UY1 Thermodynamics Quiz

Exam-style MCQs on first/second law reasoning, gas processes, cyclic work, engine efficiency, COP, kinetic-theory links, and heat transfer fundamentals.

University Physics Year 1

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Using the convention $Q>0$ into system and $W>0$ by system, which first-law form is correct?

$\Delta U=Q+W$
$\Delta U=Q-W$
$\Delta U=W-Q$
$\Delta U=-Q-W$

For a complete cyclic process, which statement is true?

$\Delta U=0$
$Q=0$
$W=0$
$\Delta T=0$ at all points

For an isothermal expansion of an ideal gas, which is correct?

$\Delta U>0$
$\Delta U<0$
$\Delta U=0$
$Q=0$

For a reversible adiabatic process of an ideal gas, which relation applies?

$PV=\text{const}$
$PV^\gamma=\text{const}$
$P/T=\text{const}$
$V/T=\text{const}$

On a $P$-$V$ diagram, the net work done by gas in one clockwise cycle equals

negative enclosed area
zero
positive enclosed area
area under only one branch

A heat engine takes $Q_H=500\,\text{J}$ from hot reservoir and rejects $Q_C=300\,\text{J}$. Its efficiency is

For a refrigerator, coefficient of performance (COP) is defined as

$W/Q_L$
$Q_L/W$
$Q_H/W$
$W/Q_H$

A monatomic ideal gas has molar heat capacities related by

$C_p-C_v=0$
$C_p-C_v=R$
$C_p=C_v/\gamma$
$C_p/C_v=R$

For ideal gases at same temperature, root-mean-square speed scales as

$v_{\text{rms}}\propto \sqrt{M}$
$v_{\text{rms}}\propto 1/\sqrt{M}$
$v_{\text{rms}}\propto M$
$v_{\text{rms}}\propto 1/M$

During boiling of a closed sample at constant pressure, added heat primarily changes

temperature
phase (internal configuration)
mass
external pressure

For one-dimensional conduction through a slab of thickness $L$, area $A$, conductivity $k$, and temperature drop $\Delta T$, steady heat rate is

$\dot Q=kA\Delta T/L$
$\dot Q=kL\Delta T/A$
$\dot Q=A\Delta T/(kL)$
$\dot Q=kA/(L\Delta T)$

Which statement best reflects the second law of thermodynamics?

Heat can spontaneously flow from cold to hot with no work input
No heat engine can convert all absorbed heat entirely into work in a cycle
Entropy of an isolated system always decreases
All reversible and irreversible engines have the same efficiency

UY1 Thermodynamics Quiz

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