Multiple choice questions of Chapter 6 of Physics for First Year.

1. The study of properties of fluids in motion is called
a) Fluid
b) Fluid statics
c) Fluid dynamics
d) None

2. 𝜂 Is denoted for coefficient of:
a) Friction
b) Viscosity
c) Linear expansion
d) Gravitational customer

3. An object moving through a fluid experience a retarding force called
a) Drag force
b) Gravitational force
c) Terminating force
d) Frictional force

4. The maximum constant velocity of an object falling vertically downward is called:
a) Final velocity
b) Terminal velocity
c) Initial velocity
d) None of these

5. The drag force increases as the speed of the object
a) Increases
b) Decreases
c) Remain constant
d) None of these

6. The equation 𝐹 = 6𝜋𝜂𝑟𝑣 is called:
a) Newton’s law
b) Stoke’s law
c) Ohm’s law
d) Lenz’s law

7. Stokes law is applicable if body has __________ shape.
a) Rough
b) Square
c) Circular
d) Spherical

8. Drag force is given by
a) Newton’s law
b) Pascal’s law
c) Gauss’s law
d) Stoke’s law

9. When weight of an object falling freely becomes equal to the drag force, then the body will move with
a) Increasing speed
b) Decreasing speed
c) Constant speed
d) None of them

10. When the body reaches its terminal velocity, the acceleration of the body becomes
a) Maximum speed
b) Minimum speed
c) Zero
d) Constant quantity

11. As the water falls from tap, its speed increases and cross sectional area:
a) Zero
b) Increases
c) Decreases
d) Remains constant

12. If radius of droplet becomes half then its terminal velocity will be
a) Half
b) Double
c) One forth
d) Four times

13. Turbulent flow is:

14. The flow of ideal fluid is always:

a) Turbulent
b) Streamline
c) Irregular
d) Straight line

15. Irregular flow of fluid is called:

a) Streamline
b) Turbulent
c) Uniform
d) Laminar

16. According to equation of continuity,  A1V1 = A2V2 = constant. The constant is equal to:

a) Flow rate
b) Volume of fluid
c) Mass of fluid
d) Density of fluid

17. Equation of continuity is obtained by applying law of conservation of
a) Mass
b) Energy
c) Momentum
d) All

18. If cross-sectional area of pipe decreases, the speed of fluid must increase according to:

a) Venturi relation
b) Bernoulli’s equation
c) Equation of continuity
d) Torricelli’s theorem

19. In equation of continuity, the units of Av is given as:
a) Cubic meter
b) Cubic meter per second
c) Square meter per second
d) Square meter

20. The law of conservation of mass gives:
a) Bernoulli’s equation
b) Equation of continuity
c) Torricelli theorem
d) None of these

21. Bernoulli’s theorem applies to:

a) Solids
b) Plasma state
c) Fluids
d) Liquids

22. Velocity of fluid increases where the pressure is:
a) Low
b) High
c) Constant
d) Changes continuously

23. Speed of efflux can be determined by applying:
a) Pressure-velocity relationship
b) Torricelli’s theorem
c) Venture relation
d) All

24. Venturi meter is a device used to measure:
a) Pressure of the fluid
b) Speed of fluid
c) Density of fluid
d) Viscosity of the fluid

25. A man standing near a fast moving train may fall.
a) Away from the train
b) Towards the train
c) On himself
d) None of these

26. Bernoulli’s equation is obtained by applying law of conservation of.
a) Mass
b) Energy
c) Momentum
d) Fluid

27. Ideal fluid is.
a) Non-viscous
b) Incompressible
d) Possess all properties

28. Velocity of efflux is measured by relation
a)  𝑔ℎ
b)  𝑔ℎ 2
c)  2𝑔ℎ
d)  4𝑔ℎ 3

29. The mathematical relation 𝑣 = 2𝑔 ℎ2 − ℎ1  is known as:
a) Equation of continuity
b) Torricelli’s theorem
c) Bernoulli’s equation
d) Ventra relation

30. Swing is produced to:
a) Increase the speed of ball
b) Decrease the speed of ball
c) Deceive the player
d) Applying the force on the ball

31. Blood has density equal to that of:
a) Mercury
b) Sodium
c) Honey
d) Water

32. For which position, blood pressure in the body have the smallest value?
a) Standing straight
b) Sitting on chair
c) Sitting on ground
d) Lying horizontally