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. \(2\times10^{5}\) Nm-2
3. \(20\times10^{5}\) Nm-2
4. \(20\times10^{6}\) Nm-2

Subtopic:  Pressure |
 76%
From NCERT
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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 |
 79%
From NCERT
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The density of the atmosphere at sea level is 1.29 kgm-3. Assume that it does not change with altitude. Then how high would the atmosphere extend?

1.   8 km

2.   5 km

3.   7 km

4.   6 km

Subtopic:  Pressure |
 60%
From NCERT
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At a depth of 1000 m in an ocean, the force acting on the window of area 20 cm × 20 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 × 103 kg m-3g = 10 m s–2)

1.   4.12×104 N

2.   4.12×105 N

3.   5.12×105 N

4.   5.12×104 N

Subtopic:  Pressure |
 78%
From NCERT
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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 |
 86%
From NCERT
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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 cm

2.   6.7 cm

3.   67 cm

4.   6.3 cm

Subtopic:  Pressure |
 65%
From NCERT
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In a car lift, the compressed air exerts a force F1 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 F1, respectively, are?

(g = 9.8 ms-2)

1.   1.9×106 Pa and 1400 N

2.   1.9×104 Pa and 1580 N

3.   19×105 Pa and 1570 N

4.   1.9×105 Pa and 1470 N

Subtopic:  Pressure |
 62%
From NCERT
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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 mm2. The narrower part has an area a = 4 mm2. The pressure drop in the artery is 24 Pa. What is the speed of the blood in the artery?

(Density of blood = 1.06×103 kg m-3)

1.   145 m/s

2.   0.145 m/s

3.   123 m/s

4.   0.123 m/s

Subtopic:  Bernoulli's Theorem |
From NCERT
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A fully loaded Boeing aircraft has a mass of 3.3×105 kg. Its total wing area is 500 m2. 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, ρ = 1.2 kgm-3   and g = 9.8 m/s2]

1.  6.5×104 Nm-2

2.  6.5×103 Nm-2

3.  6.5×105 Nm-2

4.  5.5×105 Nm-2

Subtopic:  Bernoulli's Theorem |
 64%
From NCERT
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A metal block of area 0.10 m2 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%
From NCERT
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