ECAT Pre General Science Physics Chapter 6 Fluid Dynamics Online Test With Answers

image
image
image

ECAT Pre General Science Physics Chapter 6 Fluid Dynamics Online Test

Sr. # Questions Answers Choice
1 The irregular and unsteady flow of the fluid is called turbulent flow steady flow either of them both of them
2 When there is no internal frictional forces between the adjacent layers of fluid, then the fluid is called incompressible compressible viscous non viscous
3 The fluid is incompressible, if itsdensity is zero constant very high very small
4 If the flow is incompressible and the flow is steady then the mass of the fluid through the pipe increases decreases becomes zero is conserved
5 The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is called constant rate volume rate flow rate steady rate
6 The product of cross-sectional area of the pipe and the fluid speed at any pint along the pipe is very high very low constant zero
7 According to the equation of continuity, when water falls from the tap, it's speed increases and its cross-sectional area decreases increases becomes zero none of them
8 When a fluid is in motion, its flow can be considered as turbulent streamline either or them neither of them
9 If every particle of the flow that passes a particular point, moves along the same path as followed by particles which passed the point earlier, then this flow is said to be turbulent streamline abrupt none of them
10 During the steady flow, different streamlines cannot across each other can across each other either of them neither of them
11 When each particle of the fluid moves along a smoth path, this path is known as straight path smooth path haphazard path steamline
12 When the different streamlines cannot cross each other, then this condition is known as continuity condition turbulent flow condition steady flow condition none of them
13 The direction of the streamlines is the same as the direction of the force torque velocity weight
14 A water hose with an internal diameter of 20 mm at the outlet discharges 30 kg of water in 60 s. What is water speed at the outlet if density of water is 1000 kg/m3during its steady flow 1.3 m/s 1.6 m/s 1.9 m/s 2.2 m/s
15 The terminal velocity of water droplet of radius 1 x 10-4m and desity 1000 kg m-3descending through air of viscosity 19 x 10-6kg. m-1 s-1 is 2.5 ms<sup>-1</sup> 3.2 ms<sup>-1</sup> 4.3 ms<sup>-1</sup> 1.1 ms<sup>-1</sup>
16 At the starting point of the free fall motion of an object, its acceleration will be maximum minimum zero none of them
17 The body will move with terminal velocity when it acquires minimum speed zero speed maximum speed none of them
18 During the free fall motion of an object, when its weight becomes equal to the drag force, then it will move with maximum speed zero speed maximum speed none of them
19 When weight of an object falling freely becomes equal to the drag force, then the body will move with increasing speed decreasing speed constant speed none of them
20 When a water droplet falls through air, the net force on it is Net force = drag force - weight Net force = weight - drag force Net force = drag force + weight Net force = weight + drag force
21 When a water droplet falling freely through air, the drag force on water droplet increases with th decrease in speed increase in speed pressure none of them
22 At low speeds, the drag force is proportional to speed inversely proportional to speed not simply proportional to speed none of them
23 The maximum drag force on a falling sphere is 9.8 N, it weight is 1 N 9.8 N 4.9 N Cannot be calculated
24 According to slok's law, drag force depends on Radius of the spherical body Terminal velocity of body Coefficient of viscosity All of above
25 When the speed of a body in a fluid increases then the drag force decreases becomes zero increases non of them
26 An object moving through a fluid experiences a retarding force called a frictional force terminal force opposing force drag force
27 Liquids and gasses have zero viscosity non-zero viscosity very large viscosity very small viscosity
28 Substances that flow easily have large coefficient of viscosity small coefficient of viscosity either of them none of them
29 Substances that do not flow easily have large coefficient of viscosity small coefficient of viscosity either of them none of them
30 How much force is required to slide one layer of the liquid over the other layer is measured by friction density viscosity resistivity
Download This Set
×