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

1. The study of properties of fluids in motion is calleda) 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:

a) Unsteady and regular

b) Steady and regular

**c) Unsteady and irregular**

d) Steady and regular

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

c) Steady flow

**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**

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