### Structural Mechanics Set 4

This set of Structural Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Structural Mechanics Set 4

Q1 | The total strain energy stored in a body is termed as
• resilience
• proof resilience
• modulus of resilience
• toughness
Q2 | Proof resilience per material is known as
• resilience
• proof resilience
• modulus of resilience
• toughness
Q3 | The stress induced in a body due to suddenly applied load compared to when it is applied gradually is
• same
• half
• two times
• four times
Q4 | strain energy stored in a body due to suddenly applied load compared towhen it is applied gradually is
• same
• twice
• four times
• eight times
Q5 | During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is
• 4 tonnes/cm2
• 8 tonnes/cm2
• 16 tonnes/cm2
• 22 tonnes/cm2
Q6 | Tensile strength of a material is obtained by dividing the maximum loadduring the test by the
• area at the time of fracture
• original cross-sectional area
• average of (a) and (b)
• minimum area after fracture
Q7 | An axial pull of 50 KN is suddenly applied to a steel bar 2 m long and 1000 mm2 in cross-section. If modulus of elasticity is 200 GPa, find strain energy stored in the bar
• 10,000 N.mm
• 20,000 N.mm
• 25,000 N.mm
• 50,000 N.mm
Q8 | A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm2, the area of steel required, is
• 14 cm2
• 15 cm2
• 16 cm2
• 17 cm2
Q9 | A 10 m long mild steel rail section is fixed at 300 K temperature. If temperature increases by 60 K, find stress in rail section if ends are not yielded. Coefficient of thermal expansion is 12×10-6/K.
• 72 N/mm2
• 144 N/mm2
• 120 N/mm2
• 240 N/mm2
Q10 | The ultimate shear stress of a mild steel plate of 10 mm thickness is 350 N/mm2. Calculate the diameter of the hole that can be punched to it without exceeding a compressive stress of 700 N/mm2.
• 10 mm
• 20 mm
• 7 mm
• 35 mm
Q11 | A bar 2 m long and 20 mm diameter is subjected to an axial pull of 125.6 KN. Due to this load, length increases by 4 mm and diameter reduce by 0.012 mm. Find Poison?s ratio.
• 0.2
• 0.25
• 0.3
• 0.35
Q12 | A composite section of R.C.C. column 300mm×300mm in section having 20mm diameter 4 bars, one at each corner. Strength of concrete is 5 N/mm2 and modular ratio Es/Ec=9. Calculate load taken by column.
• 150 KN
• 200 KN
• 400 KN
• 500 KN
Q13 | The moment of inertia of a triangular section of base 3 unit and height 2 unit, about an axis passing through its base is .
• 6
• 9
• 8
• 2
Q14 | Moment of inertia of a square of side 1 unit about an axis through its center of gravity, is .
• 1
• 12-Jan
• 03-Jan
• 04-Jan
Q15 | The axis about which moment of area is taken is known as .
• Axis of area
• Axis of moment
• Axis of reference
• Axis of rotation
Q16 | What is the formula of theorem of parallel axis?
• Iab = Ig + ah
• Iab = ah2 + Ig
• Iab = Ig – ah2
• Izz = Iyy + Ixx
Q17 | Moment of inertia of a circular section of 2 cm diameter, about an axis through its centre of gravity, is .
• ?/64
• ?/4
• ?/16
• ?/2
Q18 | What is the unit of section modulus?
• mm
• mm2
• mm3
• mm4
Q19 | What is the formula of theorem of perpendicular axis?
• Izz = Ixx – Iyy
• Izz = Ixx + Ah2
• Izz – Ixx = Iyy
• None of the above
Q20 | What is the unit of moment of inertia?
• mm
• mm2
• mm3
• mm4
Q21 | What is the unit of Radius of gyration?
• mm
• mm2
• mm3
• mm4
Q22 | What is the formula of radius of gyration?
• k2 = I/A
• k2 = I2/A
• k2 = I2/A2
• k2 = (I/A)1/2
Q23 | What will be the radius of gyration of a circular plate of diameter 10cm?
• 1.5cm
• 2.0cm
• 2.5cm
• 3.0cm
Q24 | Moment of inertia of any section about an axis passing through its C.G is
• Maximum
• Minimum
• Depends upon the dimensions of the section
• Depends upon the shape of the section
Q25 | The moment of inertia of a triangular section of base „b? and height „h? about an axis passing through its base is ……. times the moment of inertia about an axis passing through its C.G. and parallel to the base
• 9
• 4
• 2
• 3