Suggest any two reasons which make the large scale usage of nuclear energy prohibitive.

Thermal power plants are set up near coal or oil fields. Give reason.

What type of microorganisms are able to carry out the process of decomposition in a biogas plant?

List any two steps you would suggest to minimise environmental pollution caused by burning of fossil fuels.

What type of energy is possessed by huge waves near the seashore?

A student constructed a model of box-type solar cooker. Instead of using glass sheet he used a transparent plastic sheet to cover the open face of the box. He found that this cooker does not function well. What could be the possible drawbacks in his model? Explain the advantage of painting black the inner and outer surfaces of the cooker and that of cooking vessels.

Give the disadvantages of constructing big dams across the river. How does construction of dams across the river get linked with production of greenhouse gases?

Mention three advantage of a solar cell.

Why is there a need to harness non-conventional sources of energy? Give two main reasons.

What is meant by nuclear waste? State the main hazard of this waste on the living beings. How is this waste disposed of?

Name the reaction responsible for large energy production in the sun.

List any four reasons why we need to look for alternate sources of energy.

How has the traditional use of wind and water energy been modified for our convenience?

What is biomass? What can be done to obtain bio-energy using biomass?

Nuclear power is an excellent non-conventional source of energy still it is not used commonly for power generation. Why? State three reasons.

How is nuclear energy generated? Give one use of nuclear energy?

(a) What is geothermal energy?

(b) What are the advantages of wind energy?

Why is it not possible to make use of solar cells to meet all our energy needs? State at least three reasons to support your answer.

Name the various forms in which energy is available from the sea. For any two types give one limitation in harnessing.

What are the factors that should be taken into consideration for selecting a source of energy? List any three.