Basic Concepts & Zeroth Law of Thermodynamics MCQ SET -5

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Friends, under this Mechanical section, you will practice Chapter Wise MCQs of ThermodynamicsUnder this, we will practice multiple choice questions and answers of Basic Concepts & Zeroth Law of Thermodynamics.

01.Which of the following is correct statement for 'Energy (E)'?





Ans. (d) : • Energy E is the property of system and it is the point function. • Change in energy between two states of a system is same for different path followed. • For point function dE = 0 ∫

02. Internal energy of system containing perfect gas depends on





Ans. (b) : Internal energy of a system containing perfect gas (ideal gas) depends on temperature only. U = f(T) [For ideal gas only

03Which of the following statements is correct for "Energy"





Ans. (a) : Note:-Option (a) is given by RPSC.

04. The heat capacity of the substance is given by expression:





Ans. (c) : Heat Capacity–Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to a given mass of a material to produce a unit change in its temperature. Heat capacity is an extensive property. It is denoted by C C = m × c (J/k) Where m → mass of the system c → Specific heat

05.Which of the following is NOT an intensive thermodynamic property?





Ans. (c) : Intensive Properties–An intensive property is a property of matter that depends only on the type of matter is a sample and not depends on the amount of mass. Example–Pressure, temperature, density, viscosity specific enthalpy, specific entropy, specific volume etc. Extensive Properties– An extensive property is a property that depends on the amount of matter in a sample. Example– Volume, enthalpy, entropy, mass energy etc.

06. A piston cylinder arrangement has air at 600 kPa, 290 K and volume of 0.01 m3 . During a constant pressure process, if it gives 54 kJ of work, the final volume must be





Ans. (a) : Given, P1 = 600 kPa T1 = 290 K W = 54 kJ V1 = 0.01 m3 V2 = ? W = PdV = P(V2 – V1) 54 × 103 = 600 × 103 (V2 – 0.01) V2 = 0.1 m3

07.Work done in a free expansion process is





Ans. (c) : From first law of thermodynamics δQ = dU + δW, since, for free expansion (T1 = T2) δQ = 0 and dU = 0 So, δW = 0

08. For an ideal gas, enthalpy is represented by





Ans. (b) : H = U + PV PV = mRT for unity mass, m = 1 H = U + mRT H = U + RT

09.Which one of the following represents the energy in storage?





Ans. (d) : Internal energy—Internal energy of a system is the sum of potential energy and kinetic energy of that system.

10. Heat transfer takes place as per





Ans. (c) : Heat transfer takes place as per second law of thermodynamics.

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