|
What is biomass? What can be done to obtain bio-energy using biomass?
|
|
1
|
2552
|
April 4, 2019
|
|
(i) What is biogas? Name two main combustible components of biogas?
|
|
1
|
1413
|
April 4, 2019
|
|
(a) Name the device used to convert: 1. Solar energy into heat
|
|
1
|
602
|
April 4, 2019
|
|
Compare and contrast bio-mass and hydro-electricity as source of energy
|
|
1
|
793
|
April 4, 2019
|
|
1. What is a ‘solar cell’?
|
|
1
|
644
|
April 4, 2019
|
|
1. State one limitation of solar energy available from solar cells
|
|
1
|
824
|
April 4, 2019
|
|
(a) Why is the solar cooker box covered with a plane glass plate?
|
|
1
|
881
|
April 4, 2019
|
|
What kind of mirror concave, convex or plane would be best suited for the use in a solar cooker? Why?
|
|
1
|
876
|
April 4, 2019
|
|
What is biogas? How can biogas be obtained?
|
|
1
|
1755
|
April 4, 2019
|
|
What is meant by the calorific value of a fuel? How is it determined?
|
|
1
|
638
|
April 4, 2019
|
|
Name three forms in which energy from oceans is made available for use. What are OTEC power plants?
|
|
1
|
1074
|
April 4, 2019
|
|
Suggest two ways to reduce energy consumption
|
|
1
|
771
|
April 4, 2019
|
|
What is geothermal energy? Write its advantage
|
|
1
|
662
|
April 4, 2019
|
|
What steps would you suggest to minimise environmental pollution caused by burning of fossil fuels?
|
|
1
|
1536
|
April 4, 2019
|
|
What are fossil fuels? Write two disadvantages of buring fossil fuels
|
|
1
|
547
|
April 4, 2019
|
|
How is charcoal obtained from wood? Why is charcoal considered as a better fuel than wood?
|
|
1
|
1515
|
April 4, 2019
|
|
What is biogas? Why is biogas considered as ah ideal fuel for domestic use?
|
|
1
|
2408
|
April 4, 2019
|
|
(a) Distinguish between renewable and non-renewable sources of energy
|
|
1
|
790
|
April 4, 2019
|
|
Discuss one limitation each for the extracting of energy from: (a) wind. (b) tide
|
|
1
|
815
|
April 4, 2019
|
|
List any four characteristics of bio gas on account of which it is considered as an ideal fuel
|
|
1
|
1569
|
April 4, 2019
|
|
What is the use of the black painted surface in solar heating devices?
|
|
0
|
1917
|
March 16, 2018
|
|
Give an example of indirect harnessing of solar energy
|
|
0
|
1884
|
March 16, 2018
|
|
State the important uses of wind energy
|
|
0
|
928
|
March 16, 2018
|
|
Write two advantages of classifying energy sources as renewable and non- renewable
|
|
0
|
3802
|
March 16, 2018
|
|
Why is tidal energy not likely to be a potential source of energy?
|
|
0
|
1143
|
March 16, 2018
|
|
Why is it not possible to make use of solar cells to meet all our energy needs?
|
|
0
|
4556
|
March 16, 2018
|
|
How is nuclear energy generated during nuclear fusion?
|
|
0
|
1564
|
March 16, 2018
|
|
Firewood is a conventional fuel
|
|
0
|
830
|
March 16, 2018
|
|
State two advantages and two disadvantages of geothermal energy
|
|
0
|
915
|
March 16, 2018
|
|
What is biogas?
|
|
0
|
6142
|
March 16, 2018
|