The two thigh bones (femurs), each of cross-sectional area $10~\text{cm}^2$ support the upper part of a human body of mass $40~\text{kg}.$ The average pressure sustained by the femurs is:
1. $0.2\times 10^{5}~\text{Nm}^{-2}$ 
2. $2\times10^{5}~\text{Nm}^{-2}$ 
3. $20\times10^{5}~\text{Nm}^{-2}$ 
4. $20\times10^{6}~\text{Nm}^{-2}$ 

Pressure on a swimmer $10$ m below the surface of a lake is:
(Atmospheric pressure= $1.01\times10^{5}$ Pa, density of water = $1000$ kg/m³ and $g=10$ m/s²)
1. $5$ atm
2. $4$ atm
3. $2$ atm
4. $3$ atm

Two syringes of different cross-sections (without needles) filled with water are connected with a tightly fitted rubber tube filled with water. Diameters of the smaller piston and larger piston are $1.0~\text {cm}$ and $3.0~\text{cm}$ respectively. Force exerted on the larger piston when a force of $10~\text N$ is applied to the smaller piston:
1. $80~\text N$
2. $90~\text N$
3. $10~\text N$
4. $20~\text N$

The flow of blood in a large artery of an anesthetised dog is diverted through a Venturi meter. The wider part of the meter has a cross-sectional area equal to that of the artery. A = 8 ${\mathrm{mm}}^2$. The narrower part has an area a = 4 ${\mathrm{mm}}^2$. The pressure drop in the artery is 24 Pa. What is the speed of the blood in the artery?

(Density of blood = $1.06\times {10}^3 \mathrm{kg} {\mathrm{m}}^{-3}$)

1.   145 m/s

2.   0.145 m/s

3.   123 m/s

4.   0.123 m/s

A metal block of area $0.10~\text{m}^{2}$ is connected to a $0.010~\text{kg}$ mass via a string that passes over an ideal pulley (considered massless and frictionless), as in the figure below. A liquid film with a thickness of $0.30~\text{mm}$ is placed between the block and the table. When released the block moves to the right with a constant speed of $0.085~\text{m/s}.$ The coefficient of viscosity of the liquid is:

            
1. $4.45 \times 10^{-2}~\text{Pa-s}$
2. $4.45 \times 10^{-3}~\text{Pa-s}$
3. $3.45 \times 10^{-2}~\text{Pa-s}$
4. $3.45 \times 10^{-3}~\text{Pa-s}$