Strength of Materials Test Questions - Set 9

1)   In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is_________________?

a. more
b. less
c. same
d. more/less depending on composition
e. may have any value
Answer  Explanation 

ANSWER: less

Explanation:
No explanation is available for this question!


2)   Which of the following has no unit __________________?

a. kinematic viscosity
b. surface tension
c. bulk modulus
d. strain
e. elasticity
Answer  Explanation 

ANSWER: strain

Explanation:
No explanation is available for this question!


3)   During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is___________________?

a. 4 tonnes/cm2
b. 8 tonnes/cm2
c. 16 tonnes/cm2
d. 22 tonnes/cm2
e. none of the above
Answer  Explanation 

ANSWER: 8 tonnes/cm2

Explanation:
No explanation is available for this question!


4)   The intensity of stress which causes unit strain is called_______________?

a. unit stress
b. bulk modulus
c. modulus of rigidity
d. modulus of elasticity
e. principal stress
Answer  Explanation 

ANSWER: modulus of elasticity

Explanation:
No explanation is available for this question!


5)   The Young’s modulus of a wire is defined as the stress which will increase the length of wire compared to its original length________________?

a. half
b. same amount
c. double
d. one-fourth
e. four times
Answer  Explanation 

ANSWER: same amount

Explanation:
No explanation is available for this question!


6)   Tensile strength of a material is obtained by dividing the maximum load during the test by the_________________?

a. area at the time of fracture
b. original cross-sectional area
c. average of A. and B.
d. minimum area after fracture
e. none of the above
Answer  Explanation 

ANSWER: original cross-sectional area

Explanation:
No explanation is available for this question!


7)   If the radius of wire stretched by a load is doubled, then its Young’s modulus will be_______________?

a. doubled
b. halved
c. become four times
d. become one-fourth
e. remain unaffected
Answer  Explanation 

ANSWER: remain unaffected

Explanation:
No explanation is available for this question!


8)   A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under_________________?

a. uniform throughout
b. increase uniformly
c. first increase and then decrease
d. increase uniformly first and then increase rapidly
e. increase rapidly first and then uniformly
Answer  Explanation 

ANSWER: increase uniformly first and then increase rapidly

Explanation:
No explanation is available for this question!


9)   The ultimate tensile stress of mild steel compared to ultimate compressive stress is__________________?

a. same
b. more
c. less
d. more or less depending on other factors
e. unpredictable
Answer  Explanation 

ANSWER: more

Explanation:
No explanation is available for this question!


10)   Modulus of rigidity is defined as the ratio of_________________?

a. longitudinal stress and longitudinal strain
b. volumetric stress and volumetric strain
c. lateral stress and lateral strain
d. shear stress and shear strain
e. linear stress and lateral strain
Answer  Explanation 

ANSWER: shear stress and shear strain

Explanation:
No explanation is available for this question!


11)   It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called______________________?

a. internal resistanpe
b. tensile stress
c. transverse stress
d. compressive stress
e. working stress
Answer  Explanation 

ANSWER: tensile stress

Explanation:
No explanation is available for this question!


12)   The unit of Young’s modulus is__________________?

a. mm/mm
b. kg/cm
c. kg
d. kg/cm2
e. kg cm2
Answer  Explanation 

ANSWER: kg/cm2

Explanation:
No explanation is available for this question!


13)   Hooke’s law holds good up to____________________?

a. yield point
b. limit of proportionality
c. breaking point
d. elastic limit
e. plastic limit
Answer  Explanation 

ANSWER: limit of proportionality

Explanation:
No explanation is available for this question!


14)   The stress developed in a material at breaking point in extension is called__________?

a. Breaking stress
b. Fracture stress
c. Yield point stress
d. Proof stress
Answer  Explanation 

ANSWER: Breaking stress

Explanation:
No explanation is available for this question!