1) the total energy of a system equals: a) its heat and temperature b) its work and temperature c) its heat and work d) its heat only 2) a heat engine: a) converts heat input to an equivalent amount of work b) uses positive work done on the system to transfer heat from a low-temperature reservoir to a high-temperature reservoir c) a heat engine uses positive work done on the system to transfer heat from a high-temperature reservoir to a low-temperature reservoir d) takes heat in, does work, and loses energy heat 3) A heat engine takes in 700 J of heat from a high-temperature reservoir and rejects 500 J of heat to a lower-temperature reservoir. How much work does the engine do in each cycle? a) 100 J b) -100 J c) 200 J d) -200 J 4) If an ideal gas is compressed isothermally, which of the following statements is true? a) Energy is transferred to the gas by heat. b) The temperature of the gas increases. c) No work is done on the gas. d) The internal energy of the gas remains constant. 5) When an ideal gas undergoes an adiabatic expansion, which of the following statements is true? a) No work is done by the gas. b) The temperature of the gas doesn’t change c) The internal energy of the gas doesn’t change. d) No energy is delivered to the gas by heat 6) A gas is heated by supplying it with 250 kJ of energy; at the same time, it is compressed so that 500 kJ of work is done on the gas. Calculate the change in the internal energy of the gas. a) 250 kJ b) -250 kJ c) 750 kJ d) -750 kJ 7) 100 J is added to a sample of ideal gas as heat. The gas then expands against a piston, doing 70 J of work. During this process, what will happen to the temperature of the gas? a) The temperature of the gas stays the same b) The temperature of the gas increases c) The temperature of the gas decreases d) NO IDEA!! 8) a bicycle tyre bursts suddenly. what is the type of this process? a) isothermal b) adiabatic c) isovolumetric d) how should I possibly even know? :) 9) A piston of gas initially has 5000 joules of internal energy. 1000 joules of energy are added to the gas in the piston as heat, and the internal energy increases to 6500 joules. How much work was done on or by the gas? a) -500 J b) 500 J c) 250 J d) - 578 J 10) Suppose 40.00 J of energy is transferred by heat to a system, while the system does 10.00 J of work. Later, heat transfers 25.00 J out of the system, while 4.00 J is done by work on the system. What is the net change in the system’s internal energy? a) 30 J b) -21 J c) 9 J d) 51 J 11) What is the change in the internal energy of a system when a total of 150 J is transferred by heat from the system and 159.00 J is done by work on the system? a) - 9 J b) 9 J c) 359 J d) 59 J 12) How much work is done by a gas under 20 Pa of pressure increasing in volume by 3.0 m3? a) - 0.15 J b) 6.7 J c) -23 J d) 60 J 13) When is pressure-volume work said to be done ON a system? a) When there is an increase in both volume and internal pressure. b) When there is a decrease in both volume and internal pressure. c) When there is an increase in volume and an increase in internal pressure. d) When the volume is constant and a decrease in internal pressure. 14) In which of these processes is no work done? a) Water is boiled in a pressure cooker b) A refrigerator is used to freeze water. c) An automobile engine operates for several minutes d) A tire is inflated with an air pump. 15) Gas is compressed adiabatically in a cylinder with a cross-sectional area of 0.5 m2 by a piston moving 0.1 m as it does 150 J of work. How much pressure does the gas exert at the end of the piston's travel? a) 7.5 N/m 2 b) 750 N/m 2 c) 1500 N/m 2 d) 3000 N/ m 2

thermodynamics

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