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:
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
- c. Radiation
- d. Sublimation
225. A process in which heat energy is transferred by the flow of fluid.
- a. Convection
- b. Conduction
- c. Radiation
- 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
- c. Radiation
- 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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