TS EAMCET 2022 (Online) 18th July Morning Shift | Heat and Thermodynamics Question 101 | Physics

If the root mean square (rms) speed of nitrogen molecules at room temperature is $100 \mathrm{~m} / \mathrm{s}$, then the rms speed of helium molecule at the same temperature is

$100 \sqrt{7} \mathrm{~m} / \mathrm{s}$

$350 \mathrm{~m} / \mathrm{s}$

$50 \sqrt{14} \mathrm{~m} / \mathrm{s}$

$100 \mathrm{~m} / \mathrm{s}$

TS EAMCET 2020 (Online) 14th September Evening Shift

MCQ (Single Correct Answer)

-0

If $\alpha_V$ and $T$ are the coefficient of volume expansion and temperature for an ideal gas respectively, then

$\alpha_V=\frac{1}{T}$

$\alpha_V=\sqrt{T}$

$\alpha_V=\frac{1}{\sqrt{T}}$

$\alpha_V=\frac{1}{T^2}$

TS EAMCET 2020 (Online) 14th September Evening Shift

MCQ (Single Correct Answer)

-0

If $\lambda$ denotes the wavelength at which the radiative emission from a black body at a temperature $T$ is maximum, then

$\lambda \propto T^{-1}$

$\lambda \propto T^4$

$\lambda$ is independent of $T$

$\lambda \propto T$

TS EAMCET 2020 (Online) 14th September Evening Shift

MCQ (Single Correct Answer)

-0

A Carnot engine $C_1$ operates between temperature $T_1$ and $T_2\left(T_1>T_2\right)$. A second Carnot engine $C_2$ uses all the heat rejected by the engine $C_1$ and operates between temperature $T_2$ and $T_3$ (where $T_2>T_3$ ). The efficiency of this combined ( $C_1$ and $C_2$ together) engine is

$1-\frac{T_3}{T_1}$

$2-\left(\frac{T_2}{T_1}+\frac{T_3}{T_2}\right)$

$1-\frac{\left(T_2+T_3\right)}{T_1}$

$1-\left(1-\frac{T_2}{T_1}\right)\left(1-\frac{T_3}{T_2}\right)$

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