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Better coal should have following characteristics
(1) It should have high calorific value.
(2) It should have low moisture content.
(3) It should have low ash content
(4) It should have high calorific intensity. (Calorific intensity-maximum temperature attainable on complete combustion of coal with theoretical amount of air.)
(5) Size of coal should be uniform.
(6) Coking quality should be high (coal on heating gives a coke which is porous, hard, strong. And suitable for metallurgical needs, then the coal is known as caking coal)
(7) It should have very low content of sulphur and phosphorous.
Determine about the Secondary minerals Secondary minerals are formed under conditions of temperature and pressure found at the Earth's surface by the weathering of pre-existi
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Elephentiasis It is a disease seen all over the world. The adult worm lives in the lymph glands and the lymph vessels of man. As the number of worms increases, they bl
DEMOGRAPHIC CYCLE - 1 . First stage - B high - D high = 0 2 . Second stage - B high - D lo w = G more eg.
E. coli strains containing the plasmid pAMP are resistant to ampicillin. Describe how this plasmid functions to bring about resistance.
Why are the tropical forests also known as stratified forests? In tropical forests tall trees of various species have their crowns forming a superior layer under which diverse
A complete motor neuron is removed from a frog and placed in a large volume of normal physiological saline. The neuron is healthy; it has a stable resting voltage of -70 millivolt
What are the main human diseases caused by virus? Between diseases caused by virus are common cold, flu, mumps, variola (considered eradicated nowadays), rubella, AIDS, measles
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