WHICH CHEMICAL SUBSTANCE IS KNOWN AS ' PHILOSOPHER'S WOOL ' ?->(Show Answer!)

1. WHICH CHEMICAL SUBSTANCE IS KNOWN AS ' PHILOSOPHER'S WOOL '

Answer: ZINC OXIDE

Reply

Comments

Tags

Show Similar Question And Answers

QA->WHICH CHEMICAL SUBSTANCE IS KNOWN AS ' PHILOSOPHER'S WOOL '....

QA->WHICH CHEMICAL SUBSTANCE IS KNOWN AS " PHILOSOPHER"S WOOL "....

QA->Which is called philosopher’s wool?....

QA->Which chemical is popularly known as the philosophers Wool?....

QA->WHICH CHEMICAL SUBSTANCE IS KNOWN AS BLUE VITRIOL....

MCQ->A firm manufactures 3 types of clothes namely A, B, and C Red, Green and Blue colour wool are required for it. For one unit length of type A cloth required 2 m red wool, 3 m blue wool. Type B cloth need 3 m red, 2 m green and 4 m blue. Type C clothes need 5 m green and 4 m blue. The firm has stock of 8 m of red wool, 10 m of green wool and 15 m blue wool. If the income from one unit length of type A is Rs. 3, R is Rs. 5 and C is Rs. 4t which formulation is not correct?...

MCQ->Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is...

MCQ->In this question, a passage is given followed by a statement. Read the passage carefully and judge the statement based on the given passage.The strong olfactory sense elephants ar e known for has come as a blessing in disguise for the police in curbing illicit liquor trade in Uttarakhand’s Udham SinghNagar district. The animals find lahan, the substance used for brewing liquor, hidden in forests of Khatima in the district, and destroy them. Manufacturers brew it near nullahsdeep inside the forests or near the villages to avoid police raids as flowing water is required for fermentation.Lahan is sealed in barrels or polythene bags and buried for four to five days for fermentation. Elephants reach the spot by smelling the substance and destroy the barrels to consume the liquor, said Yogesh Upadhaya, inspector, Khatima police station. He said some traders keep the barrels on scaffoldings on trees but they are easily spotted by the police. “We have destroyed thousand litres of lahan in the past 23 months. They were stored in barrels on scaffoldings,” said Yogesh Upadhyay, inspector. “Miscreants place barrels of lahan on trees to keep them away from elephants. Elephants find them and destroy the barrels to consume the substance, causing heavy loss to the manufacturers,” he added. A villager, said: “The liquor is sold for Rs 80 to 100 per litre in villages. Since it is cheaper than liquor available in the market, people buy it even after knowing its impact on health. Elephants are playing vital role in curbing the trade.” Statement: Lahan is one of the costliest liquor that is available.Choose the appropriate one from the following options A The statement is definitely true. B The statement is probably true. C The statement cannot be determ ined. D The statement is definitely false....

MCQ->In this question, a passage is given followed by a statement. Read the passage carefully and judge the statement based on the given passage. The strong olfactory sense elephants ar e known for has come as a blessing in disguise for the police in curbing illicit liquor trade in Uttarakhand’s Udham SinghNagar district. The animals find lahan, the substance used for brewing liquor, hidden in forests of Khatima in the district, and destroy them. Manufacturers brew it near nullahsdeep inside the forests or near the villages to avoid police raids as flowing water is required for fermentation. Lahan is sealed in barrels or polythene bags and buried for four to five days for fermentation. Elephants reach the spot by smelling the substance and destroy the barrels to consume the liquor, said Yogesh Upadhaya, inspector, Khatima police station. He said some traders keep the barrels on scaffoldings on trees but they are easily spotted by the police. “We have destroyed thousand litres of lahan in the past 23 months. They were stored in barrels on scaffoldings,” said Yogesh Upadhyay, inspector. “Miscreants place barrels of lahan on trees to keep them away from elephants. Elephants find them and destroy the barrels to consume the substance, causing heavy loss to the manufacturers,” he added. A villager, said: “The liquor is sold for Rs 80 to 100 per litre in villages. Since it is cheaper than liquor available in the market, people buy it even after knowing its impact on health. Elephants are playing vital role in curbing the trade.” Statement: Police officially use elephants to stop illicit liquor trade.Choose the appropriate one from the following options A The statement is definitely true. B The statement is probably true. C The statement cannot be determ ined. D The statement is definitely false....

MCQ-> Cells are the ultimate multi-taskers: they can switch on genes and carry out their orders, talk to each other, divide in two, and much more, all at the same time. But they couldn’t do any of these tricks without a power source to generate movement. The inside of a cell bustles with more traffic than Delhi roads, and, like all vehicles, the cell’s moving parts need engines. Physicists and biologists have looked ‘under the hood’ of the cell and laid out the nuts and bolts of molecular engines.The ability of such engines to convert chemical energy into motion is the envy nanotechnology researchers looking for ways to power molecule-sized devices. Medical researchers also want to understand how these engines work. Because these molecules are essential for cell division, scientists hope to shut down the rampant growth of cancer cells by deactivating certain motors. Improving motor-driven transport in nerve cells may also be helpful for treating diseases such as Alzheimer’s, Parkinson’s or ALS, also known as Lou Gehrig’s disease.We wouldn’t make it far in life without motor proteins. Our muscles wouldn’t contract. We couldn’t grow, because the growth process requires cells to duplicate their machinery and pull the copies apart. And our genes would be silent without the services of messenger RNA, which carries genetic instructions over to the cell’s protein-making factories. The movements that make these cellular activities possible occur along a complex network of threadlike fibers, or polymers, along which bundles of molecules travel like trams. The engines that power the cell’s freight are three families of proteins, called myosin, kinesin and dynein. For fuel, these proteins burn molecules of ATP, which cells make when they break down the carbohydrates and fats from the foods we eat. The energy from burning ATP causes changes in the proteins’ shape that allow them to heave themselves along the polymer track. The results are impressive: In one second, these molecules can travel between 50 and 100 times their own diameter. If a car with a five-foot-wide engine were as efficient, it would travel 170 to 340 kilometres per hour.Ronald Vale, a researcher at the Howard Hughes Medical Institute and the University of California at San Francisco, and Ronald Milligan of the Scripps Research Institute have realized a long-awaited goal by reconstructing the process by which myosin and kinesin move, almost down to the atom. The dynein motor, on the other hand, is still poorly understood. Myosin molecules, best known for their role in muscle contraction, form chains that lie between filaments of another protein called actin. Each myosin molecule has a tiny head that pokes out from the chain like oars from a canoe. Just as rowers propel their boat by stroking their oars through the water, the myosin molecules stick their heads into the actin and hoist themselves forward along the filament. While myosin moves along in short strokes, its cousin kinesin walks steadily along a different type of filament called a microtubule. Instead of using a projecting head as a lever, kinesin walks on two ‘legs’. Based on these differences, researchers used to think that myosin and kinesin were virtually unrelated. But newly discovered similarities in the motors’ ATP-processing machinery now suggest that they share a common ancestor — molecule. At this point, scientists can only speculate as to what type of primitive cell-like structure this ancestor occupied as it learned to burn ATP and use the energy to change shape. “We’ll never really know, because we can’t dig up the remains of ancient proteins, but that was probably a big evolutionary leap,” says Vale.On a slightly larger scale, loner cells like sperm or infectious bacteria are prime movers that resolutely push their way through to other cells. As L. Mahadevan and Paul Matsudaira of the Massachusetts Institute of Technology explain, the engines in this case are springs or ratchets that are clusters of molecules, rather than single proteins like myosin and kinesin. Researchers don’t yet fully understand these engines’ fueling process or the details of how they move, but the result is a force to be reckoned with. For example, one such engine is a spring-like stalk connecting a single-celled organism called a vorticellid to the leaf fragment it calls home. When exposed to calcium, the spring contracts, yanking the vorticellid down at speeds approaching three inches (eight centimetres) per second.Springs like this are coiled bundles of filaments that expand or contract in response to chemical cues. A wave of positively charged calcium ions, for example, neutralizes the negative charges that keep the filaments extended. Some sperm use spring-like engines made of actin filaments to shoot out a barb that penetrates the layers that surround an egg. And certain viruses use a similar apparatus to shoot their DNA into the host’s cell. Ratchets are also useful for moving whole cells, including some other sperm and pathogens. These engines are filaments that simply grow at one end, attracting chemical building blocks from nearby. Because the other end is anchored in place, the growing end pushes against any barrier that gets in its way.Both springs and ratchets are made up of small units that each move just slightly, but collectively produce a powerful movement. Ultimately, Mahadevan and Matsudaira hope to better understand just how these particles create an effect that seems to be so much more than the sum of its parts. Might such an understanding provide inspiration for ways to power artificial nano-sized devices in the future? “The short answer is absolutely,” says Mahadevan. “Biology has had a lot more time to evolve enormous richness in design for different organisms. Hopefully, studying these structures will not only improve our understanding of the biological world, it will also enable us to copy them, take apart their components and recreate them for other purpose.”According to the author, research on the power source of movement in cells can contribute to
...