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ByEdMo   posted on01 May, 12 7398 Views 0 Comments General Knowledge Add to favorite

Q-6: D The Sahara (Arabic: al-koubra), “The Great Desert”, at over 9,000,000 sq. km., covers most parts of Northern Africa; an area stretching from the Red Sea, including parts of the Mediterranean coasts, to the outskirts of the Atlantic Ocean. It is almost as large as the continental United States, and is larger than Australia. The Sahara covers huge parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia.

Q-7: D Johanna Spyri (June 12, 1827 – July 7, 1901) was an author of childrens’ stories, and is best known for Heidi. Born Johanna Louise Heusser in the rural area of Hirzel, Switzerland, as a child she spent several summers in the area around Chur in Graubunden, the setting she later would use in her novels. Heidi is a story focusing on events in the life of the title character, a young orphan, in Switzerland. Two sequels, Heidi Grows Up and Heidi’s Children, were not written by Spyri but by her English translator, Charles Tritten. The Hiedi books are one of the best known works of Swiss literature.

Q-8: B Rene-Theophile-Hyacinthe Laennec (February 17, 1781 – August 13, 1826), French physician; inventor of the stethoscope. Fr. Laennec was born in Quimper, Brittany and studied medicine at the Hopital de la Charite, Paris qualifying in 1804. He invented the stethoscope in 1816, while working at the Hopital Necker. The stethoscope (Greek: stethos – chest and, skope – examination) is an acoustic medical device for auscultation, or listening to internal sounds in a human or animal body. It is most often used to listen to heart sounds and breathing. It is also used to listen to intestines and blood flow in arteries and veins.

Q-9: B Rogun Dam is being built primarily for irrigation and hydropower. It will be a 335-metre-high, earth/rock fill dam with the capacity to produce 3,600 MW of electricity. Considered the world’s highest dam, this project is also located in a zone of high seismic and tectonic activity.

Q-10: B Liquid hydrogen is the liquid state of the element hydrogen. It is a common liquid rocket fuel for rocket applications. In the aerospace industry, its name is often abbreviated to LH2. To exist as a liquid, H2 must be pressurized and cooled to a very low temperature, 20.27 K (-423.17F/-252.87C.) Once liquefied, it can be maintained as a liquid in pressurized and thermally insulated containers. In rocket engines, liquid hydrogen is frequently used as a coolant to cool the engine nozzle (regenerative cooling) and other parts before being mixed with the oxidizer (often liquid oxygen (LOX)) and burned. The resulting exhaust of such LH2 – LOX engines is very clean water with traces of ozone and hydrogen peroxide.

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