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MCQ
1561. 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
1562. The elongation of a rod under tensile test indicates --
Ultimate strength
Yieldstrength
Ductility
Breaking strength.
1563. 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.
1564. Resisting force per unit area parallel to plane called --
Bending stress
Axial stress
Torsional stress
Shear stress
1565. 100 N force is applied on an area 1000 mm². Choose the correct stress.
0.1 MPa
0.01 MPa
1 MPa
1 Kpa
1566. 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
1567. The factor of safety due to sliding for the retaining wall is generally taken as-
1
1.5
2
4
Explained:-The factor of safety against sliding is defined as force preventing sliding along the bottom divided by the force that will cause sliding along the bottom surface. Factor of safety should not be less than 1.5 for sliding condition.
1568. তলের সমান্তরালে একক ক্ষেত্রফলের উপর প্রতিরোধী বলকে--- বলা হয়।
Bending stress
Axial stress
Torsional stress
Shear stress
1569. 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.
1570. 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.
1571. 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।
1572. 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.
1573. 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.
1574. [100 mm² ক্ষেত্রফলের উপর 100 N বল প্রয়োগ করলে সঠিক পীড়ন কত হবে?)
0.1 MPa
0.01 MPa
1 MPa
1 Kpa
1575. 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.
1576. 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.
1577. 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.
1578. 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
1579. 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)
1580. The bending strees in a beam at neutral axis is-
zero
minimum
maximum
none of these
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