# MCQs in Thermodynamics Part V

(Last Updated On: December 8, 2017)

This is the Multiples Choice Questions Part 5 of the Series in Thermodynamics as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field.

### Online Questions and Answers in Thermodynamics Series

Following is the list of multiple choice questions in this brand new series:

MCQs in Thermodynamics
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: PART VII
PART 8: MCQs from Number 351 – 400                 Answer key: PART VIII
PART 9: MCQs from Number 401 – 450                 Answer key: PART IX
PART 10: MCQs from Number 451 – 500                Answer key: PART X

### Continue Practice Exam Test Questions Part V of the Series

Choose the letter of the best answer in each questions.

201. Thermodynamics is the study of heat and its transformation which stems from Greek words meaning _________.

• a. transformation of heat
• b. transformation of energy
• c. movement of heat
• d. movement of matter

202. What is the Si unit for temperature?

• a. Kelvin
• b. Celsius
• c. Fahrenheit
• d. Rankine

203. The energy that flows from higher temperature object to a lower temperature object because of the difference in temperature is called

• a. heat
• b. temperature
• c. thermodynamics cycle
• d. energy flow

204. The amount of heat energy per kilogram that must be added or removed when a substance changes from one phase to another.

• a. specific heat
• b. heat of expansion
• c. latent heat
• d. useful heat

205. The change in physical size of a substance when its temperature changes.

• a. intensive property
• b. extensive property
• c. volume expansion
• d. thermal expansion

206. A stress which develops within an object when it attempts to expand or contract in response to a temperature changes, but cannot, due to being held rigidly in place.

• a. elongation
• b. thermal stress
• c. expansion contraction
• d. thermal expansion

207. The energy associated with individual molecules in a gas, liquid or solid.

• a. Specific Energy
• b. Molecular Energy
• c. Internal Energy
• d. Phase Energy

208. The heat Q per unit mass per degree change in temperature that must be supplied or removed to change the temperature of a substance.

• a. Specific Heat Capacity
• b. Latent Heat
• c. Heat of Transformation
• d. Internal Heat

209. The pressure of the vapor phase of a substance that is in equilibrium with the liquid or solid phase.

• a. Phase Pressure
• b. Equilibrium Vapor Pressure
• c. Specific Pressure
• d. Equilibrium Phase Pressure

210. Vapor pressure depends only on _________.

• a. pressure
• b. force
• c. volume
• d. temperature

211. A plot of pressure vs. temperature for a given substance showing the various phases possible for that particular substance.

• a. Phase diagram
• b. P-T diagram
• c. Wein Diagram
• d. Histogram

212. _________ is the grand total of all energies inside a substance.

• a. Internal Energy
• b. Grand Energy
• c. Atomic Energy
• d. Elemental Energy

213. The _________ is defined as the amount of heat required to change the temperature of 1 gram of water by 1 Celsius degree.

• a. specific heat
• b. latent heat
• c. Joule
• d. calorie

214. _________ is a measure of the average kinetic energy per molecule in a substance.

• a. movement
• b. temperature
• c. heat
• d. mass

215. _________ the very small KE still present in molecules at absolute zero temperature.

• a. internal KE
• b. Atomic kinetic energy
• c. Zero-Point Energy
• d. Subliminal Energy

216. Convert the change of temperature from 20˚C to 30˚C to Kelvin scale.

• a. 10 K
• b. 293 K
• c. 303 K
• d. 273 K

217. _________ is a thermodynamic potential which measures the “useful” work obtainable from a closed thermodynamic system at a constant temperature and volume.

• a. useful work
• b. energy consumed
• c. Helmholtz free energy
• d. Kinetic Energy

218. How much will the length of a 1.0 km section of concrete highway change if the temperature varies from -15˚C in winter to 41˚C in summer?

• a. 0.67 m
• b. 2.2 m
• c. 3.1 m
• d. 0.47 m

219. Two 12 ft. sections of aluminum siding are placed end to end on the outside wall of house. How large a gap should be left between the pieces to prevent buckling if the temperature can change by 55˚C?

• a. 0.21 m
• b. 0.18 m
• c. 0.31 in
• d. 0.18 in

220. What is the amount of radiant energy received each second over each square meter that is at right angles to the sun’s rays at the top of the atmosphere?

• a. 1400 J
• b. 6000 J
• c. 10000 J
• d. 800 J

221. _________ is a thermodynamic potential that measures the “useful” or process-initiating work obtainable from an isothermal, isobaric thermodynamic system.

• a. Du-Pont Potential
• b. Gibbs free energy
• c. Rabz-Eccles Energy
• d. Claussius Energy

222. All the energy we consume ultimately becomes _________.

• a. heat
• b. depleted
• c. exhausted
• d. work

223. _________is the partial pressure of water vapor at the existing temperature divided by the equilibrium vapor pressure of water at the existing temperature.

• a. vacuum pressure
• b. relative humidity
• c. absolute pressure
• d. vapor pressure

224. _________ is the transition of a given substance from the solid to the gas phase with no intermediate liquid stage.

• a. Convection
• b. Conduction
• d. Sublimation

225. A process in which heat energy is transferred by the flow of fluid.

• a. Convection
• b. Conduction
• d. Sublimation

226. In order to use a substance to make a thermometer the substance must _________ with a temperature change.

• a. expand
• b. contract
• c. change
• d. increase

227. For most solids, the coefficient of volume expansion is _________ the coefficient of linear expansion.

• a. unrelated to
• b. proportional to
• c. twice
• d. three times

228. The volume of a given amount of water _________ as the temperature decreases from 4˚C to 0˚C.

• a. decreases
• b. increases
• c. remains constant
• d. none of the above

229. The gas in a constant gas thermometer cooled to absolute zero would have _________.

• a. no volume
• b. no pressure
• c. zero temperature at all scales
• d. none of the above

230. On a day when the partial pressure of water vapor remains constant, what happens as the temperature rises?

• a. the relative humidity increases
• b. the relative humidity decreases
• c. the relative humidity remains constant
• d. the air would eventually become saturated

231. The flow of a fluid when heat is transferred by convection.

• a. placidity
• b. mass flow
• c. convection current
• d. heat transfer

232. An idealized perfect absorber and perfect emitter of radiation.

• a. elastic material
• b. transponder material
• c. Teflon
• d. blackbody

233. A process by which heat is transferred through a material without a bulk movement of the material.

• a. Convection
• b. Conduction
• d. Emission

234. Is the amount of a substance that contains Avogadro’s number of atoms/molecules.

• a. mass
• b. matter
• c. gram-mole
• d. volume

235. The distribution of particle speeds in an ideal gas at a given temperature.

• a. velocity of propagation
• b. escape velocity
• c. Maxwell speed Distribution
• d. terminal velocity

236. A convection process in which an external device, such as a fan, is used to produce the fluid flow.

• a. Forced Convection
• b. External Convection
• c. Placid Convection
• d. Thermionic Convection

237. A _________ is a quantity whose value at any state is independent of the path or process used to reach that state.

• a. cycle
• b. path function
• c. point function
• d. process

238. A _________ is a quantity whose value depends on the path followed during a particular change in state.

• a. path function
• b. point function
• c. process
• d. cycle

239. The contact surface shared by both the system and the surroundings is called _________.

• a. wall
• b. boundary
• c. interface
• d. intersection

240. A closed system is also known as _________.

• a. isolated system
• b. closed container
• c. control mass
• d. control volume

241. Open system is also known as _________.

• a. isolated system
• b. closed container
• c. control mass
• d. control volume

242. Liquid hydrogen boils at 17 K. What is the temperature in degrees Celsius?

• a. 290
• b. 63
• c. -120
• d. -256

243. When a solid melts,

• a. the temperature of the substance increases.
• b. the temperature of the substance decreases.
• c. heat leaves the substance.
• d. heat enters the substance.

244. How many kilocalories of heat are required to heat 750 g of water from 35˚C to 55˚C.

• a. 15
• b. 1500
• c. 1.5 x 10^4
• d. 6.3 x 10^4

245. Which of the following does not determine the amount of internal energy an object has?

• a. temperature
• b. amount of material
• c. type of material
• d. shape of the object

246. Which of the following have the highest thermal conductivities?

• a. liquids
• b. gases
• c. metals
• d. solids other than metals

247. Identical objects of four different materials are heated to the same high temperature. Which of the following would least likely burn your hand if touched?

• a. aluminium
• b. brass
• c. glass
• d. concrete

248. As we heat a gas at constant pressure, its volume

• a. increases
• b. decreases
• c. stays the same
• d. none of the above

249. The volume of an ideal gas is directly proportional to its

• a. pressure
• b. Celsius temperature
• c. Kelvin temperature
• d. Fahrenheit temperature

250. An ideal gas is maintained at constant temperature. If the pressure on the gas is doubled, the volume is

• a. increased fourfold
• b. doubled
• c. reduced by half
• d. decreased by a quarter

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