# MCQs in Thermodynamics Part VI

(Last Updated On: December 8, 2017) This is the Multiples Choice Questions Part 6 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 VI of the Series

Choose the letter of the best answer in each questions.

251. If the Kelvin temperature of an ideal gas is doubled, what happens to the rms speed of the molecules in the gas?

• a. it increases by a factor of square root of 2
• b. it increases by a factor of 2
• c. it increases by factor of 4
• d. none of the above

252. A function of state that is associated with disorder in the system and environment.

• a. enthalpy
• b. entropy
• c. law of diminishing return
• d. Lenz’ Law

253. No volume changes occur during this type of process

• a. Isobaric process
• b. Isomillimetric process
• c. Isocaloric process
• d. Isochoric process

254. The boiling of water into steam in an open container is an example of a/an _________ process.

• b. isochoric
• c. isobaric
• d. zero work

255. When liquid water is converted to steam at 100˚C, the entropy of water

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

256. Only energy can cross the boundaries.

• a. Closed system
• b. Open system
• c. Isolated system
• d. Isoenergetic system

257. The temperature at which the vapor pressure exactly equals one atm is called _________.

• a. boiling temperature
• b. normal boiling point
• c. triple point
• d. point of infliction

258. Mixture of liquid and steam of the same substance in which both are at saturation temperature.

• a. dry steam
• b. current steam
• c. wet steam
• d. aerosol

259. The term _________ is traditionally used to describe steam issuing from condensate receiver vents and open-ended condensate discharge lines from steam traps.

• a. dry steam
• b. wet steam
• c. phase steam
• d. flash steam

260. Defined as the ratio of weight of dry steam to the weight of stuff.

• a. dryness fraction
• b. Vaporization
• c. fusion
• d. super heated steam

261. What device measures infrared radiation below?

• a. thermocouple
• b. thermopile
• c. thermodynamic device
• d. thermos

262. When an object undergoes thermal expansion,

• a. any holes in the object expand as well
• b. any holes in the object remain the same
• c. mass increases
• d. molecular activities would cease

263. _________ is the quantity of heat required to raise the temperature of one pound of water 1 F˚ from 63 ˚F to 64 ˚F.

• a. one Joule
• b. one calorie
• c. one watt
• d. one BTU

264. Boiling temperature of a material is dependent on its _________.

• a. volume
• b. power
• c. heat
• d. pressure

265. Thermos was invented by _________.

• a. Sir Arthur Conan Doyle
• b. Sir Fredrich the Great
• c. Thomas Edison
• d. Sir James Dewar

266. Most cooking activities involve _________ process.

• a. Isochoric
• b. Isothermal
• c. Isobaric
• d. Isovolumic

267. Adiabatic heating and Adiabatic cooling really means _________ and _________ respectively.

• a. raising the temp and lowering the temp
• b. maintaining the pressure and changing the temperature
• c. decreasing the volume and increasing the pressure
• d. lowering the temp and raising the temp

268. The statement “heat cannot by itself flow from one body into a hotter body” is governed by _________.

• a. the first law of thermodynamics
• b. the second law of thermodynamics
• c. the third law of thermodynamics
• d. the zeroth law of thermodynamics

269. It is impossible for any process to have as its sole result the transfer of heat from a cooler to a hotter body

• a. Carnot’s statement
• b. Clausius statement
• c. Rankine statement
• d. Gauss statement

270. _________ is the average distance a molecule moves before colliding with another molecule.

• a. mean free path
• b. path allowance
• c. compacting factor
• d. molecular space

271. Find the pressure due to a column of mercury 74.0 cm high.

• a. 91.80 x 10^3 N/m^2
• b. 73.56 x 10^2 N/m^2
• c. 9.86 x 10^4 N/m^2
• d. 87.2 x 10^4 N/m^2

272. Roughly what is the total weight of air in the entire earth?

• a. 1 x 10^5 tons
• b. 2 x 10^6 tons
• c. 6 x 10^15 tons
• d. 8 x 10^10 tons

273. _________ is defined as that equivalent to the pressure due to a column of mercury 76cm long.

• a. surface pressure
• b. gage pressure
• c. standard atmospheric pressure
• d. isobaric pressure

274. If any external pressure is applied to a confined fluid, the pressure will be increased at every point in the fluid by the amount of the external pressure is known as _________.

• a. Torricelli’s law
• b. Barometric law
• c. Newton’s Second law
• d. Pascal’s law

275. What type of pressure cannot be used for Boyle’s Law?

• a. Atmospheric Pressure
• b. Gauge Pressure
• c. Surface Pressure
• d. Isobaric Pressure

276. To displace a cubic foot of fresh water, you need _________ force.

• a. 62.4 lb
• b. 9.81 lb
• c. 76 lb
• d. 760 lb

277. The force per unit length across such a line in the surface is called _________.

• a. force per length
• b. surface tension
• c. Pressure
• d. Density

278. The speed at which a liquid escapes from a vessel through an orifice is given by _________.

• a. Archimedes Principle
• b. Evangelista’s Law
• c. Torricelli’s Theorem
• d. Bernoulli’s Equation

279. The process of one substance mixing with another because of molecular motion is called _________.

• a. diffusion
• b. viscosity
• c. streamline flow
• d. solution

280. When was the Ninth General Conference on Weights and Measures decided to abandon centigrade and used Celsius Instead?

• a. 1950
• b. 1936
• c. 1957
• d. 1948

281. _________ is the temperature to which the air must be cooled, at constant pressure, to produce saturation.

• a. relative humidity
• b. triple point temperature
• c. dew point
• d. critical point

282. _________ is a succession of changes that ends with the return of the body or system to its initial state.

• a. process
• b. system
• c. equilibrium
• d. cycle

283. Intensive properties of a system are called _________.

• a. Bulk Properties
• b. Innate Properties
• c. Natural Properties
• d. Inside Properties

284. In thermodynamics, a throttling process, also called a _________, is a type of isenthalpic process where a liquid or gas is cooled as it passes from a higher pressure state to a lower pressure state.

• a. Rankine Process
• b. Carnot Cycle
• c. Joule-Thomson process
• d. Refrigeration process

285. Gasoline and Diesel Engines are best described by the _________.

• a. Otto Cycle
• b. Burnign Cycle
• c. Shikki Cycle
• d. Shapa R’ Elli Cycle

286. Twenty grams of ice at 0˚C melts to water at 0˚C. How much does the entropy of the 20g change in this process?

• a. 30.5 J/K
• b. 24.6 J/K
• c. 21.3 J/K
• d. 15.7 J/K

287. The first law of thermodynamics is based on which of the following principles?

• a. conservation of mass
• b. the enthalpy-entropy relationship
• c. action – reaction
• d. conservation of energy

288. If a system absorbs 500 cal of heat at the same time does 400J of work, find the change in internal energy of the system.

• a. 1400 J
• b. 1700 J
• c. 1900 J
• d. 1500 J

289. A gas is enclosed in a cylinder with a weighted piston as the top boundary. The gas is heated and expands from a volume of 0.04 m3 to 0.10 m3 at a constant pressure of 200 kPa. Find the work done on the system.

• a. 5 kJ
• b. 15 kJ
• c. 10 kJ
• d. 12 kJ

290. A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency?

• a. 11.28 %
• b. 36.77 %
• c. 20.36 %
• d. 17.66 %

291. Heat which causes a change in temperature of a substance.

• a. Latent heat
• b. Sensible heat
• c. Specific heat
• d. Heat of Fusion

292. Who coined the term latent heat?

• a. John Thompson
• b. Studey Baker
• c. Joe di Maggio
• d. Joseph Black

293. Which of the following cannot be measured by a thermometer?

• a. Latent Heat
• b. Sensible Heat
• c. Specific Heat
• d. Heat of Fusion

294. It is generally accepted as a law of nature that although one may closely approach 0 Kelvin it is impossible actually to reach it.

• a. First Law of thermodynamics
• b. Second Law of thermodynamics
• c. Third Law of thermodynamics
• d. Zeroth Law of thermodynamics

295. One calorie is equal to _________.

• a. 1/180 W.h
• b. 1/860 W.h
• c. 1/360 W.h
• d. 1/250 W.h

296. A _________ is a reversible process in which there is transfer of heat and takes place according to the relation pVn = C where n is any constant.

• a. Polytropic process
• b. Entropy
• c. Ideal Gas Law
• d. Carnot Cycle

297. The flow through an open system is _________ if all properties at each point within the system remain constant with respect to time.

• a. streamline flow
• c. constant flow
• d. algebraic flow

298. The most efficient cycle that can operate between two constant temperature reservoir is the _________.

• a. Otto Cycle
• b. Lazare Cycle
• c. Isothermal Cycle
• d. Carnot Cycle

299. The flow energy of 150 L of a fluid passing a boundary to a system is 110 kJ. Determine the pressure at this point

• a. 733.33 kPa
• b. 833.33 kPa
• c. 933.33 kPa
• d. 633.33 kPa

300. Who is the father of thermodynamics?

• a. Lazare Carnot
• c. William Thompson
• d. Rudolf Classius

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