A soap bubble, blown by a mechanical pump at the mouth of a tube, increases in volume, with time, at a constant rate. The graph that correctly depicts the time dependence of pressure inside the bubble is given by

  • [JEE MAIN 2019]
  • A
    820-a1188
  • B
    820-b1188
  • C
    820-c1188
  • D

    None of these

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  • [JEE MAIN 2014]

A hot air balloon is a sphere of radius $8$ $m$. The air inside is at a temperature of $60^{°}$ $C$. How large a mass can the balloon lift when the outside temperature is $20^{°}$ $C$ ? Assume air is an ideal gas, $R = 8.314\,J\,mol{e^{ - 1}},1\,atm = 1.013 \times {10^5}{P_a},$ the membrane tension is $= 5\,N/m$.

Two long parallel glass plates has water between them. Contact angle between glass and water is zero. If separation between the plates is $'d'$ ( $d$ is small). Surface tension of water is $'T'$ . Atmospheric pressure = $P_0$ . Then pressure inside water just below the air water interface is 

A soap bubble assumes a spherical surface. Which of the following statement is wrong

Formation of bubble are in Column - $\mathrm{I}$ and pressure difference between them are given in Column - $\mathrm{II}$. Match them appropriately.

Column - $\mathrm{I}$ Column - $\mathrm{II}$
$(a)$ Liquid drop in air $(i)$ $\frac{{4T}}{R}$
$(b)$ Bubble of liquid in air $(ii)$ $\frac{{2T}}{R}$
  $(iii)$ $\frac{{2R}}{T}$