|
What is biomass? What can be done to obtain bio-energy using biomass?
|
|
1
|
2482
|
April 4, 2019
|
|
(i) What is biogas? Name two main combustible components of biogas?
|
|
1
|
1362
|
April 4, 2019
|
|
(a) Name the device used to convert: 1. Solar energy into heat
|
|
1
|
564
|
April 4, 2019
|
|
Compare and contrast bio-mass and hydro-electricity as source of energy
|
|
1
|
748
|
April 4, 2019
|
|
1. What is a ‘solar cell’?
|
|
1
|
602
|
April 4, 2019
|
|
1. State one limitation of solar energy available from solar cells
|
|
1
|
784
|
April 4, 2019
|
|
(a) Why is the solar cooker box covered with a plane glass plate?
|
|
1
|
830
|
April 4, 2019
|
|
What kind of mirror concave, convex or plane would be best suited for the use in a solar cooker? Why?
|
|
1
|
830
|
April 4, 2019
|
|
What is biogas? How can biogas be obtained?
|
|
1
|
1697
|
April 4, 2019
|
|
What is meant by the calorific value of a fuel? How is it determined?
|
|
1
|
594
|
April 4, 2019
|
|
Name three forms in which energy from oceans is made available for use. What are OTEC power plants?
|
|
1
|
1018
|
April 4, 2019
|
|
Suggest two ways to reduce energy consumption
|
|
1
|
731
|
April 4, 2019
|
|
What is geothermal energy? Write its advantage
|
|
1
|
623
|
April 4, 2019
|
|
What steps would you suggest to minimise environmental pollution caused by burning of fossil fuels?
|
|
1
|
1500
|
April 4, 2019
|
|
What are fossil fuels? Write two disadvantages of buring fossil fuels
|
|
1
|
482
|
April 4, 2019
|
|
How is charcoal obtained from wood? Why is charcoal considered as a better fuel than wood?
|
|
1
|
1466
|
April 4, 2019
|
|
What is biogas? Why is biogas considered as ah ideal fuel for domestic use?
|
|
1
|
2345
|
April 4, 2019
|
|
(a) Distinguish between renewable and non-renewable sources of energy
|
|
1
|
738
|
April 4, 2019
|
|
Discuss one limitation each for the extracting of energy from: (a) wind. (b) tide
|
|
1
|
771
|
April 4, 2019
|
|
List any four characteristics of bio gas on account of which it is considered as an ideal fuel
|
|
1
|
1503
|
April 4, 2019
|
|
What is the use of the black painted surface in solar heating devices?
|
|
0
|
1852
|
March 16, 2018
|
|
Give an example of indirect harnessing of solar energy
|
|
0
|
1835
|
March 16, 2018
|
|
State the important uses of wind energy
|
|
0
|
889
|
March 16, 2018
|
|
Write two advantages of classifying energy sources as renewable and non- renewable
|
|
0
|
3764
|
March 16, 2018
|
|
Why is tidal energy not likely to be a potential source of energy?
|
|
0
|
1098
|
March 16, 2018
|
|
Why is it not possible to make use of solar cells to meet all our energy needs?
|
|
0
|
4494
|
March 16, 2018
|
|
How is nuclear energy generated during nuclear fusion?
|
|
0
|
1533
|
March 16, 2018
|
|
Firewood is a conventional fuel
|
|
0
|
783
|
March 16, 2018
|
|
State two advantages and two disadvantages of geothermal energy
|
|
0
|
860
|
March 16, 2018
|
|
What is biogas?
|
|
0
|
6102
|
March 16, 2018
|