STRENGTH OF MATERIALS

Question 1

What is the ratio of the transverse strain to the corresponding axial strain in a body subjected to uniaxial stress?

Answer 1

Poisson’s ratio

Question 2

What are the four basic forms of deformation of solid bodies?

Answer 2

Tension, compression, bending and twisting

Question 3

What is a structural member supported horizontally and carries transverse loading?

Answer 3

Beam

Question 4

What refers to a slender member which prevents parts of a structure moving towards each other under compressive force?

Answer 4

Strut

Question 5

What refers to the point in which the bending moment changes sign through a zero value?

Answer 5

Point of contraflexure

Question 6

What is the unit of strain?

Answer 6

Unitless

Question 7

Volumetric strain is the:

Answer 7

ratio of change in volume to original volume

Question 8

What refers to the stress in the material at the elastic limit?

Answer 8

Yield stress

Question 9

Which of the following materials has the least modulus of elasticity?

A. Steel
B. Glass
C. Copper
D. Aluminum

Answer 9

B. Glass

Question 10

Within elastic limit, the shear stress is proportional to shear strain. What is the constant of proportionality of this statement called?

Answer 10

Modulus of rigidity

Question 11

What is the unit of the modulus of elasticity?

A. N-m
B. Unitless
C. Pa
D. N-m/s

Answer 11

C. Pa

Question 12

Within elastic limit, the volumetric strain is proportional to the hydrostatic stress. What is the constant that relates these two quantities called?

Answer 12

Bulk modulus

Question 13

What is another term for modulus of rigidity?

Answer 13

Shear modulus

Question 14

How many times greater is the plastic range of strain as compared to the elastic range of strain?

A. 100
B. 200
C. 300
D. 400

Answer 14

C. 300

Question 15

What does it means when the material is said to be “yielding”?

A. The material has pass through plastic range and enter the elastic range
B. The material has pass through elastic range and enter the plastic range
C. The material is in the elastic range only
D. The material is in the plastic range only

Answer 15

The material has pass through elastic range and enter the plastic range

Question 16

What refers to the parallel axis theorem for second moment of area?

Answer 16

Steiner’s theorem

Question 17

The elastic deformation of a material is:

A. directly proportional to cross-sectional area of the material
B. inversely proportional to the modulus of elasticity of material
C. inversely proportional to the force acting on the material
D. inversely proportional to the initial length of the material

Answer 17

B. inversely proportional to the modulus of elasticity of material

Question 18

The strain energy of a member is:

A. inversely proportional to the square of the force acting on the member
B. directly proportional to the modulus of elasticity
C. inversely proportional to the cross-sectional area of the member
D. inversely proportional to the initial length of the member

Answer 18

C. inversely proportional to the cross-sectional area of the member

Question 19

Stiffness is:

A. ratio of force to deformation
B. ratio of force to modulus of elasticity
C. ratio of product of cross-sectional area and initial length to deformation
D. ratio of initial length to cross-sectional area

Answer 19

A. ratio of force to deformation

Question 20

Which of the following substances has the least average coefficient of linear thermal expansion?

A. Copper
B. Concrete
C. Steel
D. Tin

Answer 20

C. Steel

Question 21

Steel has a modulus of elasticity of _____ MPa.

A. 200
B. 2,000
C. 20,000
D. 200,000

Answer 21

D. 200,000

Question 22

What is the maximum moment of a beam supported at both ends and carries a uniform load of w throughout its entire length?

A. wL / 2
B. wL / 8
C. wL2 / 8
D. wL2 / 4

Answer 22

C. wL2 / 8

Question 23

____ is the stress beyond which the material will not return to its original shape when unloaded but will retain a permanent deformation.

Answer 23

Elastic limit