In a hydro power plant

Ocean thermal energy is due to

The power generate in a wind mill

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

Choose the incorrect statement

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

What is a nuclear reactor?

Name the gas which is the major constituent of bio gas?

What are fossil fuels?

Which is the ultimate source of energy?

What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?

Hydrogen compounds are abundantly available on earth and it has high calorific values. But this is not used as a common fuel. Give any two reasons. What are being developed to use hydrogen as a common fuel?

Energy can neither be created nor destroyed. Then why is there so must about energy crisis?

What steps would you suggest to minimize environment pollution caused by burning of fossil fuels?

What are the limitations in obtaining energy from wind?

List any four characteristics of biogas on account of which it is considered an ideal fuel

Define a 'nuclear fusion reaction'. Describe the conditions for the occurrence of a nuclear fusion reaction.

(a) What is a 'solar cell'?
(b) Why is biogas considered an ideal fuel for domestic use?
(c) Name a device in which controlled chain reaction is used.

(a) State one limitation of solar energy available from solar cells.
(b) What is the minimum wind velocity required to obtain useful energy with a windmill?
(c) Define the term 'nuclear fission'.

a) How can solar energy be harnessed?
b) Mention any two limitations in using solar energy.
c) How are these limitations overcome?

a) Why is there a need for harnessing non-conventional sources of energy?
b) How can energy be harnessed from the sea in different ways?

(i) Write the value of solar constant of Sun.
(ii) What type of mirror is used in Box Type Solar Cooker?
(iii) Why it is difficult to use hydrogen as a source of energy?
(iv) Fossil fuels are classified as non-renewable source of energy. Explain why.

(i) Distinguish between renewable and non-renewable sources of energy giving one example of each.
(ii) Why is the use of wood as a fuel not advised although forests can be replenished?