Kerala Board Solutions for Chapter: Energy Management, Exercise 7: Let us assess

In a way most of the important energy sources of today can be said to be solar. Which of the following does not belong to the solar energy?

Which of the following is a green energy?

Write down the advantages and limitations of solar cooker.

Kerala has a long coastal land. Still, ocean is not considered as a major source of energy. Why?

The graph regarding the calorific value of certain fuels is given below. Analyse the graph and answer the following Questions.

Which fuel has the highest calorific value? Which has the lowest?

The graph regarding the calorific value of certain fuels is given below. Analyse the graph and answer the following Questions.

How many kilogram of dried cow- dung is to be burnt to obtain the same amount of heat produced when $1 \mathrm{kg}$ of LPG burns? (Given calorific value of LPG is $55000 \mathrm{kJ}/\mathrm{kg}$ and the calorific value of cow dung is $6000 \mathrm{kJ}/\mathrm{kg}$)

The graph regarding the calorific value of certain fuels is given below. Analyse the graph and answer the following question.

From the graph find out the most suitable fuel for household purpose. Justify your answer.