2021.
The following enhances the coring
A
Minute difference between liquids and solids
B
Marked difference between liquids and solids
C
Either
D
None
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The following enhances the coring
Minute difference between liquids and solids
Marked difference between liquids and solids
Either
None
Macro-segregation can be removed by
Annealing
Hot working
Both
None
The following phenomena are useful in zone-refining process
Coring
Segregation
Both
None
The most influencing factor of diffusivity
Diffusing species
Temperature
Lattice structure
Presence of defects
Example for steady-state diffusion
Hydrogen purification by palladium sheet
Doping semi-conductors
Corrosion resistance of duralumin
Decarburization of steel
Not an example for short-circuit path
Vacancy
Dislocations
Grain boundaries
External surfaces
The following mechanism contributes very little the diffusivity
Vacancy
Interstitial
Substitutional
Self-interstitial
The value of error function for 8 is
-8
-1
1
8
Probably the fastest diffusing species in Fe is
H
Ni
W
C
Diffusion can occur in ....................... materials
Solid
Liquid
Gaseous
All
Which of the following is not a reason for cutting down trees?
Fuel use
To provide land for farming
For building materials
For use as a biofuel
Which is NOT a factor contributing to the loss of biodiversity?
The planting of trees
Urbanization
Climate Change
Over-exploitation of species
Which gas is likely to be reduced in the atmosphere by deforestation?
Carbon dioxide
Nitrogen
Oxygen
Sulphur dioxide
What is deforestation?
Product of forest
destruction of forest
Forest Protection
None of the above
The method of simultaneous integration of trees with agricultural crops is called
Agro forestry
Deforestation
Reforestation
combined culture
Soil erosion can be prevented by
Deforestation
Afforestation
Overgrazing
Removal of vegetation
How much of the Earths land is covered by forests?
5%
10%
16%
31%
How many trees does it take to provide a day supply of oxygen for 4 people?
1
10
50
100
Extensive planting of trees to increase forest cover is called
Afforestation
Agroforestry
Deforestation
Social forestry
Deforestation takes place by
Human activities
Only by natural resources
Both of these
None of these