Answer:
Advantages and disadvantages of
constructing dam for electricity generations are
(5)
Or
The differences between nuclear
fusion and fission are given below
S. No.
Advantages
Disadvantages
(i)
Hydel
power is renewable source.
A
lot of plants, animals and their habitat get submerged in water.
(ii)
Reservoirs
help in development of fishing industry.
The
downstream land becomes less fertile, sometimes barren.
(iii)
(iii)
Water can be stored for irrigation and purification.
A
large number of people are displaced. Construction of dam requires huge
capital investment.
(4)
Nuclear fusion cannot be used to meet
our daily demands because it generates tremendously large amount of heat.
It also requires high temperature and
pressure conditions to initiate the reaction. (1)
S.
No.
Nuclear
fusion
Nuclear
fission
(i)
Smaller
nuclei fuse to form bigger nucleus.
Bigger
nucleus splits to form two or more smaller nuclei.
(ii)
High
temperature and pressure are required to start reaction.
The
nucleus needs to be bombarded with neutron.
(iii)
Heat produced is higher than that produced in nuclear fission.
(iv)
No
radioactive byproducts are released.
Radioactive
byproducts are released.
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