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ICSE 2009 Solved Important Papers of Physics By Mr. M.P.Keshari

ICSE Guess > ICSE Papers > Important Questions > Class X > 2009 > Physics > Physics By Mr. M.P.Keshari

Heat (Solved)

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Question .1. (i) Define specific latent heat of vaporisation.

(ii) Draw a labelled diagram of the apparatus you would use to determine the specific latent heat of vaporisation of steam by the method of mixture.

(iii) State two precautions you would take while performing the experiment with the apparatus.

(iv) In an experiment to determine the specific latent heat of vaporisation of steam L, the following measurements were taken :

Mass of calorimeter + stirrer = x kg

Mass of water = y kg

Initial temperature of water = t1ºC

Final temperature of mixture = t2ºC

Given : Specific heat capacity of calorimeter and water are S1 and S2 respectively. Express L in terms of above data. Mass of condensity (steam condensed) = m kg.


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Question .2. Which material is the calorimeter commonly made of?


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Question .3. Give two reasons as to why copper is preferred over other metals for making calorimeter.

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Question .4. Define the term specific heat capacity of a substance. Give its SI unit.


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Question .5. Define specific latent heat of fusion of ice. Give its SI unit.


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Question .6. Explain briefly: Why hot water bottles are very efficient for fomentation?  

 
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Question .7. What is the effect of increase in pressure on the melting point of ice and boiling point of water?


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Question .8. Explain why bottled soft drinks are more effectively cooled by cubes of ice than by ice water.


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Question .9. Explain why the surroundings become pleasantly warm when water in a lake starts freezing in cold countries.


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Question .10. If, in a central heating system, steam enters a radiator pipe at 100 ºC and water leaves the radiator pipe at 100 ºC, can this radiator pipe heat a room? Give an explanation for your answer.


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Question .11. It takes a much longer time to boil off (change to steam) a certain quantity of water, rather than to bring it to its boiling point from room temperature, say 25 ºC. Explain the reason for this.


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Question .12. Explain why one feels ice cream at 0 ºC colder than water at 0 ºC.


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Question .13. Give one example of each where high specific heat capacity of water is used (i) in cooling and (ii) as heat reservoir.

Or,

Explain why water is used in hot water bottles for fomentation and also as a universal coolant.


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Question .14. Does land cool at a slower or faster rate than water? Give one reason for your answer.


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Question .15. Explain why steam pipes warm a building more effectively than hot water pipes in cold countries.


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Question .16. In winter, the weather forecast for a certain day was ‘severe frost’. A wise farmer watered his fields the night before to prevent frost damage to his crops. Why did he water his fields?     


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Question .17. State the principle of Calorimetry.

Or,

What is the principle of Calorimetry?


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Question .18. Which of the two , 1 g of ice at 0 ºC or 1 g of water at 0 ºC contains more heat? Give reason for your answer.


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Question .19. Why are burns caused by steam more severe than those caused by boiling water at the same temperature?


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Question .20. Why does the heat supplied to a substance during its change of state not cause any rise in its temperature?

 

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Paper By Mr. M. P. Keshari [ For Further Enquiry 09434150289]

 

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