Physics XI Content




Heat and Temperature- Old is Gold

 

  1. Two bodies made of the same material have the same external dimensions and appearance, but one is solid and the other is hollow. When they are heated, is the overall volume expansion the same or different?
  2. Metal knob of door is colder than wooden parts at the same temperature. Why?
  3. Water level initially falls in a vessel when it is heated. Why?
  4. Why is it sometimes possible to loosen caps of screw top bottles by dipping the cap briefly in hot water?
  5. Why do frozen pipe brusts?
  6. Explain why a column of mercury in thermometer first descends slightly and then rises when placed in hot water?
  7.  Does the coefficient of linear expansion depend on length? Explain.
  8. Why is mercury used commonly as a thermometric substance? Give two reasons.
  9. What are the differences between heat and temperature?
  10. At what point of thermometric scale does Kelvin scale reading coincide with Fahrenheit scale reading?
  11. Why a column of mercury in a thermometer first descends slightly and then rises when placed in hot water? Explain.
  12. Why does a thick glass tumbler crack when boiling water is poured on it?
  13. Why are glass windows possible to be cracked in very cold region?
  14. When a metallic block with hole in it is heated, why does not the material around the hole expand into the hole and make it smaller?
  15. Define absolute temperature.
  16. At what temperature, do the Fahrenheit-thermometer and Celsius-thermometer show the same reading?