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The two thigh bones (femurs), each of cross-sectional area \(10\) cm^{2} 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. \(2\times10^{5}\) Nm^{–}^{2}

3. \(20\times10^{5}\) Nm^{–}^{2}

4. \(20\times10^{6}\) Nm^{–}^{2}

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/m^{3} and \(g=10\) m/s^{2})

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. \(1.9\times 10^{5}~\text{Pa}~\text{and}~1470~\text{N}\)

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 |

61%

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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 = $1.06\times {10}^{3}\mathrm{kg}{\mathrm{m}}^{-3}$)

1. 145 m/s

2. 0.145 m/s

3. 123 m/s

4. 0.123 m/s

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. \(5.5\times 10^{5}~\text{Nm}^{-2}\)

[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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