Question 1 : When a sphere falling in a viscous fluid attains a terminal velocity, then:

Question 3 : 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 4 : 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 5 : If air is blown with a straw under &#160;the pans of a physical balance present in equilibrium position,then that pan :<br/>

Question 6 : The tangential forces per unit area of the liquid layer&#160;required to maintain unit velocity gradient is known as:

Question 7 : In a laminar flow the velocity of the liquid in contact with the walls of the tube is

Question 8 : Curve in the upper surface of a liquid to the surface of the container is known as

Question 9 : Two soap bubbles each of radius r are touching each other. The radius of curvature of the common surface will be :-

Question 11 : A spherical ball of diameter $1$cm and density $5\times 10^3$kg $m^{-3}$ is dropped gently in a large tank containing viscous liquid of density $3\times 10^3$kg $m^{-3}$ and coefficient of viscosity $0.1$Ns $m^{-2}$. The distance, the ball moves in $1$s after attaining terminal velocity is $(g=10ms^{-2})$.

Question 12 : Assertion: Small liquid drops assume spherical shape. Reason: Due to surface tension liquid drops tend to have minimum surface area.

Question 14 : In the case of a fluid, Bernoulli's theorem expresses the application of the principle of conservation of:<br/>

Question 15 : A solid metallic sphere of radius $r$ is allowed to fall freely through air. If the frictional resistance due to air is proportional to the cross-sectional area and to the square of the velocity, then the terminal velocity of the sphere is proportional to which of the following?<br>

Question 16 : Uniform speed of $2 cm$ diameter ball is $20 cm/s$ in a viscous liquid. Then, the speed of $1 cm$ diameter ball in the same liquid is:

Question 17 : If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is

Question 18 : A spherical ball of iron of radius $2\ \text{mm}$ is falling through a column of glycerine. If densities of glycerine and iron are respectively $1.3\times 10^3\ \text{kg/m}^3$ and $8\times 10^3\ \text{kg/m}^3$. $\eta\ {for \ glycerine} = 0.83\ \text{Nm}^{-2}\ \text{sec},$ then the terminal velocity is:

Question 19 : What is the excess pressure inside a soap bubble with a radius of $1.5 cm $ and the surface tension of $0.03 N/m$?

Question 20 : Which one of the following represents the correct dimensions of the quantity&#160;$x=\dfrac{\eta }{\rho }$,where $\eta=$&#160;coefficient of viscosity and $\rho=$ the density of a liquid?