11th Physics MCQs Preparation (Unit: Fluid Dynamics: Set-1 (34 MCQs)) for NMDCAT, Engineering College Admission,  Lecturer JOB Exam, ECAT, ICS, F.Sc, BSc, MSc Exam Etc..



1. Viscosity of a fluid depends upon;




... Answer is D. Temperature
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2. Drag force exerted by the fluid on a body does not depend upon:




... Answer is D. Volume of fluid
F = 6ㄫηrv


3. A steel ball of radius 'r' is moving with uniform velocity 'v' in the mustard oil, the drag force acting on the ball is 'F'. What would be the drag force on the steel ball of radius 2r moving with uniform velocity 2v in the mustard oil;




... Answer is C. 4F
F = 6ㄫηrv


4. When two spheres of the same volume but different mass fall through a fluid then;




... Answer is D. Heavier body gains its terminal velocity earlier
Heavy objects will have a higher terminal velocity than light objects. Because It takes a larger air resistance force to equal the weight of a heavier object. A larger air resistance force requires more speed


5.  Laminar flow usually occurs at speeds.




... Answer is A. Low
Laminar flow occurs at low speeds


6. In incompressible fluid, which parameter remains constant?




... Answer is D. Density
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7. Equation of continuity has been derived on the basis of the law of conservation of :




... Answer is C. Mass
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8. According to the equation of continuity A₁v₁ = A₂v₂ = constant. The constant is equal to




... Answer is A. Flow rate
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9. When the cross-sectional area of a tube is decreased then the speed of fluid through it is;




... Answer is A. Increased
Av = constant


10. As the water falls its speed increases, and so its cross-sectional area:




... Answer is B. Decreases`
 Equation of continuity Av = constant


11. Bernoulli's equation has been derived on the basis of conservation of;




... Answer is B. Energy
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12. What is the speed of water flow through a tap that is connected to a tank that contains water at a height of 2.5 m.




... Answer is C. 7 m s⁻¹
v = `\sqrt {2gh}`


13. A two-metre-high tank is full of water. If a hole appears in its middle, then the speed of efflux is: :




... Answer is A. 4.42 m s⁻¹
v = `\sqrt {2gh}` her h = 1m (half of the tank )


14.  Venturi-meter is an instrument that is being used for the measurement of;




... Answer is B. Velocity of fluid
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15. When the velocity of the fluid is increased then its pressure is;




... Answer is B. Decreased
Bernoulli's Principle


16.. Systolic pressure is called;




... Answer is B. High blood pressure
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17. A certain pipe has a cross-sectional area of 0.0001 m² in which water is flowing at 10 m/s. The volume flow rate is :




... Answer is B.  0.001 m³/s
`\ frac {ΔV}{t}` = Av = 0.0001 m² x 10 m/s = 0.001 m³/s


18. At sufficiently high speeds the flow of viscous fluid becomes




... Answer is D. turbulent
Given: -------------------------


19.  The water in the tank is 10 m above the teak point. The speed with which the water emerges from the teak is




... Answer is B. 14 m/s
V = `\ sqrt {2gh} = `\ sqrt {2 x 10 ms⁻² x 10 m}` = 14 m/s


20. When the radius of the artery is reduced, the blood pressure




... Answer is B. decreased
Given: -----------------------------


21. For substances that do not flow easily (like honey) have the value for the coefficient of viscosity




... Answer is B. high
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22. A unit for viscosity, the centipoise, is equal to which of the following




... Answer is A. 10⁻³ N s/m²
----------------------


23. Stokes law is applicable only if a body is moving through a liquid slow speed and has ______ shape.




... Answer is B. a spherical
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24. The net force that acts on a 10 N falling object, when it encounters 4 N of air resistance is




... Answer is D. 6 N
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25. A skydiver jumps from a high-flying helicopter. Before reaching terminal velocity, her acceleration




... Answer is B.  decrease
----------------------------


26. At terminal velocity the acceleration of a falling object is




... Answer is A. 0 m s⁻²
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27. According to the equation of continuity Av = constant. This constant is equal to :




... Answer is D. volume flow rate
-------------------------


28. At the constriction in the cross-section for ideal flow, from the equation of continuity it follows that the speed of the fluid is




... Answer is A. greater
---------------------------------


29. As the water in a level pipe passes from a narrow cross-section of the pipe to a wider cross-section, the pressure against the wall




... Answer is A. increases
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30. A 4 m high tank filled with water is drilled with four identical small holes at 1 m, 1.5 m, 2 m and 2.5 m from the bottom of the tank, the speed of efflux will be greatest from the hole at




... Answer is A. 1 m
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31. Venturi metre is a device used to measure the




... Answer is B. speed of fluid
-------------------------



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Or 

Select from the below Links for HSSC-I (Class-11) :  Physics MCQS Preparation


1. Unit:  Measurements: Set-1 (32 MCQs), Set-2 (50 MCQs), Set-3 (50 MCQs),                                   Set-4 (50 MCQs),   Set-5 (50 MCQs),  

2. Unit:  Vectors and Equilibrium: Set-1 (34 MCQs), 

3. Unit:  Force and Motion: Set-1 (34 MCQs), 

4. Unit:  Work and Energy: Set-1 (29 MCQs), 

5. Unit:  Rotational and Circular Motion: Set-1 (31 MCQs), 

6. Unit:  Fluid Mechanics or Dynamics: Set-1 (31 MCQs), 

7. Unit:  Oscillations : Set-1 (27 MCQs), 

8. Unit:  Waves : Set-1 (27 MCQs), 

9. Unit:  Physical Optics : Set-1 (27 MCQs), 

10. Unit:  Thermodynamics: Set-1 (34 MCQs),  

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