VERY SHORT QUESTIONS WITH ANSWERS (1 MARK) (ii) No residue is left after it has burnt itself out. i) The initial cost is high. ii) It causes displacement of people from large areas of land.
(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)what is the maximum temperature attained in a concave reflector type solar cooker? (v)Fossil fuels are classified as non-renewable source of energy. Explain why. (iii) It cannot be stored safely as (a) it burns with explosion and(b) has low ignition temperature. (iv) about 200oC. (v)fossil fuels cannot be replenished. It takes millions of years for their formation. (b) Why is the energy of water flowing in a river considered to be an indirect form of solar energy? (c) Write one advantage of nuclear fission reaction.
Q.6. A student has set up a solar cooker in a box by using a black painted aluminum sheet, a black cooking vessel, some glass wool, a glass sheet and a mirror plate. What is the role of each item used in the solar cooker?
16 Comments
harsh
30/6/2012 02:11:11 am
good question answer i like it
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sahil
14/7/2012 03:34:26 pm
I have one question it is for 5 marks can you please tell me the answer the question is
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chinmay
25/12/2014 08:42:21 am
yes i know it .A solar cooker consists of a rectangular wooden box ,which is lined from inside with some insulating materials,such as thermocol or glass wool.the insulating material prevents heat losses due to conduction,convection &radiation.All the inside surface is painted black,because black colour is good absorbers of heat.The glass sheet is placed on the top of the box ,which allow the enter the box but does not let it flow out.A clamp is attached to plane mirror for adjusting the angle.The solar cooker is used for only cooking food ,it can't be used for cooking the food items those who require low heat. After 3 or 4 hours the temperature in cooker will rises about to 100 to 140 degrees.
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rrrrr
19/8/2012 09:45:05 am
intresting notes
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rishit
20/9/2012 07:48:15 am
niceeeee...
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siddhant singhai
9/9/2013 11:59:51 am
thank u 4 it
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22/8/2014 10:21:12 am
Dear sir,
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chinmay
25/12/2014 08:43:45 am
good.
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ashish koli
26/4/2015 10:42:43 am
Cool yar this help me a lot to study.....
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Kumari Shivangi Chandel
28/5/2016 12:47:52 pm
Very important questions. Helpful for exam............
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ruhani
5/7/2016 11:59:56 am
very helpful notes
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Ashish
14/9/2016 09:16:17 am
go for social network
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aanaya
1/11/2016 05:13:54 pm
I couldn't find the answer which I need
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