1) What does Brownian motion show? a) Evidence for the random movement of molecules b) Evidence that molecules have kinetic energy c) Evidence that large particles get moved around by small molecules d) Evidence that your bowels are working 2) Gas pressure is increased because.... a) The kinetic energy of the molecules is increased b) There is a larger rate of change of momentum of the molecules c) Time between collisions with the container side is increased d) of the force 3) The potential energy in a substance is decreased when... a) it increases in temperature b) it changes from a liquid to a gas c) it changes from a liquid to a solid d) it decreases in temperature e) you eat it 4) internal energy is increased when... a) the substance changes state or increases in temperature b) the substance changes state c) the substance increases in temperature d) external energy decreases 5) What phase does this show? a) solid b) liquid c) gas d) it doesn't show a phase 6) Thermal equilibrium is achieved by... a) thermal energy travelling from high to low temperature b) thermal energy travelling from low to high temperature c) either of the above d) it can never be achieved 7) What is average internal body tmeperature in degrees kelvin? a) -236.15 b) 310.15 c) 300.15 d) -226.15 e) ten 8) What is absolute zero? a) The lowest temperature that can currently be measured b) when the molecules have minimum internal energy c) when the molecules have minimum kinetic energy d) The king of zeros 9) The immersion heater is 60W. The beaker contains a kilogram of water at 294 K. After 5 minutes, the temperature went up to 298 K. What is the specific heat capacity? a) 4500 b) 4200 c) 4100 d) 4300 e) 4400 f) banana 10) 500 g of water is heated with 1.9 kJ. The water starts at 10 Celcius what is it's new temperature if it has an SHC of 4200 J/kg/K? a) 75 b) 90 c) 80 d) 100 e) 95 f) 85 11) What does the specific latent heat of fusion mean? a) Amount of energy needed to change a substance from liquid to gas b) Amount of energy needed to changea substance from solid to liquid c) Amount of energy needed to change 1kg of a substance from solid to liquid d) Amount of energy needed to change 1kg of a substance from liquid to solid e) A measured amount of dormant uncool bonded stickiness 12) 0.05 kg of ice at 273.15 K is plunged into 0.4 kg of water at 293.15 K. If the energy from the water goes to completely melt the ice, what temperature does the water end up? (SHC water 4200 J/kg/K SLHF ice 330 kJ/kg) a) 280.15 K b) 283.15 K c) 281.15 K d) 282.15 K 13) What does this graph show? a) Boyles law b) Charles law c) Gas pressure law d) Ideal gas law e) The Law 14) What does n stand for in this equation? a) number of molecules b) number of moles c) boltzmann constant d) avagadros constant e) nothing 15) The mean translational kinetic energy of an atom of an ideal gas is directly proportional to the temperature of the gas inkelvin a) True b) False 16) Calculate the average velocity of some hydrogen gas atoms, if the H is at a temperature of 300 K and the H atoms have a mass of a proton. a) 2956 m/s b) 2512 m/s c) 2052 m/s d) 2671 m/s e) 2725 m/s f) 2

thermal physics end of module quiz

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