ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 When a fluid is in motion, its flow can be considered as turbulent streamline either or them neither of them
2 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
3 During the steady flow, different streamlines cannot across each other can across each other either of them neither of them
4 When each particle of the fluid moves along a smoth path, this path is known as straight path smooth path haphazard path steamline
5 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
6 The direction of the streamlines is the same as the direction of the force torque velocity weight
7 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
8 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>
9 At the starting point of the free fall motion of an object, its acceleration will be maximum minimum zero none of them
10 The body will move with terminal velocity when it acquires minimum speed zero speed maximum speed none of them
11 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
12 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
13 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
14 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
15 At low speeds, the drag force is proportional to speed inversely proportional to speed not simply proportional to speed none of them
16 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
17 According to slok's law, drag force depends on Radius of the spherical body Terminal velocity of body Coefficient of viscosity All of above
18 When the speed of a body in a fluid increases then the drag force decreases becomes zero increases non of them
19 An object moving through a fluid experiences a retarding force called a frictional force terminal force opposing force drag force
20 Liquids and gasses have zero viscosity non-zero viscosity very large viscosity very small viscosity
21 Substances that flow easily have large coefficient of viscosity small coefficient of viscosity either of them none of them
22 Substances that do not flow easily have large coefficient of viscosity small coefficient of viscosity either of them none of them
23 How much force is required to slide one layer of the liquid over the other layer is measured by friction density viscosity resistivity
24 The effect of friction between different layers of a flowing fluid is described in terms of motion of fluid nature of fluid colour of fluid viscosity of fluid
25 The law of conservation of energy gives us equation of continuity Bernoulli's theorem both of them none of them
26 The law of conservation of mass gives us the equation of continuity Bernoulli's theorem both of them none of them
27 The analysis of fluid motion becomes simplified by using law of conservation law of conservation of energy both of them none of them
28 Which quantity has the same units as impulse force work linear momentum acceleration
29 The product of force and time is called acceleration linear momentum angular momentum impulse
30 The entity which measures the quantity of motion in a body is called force energy momentum power
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