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Particulate Nature of Matter
Intensive investigation by scientists over the years led to the development of a mental model (the minuscule particles couldn't be actually seen at that time) known as 'dynamic particle model'. All matter is assumed to be made up of particles that are very small, which may be a..
Rajendra Singh
known as 'water man', has developed a technique for harvesting rainwater and also revived the age-old technique of collection of rainwater in dams to increase water table. For this outstanding contribution, he got the Magsaysay award in 2001. There is an urgent need to avoid t..
Why do we Fall ill - Test Questions
Question 1 - Question: A scientist in CDRI, Lucknow developed an anti-cerebral malarial drug called A from a plant B. Identify A and B. Answer: A : Arteether B : Artemisia ann..
Question 9
Question: What direct value does a forest have for man? Answer: Forests contribute to the economic development of our country by providing goods and services to people and industry. They are intimately linked with our culture and civilization. Forests are useful to hu..
Structure of Atom
. In 1793, he left for Manchester to teach physics and chemistry in a college. In 1801, he observed and discovered the law of expansion of gases on heating. He also enunciated the law of partial pressures and found methods of determining vapour pressure of gases. He invented the dew point hygromete..
. In 1793, he left for Manchester to teach physics and chemistry in a college. In 1801, he observed and discovered the law of expansion of gases on heating. He also enunciated the law of partial pressures and found methods of determining vapour pressure of gases. He invented the dew point hygromete..The Need to Manage Our Resources
. As a result large scale soil erosion and local climate change have occurred. Air pollution due to automobile exhausts and industrial emission levels has caused green house gases to rise and cause global warming. All these have combined to deplete and endanger some of our most valuable natural res..
Named After Scientists
Curium (Cm) after Pierre and Marie CurieFermium (Fm) after Enrico FermiEinsteinium (Es) after Albert EinsteinMendelevium (Md) after Dimitri Mendel..
Achievements of Mendeleev's Periodic Table
Mendeleev's periodic table was one of the greatest achievements in chemistry with some of its important contributions as follow..
Question 1
Question: Why were the scientists not able to observe most of the cell organelles before 1940? Answer: Before 1940, scientists could view the cell only under a light microscope. The invention of the electron microscope in 1940 enabled the scientists to obse..
Control
No effective vaccine for AIDS has been developed so fa..
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