Q1. How is the slurry left in a bio-gas plant in the end, used?
Q2. Name any two elements that are used in fabricating solar cells.
Q3. What are the causes of ocean thermal energy?
Q4. What is the major problem in harnessing nuclear energy?
Q5. List two characteristics of a good source of energy.
Q6. Mention any two limitations of using fossil fuels.
Q7. Name the two major components present in the left-over slurry of a biogas plant.
Q8. Why is a solar cooker painted black from outside?
Q9. Mention the main purpose of using a plane mirror in solar cookers.
Q.10. Mention two different ways of harnessing energy from ocean.
Q11. Write the energy conversion that takes place in hydropower plant.
Q12. State the reason tor considering fossil fuels as non-renewable sources of energy.
Direction (Q.No. 13-17)In each of the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as
(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) If Assertion is true, but Reason is false.
(d) If Assertion is false, but Reason is true.
(e) If Assertion and Reason both are false.
Q13. Assertion: Many thermal power plants are set up near coal or oil fields.
Reason: It is more efficient to transmit electricity than to transport coal or petroleum over the same distance.
Q14. Assertion: In a wind energy farm, a number of windmills are erected over a large area.
Reason: The energy output of a single windmill is large and can be used for commercial purposes.
Q15. Assertion: The slurry left behind is removed periodically and used as excellent manure, rich in nitrogen and phosphorous.
Reason: The large-scale utilisation of bio-waste and sewage material provides a safe and efficient method of waste-disposal besides supplying energy and manure.
Q16. Assertion: Our energy requirements increase with our standard of living.
Reason: The only way to manage energy demand is to produce more energy.
Q17. Assertion: Solar cells can be used to solve energy needs of areas which are not near the source of Electricity production.
Reason: The use of Solar cells is not widespread because of their high cost.
Q18. Which one of the following sources of energy was most common in ancient times?
Q19. Why is bio-gas considered an excellent fuel?
(a) It burns without smoke
(b) It leaves no residues
(c) Its heating capacity in high
(d) All of the above
Q20. Which of the following sources of energy is a conventional source of energy?
(c) Fossil fuel
Q21. Which of the following chemical elements is used for making solar cells?