Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 78

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Question 1
4 / -1

Water is flowing through a horizontal pipe of non-uniform cross-section. At the extreme narrow portion of the pipe, the water will have

A
Maximum speed and least pressure

B
Maximum pressure and least speed

C
Both pressure and speed maximum

D
Both pressure and speed least
Question 2
4 / -1

A liquid flows in a tube from left to right as shown in figure. A₁ and A₂ are the cross-sections of the portions of the tube as shown. Then the ratio of speeds v₁ /v₂ will be

A
A₁ / A₂

B
A₂ / A₁

C

D
Question 3
4 / -1

An application of Bernoulli\'s equation for fluid flow is found in

A
Dynamic lift of an aeroplane

B
Viscosity meter

C
Capillary rise

D
Hydraulic press
Question 4
4 / -1

A raindrop with radius 1.5 mm falls from a cloud at a height 1200 m from ground. The density of water is 1000 kg/m³ and density of air is 1.2 kg/m³. Assume the drop was spherical throughout the fall and there is no air drag. The impact speed of the drop will be

A
27 km/h

B
550 km/h

C
Zero

D
129 km/h

Solution
Question 5
4 / -1

Blood is flowing at the rate of 200 cm³s^–1 in a capillary of cross sectional area 0.5 m². The velocity of flow, in mms^–1, is

A
0.1

B
0.2

C
0.3

D
0.4

Solution
Question 6
4 / -1

A cylindrical vessel of 90 cm height is kept filled upto the brim. It has four holes 1, 2, 3, 4 which are respectively at heights of 20 cm, 30 cm, 45 cm and 50 cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from

A
Hole number 4

B
Hole number 3

C
Hole number 2

D
Hole number 1

Solution
Question 7
4 / -1

In Poiseuilli\'s method of determination of coefficient of viscosity, the physical quantity that requires greater accuracy in measurement is

A
Pressure difference

B
Volume of the liquid collected

C
Length of the capillary tube

D
Inner radius of the capillary tube
Question 8
4 / -1

Aerofils are so designed that the speed of air

A
On top side is more than on lower side

B
On top side is less than on lower side

C
Is same on both sides

D
Is turbulent
Question 9
4 / -1

An incompressible fluid flows steadily through a cylindrical pipe which has radius 2r at point A and radius r at B further along the flow direction. If the velocity at point A is v, its velocity at point B is

A
2v

B
v

C
v/2

D
4v
Question 10
4 / -1

If the terminal speed of a sphere of gold (density = 19.5 kg/m³) is 0.2 m/s in a viscous liquid (density = 1.5 kg/m³), find the terminal speed of a sphere of silver (density = 10.5 kg/m³) of the same size in the same liquid

A
0.133 m/s

B
0.1 m/s

C
0.2 m/s

D
0.4 m/s

Solution