TOPIC 2 TEMPERATURE AND HEAT Exam questions Ordinary Level
2012 9. The temperature of an object is a measure of its hotness or coldness. (i) What is the SI unit of temperature?
(6)
(ii) The Celsius scale is the practical temperature scale. How is the degree Celsius (°C) related to the SI unit of temperature? (6)
When heat is transferred to a substance, it causes a rise in temperature or a change in state of the substance, or both.
(iii) What is heat? (iv) Name the three methods of heat transfer.
(v) What is meant by the change in state of a substance? (vi) Define specific latent heat.
20 g of ice cubes at 0 °C are added to a glass of warm water. All the ice melts quickly and cools the water to 5 °C. Assuming no heat transfer to the surroundings or to the glass, calculate: (vii) the energy required to melt the ice
(viii) the energy required to warm the melted ice to 5 °C (ix) Why is it imfrtant to stir the mixture?
2011 8. (a) (i) What is meant by a thermometric property?
(ii) Name two different thermometric properties. (iii) Name two different thermometers. (iv) Describe how to calibrate a thermometer. (v) Why is there a need for a standard thermometer?
(6) (6) (3) (6)
(9) (9) (5)
(specific heat capacity of water = 4180 J kg–1 K–1; specific latent heat of fusion of ice = 3.34 × 105 J kg–1)
