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Questions
Write the problems associated with hydroelectric power projects.
Write two problems associated with hydroelectric power plant.
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Solution
- The back-water due to storage of water in a dam may submerge villages or towns in that area. This leads to the problems of rehabilitation of the displaced population. Moreover, this can also submerge forests as well as fertile land.
- The obstruction of the flow of river water may have an adverse effect on the living world in the river.
RELATED QUESTIONS
The calorific value and ignition temperature of fuel A are 55 kJ/g and 80°C, respectively. These values for fuel B are 80 kJ/g and 10°C, respectively. On burning, the fuel A produces CO2 and H2O while the fuel B produces CO2 , CO and SO2. Give three points of relative and disadvantages of these two fuels.
The calorific values of five fuels A, B, C, D and E are given below:
| A | 48KJ/g |
| B | 17KJ/g |
| C | 150KJ/g |
| D | 50KJ/g |
| E | 30KJ/g |
Why are very high temperatures required for fusion to occur?
If 25 atomic mass units (u) of a radioactive material are destroyed in a nuclear reaction, how much energy is released in MeV?
In the nuclear reactor of a power plant:
how do control rods control the rate of fission?
Calculate the energy released in joules when 5 g of a material is completely converted into energy doing a nuclear reaction.
One atomic mass unit (u) is equivalent to an energy of:
A nuclear power plant is working normally. What would you do if the reactor core suddenly got too hot?
Give a scientific reason.
The construction of turbine is different for different types of power plants.
Name the following nuclear reaction:
\[\ce {^3_1H + ^2_1H -> ^4_2He + ^1_0n + γ}\]
Assertion (A): In the process of nuclear fission, the amount of nuclear energy generated by the fission of an atom of uranium is so tremendous that it produces 10 million times the energy produced by the combustion of an atom of carbon from coal.
Reason (R): The nucleus of a heavy atom such as uranium, when bombarded with low energy neutrons, splits apart into lighter nuclei. The mass difference between the original nucleus and the product nuclei gets converted to tremendous energy.
The nucleus 84X202emits an alpha particle and forms the nucleus Y. Represent this change in the form of an equation.
Explain briefly what changes take place within the nuclei when beta particles are emitted by a radioactive substance.
State the energy conversion taking place in a solar cell.
Draw a simplified labelled diagram of a hot cathode ray tube.
Explain, why nuclear fusion is not being used to meet day to day energy needs.
Define.
Nuclear fission
Write the merits of nuclear energy.
Give a scientific reason.
It is absolutely necessary to control the fission reaction in nuclear power plants.
Why is nuclear fission useful to mankind?
