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Physics Grade 11 Unit 5: HEAT CONDUCTION AND CALORIMETRY

42 national exam questions have come from this unit. It runs 42 pages; one careful study pass takes about 6.1 hours, and its difficulty is harder among Physics units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

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5.1 The Concept of Heat · read p. 176

2013 E.C., Q11 – The second law of thermodynamics states that
2013 E.C., Q40 – If 25 J is taken away by heat from a system, and the system does 20 J of work, what is the change in internal energy of the system?
2012 E.C., Q6 – Which of the following is correct?
2011 E.C., Q24 – External force of 220N applied on a piston of a cylinder containing 1.25g of ammonia gas move 10cm as shown in the diagram below. Assuming adiabatic process, what is the rise in temperature of the gas? (Specific heat K ∘
2011 E.C., Q23 – The direction of heat flow is from:
2011 E.C., Q26 – Which of the following statement is NOT correct?
2010 E.C., Q21 – Which of the following statement is not correct?
2010 E.C., Q20 – If a thermodynamic system undergoes a process in which its internal energy increased by 400 J while doing 200 J of work on its surrounding, then what is the energy absorbed in or extracted from it in the form of heat?
2010 E.C., Q22 – A heat engine operating between 100°C and 700°C has efficiency equal to 40 % of the maximum theoretical efficiency. How much energy does this engine extract from the hot reservoir in order to do 5000 J of mechanical work
2009 E.C., Q26 – Three metals are in contact and in thermal equilibrium. The metals have different specific heat capacity. What can be concluded about the temperature of the metals?
2009 E.C., Q24 – Which of the following statements is correct?
2006 E.C., Q14 – A cup of coffee at a temperature of 80°C is placed on table in a 20°C room. What happens to the thermal energy and molecular motion of the coffee when it is left on the table?
2005 E.C., Q18 – An ordinary refrigerator is turned on and its door is open in a thermally insulated kitchen. What is the temperature of the room?

5.2 Heat transfer mechanisms · read p. 179

Not asked in a national paper yet.

5.3 Heat Capacity and Specific Heat Capacity · read p. 183

2018 E.C., Q37 – What amount of heat energy is required to raise the temperature of 0.15 kg of silver from 20°C to 100°C? (Specific heat capacity of silver is 233.0 J/kg.°C)
2017 E.C., Q49 – The amount of heat energy required to raise the temperature of a given substance by is
2008 E.C., Q19 – The number of joules of heat energy required to raise the temperature of a body by 1k is
2007 E.C., Q23 – The amount of heat required to raise the temperature of an object of mass m = 1Kg by 1 Kelvin is known as___________

5.4 Thermal expansion · read p. 186

2018 E.C., Q54 – A 25.0 liter container made of copper is completely filled with glycerin at a temperature of $20^\circ\text{C}$. The coefficient of linear expansion of copper is $\alpha = 1.7 \times 10^{-5}\,{}^\circ\text{C}^{-1}$ and t
2017 E.C., Q51 – A square metal plate of coefficient of linear expansion $\alpha$, has a surface area $A_0$ at a temperature $T_0$. If the temperature is raised by an amount $\Delta T$, then the plate surface area is changed to $A$ which
2016 E.C., Q14 – Which one of the following correctly describes the relationship between the factors affecting laminar flow?
2016 E.C., Q42 – A man looks down at a coin that lies at the bottom of a glass container of liquid of depth d = 12 cm and index of refraction, n. Because of the view of eye, the coin appears to be located at a depth of 9 cm below the sur
2016 E.C., Q28 – A square shaped body of side length l 0 is heated to raise its temperature by ΔT in Kelvin. If α stands for coefficient of linear expansion and β being coefficient of area expansion, which one of the following expression
2015 E.C., Q30 – A bimetallic strip made up of iron and brass bonded together is used in a thermostat. The coefficient of linear expansions for iron and brass are 1.1 × 10⁻⁵/K and 1.9 × 10⁻⁵/K, respectively. Which of one the following ph
2014 E.C., Q30 – Which one of the following statements describes the unusual behavior of expansion of water?
2013 E.C., Q39 – Most solids expand upon heating, which one of the following statements correctly describe the phenomena?
2009 E.C., Q27 – Metal A has a coefficient of linear expansion that is three times the coefficient of linear expansion of metal B. How does their coefficient of areal expansion, Y, compare?
2008 E.C., Q23 – A metal ball has a diameter that is slightly greater than the diameter of a hole that has been cut in to a metal plate. The coefficient of linear expansion for the metal from which the ball is made is greater than that f
2006 E.C., Q44 – A glass flask whose volume is exactly $1{,}000\,\text{cm}^3$ at $0^\circ\text{C}$ is totally filled with $1000\,\text{cm}^3$ of mercury at this temperature. When flask and mercury are heated to $100^\circ\text{C}$, $15.2
2005 E.C., Q19 – The length of an aluminium rod at a temperature of 20 c is 3m. What will be the ratio of change in the length of ∘ the rod to its original length if its temperature is raised to 120 c? the coefficient of linear expansion

5.5 Change of phase · read p. 196

2018 E.C., Q53 – Which one of the following statements is correct about critical and boiling points?
2017 E.C., Q44 – Which one of the following phenomena occurs during change of phases of a matter? During a phase change from
2017 E.C., Q54 – How much heat energy is required to change 5 kg of ice at to water at ? (Specific heat capacities ∘ ∘ of water in liquid and solid phases are 4.2 kJ/kg C and 2.1 kJ/kg C, respectively, and latent heat of fusion of = f 33
2016 E.C., Q11 – The amount of heat energy required to change 1 kg of the substance from solid to liquid at its melting point is
2015 E.C., Q22 – The amount of heat energy required to change a substance from a liquid to a gaseous state is known as
2015 E.C., Q13 – Which one of the following statements is correct about critical and boiling points of a substance?
2013 E.C., Q38 – The particular temperature and pressure at which the solid, liquid, and gaseous phases of a given substance are all at equilibrium with another is known as:

5.6 Calorimetry · read p. 203

2018 E.C., Q51 – Which one of the following quantities is required to determine the specific heat capacity of a substance?
2015 E.C., Q12 – Which one of the following activities of experiment is NOT necessary to determine the specific latent heat of vaporization of water?
2015 E.C., Q17 – An ideal monoatomic gas expands adiabatically from an initial volume of 2 liters at a temperature of 300 K to 16 liters of volume. What is the final temperature of the gas? (Use the ratio of specific heat capacity at con
2011 E.C., Q22 – How much heat would be absorbed by 2g of ice at 0 c dropped into water at 0 c, to melt it totally to water at 0 c? (Latent heat of melting, L = 340,000J/Kg )
2010 E.C., Q19 – An electric immersion water heater is rated at 400w. how long will it take to heat one kilogram of water from 10 to 30 ? (the specific heat of water is 4.2 J/g k.)
2006 E.C., Q45 – A heat engine is being designed to have a Carnot efficiency of 65.0% when operating between two energy 20.0 C ∘ reservoirs. If the temperature of the cold reservoir is , what must be the temperature of the hot reservoir?