1.

(a) Hydrogen is used as a rocket fuel. Why ?(b) List two limitations of using solar cookers.

Answer»

(a) Hydrogen is comparatively a cleaner fuel than any other gaseous fuel, as on its burning only water is produced which does not pollute the environment. 

(b) (i) Cannot be used in nigh/cloudy days.

(ii) Direction of the reflector has to be changed from time to time.



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