The two thigh bones (femurs), each of cross-sectional area $$10$$ cm2 support the upper part of a human body of mass $$40$$ kg. The average pressure sustained by the femurs is:
1. $$0.2\times 10^{5}$$ Nm–2
2. $$2\times10^{5}$$ Nm2
3. $$20\times10^{5}$$ Nm2
4. $$20\times10^{6}$$ Nm2

Subtopic:  Pressure |
76%
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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

Subtopic:  Pressure |
80%
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The density of the atmosphere at sea level is $$1.29~\text{kgm}^{-3}.$$ Assume that it does not change with altitude. Then how high would the atmosphere extend?
 1 $$8~\text{km}$$ 2 $$5~\text{km}$$ 3 $$7~\text{km}$$ 4 $$6~\text{km}$$
Subtopic:  Pressure |
61%
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At a depth of $$1000~\text{m}$$ in an ocean, the force acting on the window of area $$20~\text{cm}\times 20~\text{cm}$$ of a submarine is? The interior of the submarine is maintained at sea-level atmospheric pressure. (The density of sea water is $$1.03\times 10^{3}~\text{kgm}^{-3}, g = 10~\text{ms}^{-2}$$)
 1 $$4.12\times 10^{4}~\text{N}$$ 2 $$4.12\times 10^{5}~\text{N}$$ 3 $$5.12\times 10^{5}~\text{N}$$ 4 $$5.12\times 10^{4}~\text{N}$$
Subtopic:  Pressure |
78%
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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 $$1.0$$ cm and $$3.0$$ cm respectively. Force exerted on the larger piston when a force of $$10$$ N is applied to the smaller piston:

 1 $$80$$ N 2 $$90$$ N 3 $$10$$ N 4 $$20$$ N
Subtopic:  Pressure |
85%
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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 $$1.0$$ cm and $$3.0$$ cm respectively. If the smaller piston is pushed in through $$6.0$$ cm, how much does the larger piston move out?
 1 $$0.67~\text{cm}$$ 2 $$6.7~\text{cm}$$ 3 $$67~\text{cm}$$ 4 $$6.3~\text{cm}$$
Subtopic:  Pressure |
63%
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In a car lift, the compressed air exerts a force $$F_1$$ on a small piston having a radius of $$5.0$$ cm. This pressure is transmitted to the second piston of a radius of $$15$$ cm. If the mass of the car to be lifted is $$1350$$ kg, the pressure necessary to accomplish this task and the force $$F_1,$$ respectively, are? ($$g = 9.8$$ ms–2)
1. $$1.9\times 10^{6}~\text{Pa}~\text{and}~1400~\text{N}$$
2. $$1.9\times 10^{4}~\text{Pa}~\text{and}~1580~\text{N}$$
3. $$19\times 10^{5}~\text{Pa}~\text{and}~1570~\text{N}$$
4. $$1.9\times 10^{5}~\text{Pa}~\text{and}~1470~\text{N}$$

Subtopic:  Pressure |
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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.   145 m/s

2.   0.145 m/s

3.   123 m/s

4.   0.123 m/s

Subtopic:  Bernoulli's Theorem |
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A fully loaded Boeing aircraft has a mass of $$3.3\times 10^{5}~\text{kg}$$. Its total wing area is $$500~\text{m}^2.$$ It is in level flight with a speed of $$960$$ km/h. The pressure difference between the lower and upper surfaces of the wings is:
[Given: Density of air, $$\rho = 1.2~\text{kgm}^{-3}~\text{and}~g = 9.8~\text{m/s}^2]$$
1. $$6.5\times 10^{4}~\text{Nm}^{-2}$$
2. $$6.5\times 10^{3}~\text{Nm}^{-2}$$
3. $$6.5\times 10^{5}~\text{Nm}^{-2}$$
4. $$5.5\times 10^{5}~\text{Nm}^{-2}$$
Subtopic:  Bernoulli's Theorem |
64%
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A metal block of area $$0.10~\text{m}^{2}$$ is connected to a $$0.010$$ 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 $$0.30$$ mm is placed between the block and the table. When released the block moves to the right with a constant speed of $$0.085$$ 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. $$3.45 \times 10^{-3}~\text{Pa-s}$$

Subtopic:  Viscosity |
53%
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