Question 2 :
A small steel ball falls through a syrup at a constant speed of $10 cm/sec.$ If the steel ball is pulled upwards with a force equal to twice its effective weight; how fast will it move upwards?

Question 4 :
When a sphere falling in a viscous fluid attains a terminal velocity, then:

Question 5 :
Answer true or false. 'Faster the movement of the air greater is the drop in pressure'.

Question 6 :
The Bernoulli's equation that is valid for non-viscous, incompressible fluids having laminar flow is a consequence of

Question 7 :
Two spheres of radii ${r}_{1}$ and ${r}_{2}$ (${r}_{1}> {r}_{2})$ is dropped through a tube full of glycerine. Their terminal velocities ${v}_{1}$ and ${v}_{2}$ are calculated in the experiment. Which of the following is true?

Question 8 :
Assertion: A raindrop after falling through some&#160;height attains a constant velocity<br/>Reason: At constant velocity, the viscous drag is&#160;equal to its weight.

Question 9 :
If the diameter of a soap bubble is 20 mm and&#160;if the surface tension of soap water is 0.04N.m$^{-1}$, the excess pressure inside the bubble is in Nm$^{-2}$ is :<br/>

Question 11 :
The wettability of a surface by a liquid depends primarily on:<br/>

Question 13 :
There are two liquid drops of different radii. The excess pressure inside over the outside is:-

Question 14 :
Two liquid drops have their diameters as $1 \ mm$ and $2 \ mm$. The ratio of excess pressures&#160;in them is :

Question 16 :
According to Stoke&#8216;s law, the viscous drag force,&#160;on an oil drop is proportional to:<br/>

Question 17 :
When two small bubbles join to form a bigger one, energy is<br/>

Question 18 :
A small metal sphere of radius $a$ is falling with a velocity $v$ through a vertical column of a viscous liquid. If the coefficient of viscosity of the liquid is $\eta $, then the sphere encounters an opposing force of:

Question 20 :
After terminal velocity is reached the acceleration of a body falling through a viscous fluid is :

Question 22 :
A steel ball of mass 'm' falls in a viscous liquid with a terminal velocity $4 ms^{-1}$ . If another steel ball of mass 8m falls through the same liquid then its terminal velocity is <br>

Question 23 :
The energy needed in breaking a drop of radius $R$ into $n$ drops of radius $r$ is

Question 24 :
A large number of liquid drops, each of radius&#160;r, coalesce to form a single drop of radius R. The energy released in the process is&#160;converted into the kinetic energy of the big drop&#160;so formed. The speed of the big drop is : (T $=$ surface tension, $\rho&#160;=$ density of liquid)

Question 25 :
A tank with vertical walls is mounted so that its&#160;base is at a height of $1.2 m$ above the horizontal&#160;ground. The tank is filled with water to a depth $2.8m.$ A hole is punched in the side wall of thetank at a depth $x \ m$ below the surface of water to&#160;have maximum range of the emerging stream.Then the value of $x$ in meter is