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MCQ
41. 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.
42. তলের সমান্তরালে একক ক্ষেত্রফলের উপর প্রতিরোধী বলকে--- বলা হয়।
Bending stress
Axial stress
Torsional stress
Shear stress
43. বেন্ডিং মোমেন্ট ডায়াগ্রামের হেলানো সরল রেখা নিচের কোনটি নির্দেশ করে?
শূন্য লোড
হেলানো লোড
কাপল লোড
সেন্ট্রাল লোড
Explained:- মসৃণ বক্ররেখা সমভাবে বিস্তৃত লোড নির্দেশ করে। পরিবর্তনশীল বক্ররেখা ত্রিভুজাকার লোড নির্দেশ করে আর উল্লম্ব রেখা ও রেখার মান কাপল লোড নির্দেশ করে।
44. The elongation of a rod under tensile test indicates --
Ultimate strength
Yieldstrength
Ductility
Breaking strength.
45. 100 N force is applied on an area 1000 mm². Choose the correct stress.
0.1 MPa
0.01 MPa
1 MPa
1 Kpa
46. [100 mm² ক্ষেত্রফলের উপর 100 N বল প্রয়োগ করলে সঠিক পীড়ন কত হবে?)
0.1 MPa
0.01 MPa
1 MPa
1 Kpa
47. 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.
48. 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.
49. 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.
50. Resisting force per unit area is called ---
Strain (বিকৃতি)
Shear (করুন)
Moment (ভ্রামক)
Stress (পীড়ন)
51. 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.
52. 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.
53. Resisting force per unit area parallel to plane called --
Bending stress
Axial stress
Torsional stress
Shear stress
54. 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.
55. 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.
56. Pick up the correct statement from the following:
A wire wound in spiral form, is called a helical spring
The pitch of a close coil spring, is very small
The angle made by the coil with horizontal, is called the angle of helix
All the above
57. 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
58. Calculate the maximum deflection of a cantilever beam with UDL on entire span of 3 m. The intensity of UDL be 25kN/m. Take El as 4000 kN/m² --
0.052 m
0.076 m
0.063 m
0.069 m
59. বেন্ডিং মোমেন্ট ডায়াগ্রামের হেলানো সরল রেখা নিচের কোনটি নির্দেশ করে?
শূন্য লোড
হেলানো লোড
কাপল লোড
সেন্ট্রাল লোড
60. যে দেয়াল ভারাট মাটির পার্শ্বচাপ বহনের জন্য তৈরি করা হয় তাকে বলে-
Boundary wall
Vertical wall
Shear wall
Retaining wall