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Q.1. In a constant volume calorimeter, 3.5 g of a gas with molecular weight 28 was burnt in excess oxygen at 298.0 K. The temperature of the calorimeter was found to increase from 298.0 K to 298.45 K due to the combustion process. Given that the heat capacity of the calorimeter is 2.5 kJ K–1, the numerical value for the enthalpy of combustion of the gas in kJ mol–1 is (2009 - 6M)
Ans. 9
Sol. Energy released by combustion of 3.5 g gas = 2.5 × (298.45 – 298) kJ
Energy released by 1 mole of gas 
= 9 kJmol-1
Q.2. One mole of an ideal gas is taken from a to b along two paths denoted by the solid and the dashed lines as shown in the graphs below. If the work done along the solid line path ws and that along the dotted line path is wd, then the integer closest to the ratio wd / ws is : (2010)
Ans. 2
Sol. 
ws = – 2.303 RT log 
ws = – 4.606 × 1.04 = – 4.8 L atm
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FAQs on Integer Answer Type Questions: Thermodynamics - JEE Advanced - 35 Years Chapter wise Previous Year Solved Papers for JEE
| 1. What is thermodynamics? |  |
Ans. Thermodynamics is a branch of physics that deals with the relationships between heat, work, and energy. It focuses on the transfer of energy and the conversion of energy from one form to another.
| 2. What are the laws of thermodynamics? | |
Ans. The laws of thermodynamics are fundamental principles that govern the behavior of energy in a system. The four laws are:
1. The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only transferred or converted.
2. The second law of thermodynamics states that the entropy of an isolated system will always increase over time.
3. The third law of thermodynamics states that as the temperature of a system approaches absolute zero, the entropy approaches a minimum value.
4. The zeroth law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.
| 3. What is the difference between heat and temperature? | |
Ans. Heat and temperature are related but distinct concepts. Heat is the transfer of thermal energy from a hotter object to a colder object. Temperature, on the other hand, is a measure of the average kinetic energy of the particles in a substance. Heat is measured in joules or calories, while temperature is measured in degrees Celsius, Fahrenheit, or Kelvin.
| 4. What is an adiabatic process in thermodynamics? | |
Ans. An adiabatic process is a thermodynamic process in which there is no transfer of heat between a system and its surroundings. In other words, no heat is added to or removed from the system during an adiabatic process. This means that the change in internal energy of the system is solely due to work done on or by the system.
| 5. What is the Carnot cycle? | |
Ans. The Carnot cycle is an idealized thermodynamic cycle that represents the most efficient heat engine possible. It consists of four reversible processes: isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression. The Carnot cycle is used as a benchmark to compare the efficiency of real heat engines and is often studied in the context of the second law of thermodynamics.
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