Question 2 :
The surface tension of liquid is $0.5 N/m$. If a film is held on a ring of area $0.02 m^{2}$, its surface energy is<br>

Question 4 :
A drop of mercury of radius $2 mm$ is split into 8 identical droplets. Find the increase in surface energy. (Surface tension of mercury is $0.465{ J/m }^{ 2 }$)

Question 6 :
Consider the following two statements A and B, and identify the correct option based on these two statements.<br>A) Work done in blowing a soap bubble of radius r and surface tension T is 8$\pi r^{2}$T .<br>B) An impurity which is highly soluble in liquid increases the surface tension of the liquid.

Question 7 :
A steel ball of mass $m$ falls in a viscous liquid with terminal velocity $v$, then the steel ball of mass $8\ m$ will fall in the same liquid with terminal velocity:

Question 8 :
In the case of a fluid, Bernoulli's theorem expresses the application of the principle of conservation of:<br/>

Question 11 :
A sphere of mass M and radius R is falling in a viscous fluid. The terminal velocity attained by the falling object will be proportional to :

Question 12 :
Three immiscible liquid of densities ${ d }_{ 1 }$ &gt; ${ d }_{ 2 }$ &gt; ${ d }_{ 3 }$ and refractive indices $\mu_{ 1 }$ &gt; $\mu_{ 2 }$ &gt; $\mu_{ 3 }$ are put in a beaker. The height of each liquid column is $\dfrac { h }{ 3 }$. A dot is made at the bottom of the beaker. For near normal vision, find the apparent depth of the dot.

Question 13 :
In a meniscus of radius $r$, with excess pressure $p$ in atmospheric pressure $p_{0}$, the force experienced