भौतिक विज्ञान (Physics) NEET प्रश्न हिंदी में — उत्तर सहित MCQ अभ्यास

(C).  अणुओं की समान संख्या, इसका अर्थ है गैस के मोलों की समान संख्या उपस्थित है।

$$\begin{gathered} \therefore {\mathrm{n}}_{{\mathbf{O}}_{\mathbf{2}}}={\mathrm{n}}_{{\mathbf{N}}_{\mathbf{2}}}=\mathrm{x} \mathrm{say} \\ \therefore {\mathrm{P}}_1\mathrm{V}=\left({\mathrm{n}}_{{\mathbf{O}}_{\mathbf{2}}}+{\mathrm{n}}_{{\mathbf{N}}_{\mathbf{2}}}\right)\mathrm{RT}=2\times \mathrm{RT} \\ {\mathrm{P}}_2\mathrm{V}={\mathrm{n}}_{{\mathbf{O}}_{\mathbf{2}}\mathbf{ }}\mathrm{RT}=\mathrm{x} \mathrm{RT} \\ \therefore \frac{{\mathrm{P}}_1}{{\mathrm{P}}_2}=2 \mathrm{or} {\mathrm{P}}_1=2{\mathrm{P}}_2 \\ \therefore \mathrm{when} \mathrm{nitrogen} \mathrm{is} \mathrm{removed}, \mathrm{final} \mathrm{pressure} \mathrm{will} \mathrm{be} \mathrm{P}/2. \end{gathered}$$

$\left(\mathrm{D}\right). \frac{{\mathrm{n}}_{\mathrm{f}}}{{\mathrm{n}}_{\mathrm{i}}}=\frac{{\mathrm{P}}_{\mathrm{f}}}{{\mathrm{P}}_{\mathrm{i}}} ; {\mathrm{P}}_{\mathrm{f}}={\mathrm{P}}_{\mathrm{i}}\frac{{\mathrm{n}}_{\mathrm{f}}}{{\mathrm{n}}_{\mathrm{i}}} \mathrm{या} \left(2\right) \left(\frac{3}{2}\right)=3 \mathrm{atm}$

$$\begin{gathered} \left(\mathrm{C}\right). 32 \mathrm{gm} {\mathrm{O}}_2=1 \mathrm{mole} {\mathrm{O}}_2 \\ 3 \mathrm{gm} \mathrm{hydrogen}=\frac{3}{2}=1.5 \mathrm{mole} {\mathrm{H}}_2 \\ \mathrm{Hence} \mathrm{total} \mathrm{moles} \mathrm{of} \mathrm{gas} \mathrm{present}=2.5 \\ \therefore \mathrm{volume} \mathrm{of} \mathrm{total} 2.5 \mathrm{moles} \mathrm{of} \mathrm{gas} \mathrm{mix} \mathrm{at} \mathrm{STP} \\ =2.5\times 22.4 = 56 \mathrm{lit}. \end{gathered}$$

$$\begin{gathered} \left(\mathrm{B}\right). \mathrm{K}.\mathrm{E}.=\frac{3}{2}\mathrm{RT} \\ \therefore {\left(\mathrm{K}.\mathrm{E}.\right)}_1=\frac{3}{2}\times \mathrm{R}\times 400; {\left(\mathrm{K}.\mathrm{E}.\right)}_2=\frac{3}{2}\times \mathrm{R}\times 800 \\ \therefore \frac{{\left(\mathrm{K}.\mathrm{E}.\right)}_2}{{\left(\mathrm{K}.\mathrm{E}.\right)}_1}=2 \mathrm{या} {\left(\mathrm{K}.\mathrm{E}.\right)}_2=2{\left(\mathrm{K}.\mathrm{E}.\right)}_1 \end{gathered}$$

$$\begin{gathered} \left(\mathrm{A}\right). \mathrm{K}.\mathrm{E}. \mathrm{for} {\mathrm{UF}}_6=\frac{1}{2}\times {\mathrm{M}}_{{\mathbf{UF}}_{\mathbf{6}}}\times \frac{3\mathrm{RT}}{{\mathrm{M}}_{{\mathbf{UF}}_{\mathbf{6}}}}=\frac{3}{2}\mathrm{RT} \\ \mathrm{K}.\mathrm{E}. \mathrm{for} {\mathrm{H}}_2=\frac{1}{2}\times {\mathrm{M}}_{{\mathbf{H}}_{\mathbf{2}}}\times \frac{3\mathrm{RT}}{{\mathrm{M}}_{{\mathbf{H}}_{\mathbf{2}}}}=\frac{3}{2}\mathrm{RT} \\ \therefore \mathrm{K}.\mathrm{E}. \mathrm{of} {\mathrm{UF}}_6 \mathrm{to} \mathrm{that} {\mathrm{H}}_2 \mathrm{is} 1 \mathbf{:}\mathbf{ }1. \end{gathered}$$

$$\begin{gathered} \left(\mathrm{B}\right). \mathrm{कुल} \mathrm{आयतन}=7 \mathrm{litre}. \mathrm{यह} \mathrm{गैस} \mathrm{में} \mathrm{यह} 3 \mathrm{litre} \mathrm{पात्र}, \mathrm{बाद} \mathrm{मिश्रण}, \mathrm{होगा} \mathrm{होना} \mathrm{एक} \mathrm{आंशिक} \mathrm{दाब} \mathrm{का} \\ \frac{3}{7}\times 202 \mathrm{kPa}=\frac{606}{7}\mathrm{kPa}. \\ \mathrm{इसी\; प्रकार}, \mathrm{यह} 4 \mathrm{litre} \mathrm{पात्र} \mathrm{गैस} \mathrm{होगा} \mathrm{अब} \mathrm{होना} \mathrm{एक} \mathrm{आंशिक} \mathrm{दाब} \mathrm{का} \frac{4}{7}\times 101 \mathrm{kPa}=\frac{404}{7} \mathrm{kPa}. \\ \mathrm{यह} \mathrm{कुल} \mathrm{दाब}=\frac{606}{7}+\frac{404}{7}=\frac{1010}{7} \\ =144\frac{2}{7}\approx 144 \mathrm{kPa}. \end{gathered}$$

$$\begin{gathered} \left(\mathrm{A}\right). \left(\mathrm{P}+\frac{\mathrm{a}}{{\mathrm{V}}^2}\right) \mathrm{V}=\mathrm{RT} \mathrm{or} \mathrm{PV}+\frac{\mathrm{a}}{\mathrm{V}}=\mathrm{RT} \\ \mathrm{or} \frac{\mathrm{PV}}{\mathrm{RT}}+\frac{\mathrm{a}}{\mathrm{RTV}}=1 \mathrm{or} \mathrm{Z}=1-\frac{\mathrm{a}}{\mathrm{RTV}} \end{gathered}$$

$$\begin{gathered} \left(\mathrm{D}\right). \mathrm{In} \mathrm{an} \mathrm{ideal} \mathrm{gas} \mathrm{internal} \mathrm{energy} =\frac{\mathrm{f}}{2} \mathrm{nRT} \\ \mathrm{U}=2\times \frac{5}{2}\times \mathrm{RT}+4\times \frac{3}{2} \mathrm{RT} = 11\mathrm{RT} \end{gathered}$$

1)

जब तापमान दोगुना हो जाता है, तो आयतन दोगुना हो जाएगा (Boyle's law)