Fluid flows through a pipe in a horizontal plane. The fluid has a relative density of 0.9 and its velocity at P (where cross-section area is A) is 4 m/s. What is its pressure at Q? (where cross-section area is , The pressure at P is 2.8 x 10 Pa.)
1. 2.36 x 10 Pa
2. 3.88 x 10 Pa
3. 2.08 x 10 Pa
4. 1.72 x 10 Pa
In a horizontal pipe line the pressure falls by between two points separated by a distance of 2 km. Density of oil is . Change in kinetic energy per kg of the oil flowing in the tube is:
1.
2.
3.
4.
Three liquids of densities \(d,\) \(2d\) and \(3d\) are mixed in equal proportions of weights. The relative density of the mixture is:
1. | \(11d \over 7\) | 2. | \(18d \over 11\) |
3. | \(13d \over 9\) | 4. | \(23d \over 18\) |
A tank is filled with water up to a height h and the pressure at the bottom of the tank is 3P where P is the atmospheric pressure. The height of a point from the bottom of the tank where pressure is is:
1.
2.
3.
4. None of these
A body of density \(0.7\) g/cm3 floats on a lake of water. The fraction of the body that is outside water is:
1. \(30 \text{%}\)
2. \(70 \text{%}\)
3. \(25 \text{%}\)
4. \(50 \text{%}\)
A small spherical solid ball is dropped in a viscous liquid. Its journey in the liquid is best described in the figure by:
1. | curve A | 2. | curve B |
3. | curve C | 4. | curve D |
Water flows through a frictionless duct with a cross-section varying as shown in the figure. Pressure p at points along the axis is represented by:
1. | 2. | ||
3. | 4. |
Equation of continuity is based on:
1. | Conservation of mass |
2. | Conservation of energy |
3. | Conservation of angular momentum |
4. | None of these |
An inverted bell lying at the bottom of a lake 47.6 m deep has 50 cm3 of air trapped in it. The bell is brought to the surface of the lake. The volume of the trapped air will be: (atmospheric pressure = 70 cm of Hg and density of Hg = 13.6 g/cm3)
1. 350 cm3
2. 300 cm3
3. 250 cm3
4. 22 cm3
A siphon in use is demonstrated in the following figure. The density of the liquid flowing in the siphon is 1.5 gm/cc. The pressure difference between the point P and S will be:
1. | 105 N / m | 2. | 2 × 105 N / m |
3. | Zero | 4. | Infinity |