alleryA Carnot engine with sink at 300 K has 50% efficiency. Its source temperature is
- 600 K
- 450 K
- 900 K
- 150 K
Show answer and solution
Correct answer: A. 600 K
0.5 = 1 - 300/T1 gives T1 = 600 K.
NEET UG Thermal Properties of Matter & Thermodynamics — practice questions — page 5
Explore 134 free Thermal Properties of Matter & Thermodynamics questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.
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A Carnot engine with sink at 300 K has 50% efficiency. Its source temperature isRead the answer and worked solution →The efficiency of a Carnot engine depends on theRead the answer and worked solution →When every step of a Carnot cycle is run backwards, the device acts as aRead the answer and worked solution →Carnot's theorem states that between two given temperatures no engine is more efficient thanRead the answer and worked solution →As temperature approaches absolute zero, the entropy of a system approachesRead the answer and worked solution →The constant entropy a system keeps at absolute zero is called itsRead the answer and worked solution →Which kind of solid can keep a residual entropy well above zero at absolute zero?Read the answer and worked solution →A machine claimed to produce work with no energy input violates theRead the answer and worked solution →In a natural process, the total entropy of the interacting systemsRead the answer and worked solution →In a reversible heat transfer, the heat element δQ equalsRead the answer and worked solution →At absolute zero, a system is in the state of minimum thermal energy known as itsRead the answer and worked solution →For an isolated system, the first law implies that its total energyRead the answer and worked solution →Natural processes tend toward spatial uniformity of temperature. Which law describes this?Read the answer and worked solution →The zeroth law makes thermal equilibrium a relation of which type?Read the answer and worked solution →
Worked practice questions
The efficiency of a Carnot engine depends on the
- mass of the piston
- size of the cylinder
- reservoir temperatures
- working substance used
Show answer and solution
Correct answer: C. reservoir temperatures
Carnot efficiency 1 - T2/T1 depends only on the reservoir temperatures, not on the nature of the working substance.
When every step of a Carnot cycle is run backwards, the device acts as a
- reversible refrigerator
- free expansion chamber
- heat engine of 100% efficiency
- perpetual motion machine
Show answer and solution
Correct answer: A. reversible refrigerator
The reversed cycle takes heat from the cold reservoir with work input and delivers heat to the hot reservoir.
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