Related Questions

The popular notion that a tree's age can be determined by counting number of internal rings in its trunk is generally true. Howeevr, to help regulate the internal temperature of the tree, the outermost layers of wood of the Brazilian ash often →peel away when the temperature exceeds 95 degrees Fahrenheit, leaving the tree with fewer rings than it would otherwise have. So only if the temperature in the Brazilian ash's environment never exceeds 95 degrees Fahrenheit →elav eing the tree with fewer rings than it would otherwise have. So only if the reliable measure of the tree's age. Which of the following is an assumption on whish the argument above depends?
A The growth of new rings in a trees is not a function of levels of precipitation.
B Only the Brazilaian ash loses rings because of excessive heat.
C One day of temperatures above 95 degrees Fahrenheit will cause the Brazilian ash to lose one ring.
D The internal rings of all tress are of uniform thickness
For making fly-ash building bricks, the following mix of fly-ash, sand and lime, is
A 80 : 13 : 7
B 70 : 20 : 10
C 60 : 35 : 5
D None of these
Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.
A Coke and sand
B Brine and coal
C Coke and caustic soda
D None of these
Dense soda ash used in the manufacture of glass, is chemically represented by
A Na2CO3
B Na2CO3.10H2O
C Na2CO3.H2O
D Na2HCO3
Reaction of orthophosphoric acid with soda ash produces
A Sodium tripolyphosphate (STPP)
B Tricresyl phosphate
C Tributyl phosphate
D Nitrophosphate
Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.
A Plate
B Baffle
C Packed
D None of these
Raw materials for 'Solvay Process' for manufacture of the soda ash are
A Salt, limestone and coke or gas
B Ammonia, salt and limestone
C Ammonia limestone and coke
D None of these
Which of the following is not required in the manufacture of soda ash by Solvay process?
A Ammonia
B Limestone
C Nitric acid
D None of these
Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process?
A NH3
B NaCl
C CaO
D Coke
Lime and soda ash are added to water to remove
A Bicarbonates & sulphates of calcium and magnesium
B Undersirable taste and odour
C Bacteria
D Its corrosiveness

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