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

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ECAT Pre General Science Physics Chapter 6 Fluid Dynamics Online Test

Sr. # Questions Answers Choice
1 Surface tension of water is due to Inter molecular attractions Inter molecular spaces Inter molecular repulsion None of above
2 Bernoulli's equation is based upon law of conversation Mass Momentum Energy None of these
3 The terminal velocity of a small size spherical body of radius R moving in a fluid varies as R R<sup>2</sup> 1/R (1/R)<sup>2</sup>
4 The velocity of falling raindrops attains limited value because of Up thrust of air Air currents of the earth atmosphere Surface tension effect Viscous force exerted by air
5 In Bernoulli's theorem the relation between velocity and pressure is Inverse Direct None of the above Both a and b
6 In the case of an incompressible fluid in stead flow the net rate of flow of mass entering one end of the tube of flow is equal to the net rate of flow of mass leaving the other end. This equation is called Quadratic equation Equation of discontinuity Equation of continuity None of the above
7 The smooth or steady stream-line flow is know as Laminar flow Turbulent flow Both a and b None of the above
8 With the increase of temperature viscosity Increase Decrease Remains same Doubles
9 The application of Bernoulli's equation is Torricelli's theorem Venture relation Binomial theorem Both a and b
10 Bernoulli's equation is important in the field of Electrical circuit Magnetism Photoelectric effect Flow of fluids
11 Bernoulli's equation is based upon law of conservation Mass Momentum Energy None of these
12 With increase of temperature, the viscosity of liquid and gases Increases for both Decreases for both Increases for liquids and decreases for gases Decreases for liquids and increases for gases
13 The velocity of falling raindrop attains limited value because of Up trust of air Viscous force exerted by air Surface tension effect Air currents atmosphere
14 The SI unit of viscosity is kg m<sup>-1</sup>s<sup>-1</sup> kg ms<sup>-1</sup> kg m<sup>-1</sup>s<sup>-2</sup> kg m<sup>-1</sup>s
15 Matter is made up of very tiny particles called Atoms Molecules Ions None of these
16 A fluid at a certain point has 50 J of potential energy per unit volume, 75 J of kinetic energy per unit volume,and 35 J of pressure energy per unit volume. the total energy of the fluid is 125 J 90 J 160 J 85 J
17 The equation of continuity
A1V1= A2V2is for the flow of
 an ideal fluid an incompressible fluid a non visconcous fluid all of the above
18 What is another name for laminar flow? streamline unsteady flow turbulent flow both (a) and (b)
19 Blood pressure is measured in torr. Which of the following units could belong to torr? N m<sup>-1</sup> N m<sup>-2</sup> N m N<sup>-1</sup>m<sup>-2</sup>
20 Fluids have three types of energies. The Bernoulli's equation combines those energies.which of the following is one of the three enrgies possessed by a fluid? potential energy pressure energy strain energy (a) and (b) only
21 The flow of an ideal fluid is streamline flow incompressible flow non-viscous all of the above
22 Which of the following is a characteristic of an ideal fluid? it is non-viscous it is incompressible it's motion is steady all of the above
23 The value for systolic blood pressure for a normal healthy person is 140 torr 80 torr 90 torr 120 torr
24 Which of the following options correctly states the equation of continuity for an ideal fluid? A<sub>1</sub>A<sub>2</sub>= V<sub>1</sub>V<sub>2</sub> A<sub>1</sub>/A<sub>2</sub>= V<sub>2</sub>/V<sub>1</sub> A<sub>1</sub>/A<sub>2</sub>= V<sub>1</sub>/V<sub>2</sub> none of the above
25 Which of the following has the greatest coefficient of viscosity? water gasoline honey tar
26 What are the SI base units of the coefficient of viscosity Kg m s<sup>-2</sup> kgm<sup>2</sup> s<sup>-2</sup> Kg m s<sup>-1</sup> kg m<sup>-1</sup>s<sup>-1</sup>
27 Which of the following options states the names of fluids in the order of increasing viscosity? mercury, motor oil, methanol methanol, mercury, motor oil motor oil, mercury, methanol methanol, motor oil, mercury
28 Viscosity is defined as the friction between fluid and its container's walls the internal friction between two layers of fluid the resistance to flow a fluid experiences the extent to which outside factors effect the fluid's flow
29 Bernoulli's equation is applicable for turbulent flow streamline flow both (a) and (b) all kinds of flows
30 The value of viscosity of a fluid is dependent on (at constant temperature) the fluid itself the fluid and its container anything in contact with the fluid all of the above
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