Structural Mechanics Set 2 MCQs

Q1 | Columns of given length, cross-section and material have different values of buckling loads for different end conditions. The strongest column is one whose

one end is fixed and other end is hinged

both ends are hinged or pin jointed

one end is fixed and the other end entirely free

both the ends are fixed

Q2 | The slenderness ratio of a vertical column of square cross- section of 10 cm side and 500 cm long, is

117.2

17.3

173.2

137.2

Q3 | The equivalent length of a column fixed at one end and free at the other end, is

0.5L

0.7L

L

2L

Q4 | The radius of gyration of a squar section is not proportional to

square root of the moment of inertia

square root of the inverse of the area

square root of the moment of inertia divided by area of the section

side of squar

Q5 | The length of a column, having a uniform circular cross-section of 7.5 cm diameter and whose ends are hinged, is 5 m. If the value of E for the material is 2100 kN/cm2, the permissible maximum crippling load will be

1.288 kN

12.88 kN

128.8 kN

288.0 kN

Q6 | A sudden increase or decrease in shear force diagram between any two points indicates that there is

No loading between the two points

Point loads between the two points

U.D.L. between the two points

None of these

Q7 | A beam is a structural member which is subjected to

Axial tension or compression

Transverse loads and couples

Twisting moment

No load, but its axis should be horizontal and x-section rectangular or circular

Q8 | Which of the following are statically determinate beams?

Only simply supported beams

Cantilever, overhanging and simply supported

Fixed beams

Continuous beams

Q9 | A cantilever is a beam whose

Both ends are supported either on rollers or hinges

One end is fixed and other end is free

Both ends are fixed

Whose both or one of the end has overhang

Q10 | In a cantilever carrying a uniformly varying load starting from zero at the free end, the shear force diagram is

A horizontal line parallel to x-axis

A line inclined to x-axis

Follows a parabolic law

Follows a cubic law

Q11 | In a cantilever carrying a uniformly varying load starting from zero at the free end, the Bending moment diagram is

A horizontal line parallel to x-axis

A line inclined to x-axis

Follows a parabolic law

Follows a cubic law

Q12 | In a simply supported beam, bending moment at the end

Is always zero if it does not carry couple at the end

Is zero, if the beam has uniformly distributed load only

Is zero if the beam has concentrated loads only

May or may not be zero

Q13 | For any part of the beam, between two concentrated load Shear force diagram is a

Horizontal straight line

Vertical straight line

Line inclined to x-axis

Parabola

Q14 | For any part of a beam between two concentrated load, Bending momentdiagram is a

Horizontal straight line

Vertical straight line

Line inclined to x-axis

Parabola

Q15 | For any part of a beam subjected to uniformly distributed load, Shear forcediagram is

Horizontal straight line

Vertical straight line

Line inclined to x-axis

Parabola

Q16 | For any part of a beam subjected to uniformly distributed load, bending moment diagram is

Horizontal straight line

Vertical straight line

Line inclined to x-axis

Parabola

Q17 | In a simple supported beam having length = l and subjected to a concentratedload (W) at mid-point.

Maximum Bending moment = Wl/4 at the mid-point

Maximum Bending moment = Wl/4 at the end

Maximum Bending moment = Wl/8 at the mid-point

Maximum Bending moment = Wl/8 at the end

Q18 | In a cantilever subjected to a concentrated load (W) at the free end and having length =l, Maximum bending moment is

Wl at the free end

Wl at the fixed end

Wl/2 at the fixed end

Wl at the free end

Q19 | At a point in a simply supported or overhanging beam where Shear force changes sign and = 0, Bending moment is

Maximum

Zero

Either increasing or decreasing

Infinity

Q20 | In a cantilever subjected to a combination of concentrated load, uniformly distributed load and uniformly varying load, Maximum bending moment is

Where shear force=0

At the free end

At the fixed end

At the mid-point

Q21 | Point of contra-flexure is a

Point where Shear force is maximum

Point where Bending moment is maximum

Point where Bending moment is zero

Point where Bending moment=0 but also changes sign from positive to negative

Q22 | Point of contra-flexure is also called

Point of maximum Shear force

Point of maximum Bending moment

Point of inflexion

Fixed end

Q23 | The slope of shear force line at any section of the beam is also called

Bending moment at that section

Rate of loading at that section

Maximum Shear force

Maximum bending moment

Q24 | The direction of shear stress in a loaded beam is

Horizontal

Horizontal as well as vertical

Vertical

None

Q25 | Shear stress in the beam acting on the cross section is

Normal to the cross section

Tangential to the cross section

Neither normal nor tangential

None