171. According to Unwin’s formula, the relation between diameter of rivet hole (d) and thickness of plate (t) is given by (where d and t are in mm)
d = t
d = 1.6 t
d = 2t
d = 6 t
✅ The correct answer is option D.
Strength of Materials MCQs
172. The radius of the Mohr ‘s circle in the given figure is equal to
sum of two principal stresses
difference of two principal stresses
half the sum of two principal stresses
half the difference of
✅ The correct answer is option D.
173. On one side of a neutral axis of a beam, there is a tensile stress and on the other side of the beam there is a compressive stress.
Agree
Disagree
✅ The correct answer is option A.
174. The direct stress induced in a long column is __________ as compared to bending stress.
same
more
less
negligible
✅ The correct answer is option D.
175. A section of beam is said to be in pure bending, if it is subjected to
constant bending moment and constant shear force
constant shear force and zero bending moment
constant bending moment and zero shear force
none of the above
✅ The correct answer is option C.
176. A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum normal stress will be
-100 MPa
250 MPa
300 MPa
400 MPa
✅ The correct answer is option D.
177. The factor of safety is always more than unity.
Correct
Incorrect
✅ The correct answer is option A.
178. If the modulus of elasticity of a material is twice its modulus of rigidity, then the Poisson’s ratio of the material is equal to zero.
Correct
Incorrect
✅ The correct answer is option A.
179. The section modulus of a rectangular section about an axis through its C.G., is
b/2
d/2
bd2/2
bd2/6
✅ The correct answer is option D.