|
What is biomass? What can be done to obtain bio-energy using biomass?
|
|
1
|
2558
|
April 4, 2019
|
|
(i) What is biogas? Name two main combustible components of biogas?
|
|
1
|
1418
|
April 4, 2019
|
|
(a) Name the device used to convert: 1. Solar energy into heat
|
|
1
|
607
|
April 4, 2019
|
|
Compare and contrast bio-mass and hydro-electricity as source of energy
|
|
1
|
799
|
April 4, 2019
|
|
1. What is a ‘solar cell’?
|
|
1
|
649
|
April 4, 2019
|
|
1. State one limitation of solar energy available from solar cells
|
|
1
|
830
|
April 4, 2019
|
|
(a) Why is the solar cooker box covered with a plane glass plate?
|
|
1
|
887
|
April 4, 2019
|
|
What kind of mirror concave, convex or plane would be best suited for the use in a solar cooker? Why?
|
|
1
|
882
|
April 4, 2019
|
|
What is biogas? How can biogas be obtained?
|
|
1
|
1764
|
April 4, 2019
|
|
What is meant by the calorific value of a fuel? How is it determined?
|
|
1
|
648
|
April 4, 2019
|
|
Name three forms in which energy from oceans is made available for use. What are OTEC power plants?
|
|
1
|
1080
|
April 4, 2019
|
|
Suggest two ways to reduce energy consumption
|
|
1
|
775
|
April 4, 2019
|
|
What is geothermal energy? Write its advantage
|
|
1
|
673
|
April 4, 2019
|
|
What steps would you suggest to minimise environmental pollution caused by burning of fossil fuels?
|
|
1
|
1542
|
April 4, 2019
|
|
What are fossil fuels? Write two disadvantages of buring fossil fuels
|
|
1
|
553
|
April 4, 2019
|
|
How is charcoal obtained from wood? Why is charcoal considered as a better fuel than wood?
|
|
1
|
1520
|
April 4, 2019
|
|
What is biogas? Why is biogas considered as ah ideal fuel for domestic use?
|
|
1
|
2423
|
April 4, 2019
|
|
(a) Distinguish between renewable and non-renewable sources of energy
|
|
1
|
796
|
April 4, 2019
|
|
Discuss one limitation each for the extracting of energy from: (a) wind. (b) tide
|
|
1
|
822
|
April 4, 2019
|
|
List any four characteristics of bio gas on account of which it is considered as an ideal fuel
|
|
1
|
1570
|
April 4, 2019
|
|
What is the use of the black painted surface in solar heating devices?
|
|
0
|
1920
|
March 16, 2018
|
|
Give an example of indirect harnessing of solar energy
|
|
0
|
1885
|
March 16, 2018
|
|
State the important uses of wind energy
|
|
0
|
935
|
March 16, 2018
|
|
Write two advantages of classifying energy sources as renewable and non- renewable
|
|
0
|
3803
|
March 16, 2018
|
|
Why is tidal energy not likely to be a potential source of energy?
|
|
0
|
1150
|
March 16, 2018
|
|
Why is it not possible to make use of solar cells to meet all our energy needs?
|
|
0
|
4561
|
March 16, 2018
|
|
How is nuclear energy generated during nuclear fusion?
|
|
0
|
1567
|
March 16, 2018
|
|
Firewood is a conventional fuel
|
|
0
|
831
|
March 16, 2018
|
|
State two advantages and two disadvantages of geothermal energy
|
|
0
|
921
|
March 16, 2018
|
|
What is biogas?
|
|
0
|
6148
|
March 16, 2018
|