Questions & Answers
Browse all 20 questions from the
Thermodynamics of the Universe study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
What is the primary mechanism by which the Sun loses energy to the vacuum of space?
-
A
Conduction
-
B
Convection
-
C
Radiation
-
D
Advection
2
Which law of thermodynamics states that the entropy of a perfect crystal at absolute zero is zero?
-
A
Zeroth Law
-
B
First Law
-
C
Second Law
-
D
Third Law
3
What is the approximate temperature of the Cosmic Microwave Background radiation?
-
A
2.7 K
-
B
15 K
-
C
273 K
-
D
3000 K
4
In a star, what thermodynamic process primarily balances the inward gravitational pressure?
-
A
Thermal expansion
-
B
Nuclear fusion pressure
-
C
Conduction of heat
-
D
Phase change
5
Why do gas giants like Jupiter possess higher internal temperatures than their surface exposure suggests?
-
A
Friction from moons
-
B
Gravitational contraction
-
C
Radioactive decay
-
D
Internal nuclear fusion
6
What happens to the temperature of a gas cloud as it collapses under gravity, according to the adiabatic process?
-
A
Decreases
-
B
Remains constant
-
C
Increases
-
D
Fluctuates randomly
7
Which thermodynamic state is characterized by the absence of net energy flow between a planet and its environment?
-
A
Thermal equilibrium
-
B
Adiabatic expansion
-
C
Entropy maximum
-
D
Isochoric process
8
The Stefan-Boltzmann law relates the total energy radiated by a black body to which property?
-
A
Mass
-
B
Volume
-
C
Temperature
-
D
Density
9
Which fundamental thermodynamic quantity measures the degree of disorder or randomness in the universe?
-
A
Enthalpy
-
B
Entropy
-
C
Internal energy
-
D
Gibbs free energy
10
What is the state of a vacuum in terms of thermal conductivity?
-
A
Highly conductive
-
B
Moderately conductive
-
C
Non-conductive
-
D
Superconductive
11
What determines the color of a star based on Wien's Displacement Law?
-
A
Surface temperature
-
B
Chemical composition
-
C
Mass
-
D
Distance from Earth
12
Energy transfer in the radiative zone of the Sun occurs primarily through which particles?
-
A
Protons
-
B
Photons
-
C
Electrons
-
D
Neutrons
13
According to the Second Law of Thermodynamics, what happens to the total entropy of the universe over time?
-
A
It decreases
-
B
It remains constant
-
C
It increases
-
D
It resets periodically
14
Which phenomenon describes the cooling of an expanding universe?
-
A
Adiabatic cooling
-
B
Isobaric cooling
-
C
Convective cooling
-
D
Radioactive cooling
15
Heat transfer by conduction is negligible in outer space because space is a:
-
A
High-pressure environment
-
B
Dense plasma
-
C
Near-perfect vacuum
-
D
Supercooled liquid
16
The 'Heat Death' of the universe is a theoretical scenario based on the maximization of which thermodynamic property?
-
A
Pressure
-
B
Volume
-
C
Entropy
-
D
Temperature
17
What is the source of the high temperatures found in the solar corona compared to the photosphere?
-
A
Nuclear fusion
-
B
Magnetic reconnection
-
C
Radioactive decay
-
D
Gravitational collapse
18
Which thermodynamic cycle describes the theoretical behavior of heat engines, relevant to power generation in space probes?
-
A
Carnot cycle
-
B
Diesel cycle
-
C
Otto cycle
-
D
Rankine cycle
19
What is the primary form of heat transfer from the Sun to the Earth?
-
A
Conduction
-
B
Convection
-
C
Radiation
-
D
Evaporation
20
How does the density of a star's core affect its thermodynamic pressure?
-
A
Higher density increases pressure
-
B
Higher density decreases pressure
-
C
Density is independent of pressure
-
D
Pressure is solely dependent on volume
