StudentAidUnit 5: Solids and Fluid Dynamics — Mcqs
11th Class Physics · Unit 5: Solids and Fluid Dynamics
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Multiple Choice Questions
1.The region of stress-strain curve which obeys Hooke's law is:
- a Proportional limit
- b Elastic region
- c Plastic region
- d Yield limit
2.Which of the following is more elastic?
3.Which of the following is polymer solid?
4.The effect of decrease of pressure with the increase in speed of a fluid in horizontal pipe is:
5.The pressure will be low when speed of fluid is:
6.As per law of fluid friction for steady streamline flow, the friction:
- a Varies proportionally to velocity of fluid
- b Varies inversely proportional to pressure
- c Does not depend on pressure
- d First increases then decreases
7.If a stone is submerged in water and it weighs less in water than in air, this phenomenon is due to:
8.The principle of floatation is a direct application of:
9.An ideal flow of any fluid must satisfy:
10.The lift force experienced by an aeroplane wings is primarily due to:
11.In medical field, a venture mask, used to deliver a known oxygen concentration to patients operates is based on:
12.Which of the following is a defining characteristic of a superfluid?
SLO Based Additional MCQs + Past papers MCQs of Punjab Boards
Drag force
1.The drag force increases as the speed of object:
2.An object moving in a fluid experiences a retarding force called:
3.The drag force F on a sphere of radius r moving slowly with speed v through a fluid of viscosity η is given by:
4.Body is moving through air in upward direction the net force (F) acting on the body is:
- a F = W-Fd
- b F = W + Fd
- c F = Fd - W
- d F = Fd + W
5.When a fog droplet falls down with an acceleration then net force acting on it is:
Equation of continuity
6.Law of conservation of mass gives us the equation of:
7.For an incompressible fluid in steady flow, the equation of continuity is:
8.The product of cross sectional area of the pipe and the fluid speed at any point is:
Viscosity
9.The force required to slide one layer over other layer of liquid is measured by:
10.The viscosity of air in N s m^-2 is:
11.The viscosity of liquid with rise in temperature:
12.The S.I unit of viscosity is:
- a kg m^-1s^-1
- b kg m^-1s^-1
- c ms^-1
- d m^-2s^-1
13.Which liquid can flow easily?
14.The viscosity of the gas with increase in temperature:
Bernoulli's equations
15.In the relation F = 6πηrv dimension of co-efficient of viscosity η is:
16.Law of conservation of energy is on the basis of:
17.Pressure will be low where speed of fluid is:
18.Bernoulli's equation is written as:
19.The fundamental equation in fluid dynamics that relates to pressure, speed and height is:
20.A person standing near a fast moving train can fall:
21.The pressure of liquid is high where its speed is:
22.A chimney works best when it is:
23.The unit of 1/2 ρv^2 in Bernoulli's equation is same as that of:
Terminal velocity
24.Maximum and constant velocity of an object falling vertically downward in a fluid is:
25.When weight and drag force become equal then velocity of the body is:
26.Fog droplet fall down with terminal velocity its acceleration will be:
27.If the radius of droplet becomes half, then its terminal velocity will be:
Classification of solids
28.A solid in which atoms are in a regular order is called:
29.Which of the following is a crystalline solid?
30.Which of the following is polymeric solid?
31.A solid in which there is no regular arrangement of molecules is called:
Elastic constant
32.When stress changes the shape then it is called:
33.The S.I Unit of Modulus of elasticity is:
34.Young's Modulus is given by:
35.The ratio of stress to volumetric strain is called:
Terms of mechanical properties
36.The ability of a body to return to its original shape is called:
37.The deformation of body is the change in its:
38.The strain due to tensile stress is:
39.When stress changes the length of a body it is called:
40.The S.I Unit of Modulus of elasticity is:
41.The dimension of strain is:
42.When stress is increased beyond elastic limit and material is permanently changed this property is:
43.The maximum stress that a body can tolerate is called:
44.Value of stress beyond which body is permanently deformed is called:
Applications of Bernoulli's equation
45.The speed of efflux is measured by the relation:
46.Speed of fluid flow is measured by:
47.The mathematical relation, v = √(2g(h₁ - h₂)) is known as:
48.Venturimeter is used to measure:
49.The effect of decrease in pressure with increase in speed of fluid is:
- a Venturi effect
- b Torricelli effect
- c Photoelectric effect
- d Bernoulli's effect
50.A 10m high tank is full of water. A hole appear at its middle the speed will be:
Brittle substance
51.The substance which undergo plastic deformation until break is:
- a Brittle
- b Ductile
- c Hard
- d Soft
Atmospheric pressure
52.The pressure exerted by a column of mercury 76cm high and at 0°C is called:
Stok's law
53.The Stokes' law holds for:
54.The equation F =6πηrv is called:
Flowrate
55.The SI unit of flow rate is:
Laminar flow
56.The smooth or steady flow of fluid is called:
57.Steam line flow is also called:
Non-viscus fluid
58.An incompressible fluid having no viscosity is called:
Turbulent flow
59.The unsteady flow of fluid is called:
Fluid
60.The fluid is said to be incompressible, if its density is: