Theory of Structures MCQ Questions & Answers

Theory of Structures MCQs : This section focuses on the "Theory of Structures". These Multiple Choice Questions (MCQs) should be practiced to improve the Theory of Structures skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

The shape factor of standard rolled beam section varies from

A. 1.10 to 1.20

B. 1.20 to 1.30

C. 1.30 to 1.40

D. 1.40 to 1.50

Question 2

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

A. Compound beams

B. Indeterminate beams

C. Determinate beams

D. Composite beams.

Question 3

Stress may be defined as

A. force per unit length

B. force per unit volume

C. force per unit area

D. none of these.

Question 4

Pick up the correct statement from the following:

A. Hoop strain of the walls of a cylinder due to liquid is

B. Longitudinal strain in the walls of a cylinder due to liquid is

C. Volumetric change in the cylinderdue to liquid is

D. All the above.

Question 5

In plastic analysis, the shape factor for a triangular section, is

A. 1.5

B. 1.34

C. 2.34

D. 2.5

Question 6

In plastic analysis, the shape factor for a circular section, is

A. 1.5

B. 1.6

C. 1.7

D. 1.75

Question 7

Pick up the incorrect statement from the following : The torsional resistance of a shaft is directly proportional to

A. modulus of rigidity

B. angle of twist

C. reciprocal of the length of the shaft

D. moment of inertia of the shaft section.

Question 8

A load of 1960 N is raised at the end of a steel wire. The minimum diameter of the wire so that stress in the wire does not exceed 100 N/mm2 is :

A. 4.0 mm

B. 4.5 mm

C. 5.0 mm

D. 5.5 mm

Question 9

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

A. 1 : 1 1/2 : 2

B. 2 : 1 1/2 : 1

C. 01:01:02

D. none of these.

Question 10

Stress may be expressed in Newtons

A. per millimetre square (N/mm2)

B. per centimetre square (N/cm2)

C. per metre square (N/m2)

D. All of the above.

Question 11

In plastic analysis, the shape factor for rectangular section, is

A. 1.4

B. 1.5

C. 1.6

D. 1.7

Question 12

Keeping the depth d constant, the width of a cantilever of length l of uniform strength loaded with a uniformly distributed load w varies from zero at the free end and

A. at the fixed end

B. at the fixed end

C. at the fixed end

D. at the fixed end

Question 13

A rolled steel joist is simply supported at its ends and carries a uniformly distributed load which causes a maximum deflection of 10 mm and slope at the ends of 0.002 radian. The length of the joist will be,

A. 10 m

B. 12 m

C. 14 m

D. 16 m

Question 14

For determining the support reactions at A and B of a three hinged arch, points B and C are joined and produced to intersect the load line at D and a line parallel to the load line through A at D'. Distances AD, DD' and AD' when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is

A. 30°

B. 45°

C. 60°

D. 90°

Question 15

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

A. m = 2j - 3

B. j = 2m - 3

C. m = 3j - 2

D. j = 3m - 2

Question 16

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

A. Guest's or Trecas' theory

B. St. Venant's theory

C. Rankine's theory

D. Haig's theory

Question 17

A steel rod 1 metre long having square cross section is pulled under a tensile load of 8 tonnes. The extension in the rod was 1 mm only. If Esteel = 2 x 106 kg/cm2, the side of the rod, is

A. 1 cm

B. 1.5 cm

C. 2 cm

D. 2.5 cm

Question 18

The normal component of a force inclined through θ° is obtained by multiplying the force by

A. sin θ

B. cos θ

C. tan θ

D. sin θ cos θ

Question 19

If Q is load factor, S is shape factor and F is factor of safety in elastic design, the following:

A. Q = S + F

B. Q = S - F

C. Q = F - S

D. Q = S x F

Question 20

If ΣH and ΣV are the algebraic sums of the forces resolved horizontally and vertically respectively, and ΣM is the algebraic sum of the moments of forces about any point, for the equilibrium of the body acted upon

A. ΣH = 0

B. ΣV = 0

C. ΣM = 0

D. all the above.

Question 21

A spring of mean radius 40 mm contains 8 action coils of steel (N = 80000 N/mm2), 4 mm in diameter. The clearance between the coils being 1 mm when unloaded, the minimum compressive load to remove the clearance, is

A. 25 N

B. 30 N

C. 35 N

D. 40 N

Question 22

A material is said to be perfectly elastic if

A. it regains its original shape on removal of the load

B. It regains its original shape partially on removal of the load

C. it does not regain its original shape at all

D. none of these.

Question 23

The point of contraflexure is the point where

A. B.M. changes sign

B. B.M. is maximum

C. B.M. is minimum

D. S.F. is zero.

Question 24

Principal planes are subjected to

A. normal stresses only

B. tangential stresses only

C. normal stresses as well as tangential stresses

D. none of these.