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
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
A 15 to 25
B 35 to 45
C 55 to 75
D 75
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
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.
A 500
B 750
C 950
D 1100
Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be
A Oxidising
B Neutral
C Either A or B
D Neither A nor B
The ability of a material to resist softening at high temperature is known as
A Creep
B Hot tempering
C Hot hardness
D Fatigue
A material is capable of resisting softening at high temperature, because of its property termed as
A Hot temper
B Hot hardness
C Fatigue
D Creep
Fusion point of coal ash increases with increase in its __________ content.
A Iron sulphate
B Iron silicate
C Lime and magnesia
D All of the above
The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.
A Red
B Extended
C Super
D Extreme
__________ test is done to find out the softening point of bitumen.
A Impact
B Ball and ring
C Flame
D Viscosity

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