Physics Thermodynamics questions from NEET UG 2018.
A sample of $0.1 \text{g}$ of water at ${100}^{ o}C$ and normal pressure $(1.013\times {10}^{5} N{ m}^{-2})$ requires $54 \text{cal}$ of heat energy to convert to steam at ${100}^{ o}C$. If the volume of the steam produced is $167.1 \text{cc,}$ the change in internal energy of the sample, is
At what temperature will the rms speed of oxygen molecules becomes just sufficient for escaping from the Earth's atmosphere? (Given Mass of oxygen molecules $m=2.76\times {10}^{-26} kg$, Boltzmann's constant ${k}_{B}=1.38\times {10}^{-23} J {K}^{-1}$)
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
The power radiated by a black body is P and it radiates maximum energy at wavelength, ${\lambda }_{0}$. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $\frac{3}{4}{\lambda }_{0}$, the power radiated by it becomes nP. The value of n is
The Volume $(V)$ of a monoatomic gas varies with its temperature $(T)$, as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state $A$ to state $B$, is 