# Absolute Entropy - MCQs with Answers

Q1. At the state of perfect order (W = 1) of pure crystalline substance, how is the zero entropy defined?

a. entropy at 0 °C temperature
b. entropy at absolute zero temperature
c. entropy at the freezing point of the substance
d. none of the above

ANSWER: b. entropy at absolute zero temperature

Q2. What is the reason behind the fact that the absolute zero entropy value is not attainable?

a. because absolute zero temperature is not attainable in finite number of operations
b. because theoretically absolute zero temperature has negative value of entropy and it is not possible
c. both a. and b.
d. none of the above

ANSWER: a. because absolute zero temperature is not attainable in finite number of operations

Q3. What is the entropy chosen at the triple point of water?

a. zero
b. less than zero
c. more than zero
d. none of the above

Q4. What is the equation for entropy of a system if two parts 1 and 2 having entropies S1 and S2 are considered in equilibrium?

a. S = S1 – S2
b. S = S1 + S2
c. S = (S1 + S2) / 2
d. S = √S1 S2