Question

i) Represent the following processes on the p-V diagrams: i) isobaric, ii) isochoric,

iii) isothermal, iv) cyclic. (2)

ii) Write principal merits of a Pt-resistance thermometer. (2)

iii) A gaseous system expands from volume V1 to V2 under isobaric conditions.

Calculate the work done in this process. (2)

iv) Write Mayer’s formula. The molar heat capacities of a gas at constant pressure

and constant volume are 28.8 J mol−1

K−1

and 20.5 J mol−1

K−1

respectively.

Calculate the gas constant. (2)

v) Using the Laplace formula, calculate the velocity of sound for air. Given γ = 1.4,

ρ = 1.29 kg m−3

and p = 1.01 × 105

Nm−2

.

Answer 1

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