MCQ
The temperature at which the surface tension of water is zero
  • A
    $0^°\,C$
  • B
    Slightly less than $647 \,K$ 
  • C
    $370^°C$
  • Both (b) and (c)

Answer

Correct option: D.
Both (b) and (c)
d
(d) At critical temperature (${T_c} = {370^o}C = 643\;K$), the surface tension of water is zero.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The superposing waves are represented by the following equations :${y_1} = 5\sin 2\pi (10\,t - 0.1x)$, ${y_2} = 10\sin 2\pi (20\,t - 0.2x)$ Ratio of intensities $\frac{{{I_{\max }}}}{{{I_{\min }}}}$ will be
A body of mass 5kg undergoes a change in speed from 20 to 0.20 m/ s. The momentum of the body would:
A transverse wave propagating on the string can be described by the equation $y=2 \sin (10 x+300 t)$. where $x$ and $y$ are in metres and $t$ in second. If the vibrating string has linear density of $0.6 \times 10^{-3} \,g / cm$, then the tension in the string is .............. $N$
If the pressure in a closed vessel is reduced by drawing out some gas, the mean free path of the molecules
At a given temperature the root mean square velocities of oxygen and hydrogen molecules are in the ratio
A string is stretched between two fixed points separated by $75\,cm$ . It is observed to have resonant frequencies of $420\,Hz$ and $315\,Hz$ . There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is  ..... $Hz$
A ight rod one meter long has two point masses, 0.1kg each, fixed at its ends. the moment of inertia of the system about a transverse axis through its centre of mass is:
Nitrogen gas $N _2$ of mass $28 \,g$ is kept in a vessel at pressure of $10 \,atm$ and temperature $57^{\circ} C$. Due to leakage of $N _2$ gas its pressure falls to $5 \,atm$ and temperature to $27^{\circ} C$. The amount of $N _2$ gas leaked out is .......... $g$
Let Fpp, Fpn and Fnn denote the magnitudes of the net force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively. Neglect gravitational force. When the separation is 1fm:
  1. Fpp > Fpn = Fnn
  2. Fpp = Fpn = Fnn
  3. Fpp > Fpn > Fnn
  4. Fpp < Fpn = Fnn
A body of mass m rises to height $h = R/5$ from the earth's surface, where $R$ is earth's radius. If $g$ is acceleration due to gravity at earth's surface, the increase in potential energy is