# MCQs in Thermodynamics Part IX

(Last Updated On: December 8, 2017) This is the Multiples Choice Questions Part 9 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 IX of the Series

Choose the letter of the best answer in each questions.

401. An engineering science primarily concerned with heat and work conversions.

• a. Thermodynamics
• b. Mechanics
• c. Physics
• d. Electromagnetic

402. “If the temperature o f a fixed quantity of a gas is held constant during a change of state, the volume varies inversely with the absolute pressure.

• a. Charle’s Law
• b. Boyle’s Law
• c. Dalton’s Law
• d. Amagat’s Law

• a. 6.2205 x 10^23 mol-1
• b. 6.2025 x 10^23 mol-1
• c. 6.0225 x 10^23 mol-1
• d. 6.2250 x 10^23 mol-1

404. The first law of thermodynamics may be expressed in the following equivalent

• a. the net heat transfer id equal to the network
• b. the sum of the total energy forms leaving the system boundary is always equal to the energy input
• c. energy can neither be created nor destroyed but only converted from one form to another
• d. all of the above

405. A system whose boundary does not allow the exchange of either matter or energy with the surrounding

• a. open system
• b. closed system
• c. isolated system
• d. none of the above

406. The specific terms used in phase transitions

• a. melting
• b. evaporation
• c. freezing
• d. sublimation

407. The density of water at 4°C is

• a. 1 gm/cm³
• b. 2 gm/cm³
• c. 3 gm/cm³
• d. 4 gm/cm³

408. Archimedes principle states that

• a. when a body is inversed in a fluid, the fluid exerts a downward force on the body whose magnitude is equal to the weight of the displaced fluid
• b. when a body is inversed in a fluid, the fluid exerts a upward force on the body whose magnitude is equal to the weight of the displaced fluid.
• c. when a body is inversed in a fluid, the fluid exerts a downward force on the body whose magnitude is greater than the weight of the displaced fluid.
• d. when a body is inversed in a fluid, the fluid exerts a downward force on the body whose magnitude is lower than the weight of the displaced fluid.

409. Types of system except one

• a. closed
• b. open
• c. isolated
• d. solid

410. Isometric process is

• a. T = P
• b. P = C
• c. V = C
• d. T = V

411. The ratio of the change in energy in the form of the heat

• a. relative density
• b. specific heat
• c. specific gravity
• d. none of the above

412. Specific heat ratio is always

• a. > 1
• b. < 1
• c. = 1
• d. none of the above

413. It states that mass is a commodity that can neither be heated nor destroyed with the exception of nuclear processes where the conversion of mass into energy is a fundamental principle

• a. Law of Conservation of Mass
• b. Law of Conservation of Energy
• c. Law of Conservation of Power
• d. Law of Conservation of Heat

414. The energy that stored in a system as a result of its position in the earth’s gravitational field

• a. elastic energy
• b. kinetic energy
• c. potential energy
• d. flow energy

415. It involves a force deforming a solid body

• a. non-elastic work
• b. non-flow work
• c. flow work
• d. elastic work

416. Developed the Fahrenheit scale

• a. Gabriel Daniel Fahrenheit
• b. Daniel Gabriel Fahrenheit
• c. Gabriel Danelle Fahrenheit
• d. Danelle Gabriel Fahrenheit

417. Developed the centigrade or Celsius

• a. Andres Celsius
• b. Anders Celsius
• c. Andrew Celsius
• d. Anthony Celsius

418. Instrument used to measure the absolute pressure of the atmosphere

• a. galvanometer
• b. thermometer
• c. barometer
• d. pressure gages

419. A vector quantity whose direction is the same as the direction of the velocity

• a. Force
• b. Momentum
• c. Friction
• d. Resultant

420. Conceptualize that the heat was an energy form and that there was a precise relationship between heat and work.

• a. Count Rumford
• b. Sir Humpry Davey
• c. James Prescott
• d. all of the above

421. Which is true:

• a. Energy is a scalar quantity
• b. Energy is a vector quantity
• c. Energy is vector & scalar
• d. None of the above

422. It is a region enclosed by specified boundaries, which may be imaginary, either fixed or moving

• a. Isolated system
• b. Open system
• c. System
• d. None of the above

423. Amount or volume of liquid that pass in a given limit of time

• a. Flow rate
• b. Volume
• c. Time
• d. None of the above

424. Ability to do work

• a. Power
• b. Energy
• c. Work
• d. None of the above

425. Amount of heat needed to rate the temperature of a substance by 1°C

• a. Heat Exchange
• b. Heat Engine
• c. Specific Heat
• d. None of the above

426. Study of transformation of heat energy to mechanical energy to other forms of energy.

• a. Thermodynamics
• b. Physics
• c. Mechanics
• d. None of the above

427.Heat cannot be created, nor destroyed, but it can be changed from one form to another. The energy in the universe remains constant.

• a. 1st Law of Energy Conservation
• b. 2nd Law of Energy Conservation
• c. 3rd Law of Energy Conservation
• d. None of the above

428. Quantities that describe both magnitude & direction

• a. Physical Quantity
• b. Scalar Quantity
• c. Vector Quantity
• d. None of the above

429. The sum of energies of all the molecules in a system, energies that appear in several complex forms.

• a. External Energy
• b. Internal Energy
• c. Kinetic Energy
• d. None of the above

430. The value of atomic charge e is

• a. 1.60210 x 10-19 coulomb
• b. 1.68910 x 10-19 coulomb
• c. 1.20160 x 1019 coulomb
• d. None of the above

431. p1V1= p2V2

• a. Charle’s Law
• b. Boyle’s Law
• c. Ideal Gas Law
• d. Joule’s Law

432. A _______ is used to measure atmospheric pressure.

• a. Thermometer
• b. Barometer
• c. Manometer
• d. None of the above

433. Work done in pushing a fluid across a boundary, Usually into or out of a system

• a. Flow Work
• b. Flow Energy
• c. Both a & b
• d. None of the above

434. Which is not true about Heat (Q):

• a. Q is positive when heat is added to the body or system
• b. Q is negative when heat is rejected by the body or system
• c. Q is positive when heat is rejected by the body or system
• d. None of the above

435. The standard reference atmospheric pressure

• a. 760 mmHg
• b. 1 atm
• c. 14.696 psia
• d. All of the above

436. ______ is that property of a substance which remains constant if no heat enters or leaves the substance, while it does work or alters its volume, but which increases or diminishes should a small amount of heat enter or leave.

• a. Entrophy
• b. Enthalpy
• c. Specific Heat
• d. None of the above

437.The acceleration of a particular body is directly proportional to the resultant force acting on it & inversely proportional to its mass.

• a. Pascal’s Law
• b. Joule’s Law
• c. Newton’s Law
• d. None of the above

438. Mass (not weight) per unit volume

• a. Specific Weight
• b. Specific Volume
• c. Density
• d. None of the above

439. Composite property applicable to all fluids

• a. Entropy
• b. Enthalpy
• c. Specific Heat
• d. None of the above

440. A classification of system in which mass does not cross its boundaries.

• a. Nonflow System
• b. Open System
• c. Closed System
• d. None of the above

441. Gas being heated at constant volume is undergoing the process of.

• a. isometric
• b. specific heat
• c. enthalpy
• d. isothermal

442. The heat per unit mass per degree change in temperature

• a. specific heat
• b. isometric
• c. conservation of energy
• d. none of the above

443. A unit of pressure used in high vacuum technology, which is equal to 1mmhg.

• a. specific heat
• b. isometric
• c. isobaric
• d. torr

444. The gas constant is equal to

• a. Cp – Cv
• b. Cp + Cv
• c. Cp – Cv + k
• d. None of the above

445. The 1st Law of Thermodynamics on what principle?

• a. Conservation of Energy
• b. Conservation of mass
• c. Enthalpy
• d. Isometric

446. A system having a rigid boundary that energy, work and mass does not cross its boundaries

• a. Specific Heat
• b. Specific Gravity
• c. Isolated System
• d. Enthalpy

447. Sum of the internal energy of a substance and the product of pressure and volume.

• a. Specific Heat
• b. Specific Gravity
• c. Isolated System
• d. Enthalpy

448. The ratio of the weight of a substance to the weight of some standard substance is called?

• a. Specific Heat
• b. Specific Gravity
• c. Isothermal
• d. Specific Weight

449. Specific heat capacity in SI unit.

• a. kJ / kg.k
• b. kJ / kg
• c. kN / kg
• d. None of the above

450. The Law of Thermodynamics that provides the basis for measuring the thermodynamic property of temperature.

• a. Charle’s Law
• b. Boyle’s Law
• c. Zeroth Law
• d. Gas Law

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