158 Domestic Science 



QUESTIONS 



1. Devise and explain an experiment to show that, in deter- 

 mining the temperature of a body, misleading evidence may be 

 obtained by trusting solely to one's bodily sensations as a guide. 



2. To which state of matter do you consider the softened glass 

 from which a thermometer bulb is blown to belong, and why ? 



3. Give reasons for the following observations made in Experi- 

 ment 46 : 



(a) The escape of bubbles through the coloured alcohol when 

 the bulb is placed in warm water. 



(6) The passage of the alcohol into the tube and bulb when 

 the heating of the latter is discontinued. 



(c) The filling of the bulb being almost complete after its 

 second heating. 



4. The average temperature of human blood in the living subject 

 is 98 '4 F. Express this in degrees Centigrade and in degrees 

 Reaumur. 



5. The boiling-points of mercury and of air are respectively 

 357 C. and 192 C. What are the corresponding temperatures 

 on the Fahrenheit scale ? 



6. Suggest the probable reason for the statement that it is 

 not easy to make a good cup of tea at the top of a high mountain. 



7. Which has the higher temperature a gallon or a pint of 

 boiling water ? Support your opinion by writing out your arguments 

 in favour of it. 



8. A vessel containing hot water is placed under the receiver 

 of an air-pump, and the pump put into action. What would you 

 expect to happen, and why ? 



9. In a room without a fire the fender seems to be colder than 

 the door, and the door colder than the carpet. By what experiments 

 would you test the accuracy or otherwise of these observations ? 



10. At what temperature will the volume of a mass of air, 

 which occupies 562 c.c. at 20, become (a) 659 c.c. ; (6) 340 c.c. ? 



11. A litre flask, fitted with a cork and delivery tube, is placed 

 in a vessel and surrounded by melting ice, the end of the delivery 

 tube being left open to the air. After ten minutes the end of the 



