## Theory of Structures MCQ Practice Questions (Civil Eng) Set 6

##### The assumption in the theory of bending of beams, is:

Options are :

• Young's modulus is same in tension as well as in compression
• Each layer is independent to expand or to contract
• Material is isotropic
• Material is homogeneous
• All the above

##### In the truss shown in the given figure, the force in member BC is:Larger image

Options are :

• Zero
• 100 t compressive
• Indeterminate
• 100 t tensile

##### Stress may be defined as:

Options are :

• Force per unit volume
• Force per unit length
• None of these
• Force per unit area

##### The force in BF of the truss shown in given figure, is:Larger image

Options are :

• 4.5t tension
• 4t compression
• Zero
• 4.5t compression
• 4t tension

Options are :

• B
• C
• A
• D

Options are :

• D
• C
• B
• A

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

Options are :

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

Options are :

• 6.0 mm
• 5.5 mm
• 5.0 mm
• 4.5 mm
• 4.0 mm

##### A truss containing j joints and m members, will be a simple truss if:

Options are :

• j = 2m - 3
• j = 3m - 2
• m = 3j - 2
• m = 2j - 3

Answer :m = 2j - 3

Options are :

• 35 N
• 30 N
• 25 N
• 40 N

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

Options are :

• Tcp = ?m^(2) + T^(2) where letters carry their usual meanings
• Mcg = (M ?M^(2) + r^(2)) where letters carry their usual meanings
• The bending moment which when acting alone would produce the maximum stress equal to the major principal stress caused by combined bending and torsion, is called equivalent bending moment
• The torque which when acting alone would produce maximum shear stress equal to the maximum shear stress caused by the combined bending and torsion, is called equivalent torque
• All the above

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

Options are :

• The point of intersection of the bending axis with the cross section of the beam, is called shear centre
• All the above
• Bending loads should pass through the shear centre to avoid twisting
• For channels, the shear centre does not concide its centroid
• For I sections, the shear centre coincides with the centroid of the cross section of the beam

Options are :

• B
• A
• D
• C

Options are :

• D
• B
• C
• A

##### There are two hinged semicircular arches A, B and C of radii 5 m, 7.5 m and 10 m respectively and each carries a concentrated load W at their crowns. The horizontal thrust at their supports will be in the ratio of:

Options are :

• 1 : 1 1/2 : 2
• None of these
• 1 : 1 : 2
• 2 : 1 1/2 : 1

Answer :1 : 1 : 2

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

Options are :

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

Options are :

• B
• D
• A
• C
• E

##### A material is said to be perfectly elastic if:

Options are :

• It regains its original shape on removal of the load
• It does not regain its original shape at all
• None of these
• It regains its original shape partially on removal of the load

Options are :

• B
• C
• A
• D

Options are :

• B
• C
• D
• A

##### The point of contraflexure is the point where:

Options are :

• B.M. is minimum
• B.M. is maximum
• S.F. is zero
• B.M. changes sign

##### Total strain energy theory for the failure of a material at elastic limit, is known:

Options are :

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

Options are :

• A
• E
• C
• D
• B

Options are :

• A
• C
• D
• B

Options are :

• A
• C
• D
• B

Options are :

• 2 cm
• 1 cm
• 2.5 cm
• 1.5 cm

Options are :

• 14 m
• 16 m
• 12 m
• 18 m
• 10 m

Options are :

• A
• B
• D
• C

Options are :

• D
• B
• C
• A

Options are :

• tan ?
• sin ? cos ?
• sin ?
• sin^(2)?
• cos ?