Thermodynamics Practice Questions
NEET · Physics · 1416 free MCQs with instant results and detailed explanations.
1416
Total
348
Easy
626
Medium
442
Hard
Start Practicing Thermodynamics
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Topics in Thermodynamics
Refrigerators
238
Thermal Equilibrium
245
First Law
246
Zeroth Law
249
Heat Engines
196
Second Law
242
Sample Questions from Thermodynamics
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is thermal equilibrium?
A.
Two bodies at different temperatures.
B.
Two bodies at the same temperature.
C.
Two bodies exchanging heat energy.
D.
Two bodies with equal mass.
Show Answer & Explanation
Correct Answer: B
Thermal equilibrium occurs when two bodies reach the same temperature and no heat flows between them, indicating they are in thermal balance.
Q2
Easy
When heat is added to a substance at its melting point, it primarily causes:
A.
Increase in temperature.
B.
Increase in pressure.
C.
Change of phase.
D.
Decrease in temperature.
Show Answer & Explanation
Correct Answer: C
At the melting point, adding heat causes the substance to change its phase from solid to liquid without raising its temperature.
Q3
Easy
Which of the following statements is true regarding thermal equilibrium?
A.
Heat flows from colder to hotter objects.
B.
Heat flow stops when equilibrium is achieved.
C.
Thermal energy cannot be exchanged.
D.
Equilibrium is reached at varying temperatures.
Show Answer & Explanation
Correct Answer: B
When thermal equilibrium is achieved, there is no net heat flow between objects, meaning heat transfer stops.
Q4
Medium
Two objects of different temperatures are placed in thermal contact. What will happen to their temperatures over time?
A.
Both will increase to the average temperature.
B.
Both will decrease to the average temperature.
C.
One will increase while the other decreases until thermal equilibrium is reached.
D.
Their temperatures will remain unchanged.
Show Answer & Explanation
Correct Answer: C
When two objects at different temperatures come into contact, heat will flow from the hotter object to the cooler one until they reach thermal equilibrium, which means one object's temperature will decrease while the other's will increase.
Q5
Medium
If 100 grams of water at 100Ā°C is mixed with 200 grams of water at 20Ā°C, what will be the final temperature of the mixture?
A.
80Ā°C
B.
60Ā°C
C.
40Ā°C
D.
50Ā°C
Show Answer & Explanation
Correct Answer: B
To find the final temperature, we use the principle of conservation of energy. The heat lost by the hot water equals the heat gained by the cold water. Setting up the equation leads to a final temperature of 60Ā°C.
Q6
Medium
A metal rod is heated at one end. What happens to the other end of the rod?
A.
It remains cold.
B.
It heats up immediately.
C.
It heats up gradually over time.
D.
The temperature decreases.
Show Answer & Explanation
Correct Answer: C
The heat from the heated end of the rod will conduct through the metal, causing the temperature at the other end to gradually increase due to thermal conduction.
Q7
Medium
What is the condition for thermal equilibrium between two objects?
A.
Both objects must have the same mass.
B.
Both objects must be at the same temperature.
C.
Both objects must have the same specific heat capacity.
D.
Both objects must be made of the same material.
Show Answer & Explanation
Correct Answer: B
Thermal equilibrium is achieved when two objects in thermal contact have the same temperature, resulting in no net heat flow between them.
Q8
Hard
In an isolated system, two bodies are brought into thermal contact. If body A has a mass of 5 kg and initial temperature of 100Ā°C, and body B has a mass of 3 kg at 20Ā°C, what will be the final equilibrium temperature assuming no heat loss?
A.
70Ā°C
B.
80Ā°C
C.
90Ā°C
D.
60Ā°C
Show Answer & Explanation
Correct Answer: A
Using the formula for thermal equilibrium, the final temperature can be calculated by equating heat lost by A to heat gained by B: (massA * specificHeat * (T_initialA - T_final)) = (massB * specificHeat * (T_final - T_initialB)). Solving gives 70Ā°C.
Q9
Hard
A 2 kg block of metal at 150Ā°C is placed in 5 kg of water at 25Ā°C. If the specific heat of water is 4.2 kJ/kgĀ°C, what is the equilibrium temperature of the system?
A.
35Ā°C
B.
55Ā°C
C.
45Ā°C
D.
40Ā°C
Show Answer & Explanation
Correct Answer: B
The heat lost by the metal block is equal to the heat gained by the water. Calculating each heat transfer leads to an equilibrium temperature of 55Ā°C.
Q10
Hard
A 0.5 kg steel ball at 120Ā°C is dropped into 1.5 kg of water at 25Ā°C. Calculate the equilibrium temperature. (Specific heat of steel is 0.46 kJ/kgĀ°C)
A.
29.5Ā°C
B.
30Ā°C
C.
31Ā°C
D.
32Ā°C
Show Answer & Explanation
Correct Answer: B
Applying the heat transfer principle, the heat lost by the steel ball equals the heat gained by water. The final temperature results in 30Ā°C after solving the equation.
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Thermodynamics ā NEET Physics Practice Questions Online
This page contains 1416 practice MCQs for the chapter Thermodynamics in NEET Physics. The questions are organized by difficulty ā 348 easy, 626 medium, 442 hard ā so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 6 topics, giving you comprehensive coverage of the entire chapter.