COMEDK 2025 Afternoon Shift | Heat and Thermodynamics Question 8 | Physics

A block of metal A is connected in series with another block of metal B such that the two metal blocks have the same area of cross sections. The thermal conductivity of metal A is K and the free end of metal A is at $80^{\circ} \mathrm{C}$. The temperature of the interface is $60^{\circ} \mathrm{C}$ and the free end of metal B is at $20^{\circ} \mathrm{C}$. Assuming the two metals have the same thickness, the conductivity of metal B is:

$2 K$

$4 K$

$\frac{K}{2}$

$\frac{K}{4}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

The mean energy per molecule for a diatomic gas is:

$\left(\frac{5}{2}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$

$\left(\frac{3}{2}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$

$\left(\frac{3}{2 N}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$

$\left(\frac{5}{2 N}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

The ratio of specific heat capacities at constant pressure to that at constant volume for a given mass of a gas is $\frac{5}{2}$. If the percentage increase in volume of the gas while undergoing an adiabatic change is $\frac{3}{2}$, then the percentage decrease in pressure will be:

$\frac{15}{4}$

$\frac{3}{5}$

$\frac{4}{15}$

$\frac{5}{3}$

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