use as well as a source of sulfur. 

    Talc
    Talc
    The primary use for talc is in the production of paper. Ground talc is used as filler in ceramics, paint, paper, roofing, plastics, cosmetics, and in agriculture. Talc is found in many common household products, such as baby (talcum) powder, deodorant, and makeup. Very pure talc is used in fine arts and is called soapstone. It is often used to carve figurines.
    Tin

    Tin
    Tin is used in the manufacture of cans and containers, electrical equipment, and chemicals. 

    Titanium
    Titanium
    Titanium is a metal used mostly in jet engines, airframes, and space and missile applications. In powdered form, titanium is used as a white pigment for paints, paper, plastics, rubber, and other materials.
    Trona
    Trona is used in glass container manufacture, fiberglass, specialty glass, flat glass, liquid detergents, medicine, food additives, photography, cleaning and boiler compounds, and control of water pH. Trona is mined mainly in Wyoming.
    Tungsten

    Tungsten
    Tungsten is used in steel production, metalworking, cutting applications, construction electrical machinery and equipment, transportation equipment, light bulbs, carbide drilling equipment, heat and radiation shielding, textile dyes, enamels, paints, and for coloring glass.
    Uranium

    Uranium
    Uranium is a radioactive material used in nuclear defense systems and for nuclear generation of electricity. It also used in nuclear-medicine x-ray machines, atomic dating, and electronic instruments.
    Zeolites

    Zeolites
    Some of the uses of zeolite minerals include aquaculture (for removing ammonia from the water in fish hatcheries), water softener, catalysts, cat litter, odor control, and removing radioactive ions from nuclear-plant effluent.
    Zinc

    Zinc
    Zinc is used as protective coating on steel, as die casting, as an alloying metal with copper to make brass, and as chemical compounds in rubber and paint. Additional uses include galvanizing iron, electroplating, metal spraying, automotive parts, electrical fuses, anodes, dry-cell batteries, nutrition, chemicals, roof gutters, cable wrapping, and pennies. Zinc oxide is used in medicine, paints, vulcanizing rubber, and sun-block lotions.
    Zirconium

    Zirconium
    Zirconium is a metal recovered from zircon. "Zircon is used in mineral form in refractory products, where it is valued for its high melting temperature of 2,550°C. Some zircon is processed by chemical leaching to yield elemental zirconium. The best known use for zirconium metal is in nuclear reactors, where zirconium contains the fuel" (Kesler, 1994).

    Answered by Babu Babubais2004 (Jul 06, 2017 7:44 p.m.)
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Find two rational number between -1/2and -3/4

Posted by Shahista Anjum (Jul 02, 2017 8:45 p.m.) (Question ID: 6329)

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  • First rational number = {tex}{1 \over 2}\left( {{{ - 1} \over 2} + {{ - 3} \over 4}} \right) = {1 \over 2}\left( {{{ - 2 - 3} \over 4}} \right) = {1 \over 2}\left( {{{ - 5} \over 4}} \right) = {{ - 5} \over 8}{/tex}

    Second rational number = {tex}{1 \over 2}\left( {{{ - 1} \over 2} + {{ - 5} \over 8}} \right) = {1 \over 2}\left( {{{ - 4 - 5} \over 8}} \right) = {1 \over 2}\left( {{{ - 9} \over 8}} \right) = {{ - 9} \over {16}}{/tex}

    Answered by Rashmi Bajpayee (Jul 03, 2017 9:47 a.m.)
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Simran devotes  7hours to her studies everyday she devotes 2 4/5hours in mathematics, 1 1/4hours to English and the remaining time to study other subjects how much time does the spend on other subjects 

Posted by Shahista Anjum (Jul 02, 2017 8:42 p.m.) (Question ID: 6328)

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  • Total hours devoted for study = 7 hours

    Hours devoted to study math = {tex}2{4\over 5}= {14\over 5}hours{/tex}

    Hours devoted to study  English= {tex}1{1\over 4}= {5\over 4}hours{/tex}

    Hours devoted to study math and english = {tex}{14\over 5} +{5\over 4}={ 56+25\over 20}={81\over 20}{/tex}

    hours devoted to study other subjects= total hours - hours devoted to study math and english = {tex}7-{81\over 20}= {59\over 20}=2{19\over 20} hours{/tex}

    Answered by Sahdev Sharma (Jul 02, 2017 10:50 p.m.)
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  • Total hours devoted = 7 hours

    Hours devoted for math = {tex}2{4\over 5}= {14\over 5}hours{/tex}

    Hours devoted for English= {tex}1{1\over 4}= {5\over 4}hour{/tex}

    Hours devoted for both English and math = {tex}{14\over 5} +{5\over 4}={ 56+25\over 20}={81\over 20}{/tex}

    hours devoted to other subjects = remaining hours = {tex}7-{81\over 20}= {59\over 20}=2{19\over 20} hours{/tex}

    Answered by Payal Singh (Jul 02, 2017 10:48 p.m.)
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On a TV channel a popular film lasted for 3 3/4 out of this time commercial advertisement were for 1 1/4what was the actual duration of the film. 

Posted by Shahista Anjum (Jul 02, 2017 8:36 p.m.) (Question ID: 6327)

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  • Total Duration for which film lasted  = {tex}3{3\over 4} = {15\over 4}hours{/tex}

    Time to show commercial advertisement = {tex}1{1\over 4}={5\over 4}hours{/tex}

    Duration of film only = {tex}{15\over 4}-{5\over4}= {15-5\over 4}={10\over 4}={5\over 2}{/tex}

    {tex}2{1\over 2}hours{/tex}

    Answered by Payal Singh (Jul 02, 2017 10:57 p.m.)
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  • Total Duration  = {tex}3{3\over 4} = {15\over 4}hours{/tex}

    Commercial advertisement = {tex}1{1\over 4}={5\over 4}hours{/tex}

    Duration of film = {tex}{15\over 4}-{5\over4}= {15-5\over 4}={10\over 4}={5\over 2}{/tex}

    {tex}2{1\over 2}hours{/tex}

    Answered by Sahdev Sharma (Jul 02, 2017 10:54 p.m.)
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Suit covered 7 5/12km in 2 hours on bicycle and 4 3/8 in another 1 hours on foot find the total distance covered by sumit in 3 hours

Posted by Shahista Anjum (Jul 02, 2017 8:34 p.m.) (Question ID: 6326)

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  • Distance covered by Sumit on bicycle in 2 hours = {tex}7{5\over 12} ={ 89\over 12}{/tex}km

    Distance covered by Sumit on foot in 1 hour = {tex}4{3\over 8}= {35\over 8}km{/tex}

    Total distance covered in 3 hour = {tex}{89\over 12}+{35\over 8} = {178+105\over 24}={283\over 24}{/tex}

    {tex}11{19\over 24}km{/tex}

    Answered by Payal Singh (Jul 02, 2017 10:41 p.m.)
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  • Distance covered by Sumit on bicycle = {tex}7{5\over 12} ={ 89\over 12}{/tex}km

    Distance covered by Sumit on foot = {tex}4{3\over 8}= {35\over 8}km{/tex}

    Total distance = sum of both distance = {tex}{89\over 12}+{35\over 8} = {178+105\over 24}={283\over 24}{/tex}

    {tex}11{19\over 24}km{/tex}

    Answered by Sahdev Sharma (Jul 02, 2017 10:39 p.m.)
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In a series of five one day matches Akhil scored 60runs in first match 35runs in second match 75 runs in third match and 24 runs in fourth match if the number of runs scored in fifth match were two times that in second match how many runs did akhil score in all

Posted by Shahista Anjum (Jul 02, 2017 8:29 p.m.) (Question ID: 6325)

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  • runs scored in first match by akhil = 60R
    runs scored in 2nd match by akhil  = 35
    runs scored in 3rdmatch by akhil = 75
    Runs scored in 4th match by akhil = 24
    Runs scored in 5th match by akhil = 2*runs scored in 2nd match = {tex}2\times 35 = 70{/tex}

    runs scored in series by akhil = 60+35+75+24+70 = 264

    Answered by Payal Singh (Jul 02, 2017 11:18 p.m.)
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  • Runs scored in first match = 60

    Runs scored in second match = 35

    Runs scored in third match = 75

    Runs scored in fourth match = 24

    Runs scored in fifth match = {tex}2\times 35 = 70{/tex}

    Runs scored in all matches = 60+35+75+24+70 = 264

    Answered by Sahdev Sharma (Jul 02, 2017 11:13 p.m.)
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Normal temperature of shimla during a month was 21°C on a particular day the change in temperature as compared with the normal temperature were as, 5am: -5°C; 10am:+5°C.;12noon:+7°C;and3pm:+2°C find the actual tempreture at 5am, 10am, 12noon, and 3pm

Posted by Shahista Anjum (Jul 02, 2017 8:24 p.m.) (Question ID: 6324)

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An airport X is due north of another airport Y an aeroplane leaving X flies due south for 380km and airport Y is now 50km away how far is xfrom Y

Posted by Shahista Anjum (Jul 02, 2017 8:17 p.m.) (Question ID: 6323)

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3/10-14/8 divided by 56/9

Posted by Rajesh Jambhale (Jul 02, 2017 1:04 p.m.) (Question ID: 6312)

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  •  3/10 - 14/ 8 = 3/10 -7/4= 6-35/20 = - 29/ 20 ( since 14/8= 7/4 &  Lcm (10,4 )= 20 )

    ( -29 / 20 divided by 56/ 9)

    => -29/20 ÷ 56/9  

    => -29/20 × 9/ 56 (since , a/b ÷ c/ d = a/b × d/ c = ad/ bc )

    => -29/20 × 1/ 6 = -29/ 120

    Answered by Estherrani Ponthurai (Jul 02, 2017 1:52 p.m.)
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2-3/5

Posted by Rohith Suresh (Jun 29, 2017 7:13 p.m.) (Question ID: 6256)

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  • {tex}2-{3\over 5}{/tex}

    {tex}= {2\over 1}-{3\over 5}{/tex}

    {tex}= {10-3\over 5}{/tex}

    {tex}= {7\over 5}{/tex}

    Answered by Payal Singh (Jun 30, 2017 12:52 a.m.)
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A report on environment day

Posted by Vandana Malhotra (Jun 28, 2017 9:46 a.m.) (Question ID: 6226)

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  • Is celebrated every year on 5th June. It is United Nation's principal vehicle for encouraging worldwide awareness and action for the protection of our environment. First held in 1973, it has been a flagship campaign for raising awareness on emerging environmental issues from marine pollution, human overpopulation, and global warming, to sustainable consumption and wildlife crime. WED has grown to become a global platform for public outreach, with participation from over 143 countries annually. Each year, WED has a new theme that major corporations, NGOs, communities, governments and celebrities worldwide adopt to advocate environmental causes.

    Answered by Dr Pathikrt Banerjee (Jun 28, 2017 11:15 a.m.)
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the molecules of ---------- are highly complex

Posted by Vishu Yadav (Jun 25, 2017 11:48 a.m.) (Question ID: 6171)

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  • Solid

    Answered by Renu Gandhi (Jun 27, 2017 7:27 p.m.)
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