EASY
Earn 100

Distinguish between streamline flow and turbulent flow.

Important Questions on Mechanical Properties of Fluids

EASY
Water flows through a horizontal pipe at a speed V. Internal diameter of the pipe is d. If the water is emerging at a speed V1 the diameter of the nozzle is
MEDIUM
Water flows in a horizontal tube (see figure). The pressure of water changes by 700 N m-2 between A and B where the area of cross section are 40 cm2 and 20 cm2, respectively. Find the rate of flow of water through the tube. (density of water =1000 kg m-3 )
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EASY
A liquid is allowed to flow into a tube of truncated cone shape. Identify the correct statement from the following.
EASY
The cylindrical tube of a spray pump. having 30 holes each of diameter 1 mm, has a crosssection of 6 cm2. If the liquid flow inside the tube is 1.2 m per minute, then the speed of ejection of the liquid through the spray holes is
MEDIUM
Water containing air bubbles flows without turbulence through a horizontal pipe which has a region of narrow cross-section. In this region the bubbles
MEDIUM

What will be the nature of flow of water from a circular tap, when its flow rate increased from 0.18 L min-1 to 0.48 L min-1? The radius of the tap and viscosity of water are 0.5 cm and 10-3 Pa s, respectively. (Density of water : 103 kg m-3)

EASY
Water flows through a horizontal pipe of diameter 2cm at a speed of 3cm s-1. The pipe has a nozzle of diameter 0.5cm at its end. The speed of water emerging from the nozzle is
EASY
Physical processes are sometimes described visually by lines. Only the following can cross
MEDIUM
Water is flowing at a speed of 1.5 m s-1 through a horizontal tube of cross-sectional area 10-2 m2 and you are trying to stop the flow by your palm. Assuming that the water stops immediately after hitting the palm, the minimum force that you must exert should be (density of water = 103 kg m-3)
MEDIUM
Water from a tap emerges vertically downwards with an initial speed of  1.0 ms-1 . The cross - sectional area of the tap is  10-4 m2 . Assume that the pressure is constant throughout the stream of water and that the flow is streamlined. The cross - sectional area of the stream, 0.15 m below the tap would be:
(Take  g=10 ms-2 )
MEDIUM

A cylindrical tank has a hole of 1 cm2 in its bottom. If the water is allowed to flow into the tank from a tube above it at the rate of 70 cm3 s-1, then the maximum height up to which water can rise in the tank is_________

 

EASY
The cylindrical tube of a spray pump has radius R , one end of which has n fine holes, each of radius r . If the speed of the liquid in the tube is V , the speed of the ejection of the liquid through the holes is :
EASY
The surface of water in a water tank of cross section area 750 cm2 on the top of a house is h m. above the tap level. The speed of water coming out through the tap of cross section area 500 mm2 is 30 cm s-1. At that instant, dhdt is x×10-3 m s-1. The value of x will be ______.
HARD
Mumbai needs 1.4×1012 L of water annually. Its effective surface area is 600 km2 and it receives an average rainfall of 2.4 m annually. If 10% of this rain water is conserved, it will meet approximately
EASY

Figure below shows a liquid being pushed out of the tube by a piston having area of cross section 2.0 cm2. The area of cross section at the outlet is 10 mm2. If the piston is pushed at a speed of 4 cm s-1, the speed of outgoing fluid is _____ cm s-1

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EASY
A air bubble of radius 1 cm in water has an upward acceleration of 9.8 cm s2. The density of water is 1 gm cm3 and water offers negligible drag force on the bubble. The mass of the bubble is g = 980 cm/s2.
MEDIUM
A hollow spherical shell at outer radius R floats just submerged under the water surface. The inner radius of the shell is r . If the specific gravity of the shell material is 278 with respect to water, the value of r is:
MEDIUM
An ideal fluid flows (laminar flow) through a pipe of non-uniform diameter. The maximum and minimum diameters of the pipes are 6.4cm and 4.8cm , respectively. The ratio of the minimum and the maximum velocities of fluid in this pipe is:
HARD
The Bhagirathi and the Alaknanda merge at Deoprayag to form the Ganga with their speeds in the ratio 1: 1: 5 . The cross-sectional areas of the Bhagirathi, the Alaknanda and the Ganga are in the ratio 1: 2: 3 . Assuming streamline flow, the ratio of the speed of Ganga to that of the Alaknanda is
MEDIUM
A vessel completely filled with water has holes A and B at depths h and 3h from the top respectively. The hole A is a square of side L and B is a circle of radius r. The water flowing out per second from both the holes is same. Then L is equal to