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Class 11 Physics: Mechanical Properties of Fluids
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MCQs on fluids mechanical properties pressure and streamline flow, bernoullis equation, fluids viscosity and surface tension.

Class 11 Physics: Mechanical Properties of Fluids
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25 Questions

1. A tube of uniform cross section always has water flowing through it. It is kept vertical in such a way that water enters from top and leaves from the bottom. If the speed at a point A below the opening is 'v', what will be the speed at a point B vertically below A such that the distance between A & B is '2h'?
2. A soap bubble contains two surface layers. What is the excess pressure just inside the first layer when seen from outside the bubble?
3. Area 1 = 10m2, Area 2 = 5m2, rate of flow is 50m3/s. Find the value of H if the tubes contain mercury. Given that liquid flowing in the venturi tube is water.
4. Fluid C has a relative density of 10, while fluid D has a relative density of 15. If the height of liquid C is 7cm, what will be the difference in heights of liquid D in the two tubes? In the diagram point 1 is in liquid D just after the end of liquid C.

5. The speed of efflux, in case of a tank with a hole at the bottom, depends upon which of the following factors? Assume that the area of the tank is > > area of hole.
6. What is Pascal's Law?
7. What will be the terminal velocity of a rain drop of radius (r) 1mm and mass (M) 0.001g falling through air. The coefficient of viscosity of air (η) is 1.8 X 10-5Ns/m2? Neglect buoyant force.
8. On which of these following options is the continuity equation based?
9. The unit of surface tension is same as that of _________
10. In which of the following conditions can the Bernoulli equation not be used?
11. Water having density '⍴' is flowing (steadily) downwards in the given tube. What is the relation between PA & PB?
12. Choose the correct option regarding a streamline.
13. What is the effect of temperature increase on viscosity of liquids and gases?
14. Assume a ball is flying through air at rest. The speed of the centre of the ball is 5m/s (î). If the ball is spinning as shown below, find PB – PA. The ball has a radius (R) of 0.1m. Consider the speed of the ball to be constant as it passes through air. Let density of air be 1kg/m3. ω = 1(ĵ X î) rad/s.

15. Consider two points, A & B, on two different streamlines. Bernoulli Theorem can be applied between points A & B.

16. Which of the following is used to measure pressure?
17. Surface energy is ________________
18. The contact angle determines whether liquid will rise or get depressed along a solid surface. Select the correct statement regarding the same.
19. What will be the change in surface energy when a drop of liquid (S = 0.08N/m) is divided into 10 equal droplets? Radius of initial single drop (R)= 5cm.
20. A block of mass 2kg is going down an incline over a fluid having some viscosity. The block moves with a constant speed of 5m/s. Assuming that the temperature of fluid remains constant, find the coefficient of viscosity of the fluid. Angle of incline is 30° & block is a cube of side 1m. Also given that the thickness of fluid is 1cm.

21. Consider a tank of height 20m filled with liquid of density 100kg/m3. The area of tank is 10m2. If the tank has a hole of area 2m2 at the bottom, find the speed of the liquid flowing out through the hole when the height of liquid in the tank is 10m . Assume speed of liquid descending at top of tank is 5m/s.
22. Pressure decreases when _____
23. 3 containers A, B, C are filled with water as shown in the figure. What is the relation between the pressures at 1, 2, 3? Assume that all jars are stationery.

24. From which of the following is the working of hydraulic machines based on?
25. Viscosity is said to be internal friction between fluid layers. What type of force is it?

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