Question

If gas, at constant temperature and pressure expands, then its
a) internal energy increases
b) internal energy remain same
c) internal energy decreases
d) all of the above​

Answer 1

Answer- The above question is from the chapter 'Thermodynamics'.

Let's know about Internal Energy first.

Internal Energy is denoted by E or U.

Every substance is associated with some particular amount of energy which is termed as Internal Energy.

The value of U depends upon the nature of substance, its composition and conditions such as: temperature and pressure.

U is equal to the sum total of large number of energies at microscopic and macroscopic level.

The absolute value of Internal Energy can't be determined.

Units of U are: Joule (J) or ergs or calories.

Given question: If gas, at constant temperature and pressure expands, then its

a) internal energy increases

b) internal energy remain same

c) internal energy decreases

d) all of the above​

Answer: If gas, at constant temperature and pressure expands, then its, internal energy remain same.

∴ b) internal energy remain same is the correct option.