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?
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I am a school teacher and serving CBSE students community since 1995.