Physics Thermodynamics questions from NEET UG 2019.
1 g of water, of volume $1 \mathrm{~cm}^3$ at $100^{\circ} \mathrm{C}$ is converted into steam at same temperature under normal atmospheric pressure $=\left(\simeq 1 \times 10^5 \mathrm{~Pa}\right)$. The volume of steam formed equals $1671 \mathrm{~cm}^3$. If the specific latent heat of vaporisation of water is $2256 \mathrm{~J} / \mathrm{g}$, the change in internal energy is
A copper rod of $88 cm$ and an aluminum rod of unknown length have their increase in length independent of increase in temperature. The length of aluminum rod is $({\alpha }_{Cu}=1.7\times {10}^{-5}{K}^{-1} and {\alpha }_{\mathrm{Al}}=2.2\times {10}^{-5} {K}^{-1})$
A deep rectangular pond of surface area $\mathrm{A}$, containing water (density $=\rho$, specific heat capacity $=s$ ), is located in a region where the outside air temperature is a steady value at the $-26^{\circ} \mathrm{C}$. The thickness of the frozen ice layer in this pond, at a certain instant is $\mathrm{x}$. Taking the thermal conductivity of ice as $\mathrm{K}$, and its specific latent heat of fusion as L, the rate of increase of the thickness of ice layer, at this instant would be given by
An object kept in a large room having air temperature of $25^{\circ} \mathrm{C}$ takes 12 minutes to cool from $80^{\circ} \mathrm{C}$ to $70^{\circ} \mathrm{C}$. The time taken to cool for the same object from $70^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ would be nearly
In which of the following processes, heat is neither absorbed nor released by a system?
Increase in temperature of a gas filled in a container will leads to
The value of $\gamma\left(=\frac{C_p}{C_V}\right)$ for hydrogen, helium and another ideal diatomic gas $\mathrm{X}$ (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to