QUES: Many applications of silicate glasses derive from their optical transparency, which gives rise to one of silicate glasses' primary uses as window panes. Glass will transmit, reflect and refract light; these qualities can be enhanced by cutting and polishing to make optical lenses, prisms, fine glassware, and optical fibers for high speed data transmission by light. Glass can be colored by adding metallic salts, and can also be painted and printed with vitreous enamels. These qualities have led to the extensive use of glass in the manufacture of art objects and in particular, stained glass windows. Although brittle, silicate glass is extremely durable, and many examples of glass fragments exist from early glass-making cultures. Because glass can be formed or molded into any shape, and also because it is a sterile product, it has been traditionally used for vessels: bowls, vases, bottles, jars and drinking glasses. In its most solid forms it has also been used for paperweights, marbles, and beads. When extruded as glass fiber and matted as glass wool in a way to trap air, it becomes a thermal insulating material, and when these glass fibers are embedded into an organic polymer plastic, they are a key structural reinforcement part of the composite material fiberglass. Some objects historically were so commonly made of silicate glass that they are simply called by the name of the material, such as drinking glasses and reading glasses.
What ingredient makes glass colorful?

ANS: metallic salts

QUES: In 1872, Russian Alexander Lodygin invented an incandescent light bulb and obtained a Russian patent in 1874. He used as a burner two carbon rods of diminished section in a glass receiver, hermetically sealed, and filled with nitrogen, electrically arranged so that the current could be passed to the second carbon when the first had been consumed. Later he lived in the USA, changed his name to Alexander de Lodyguine and applied and obtained patents for incandescent lamps having chromium, iridium, rhodium, ruthenium, osmium, molybdenum and tungsten filaments, and a bulb using a molybdenum filament was demonstrated at the world fair of 1900 in Paris.
When did Lodygin invent his first lamp?

ANS: 1872

QUES: On 7 August 1998, al-Qaeda struck the U.S. embassies in Kenya and Tanzania, killing 224 people, including 12 Americans. In retaliation, U.S. President Bill Clinton launched Operation Infinite Reach, a bombing campaign in Sudan and Afghanistan against targets the U.S. asserted were associated with WIFJAJC, although others have questioned whether a pharmaceutical plant in Sudan was used as a chemical warfare plant. The plant produced much of the region's antimalarial drugs and around 50% of Sudan's pharmaceutical needs. The strikes failed to kill any leaders of WIFJAJC or the Taliban.
Who launched Operation Reach Infinite?

ANS: unanswerable

QUES: Krispy Kreme, an international chain of doughnut stores, was started in North Carolina; the company's headquarters are in Winston-Salem. Pepsi-Cola was first produced in 1898 in New Bern. A regional soft drink, Cheerwine, was created and is still based in the city of Salisbury. Despite its name, the hot sauce Texas Pete was created in North Carolina; its headquarters are also in Winston-Salem. The Hardee's fast-food chain was started in Rocky Mount. Another fast-food chain, Bojangles', was started in Charlotte, and has its corporate headquarters there. A popular North Carolina restaurant chain is Golden Corral. Started in 1973, the chain was founded in Fayetteville, with headquarters located in Raleigh. Popular pickle brand Mount Olive Pickle Company was founded in Mount Olive in 1926. Fast casual burger chain Hwy 55 Burgers, Shakes & Fries also makes its home in Mount Olive. Cook Out, a popular fast-food chain featuring burgers, hot dogs, and milkshakes in a wide variety of flavors, was founded in Greensboro in 1989 and has begun expanding outside of North Carolina. In 2013, Southern Living named Durham - Chapel Hill the South's "Tastiest City."
Where was pepsi first produced?

ANS:
New Bern