B.Sc. Physics Exam pinned «An ideal gas expands isobarically at a constant pressure of 2.0 × 10^5 Pa from a volume of 0.01 m^3 to 0.04 m^3. How much work (W) is done by the gas?»
📌Quiz🚨
In an ideal gas undergoing a slow isothermal expansion, what is the exact relationship between the heat added (Q) and the work done (W)?
In an ideal gas undergoing a slow isothermal expansion, what is the exact relationship between the heat added (Q) and the work done (W)?
Anonymous Quiz
57%
Q = W
31%
Q = -W
5%
W = 0
6%
Q = 0
📌quiz🚨
Why is it physically impossible for any real, cyclic heat engine to achieve 100% efficiency?
Why is it physically impossible for any real, cyclic heat engine to achieve 100% efficiency?
Final Results
24%
Friction can never be fully eliminated
10%
Mechanical parts expand when heated
61%
Some heat must always be rejected to a cold reservoir
4%
Gas molecules lose mass at higher temperatures
📌Quiz🚨
If you mix equal masses of hot water and cold water in a perfectly insulated thermos, the total energy is conserved. What happens to the total entropy of the water?
If you mix equal masses of hot water and cold water in a perfectly insulated thermos, the total energy is conserved. What happens to the total entropy of the water?
Anonymous Quiz
8%
It decreases because the hot water cools down
40%
It stays the same because the system is insulated
24%
It increases because heat transfer is irreversible
28%
It drops to zero once thermal equilibrium is reached
B.Sc. Physics Exam pinned «📌Quiz🚨
If you mix equal masses of hot water and cold water in a perfectly insulated thermos, the total energy is conserved. What happens to the total entropy of the water?»
If you mix equal masses of hot water and cold water in a perfectly insulated thermos, the total energy is conserved. What happens to the total entropy of the water?»
📌Quiz🚨
Which of the following describes a thermodynamic process where no heat (Q = 0) is exchanged between the system and its surroundings?
Which of the following describes a thermodynamic process where no heat (Q = 0) is exchanged between the system and its surroundings?
Anonymous Quiz
17%
Isothermal process
15%
Isobaric process
60%
Adiabatic process
8%
Isochoric process
B.Sc. Physics Exam pinned «📌Quiz🚨
Which of the following describes a thermodynamic process where no heat (Q = 0) is exchanged between the system and its surroundings?»
Which of the following describes a thermodynamic process where no heat (Q = 0) is exchanged between the system and its surroundings?»
📌Quiz🚨
According to the Third Law of Thermodynamics, what happens to the entropy of a pure crystalline substance as its temperature approaches Absolute Zero (0 K)?
According to the Third Law of Thermodynamics, what happens to the entropy of a pure crystalline substance as its temperature approaches Absolute Zero (0 K)?
Anonymous Quiz
8%
It approaches infinity
64%
It approaches a constant minimum, effectively zero
15%
It becomes negative
13%
It fluctuates unpredictably
B.Sc. Physics Exam pinned «📌Quiz🚨
According to the Third Law of Thermodynamics, what happens to the entropy of a pure crystalline substance as its temperature approaches Absolute Zero (0 K)?»
According to the Third Law of Thermodynamics, what happens to the entropy of a pure crystalline substance as its temperature approaches Absolute Zero (0 K)?»
📌Quiz🚨
A heat engine absorbs 1000 J of heat from a hot reservoir and performs 300 J of useful work. What is the efficiency (eta) of this engine?
@iitjamphysicsexam
A heat engine absorbs 1000 J of heat from a hot reservoir and performs 300 J of useful work. What is the efficiency (eta) of this engine?
@iitjamphysicsexam
Anonymous Quiz
43%
30%
31%
70%
14%
43%
11%
100\%
When an ideal gas undergoes a free expansion into a vacuum within an isolated container, what happens to its internal energy (Delta U)?
@iitjamphysicsexam
@iitjamphysicsexam
Anonymous Quiz
23%
It increases because the volume increases
29%
It decreases because the gas expands
35%
It remains completely unchanged
13%
It drops directly to zero
B.Sc. Physics Exam pinned «When an ideal gas undergoes a free expansion into a vacuum within an isolated container, what happens to its internal energy (Delta U)?
@iitjamphysicsexam»
@iitjamphysicsexam»
📌Quiz🚨
Why does a typical refrigerator require electrical power supplied to its compressor to keep the inside compartment cold ?
@iitjamphysicsexam
Why does a typical refrigerator require electrical power supplied to its compressor to keep the inside compartment cold ?
@iitjamphysicsexam
Anonymous Quiz
17%
To destroy the heat inside the fridge
12%
To spontaneously turn heat into cold air
58%
To force heat to flow against its natural direction from cold to hot
13%
To create new energy for cooling
📌Quiz🚨
In a P-V diagram, what physical quantity is represented by the total area under the curve for any thermodynamic path?
@iitjamphysicsexam
In a P-V diagram, what physical quantity is represented by the total area under the curve for any thermodynamic path?
@iitjamphysicsexam
Anonymous Quiz
6%
Total Heat Absorbed (Q)
15%
Change in Entropy (\Delta S)
72%
Work Done (W)
7%
Internal Energy (Delta U)
B.Sc. Physics Exam pinned «📌Quiz🚨
In a P-V diagram, what physical quantity is represented by the total area under the curve for any thermodynamic path?
@iitjamphysicsexam»
In a P-V diagram, what physical quantity is represented by the total area under the curve for any thermodynamic path?
@iitjamphysicsexam»
📌Quiz🚨
What happens to the coefficient of performance (COP) of an ideal Carnot refrigerator as the temperature of the cold reservoir gets closer to absolute zero?
@iitjamphysicsexam
What happens to the coefficient of performance (COP) of an ideal Carnot refrigerator as the temperature of the cold reservoir gets closer to absolute zero?
@iitjamphysicsexam
Anonymous Quiz
34%
It approaches infinity
22%
It approaches zero
32%
It stays equal to 1
12%
It fluctuates unpredictably
B.Sc. Physics Exam pinned «📌Quiz🚨
What happens to the coefficient of performance (COP) of an ideal Carnot refrigerator as the temperature of the cold reservoir gets closer to absolute zero?
@iitjamphysicsexam»
What happens to the coefficient of performance (COP) of an ideal Carnot refrigerator as the temperature of the cold reservoir gets closer to absolute zero?
@iitjamphysicsexam»
📌Quiz🚨
A system goes through a complete cyclic process, returning to its initial state. What is the net change in its internal energy (Delta U net) over the full cycle ?
@iitjamphysicsexam
A system goes through a complete cyclic process, returning to its initial state. What is the net change in its internal energy (Delta U net) over the full cycle ?
@iitjamphysicsexam
Anonymous Quiz
11%
Delta U net > 0
8%
Delta U net < 0
70%
Delta U net = 0
11%
Depends on the path taken
B.Sc. Physics Exam pinned «📌Quiz🚨
A system goes through a complete cyclic process, returning to its initial state. What is the net change in its internal energy (Delta U net) over the full cycle ?
@iitjamphysicsexam»
A system goes through a complete cyclic process, returning to its initial state. What is the net change in its internal energy (Delta U net) over the full cycle ?
@iitjamphysicsexam»
📌Quiz🚨
Which law of thermodynamics allows us to define entropy quantitatively as a state function?
@iitjamphysicsexam
Which law of thermodynamics allows us to define entropy quantitatively as a state function?
@iitjamphysicsexam
Anonymous Quiz
11%
Zeroth Law
13%
First Law
54%
Second Law
23%
Third Law