   ## Theory of Structures MCQ Practice Questions (Civil Eng) Set 3

##### The forces acting normally on the cross section of a bar shown in the given figure introduce: Larger image Options are :

• Tensile stress
• None of these
• Shear stress
• Compressive stress

##### At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by:

Options are :

• None of these
• Maximum compressive stress at the section
• Maximum tensile stress at the section
• Depth of the section
• Depth of the neutral axis

Answer :Depth of the neutral axis

Options are :

• A
• D
• C
• B

Options are :

• A
• D
• C
• B

##### The locus of the moment of inertia about inclined axes to the principal axis, is:

Options are :

• Circle
• Straight line
• Ellipse
• Parabola

##### m1 and m2 are the members of two individual simple trusses of a compound truss. The compound truss will be rigid and determinate if:

Options are :

• m = m1 + m2 + 3
• m = m1 + m2 + 1
• m = m1 + m2
• m = m1 + m2 + 2

Answer :m = m1 + m2 + 3

##### The load on a spring per unit deflection, is called:

Options are :

• Proof stress
• Proof resilience
• Stiffness

Options are :

• D
• B
• C
• A

Options are :

• B
• A
• C
• D

Options are :

• D
• C
• B
• A

Options are :

• E
• D
• B
• C
• A

Options are :

• B
• D
• A
• C

##### The locus of the end point of the resultant of the normal and tangential components of the stress on an inclined plane, is:

Options are :

• Parabola
• Ellipse
• Circle
• Straight line

Options are :

• C
• A
• B
• D
• E

Options are :

• 0.707
• 0.505
• 0.606
• 0.404
• 0.303

##### In case of principal axes of a section:

Options are :

• Product of moment of inertia is zero
• Difference of moment inertia is zero
• Sum of moment of inertia is zero
• None of these

Answer :Product of moment of inertia is zero

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

Options are :

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

Options are :

• A
• C
• E
• D
• B

Options are :

• C
• B
• A
• D

##### For calculating the permissible stress Larger image is the emprical formula, known as:

Options are :

• Straight line formula
• Perry's formula
• Parabolic formula
• Rankine's formula

Options are :

• B
• A
• D
• C

Options are :

• A
• D
• C
• B

##### Slenderness ratio of a long column, is:

Options are :

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

Options are :

• A
• B
• D
• C

Options are :

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

Options are :

• A
• D
• C
• B

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

Options are :

• The moment of inertia is calculated about the axis about which bending takes place
• If tensile stress is more than axial stress, some portion of the section experiences a tensile stress
• If tensile stress is equal to axial stress, the section experiences compressive stress
• All the above
• If tensile stress is less than axial stress, the section experiences compressive stress

##### If a concrete column 200 x 200 mm in cross-section is reinforced with four steel bars of 1200 mm^(2) total cross-sectional areaCalculate the safe load for the column if permissible stress in concrete is 5 N/mm^(2) and Es is 15 Ec:

Options are :

• 284 MN
• None of these
• 294 MN
• 264 MN
• 274 MN

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

Options are :

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

Answer :It is subjected to pure bending

##### In the truss shown in given figure, the force in member BD is: Larger image Options are :

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