Ordinary Level Physics Long Questions: TEMPERATURE AND HEAT
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1 Ordinary Level Physics Long Questions: TEMPERATURE AND HEAT Temperature 2014 Question 7 (a) [Ordinary Level] The temperature of an object can be measured using a thermometer which is based on a suitable thermometric property. (ii) What is meant by temperature? (iii)give an example of a thermometric property. (iv) The SI unit of temperature is the kelvin. Give another temperature scale. (v) Express 310 K in the units of the scale you have named in part (iv) Question 9 [Ordinary Level] (i) When heat is transferred to or from an object the temperature of the object changes. What is heat? (ii) Name the three ways in which heat can be transferred. (iii)describe an experiment to show how heat is transferred in a liquid. (iv) The water in an electric kettle is heated by the element and its handle is made from an insulating material. How does the method of heat transfer in a liquid affect the positioning of the heating element in a kettle? (v) Why is the handle of a kettle made of an insulating material? (vi) Name an insulator suitable for use in the handle of a kettle Question 8 (a) [Ordinary Level] (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? 2009 Question 12 (b) [Ordinary Level] (i) What is meant by the temperature of a body? (ii) Name two scales that are used to measure temperature. (iii)what is the boiling point of water on each of these scales? (iv) The diagram shows a laboratory thermometer, what is its thermometric property? (v) Name one other type of thermometer and state its thermometric of property. (vi) Why is there a need for a standard thermometer? 1
![2008 Question 7 (a) [Ordinary Level] The temperature of an object is measured using a thermometer, which is based on the variation of its thermometric property. (i) What is meant by temperature?](/docs-images/89/98869158/images/2-0.jpg "(ii) What is the unit of temperature? (iii)give an example of a thermometric property. 2005 12 (a) [Ordinary Level] To calibrate a thermometer, a thermometric property and two fixed points are needed.")
2 2008 Question 7 (a) [Ordinary Level] The temperature of an object is measured using a thermometer, which is based on the variation of its thermometric property. (i) What is meant by temperature? (ii) What is the unit of temperature? (iii)give an example of a thermometric property (a) [Ordinary Level] To calibrate a thermometer, a thermometric property and two fixed points are needed. (i) What does a thermometer measure? (ii) What are the two fixed points on the Celsius scale? (iii) Explain the term thermometric property. (iv) Name the thermometric property used in a mercury thermometer. (v) Give an example of another thermometric property. Heat: Theory Questions 2014 Question 7 (b) [Ordinary Level] The photograph shows an experiment to compare the heat transfer in different metals. A piece of wood is placed in a drop of wax at the end of each piece of metal and a heat source is used to heat the metals at the centre of the apparatus. (i) How is heat transferred in metals? (ii) Name the two other methods of heat transfer. (iii)how can this experiment be used to find out which of the metals is best at allowing heat transfer? (iv) State one way to make sure that this is a fair test Question 9 (a) [Ordinary Level] (i) The temperature of an object is a measure of its hotness or coldness. What is the SI unit of temperature? (ii) The Celsius scale is the practical temperature scale. How is the degree Celsius ( C) related to the SI unit of temperature? (iii)when heat is transferred to a substance, it causes a rise in temperature or a change in state of the substance, or both. 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 Question 8 (a) [Ordinary Level] (ii) Explain how heat is transferred in a solid. (iii)describe an experiment to compare the rates of heat transfer through different solids. (iv) Explain the term U-value (v) How can the U-value of the walls of a house be reduced? 2
![2010 Question 8 (b) [Ordinary Level] The diagram shows a solar heating system. (i) How is the sun s energy transferred to the solar collector? (ii) Why is the solar collector normally painted black?](/docs-images/89/98869158/images/3-0.jpg "(iii)how is the heat transferred from the solar panel to the hot water tank? (iv) The heating coil for the hot water tank are placed at the bottom, explain why.")
![(ii) Name three ways in which heat can be transferred. (iii)define specific heat capacity. 2006 Question 7 (a) [Ordinary Level] (i) Heat can be transferred in a room by convection.](/docs-images/89/98869158/images/3-2.jpg "(ii) What is convection? (iii)name two other ways of transferring heat. (iv) Describe an experiment to demonstrate convection in a liquid.")
3 2010 Question 8 (b) [Ordinary Level] The diagram shows a solar heating system. (i) How is the sun s energy transferred to the solar collector? (ii) Why is the solar collector normally painted black? (iii)how is the heat transferred from the solar panel to the hot water tank? (iv) The heating coil for the hot water tank are placed at the bottom, explain why. (v) Give an advantage and a disadvantage of a solar heating system Question 7 (c) [Ordinary Level] The rise in temperature of an object depends on the amount of heat transferred to it and on its specific heat capacity. (ii) Name three ways in which heat can be transferred. (iii)define specific heat capacity Question 7 (a) [Ordinary Level] (i) Heat can be transferred in a room by convection. (ii) What is convection? (iii)name two other ways of transferring heat. (iv) Describe an experiment to demonstrate convection in a liquid. (v) In an electric storage heater, bricks with a high specific heat capacity are heated overnight by passing an electric current through a heating coil in the bricks. The bricks are surrounded by insulation. Why is insulation used to surround the bricks? (vi) Name a material that could be used as insulation. (vii) Explain how the storage heater heats the air in a room Question 7 [Ordinary Level] (i) Heat can be transferred by conduction. What is meant by conduction? (ii) Name two other ways of transferring heat. (iii)describe an experiment to show how different solids conduct heat at different rates. (iv) The U-value of a house is a measure of the rate of heat loss to the surroundings. Give two ways in which the U-value of a house can be reduced. (v) The diagram shows a solar panel (solar heater) which can be used in the heating of a house. What energy conversion takes place in a solar panel? (vi) Why are the pipes in the solar panel usually made from copper? (vii) Why are the pipes in the solar panel usually painted black? (viii) Why does warm water rise to the top of the solar panel? 3
![Heat: Maths Questions 2013 Question 9 (b) [Ordinary Level] A kettle contains 1.3 kg of water with a specific heat capacity of 4200 J kg 1 K 1.](/docs-images/89/98869158/images/4-0.jpg "The temperature of the water rises from 10 C to 80 C during a three-minute period. (i) Calculate the energy gained by the water.")
![(ii) Calculate the power rating of the kettle, assuming all of the electrical energy is used to heat the water. 2015 Question 9 [Ordinary Level] (i) Distinguish between heat and temperature.](/docs-images/89/98869158/images/4-1.jpg "The diagram shows a kettle which is filled with 500 g of water which is initially at a temperature of 20 C. The heating element of the kettle has a power rating of 0.8 kw.")
4 Heat: Maths Questions 2013 Question 9 (b) [Ordinary Level] A kettle contains 1.3 kg of water with a specific heat capacity of 4200 J kg 1 K 1. The temperature of the water rises from 10 C to 80 C during a three-minute period. (i) Calculate the energy gained by the water. (ii) Calculate the power rating of the kettle, assuming all of the electrical energy is used to heat the water Question 9 [Ordinary Level] (i) Distinguish between heat and temperature. The diagram shows a kettle which is filled with 500 g of water which is initially at a temperature of 20 C. The heating element of the kettle has a power rating of 0.8 kw. We assume all the heat is transferred to the water. (ii) Find the energy required to raise the temperature of the water to 100 C. (iii)what is the energy supplied by the element per second? (iv) How long will it take the kettle to heat the water to 100 C? (v) Why are handles of kettles often made of plastic? (vi) How is the heat transferred throughout the liquid in the kettle? (vii) Why is the heating element of a kettle made of metal? (viii) The heat source for a kettle is placed at the bottom. Suggest why this is the case. (specific heat capacity of water = 4180 J kg 1 K 1 ) 2012 Question 9 (b) [Ordinary Level] 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, (i) Calculate the energy required to melt the ice. (ii) Calculate the energy required to warm the melted ice to 5 C. (iii)why is it important to stir the mixture? (specific heat capacity of water = 4180 J kg 1 K 1 ; specific latent heat of fusion of ice = J kg 1 ) (b) [Ordinary Level] An electric kettle is filled with 500 g of water and is initially at a temperature of 15 0 C. The kettle has a power rating of 2 kw. (i) Calculate the energy required to raise the temperature of the water to C. (ii) How much energy is supplied by the kettle every second? (iii)how long will it take the kettle to heat the water to C? (iv) Name a suitable material for the handle of the kettle. Justify your answer. (specific heat capacity of water = 4180 J Kg 1 K 1 ) 2008 Question 7 (c) [Ordinary Level] 4
5 A saucepan containing 500 g of water at a temperature of 20 C is left on a 2 kw ring of an electric cooker until it reaches a temperature of 100 C. All the electrical energy supplied is used to heat the water. (i) Calculate the rise in temperature of the water; (ii) Calculate the energy required to heat the water to 100 C; (iii)calculate the amount of energy the ring supplies every second; (iv) Calculate the time it will take to heat the water to 100 C Question 7 (b) [Ordinary Level] The total mass of the bricks in a storage heater is 80 kg and their specific heat capacity is 1500 J kg 1 K 1. During a ten-hour period the temperature of the bricks rose from 15 o C to 300 o C. (i) Calculate the energy gained by the bricks; (ii) Calculate the power of the heating coil Question 12 (b) [Ordinary Level] (i) Define specific heat capacity. (ii) An electric kettle contains 1.5 kg of water. The specific heat capacity of water is 4180 J kg -1 K -1. Calculate the amount of energy required to raise the temperature of the water from 15 0 C to C. (iii)the kettle takes 4 minutes to heat the water from 15 0 C to C. Calculate the power of the kettle. (Assume all the energy supplied is used to heat the water). (iv) Why is the heating element of an electric kettle near the bottom? 5
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