MCQ
41. The Newton's law of resistance is based on the assumption that the--
Planes of the body are completely smooth
Space around the body is completely filled with the fluid
Fluid particles do not exert any influence on one another
All of the above
42. কাঁচ তৈরির প্রধান উপাদান কোনটি?
সোডা
বালি
ম্যাগনেসিয়াম
সব গুলোই
43. A flow is called hyper-sonic, if the Mach number is---
Less than unity
Unity
Between 1 and 6
None of these
44. Gypsum is added in the manufacture of Portland cement in order to (পোর্টল্যান্ড সিমেন্ট জিপসাম যোগ করার কারণ)
shorten the setting time of cement
lengthen the setting time of cement
decrease the burning temperature
decrease the grinding time
45. Liquids---
Cannot be compressed
Occupy definite volume
Are not affected by change in pressure and temperature
None of the above
46. নিচের কোনটি পাতন করে তলানি হিসাবে পিচ পাওয়া যায়-
টার
অ্যাঙ্কান্ট
বিটুমিন
ইমালশন
47. An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is ---
10 m/sec^2
9.81 m/sec^2
9.75 m/sec^2
9 m/sec
48. When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of--
A triangle
A paraboloid
An ellipse
None of these
49. The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called---
Newton's law of motion
Newton's law of
Possess surface tension
all the above properties
50. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as--
Meta center
Center of pressure
Center of buoyancy
Center of gravity
51. The chief ingredient of a paint is --
alccohol
drier
oil
pigment
52. Fluid is a substance that---
Always expands until it fills any container
Has the same shear stress at a point regardless of its motion
Cannot remain at rest under action of any shear force
Cannot be subjected to shear forces
53. The solvent used in cement paint is (সিমেন্ট পেইন্ট ব্যবহৃত দ্রাবক)
trupentine
water
spirit
kerosene
54. নিচের কোনটি আরসিসি বিমের উপাদান নয়?
সিমেন্ট
খোয়া
বালি
সবগুলো
55. For manometer, a better liquid combination is one having---
Higher surface tension
Lower surface tension
Surface tension is no criterion
High density and viscosity
56. The flow in a pipe is neither laminar nor turbulent when Reynold number is-
Less than 2000
Between 2000 and 2800
More than 2800
None of these
57. A fluid in equilibrium can't sustain--
Tensile stress
Compressive stress
Shear stress
Bending stress
58. The tendency of a liquid surface to contract is due to the following property-
Cohesion
Adhesion
Viscosity
Surface tension
59. When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure that if the same plate is immersed perpendicular to the rоw?
Less than
More than
Equal to
None of these
60. The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is--
200 kg/m3
400 kg/m3
600 kg/m3
800 kg/m3