Name two dams/projects which faced opposition over their construction from the local public.

Name the largest component of bio-gas.

List two practical uses of bio-gas in rural areas.

Which power plant works on the earth gravity?

Name the ultimate source of energy of fossil fuels.

Which part of the solar energy is responsible for heating the surfaces?

Name the energy obtained from sea or ocean water due to the difference in temperature at the surface and in deeper sections of these water bodies.

Name the energy resource which can be utilized in the treatment of cancer.

Which isotope of uranium can undergo fission readily?

The increase in demand for energy is affecting our environment adversely. List two such effects.

What are the criteria you would consider when trying to categorise something as a good fuel?

How does burning of fossil fuels cause air and soil pollution?

It is advantageous to convert bio-mass into a bio-gas rather than burning bio-mass directly. Why?

How is the supply of electricity maintained by a wind mill when there is no wind? By a solar panel when there is no sun?

State the energy conversion taking place in the solar cell panel. For what purpose, solar cell panel is used? State its two main advantages.

List in tabular form three distinguishing features between a thermal power plant and a geothermal power plant.

(a) Name two elements which can be used for generation of electricity in a nuclear power plant.

(b) Why could many nuclear power plants not be installed in our country? Give two reasons.

(a) How does construction of dams across the river get linked with production of greenhouse gases?

(b) How do technological inputs improve the efficiency of bio-mass fuels?

(a) Bio-mass contains stored energy. Justify it.

(b) How does bio-gas plant help to reduce the problem of pollution?

What is meant by wind energy farm? Write one of its practical applications. Give any three limitations of using wind energy farm.

List three energy sources that are considered to be inexhaustible. State three reasons in support of your answer.

Mention why is it not possible to make use of solar cells to meet all our energy needs? State three reasons to support your answer. Also, mention three uses of solar cells.

(a) Which property of water in ocean enables it to act as a storehouse of solar energy?

(b) List three forms in which energy from ocean can be harnessed?

(c) How are they different from each other?

State the meaning of the term “hot spot” in the context of earth crust. Write one advantage and one limitation of utilizing energy obtained from the hot spots.

List any three hazards of nuclear waste. How does the disposal of nuclear waste pose a problem for the plant and animal life?

Aditya suggests his family to install a solar water heater at their residence. But some of the family members were in favour of installing an electric geyser. Ultimately the family got water heater installed.

(a) Which according to you was correct? Give two reasons in support of your answer.

(b) Mention two possible changes in the thinking of the family members because of the arguments given by Aditya.

Slippery surface between colliding tectonic plates resulted in a huge release of energy into the sea and this resulted in massive tsunami. The 2011 devastating tsunami rolled over many parts of Japan and caused huge damages. The disaster also caused the three reactors at Fukushima nuclear power plant to melt down which released dangerous harmful radiations into the surrounding areas and led to national power shortage.

(a) What could be the reason for damage in nuclear reactors?

(b) How did it affect the environment and the people?

(c) Do you think nuclear energy is a future source of energy?