Strength of materials mcq are given below : ##### Q1. Hooke’s law holds good up to

(a) yield point

(b) limit of proportionality

(c) elastic limit

(d) breaking point

Ans: (b) limit of proportionality

##### Q2. Young’s modulus is defined as the ratio of

(a) volumetric stress and volumetric strain

(b) lateral stress and lateral strain

(c) longitudinal stress and longitudinal strain

(d) shear stress to shear strain

Ans: (c) longitudinal stress and longitudinal strain

##### Q3. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called

(a) internal resistance

(b) tensile stress

(c) transverse stress

(d) compressive stress

Ans:(b) tensile stress

##### Q4. If the radius of wire stretched by a load is doubled, then its Young’s modulus will be

(a) doubled

(b) halved

(c) become four times

(d) remain unaffected.

Ans: remain unaffected.

##### Q5. The Young’s modulus of a wire is defined as the stress which will increase the length of wire compared to its original length

(a) half

(b) same amount

(c) double

(d) one-fourth

Ans: (b) same amount

##### Q6. The strain energy stored in a solid circular shaft subjected to shear stress (η), is:

(Where G = Modulus of rigidity for the shaft material)
(a) η²/ 2G × Volume of shaft
(b) η/ 2G × Volume of shaft
(c) η²/ 4G × Volume of shaft
(d) η/ 4G × Volume of shaft

Ans: (a) η²/ 2G × Volume of shaft

##### Q7. Principal planes are planes having

(a) Maximum shear stress
(b) No shear stress
(c) Minimum shear stress
(d) None of the above

Ans: (b) No shear stress
(Principal planes are the plane where shear stress do not exist, i.e. shear stress is zero)

##### Q8. The torque transmitted by a hollow shaft of outer diameter (d₁) and inner diameter (d2) is

(where η = Maximum allowable shear stress)
(a) π/4 × η × (d41- d4 2)/d1
(b) π/16 × η × (d41- d4 2)/d1
(c) π/32 × η × (d41- d4 2)/d1
(d) π/64 × η × (d41- d4 2)/d1

Ans: (b) π/16 × η × (d41- d4 2)/d1

##### Q9. A composite bar made up of steel and copper bars of equal lengths are heated through 100°C. The stresses developed shall be

(a) Tensile in both the material
(b) Tensile in steel and compressive in copper
(c) Compressive in steel and tensile in copper
(d) Compressive in both the materials

Ans: (d) Compressive in both the materials

##### Q10. If Kh is the torque resisting capacity of a hollow shaft and Ks is that of a solid shaft, of the same material, length and weight. Then,

(a) Kh > Ks
(b) Kh < Ks
(c) Kh = Ks
(d) None of these

Ans: (a) Kh > Ks

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 Strength of Material MCQ Section-1 Section-2 Section-3 Section-4 Section-5 Section-6