# Theory of Structures MCQ Civil Engineering

50 Questions 30 Mins

Following are some of the multiple choice questions on the Theory of Structures with answers that will help the students in developing their knowledge.

## Theory of Structures MCQ

• Strain
• Stress
• Bulk modulus
• Elasticity

• N/m2
• Nm
• N/m
• Nm2

### 3. The ratio of stress and strain is known as

• Modulus of elasticity
• Young's modulus
• Both a. and b.
• None of the above

• Elasticity
• Creep
• Plasticity
• Brittle

### 5. The limit beyond which the material does not behave elastically is known as

• Proportional limit
• Elastic limit
• Plastic limit
• Yield point

### 6. When tensile stress is applied axially on a circular rod its

• diameter decreases and length increases
• diameter decreases
• length increases

• Elongation
• Distortion
• Deformation
• Displacement

### 8. Flat spiral springs

• Consist of uniform thin strips
• Are supported at outer end
• Are wound by applying a torque
• All the above

• 1.10 to 1.20
• 1.20 to 1.30
• 1.30 to 1.40
• 1.40 to 1.50

### 10. Short column failure

• Crushing failure
• Buckling failure

### 11. A close coil helical spring when subjected to a moment M having its axis along the axis of the helix

• It is subjected to pure bending
• Its mean diameter will decrease
• Its number of coils will increase
• All the above

### 12. Maximum principal stress theory for the failure of a material at elastic point, is known

• Guest's or Trecas' theory
• St. Venant's theory
• Rankine's theory
• Von Mises' theory

• One way slab
• Two way slab
• Flat slab
• Waffle slab

• Short column
• Long column

• Short column
• Long column

### 16. The free-body diagram of any joint is a concurrent force system in which the summation of moment will be of no help.

• Effective length of column
• Method of joints
• Method of sections

### 17. In this method, we cut the truss into two sections by passing a cutting plane through the members whose internal forces we wish to determine.

• Effective length of column
• Method of joints
• Method of sections

• 2/3
• 3/2
• 5/8
• 8/5

### 19. Y are the bending moment, moment of inertia, radius of curvature, modulus of If M, I, R, E, F, and elasticity stress and the depth of the neutral axis at section, then

• M/I = R/E = F/Y
• I/M = R/E = F/Y
• M/I = E/R = F/Y
• M/I = E/R = Y/F

• M/T
• T/M
• 2M/ T
• 2T/M

• 75 N/m²
• 750 N/m²
• 7500 N/m²
• 75000 N/m²

• 1/8
• 1/10
• 1/12
• 1/16

• 1/2
• 2/3
• 1/4
• 1/3

• 1/8
• 1/4
• 1/2
• 1/3

• el/2d
• e²l/3d²
• el²/3d²
• e²l²/3d²

### 26. Shear strain energy theory for the failure of a material at elastic limit, is due to

• Rankine
• Guest or Trecas
• St. Venant
• Von Mises

• F/A
• F/2A
• 3F/2A
• 2F/3A

• 200 mm
• 250 mm
• 300 mm
• 400 mm

• 2/3
• 3/2
• 8/5
• 5/8

### 30. A compound truss may be formed by connecting two simple rigid frames, by

• Two bars
• Three bars
• Three parallel bars
• Three bars intersecting at a point

### 31. If a three hinged parabolic arch, (span l, rise h) is carrying a uniformly distributed load w/unit length over the entire span,

• Horizontal thrust is wl2/8h
• S.F. will be zero throughout
• M. will be zero throughout
• All the above

### 32. Constant, depth of a cantilever of length of uniform strength loaded with Keeping breadth uniformly distributed load varies from zero at the free end and

• 2w w l at the fixed end
• l) at the fixed end
• w l) at the fixed end
• 3w l at the fixed end

• ML/EI
• ML/2EI
• ML²/2EI
• ML²/3EI

• 2 mm
• 3 mm
• 4 mm
• 5 mm

### 35. In the truss, the force in the member AC is

• 6.25 t compressive
• 8.75 t tensile
• t tensile
• t compressive

• 264 MN
• 274 MN
• 284 MN
• 294 MN

### 37. Slenderness ratio of a long column, is

• Area of cross-section divided by radius of gyration
• Area of cross-section divided by least radius of gyration
• Radius of gyration divided by area of cross-section
• Length of column divided by least radius of gyration

• 4
• 8
• 12
• 16

• m = 2j – 3
• j = 2m – 3
• m = 3j – 2
• j = 3m – 2

• Depth d M
• Depth d 3
• Depth d
• Depth d 1/M

### 41. The ratio of lateral strain to axial strain of a homogeneous material, is known

• Yield ratio
• Hooke’s ratio
• Poisson’s ratio
• Plastic ratio

• 80 N/mm²
• 100 N/mm 2
• 120 N/mm²
• 150 N/mm²

• 411 N mm
• 511 N mm
• 611 N mm
• 711 N mm

### 44. A compound bar consists of two bars of equal length. Steel bar cross -section is 3500 mm²and that of brass bar is 3000 mm². These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm² and Eb = 0.1 MN/mm², the stresses developed are:

• b = 10 N/mm² s = 20 N/mm 2
• b = 8 N/mm² s = 16 N/mm²
• b = 6 N/mm² s = 12 N/mm²
• b = 5 N/mm² s = 10 N/mm²

### 45. A composite beam is composed of two equal strips one of brass and other of steel. If the temperature is raised

• Steel experiences tensile force
• Brass experiences compressive force
• Composite beam gets subjected to a couple
• All the above

• Width b M
• Width b M
• Width b 3 M
• Width b 1/M

• 4.0 mm
• 4.5 mm
• 5.0 mm
• 5.5 mm

### 48. At yield point of a test piece, the material

• Obeys Hooke’s law
• Behaves in an elastic manner
• Regains its original shape on removal of the load
• Undergoes plastic deformation

### 49. Beams composed of more than one material, rigidly connected together so as to behave as one piece, are known as

• Compound beams
• Indeterminate beams
• Determinate beams
• Composite beams

### 50. For calculating the allowable stress of long columns σ0 = σy/n [1 - a (1/r)²]is the empirical formula, known as

• Straight line formula
• Parabolic formula
• Perry
• Rankine