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MCQ
4721. কোনো material- এর tensile test থেকে যে percentage of elongation পাওয়া যায় তা ঐ material- এর কোন গুণটি নির্দেশ করে?
Ductility
Plasticity
Resilience
Elasticity
4722. The shear modulus of most materials with respect to the modulus of elasticity is-
equal to half
less than half
more than half
none of these
Explained-It is true that many materials have the shear modulus is nearly half of elastic one. So the shear modulus of elastcity is less than half.
4723. The ultimate tensile stress for mild steel is....... the ultimate compressive stress.
equal to
less than
more than
none of these
Explained: The ultimate tensile stress of mild steel 15 more than the ultimate compressive stress. Yong modulus of a wire will be equal to stress for unit strain.
4724. The neutral axis of the cross-section of a beam is that axis at which the bending stress is-
zero
minimum
maximum
infinity
Explained: There is no load acting on neutral axis so bending stress on the neutral axis is zero, but shear stress are maximum at neutral axis.
4725. If twe forces of 3kg and 4kg act at right angle to each other, their resultant force will be-
5kg
1kg
14kg
7 kg
4726. The stress developed in the material without any permanent set is called-
elastic limit
yield point
ultimate point
breaking point
Explained:-Elastic limit, maximum stress or force per unit area within a solid material that can arise before the onset of permanent deformation. When stress up to the elastic limit are removed, the material resumes its original size and shape.
4727. [100 mm² ক্ষেত্রফলের উপর 100 N বল প্রয়োগ করলে সঠিক পীড়ন কত হবে?)
0.1 MPa
0.01 MPa
1 MPa
1 Kpa
4728. The ration of linear stress to the linear strain is called-
modulus of rigidity
modulus of elastisity
bulk moduius
poisson is ration
Explained:-young modulus of elasticity of a material is the ration of longitudinal stress to the strain of some material. Bulk modulus of elasticity is the ration of hydrostatic stress to volumetric strain. K Y or here, K= Bulk modulus, Y = 3(1-20)3(m-2) young'smodulus, o Possion'sration
4729. A welded joint as compared to a riveted joint has............. strength.
same
more
less
four times
Explained:-Welded joint provides greater strength, Riveted joint lesser strength as compare to riveted strength. Riveted joints are generally heavier than welded joints.
4730. The elongation of a rod under tensile test indicates --
Ultimate strength
Yieldstrength
Ductility
Breaking strength.
4731. Mild steel- এর Poisson's ratio-এর Range কত?
০.৩০-০.৩১
০.১০-০.২০
০.২৯-০.২৬
০.২৭-০.৩০
Explained: Mild steel- এর poisson's ratio- (০.২৭-০.৩০) Stainless steel- (০.৩০-০.৩১) Concrete- (০১-০.২)
4732. তলের সমান্তরালে একক ক্ষেত্রফলের উপর প্রতিরোধী বলকে--- বলা হয়।
Bending stress
Axial stress
Torsional stress
Shear stress
4733. In the Eulers formula the value of C for a column, One and fixed and other end free, is--
0.5
2
1
4
Explained:-In the Euler's formula, the value of c for a column with one end fixed and the other and hinged, is or .5
4734. The slope of stress-strain curve in the elastic deformation region is car --
elastic modulus
plastic modulus
poison's ratio
none of the above
Explaineilis কোন পদার্থের পার্শ্ব বিকৃতি ও দৈর্ঘ্য বিকৃতির অনুপাতকে পয়সন রেশিও বলে।
4735. Beam এর Inflection point এ বোল্ডিং মোমেন্ট কত?
শূন্য
সর্বোচ্চ
সর্বনিম্ন
কোনোটি নয়
Explained:-Inflection point বেন্ডিং মোমেন্ট ডায়াগ্রামের যে বিন্দুতে বেন্ডিং মোমেন্ট চিহ্ন পরিবর্তন করে তাকে ইনফ্লেকশন পোয়েন্ট বলে।
4736. The neutral axis of a beam is subjected to........
zero
minimum
maximum tensilie
maximum
Explained-There is no load acting on neutral axis so bending stress on the neutral axis is zero, but shear stress are maximum at neutral axis.
4737. The energy stored in a body wen strained within elastic limit is known as-
resilience
proof resilience
strain energy
impact energy
Explained:-The energy stored in a body when strained with in elastic limie is known as strain enery,. The maximum strain enery which can be stored in a body is termed as proof resilience. The proof resilience per unit volume of a material is known as modulus of resilience.
4738. কোনটি Steel Truss এর member না -
Kingpost
Lintel
Rafter
Purline
Explained:- Lintel হলো দরজা/জানালার উপরে দেয়া অনুভূমিক সাপোর্ট। যা steel truss- এর অন্তর্ভুক্ত নয়।
4739. Modulus of rigidity is the ration of - (মডুলাস অব রিজিডিটির অনুপাত হল-)
Normal stress to normal strain
Shear stress to shear strain
Lateral stress to lateral strain
None of the above.
4740. The modulus of elasticity for mild steel is approximately equal to--
10 kN/mm2
80 kN/mm2
100 kN/mm2
210 kN/mm2
Explained:-The modulus of elasticity for mild steel is 210 kN/mm², cast iron 110 kN/mm² and copper 120 kN/mm²