MCQ
1101. A flow is called hyper-sonic, if the Mach number is---
Less than unity
Unity
Between 1 and 6
None of these
1102. An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called--
Weir
Notch
Orifice
None of these
1103. 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
1104. 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
1105. A fluid in equilibrium can't sustain--
Tensile stress
Compressive stress
Shear stress
Bending stress
1106. বেজিনের সূত্রের সাহায্যে নির্গমনের সূত্র-
Ac√mi
Ac√m/i
Ac√m
Ac√m/c
1107. 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
1108. Liquids---
Cannot be compressed
Occupy definite volume
Are not affected by change in pressure and temperature
None of the above
1109. According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)--
A x M x m 1/2 × i2/3
A x M x m 2/3 × il/2
A I/2 x M 2/3 x m x i
A 2/3 x M I/3 x m x i
1110. Coefficient of velocity is defined as the ratio of--
Actual velocity of jet at vena contracta to the theoretical velocity
Area of jet at vena contracta to the area of orifice
Actual discharge through an orifice to the theoretical discharge
None of the above
1111. 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
1112. cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be--
Higher than the surface of liquid
The same as the surface of liquid
Lower than the surface of liquid
Unpredictable
1113. নালা প্রধানত নিম্নের প্রকারের-
1
3
2
4
1114. The chief ingredient of a paint is --
alccohol
drier
oil
pigment
ব্যাখ্যা: Explained: Pigment কাঙ্খিত বর্ণ প্রদান করে। তাই রং এর প্রধান উপাদান Pigment
1115. 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
ব্যাখ্যা: Explained: জিপসাম সিমেন্টের জমাট বাধার সময় নিয়ন্ত্রন করে।জিপসাম সিমেন্টের Flash setting সেটিং এ্যাকশন এর গতিকে রোধ করে সেটিং টাইম বৃদ্ধি করে। জিপসাম সিমেন্টের রোধ করে।
1116. The ratio of the inertia force to the called Euler's number is--
Pressure force
Elastic force
Surface tension force
Viscous force
1117. The solvent used in cement paint is (সিমেন্ট পেইন্ট ব্যবহৃত দ্রাবক)
trupentine
water
spirit
kerosene
ব্যাখ্যা: Explained: ম্যাশনারি পৃষ্ঠ সিমেন্ট পেইন্ট প্রয়োগ করার আগে দ্রাবক হিসাবে পানি যোগ করা হয়।
1118. A one dimensional flow is one which--
Is uniform flow
Is steady uniform flow
Takes place in straight lines
Involves zero transverse
1119. নিম্নের কোনটি কৃত্রিম নালা-
খাল
নদী
নর্দমা
সব কয়টি
1120. The property of fluid by virtue of which it offers resistance to shear is called-
Surface tension
Adhesion
Cohesion
Viscosity