important question !!
class X
1. The cost of production of electricity in thermal power station in Bihar is lesser than in Gujarat. Prove this statement by giving reasons.
2. Out of two solar cookers, one was covered and the other one was left open. Which one of the two will be more efficient and why?
3. The surface area of concentrator type solar heater is 5m2. It can reflect 80% of solar radiation incident while it absorbs the rest. Calculate energy concentrated by heaters as it focus in 2 hours if solar energy was delivered to it at the rate of 0.4 kJ/m2s
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Answer 1
Yes, it is so because in Bihar/Jharkhand/Odhisa coal for thermal power plants is easily avilable, whereas it has to be transported to the thermal power plants in Gujrat/Maharastra which could be costly.
Answer 2
Out of two solar cookers, one was covered by a plane glass slab and the other was left open. ... The solar cooker covered by plane glass slab will be more efficient than the one which is left open. This is due to the reason that the plane glass slab enables the cooker to trap heat inside it.
Answer 3 is given in the attachment
I hope this will help you...
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