Question 2 :
If two soap bubbles of equal radii $r$ coalesce then the radius of curvature of interface between two bubbles will be<br>

Question 3 :
In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from:

Question 4 :
The contact angle between a solid and a liquid is a property of <br>

Question 5 :
Assertion: The shape of a liquid drop is spherical. Reason: The pressure inside the drop is greater than that of outside.

Question 6 :
Bernoulli's principle is based on the law of conservation of :

Question 8 :
Eight drops of equal size are falling through air&#160;with steady velocity of 10 cm/sec. If the drops&#160;coalesce, what could be its terminal velocity?

Question 9 :
The rate of flow of liquid through a capillary tube, in an experiment to determine the viscosity of the liquid,&#160;increases :

Question 10 :
In a laminar flow at a given point the magnitude&#160;and direction of the velocity of the fluid:

Question 11 :
When a drop of water is dropped on oil surface, then :

Question 12 :
A jet of water with area of cross-section 3cm$^2$ strikes a wall at an angle $\theta = 60^o$ to the normal and be rebounds elastically from the wall with the same speed. If the speed of water in the jet is 12 m/s, then the force acting on the wall is

Question 13 :
The pressure energy per unit mass of liquid of density $\rho$ at a pressure P is<br>

Question 14 :
Eight small drops, each of radius $r$ and having same charge $q$ are combined to form a big drop. The ratio between the potentials of the bigger drop and the smaller drop is

Question 15 :
The terminal velocity $V$ of a spherical ball of&#160;lead of radius $R$ falling through a viscous liquid&#160;varies with $R$ such that:

Question 17 :
The end of a glass tube becomes round on&#160;heating due to:

Question 19 :
Read the following statements and pick the correct choice<br>Statement A: With increase in temperature, viscosity of a gas increases and that of a liquid decreases.<br>Statement B: If the density of a small sphere is equal to the density of the liquid in which it is dropped, then the terminal velocity of the sphere will be zero.

Question 20 :
A tube one metre long is filled with liquid of mass $1\space kg$. The tube is closed at both the ends and is revolved about one end in a horizontal plane at $2\space rev/s$. The force experienced by the lid at the other lid is

Question 21 :
The surface tension of soap solution at a temperature $20^o$ C is $2.5 \times 10^{-2} N m^{-1}$. The excess pressure inside a bubble of soap solution of radius 6 mm is then<br/>

Question 22 :
The pressure difference across a pipe of length $5&#160;cm$ is $2\times10^{3}Pa$. Work done by the pressure in&#160;forcing $2m^{3}$ of water through the pipe in joule is :

Question 23 :
A big drop of radius $R$ is formed by $729$ small&#160;drops of water of radius $r$, then the radius of&#160;each small drop will be

Question 24 :
A $50kg$ skydiver falls through the air and reaches terminal velocity after some time. The drag force is a function of velocity given by<br> ${F}_{drag}=-b{v}^{2}$<br>where the negative sign denotes that the drag force is opposite to the direction of the velocity.<br>What is the terminal velocity of the skydiver (assuming the drag constant $b$ is $0.2 {kg}/{m}$)?

Question 25 :
The lower end of a capillary tube of radius r is placed vertically in water. With the rise h of water in the capillary tube, evolved is (Take p as the density of water)

Question 26 :
A small steel ball falls through a syrup at a constant speed of 10 m/s. If the steel ball is pulled upwards with a force equal to twice its effective weight, how fast will it move upwards?

Question 27 :
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 28 :
<p>STATEMENT-1 : At two different points on the same stream line in streamline flow, velocity of a particle may be different.<br>STATEMENT-2 : Pressure and height may be different at two different points on a streamline.</p>

Question 29 :
A cylindrical vessel of cross-sectional area $1000 cm^2$, is fitted with a frictionless piston of mass $10 kg$, and filled with water completely. A small hole of cross-sectional area $10 mm^2$ is opened at a point $50 cm$ deep from the lower surface of the piston. The velocity of efflux from the hole will be

Question 30 :
If 'n' identical water drops assumed spherical each charged to a potential energy U coalesce to a single drop, the potential energy of the single drop is: (Assume that drops are uniformly charged).