Q. In a closed system, if the internal energy increases, what can be said about the heat and work done? (2020)
A.
Heat is added and work is done on the system
B.
Heat is removed and work is done by the system
C.
Heat is added and work is done by the system
D.
No heat exchange occurs
Solution
According to the first law of thermodynamics, if the internal energy increases, it implies that heat is added to the system and/or work is done on the system.
Correct Answer:
A
— Heat is added and work is done on the system
Q. In a closed system, if the internal energy increases, what can be said about the work done and heat added? (2020)
A.
Work done is positive and heat added is negative
B.
Work done is negative and heat added is positive
C.
Both work done and heat added are positive
D.
Both work done and heat added are negative
Solution
According to the first law of thermodynamics, if the internal energy increases, it implies that either work is done on the system or heat is added to the system.
Correct Answer:
C
— Both work done and heat added are positive
Q. The heat capacity at constant volume is defined as: (2023)
A.
C_v = dQ/dT at constant pressure
B.
C_v = dQ/dT at constant volume
C.
C_v = dW/dT at constant volume
D.
C_v = dQ/dP at constant volume
Solution
The heat capacity at constant volume (C_v) is defined as the amount of heat added to the system divided by the change in temperature at constant volume.
Correct Answer:
B
— C_v = dQ/dT at constant volume
Understanding Thermal Physics, particularly Thermodynamics, is crucial for students preparing for various exams. This subject not only forms a significant part of the curriculum but also helps in grasping essential concepts that are frequently tested. Practicing MCQs and objective questions enhances your exam preparation, allowing you to tackle important questions with confidence and improve your scores.
What You Will Practise Here
Key concepts of the laws of thermodynamics
Understanding of heat engines and refrigerators
Thermodynamic processes: isothermal, adiabatic, and isochoric
Important formulas related to work, heat, and internal energy
Definitions of key terms such as entropy and enthalpy
Diagrams illustrating thermodynamic cycles
Applications of thermodynamics in real-world scenarios
Exam Relevance
Thermal Physics - Thermodynamics is a vital topic in the CBSE curriculum and is also included in various State Board syllabi. It frequently appears in competitive exams like NEET and JEE. Students can expect questions that test their understanding of concepts, application of formulas, and problem-solving skills. Common question patterns include numerical problems, conceptual questions, and theoretical explanations, making it essential to be well-prepared.
Common Mistakes Students Make
Confusing the different thermodynamic processes and their characteristics
Misapplying formulas related to work and heat transfer
Overlooking the significance of units in calculations
Failing to understand the concept of entropy and its implications
FAQs
Question: What are the laws of thermodynamics? Answer: The laws of thermodynamics describe the principles governing energy transfer and conversion, including the conservation of energy and the direction of heat flow.
Question: How can I improve my performance in thermodynamics MCQs? Answer: Regular practice with objective questions, understanding key concepts, and solving previous years' papers can significantly enhance your performance.
Now is the time to boost your understanding of Thermal Physics - Thermodynamics! Dive into our practice MCQs and test your knowledge to excel in your exams.
Soulshift Feedback×
On a scale of 0–10, how likely are you to recommend
The Soulshift Academy?
