   ## Theory of Structures MCQ Practice Questions (Civil Eng) Set 1

##### Pick up the correct statement from the following:

Options are :

• The planes of principal stresses are inclined at 45° to the neutral plane
• The bending stress in a section is zero at its neutral axis and maximum at the outer fibres
• The bending stress at the outer fibres, is known as principal stress
• The shear stress is zero at the outer fibres and maximum at the neutral axis
• All the above

##### The locus of reaction of a two hinged semi-circular arch, is:

Options are :

• Circle
• Parabola
• Straight line
• Hyperbola

Options are :

• 2 mm
• 3 mm
• 5 mm
• 4 mm
• 6 mm

Options are :

• C
• D
• A
• B

Options are :

• 200 mm
• 250 mm
• 400 mm
• 300 mm
• 350 mm

Options are :

• C
• A
• D
• E
• B

Options are :

• B
• C
• D
• A

Options are :

• B
• C
• D
• A

##### The greatest load which a spring can carry without getting permanently distorted, is called:

Options are :

• Proof stress
• Prof resilience
• Stiffness

Options are :

• 2.125 cm^(3)
• 3.125 cm^(3)
• 1.125 cm^(3)
• 4.125 cm^(2)

Options are :

• 3.0
• 1.5
• 2.5
• 2.0
• 1.0

Options are :

• A
• B
• C
• D

##### The S.F. diagram of a loaded beam shown in the given figure is that of Larger image Options are :

• A cantilever with a uniformly distributed load
• A simply supported beam with uniformly distributed load
• A simply supported beam with isolated central load
• A cantilever with an isolated load at the free end

Options are :

• A
• D
• C
• B

##### The forces in the members of simple trusses, may be analysed by:

Options are :

• Method of joints
• Method of sections
• Graphical method
• All the above

##### Larger image is the equation of Euler's crippling load, if:

Options are :

• One end is fixed and other end is free
• Both the ends are fixed
• Both the ends are hinged
• One end is fixed and other end is hinged

Answer :One end is fixed and other end is free

##### The yield moment of a cross section is defined as the moment that will just produce the yield stress in:

Options are :

• The outer most fibre of the section
• The inner most fibre of the section
• The fibre everywhere
• The neutral fibre of the section

Answer :The outer most fibre of the section

##### Flat spiral springs:

Options are :

• All the above
• Consist of uniform thin strips
• Are used in clock-work mechanism
• Are wound by applying a torque
• Are supported at outer end

Options are :

• A
• C
• D
• B

##### A compound bar consists of two bars of equal length. Steel bar cross-section is 3500 mm^(2) and that of brass bar is 3000 mm^(2). These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm^(2) and Eb = 0.1 MN/mm^(2), the stresses developed are:

Options are :

• ?b = 8 N/mm^(2), ?s = 16 N/mm^(2)
• ?b = 6 N/mm^(2), ?s = 12 N/mm^(2)
• ?b = 10 N/mm^(2), ?s = 20 N/mm^(2)
• ?b = 5 N/mm^(2), ?s = 10 N/mm^(2)

Answer :?b = 10 N/mm^(2), ?s = 20 N/mm^(2)

##### Pick up the correct statement from the following:

Options are :

• For a uniformly distributed load, the shear force varies linearly
• For a uniformly distributed load, B.M. curve is a parabola
• For a load varying linearly, the shear force curve is a parabola
• For a load varying linearly, the B.M. curve is a cubic parabola
• All the above

##### The ratio of shear stress and shear strain of an elastic material, is:

Options are :

• None of these
• Modulus of Rigidity
• Young's Modulus
• Shear Modulus
• Modulus of Elasticity

Answer :Modulus of Rigidity Shear Modulus

Options are :

• 0.0025
• 0.003
• 0.005
• 0.002
• 0.001

Options are :

• E
• A
• B
• D
• C

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

Options are :

• Horizontal thrust is wl^(2)/8h
• S.F. will be zero throughout
• All the above
• B.M. will be zero throughout

Options are :

• D
• A
• C
• B

Options are :

• D
• B
• A
• C

Options are :

• B
• C
• D
• A

Options are :

• 100 N/mm^(2)
• 150 N/mm^(2)
• 80 N/mm^(2)
• 120 N/mm^(2)

Options are :

• A
• C
• D
• B