1. A good fuel is one that possesses:

2. There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has:

3. Coke is more valuable when used:

4. In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because:

5.  In order to make efficient solar cooker, the cover of cooker box should be made of:

6. The diagram shows a simple calorimeter system for measuring the heat given out by a liquid fuel contained in the burner. The experimental data for four fuels A, B, C and D is given below. 100 ml (100g) of water was put in the calorimeter and a thermometer is used to measure the change in temperature. With the help of the data find the fuel which is the least efficient?

7. The process by which energy is produced in the sun is

8. The major constituent of biogas is

9. The radiation present in the sunlight that gives us the feeling of hotness is

10. The energy efficient device for producing light is: