Deck 3: Materials Mechanics and Elasticity

Question 1

Which type of load is applied in tensile testing?

A)Axial load
B)Shear load
C)Transverse load
D)Longitudinal load

Answer 1

Transverse load

Question 2

Which law is also called as the elasticity law?

A)Bernoulli's law
B)Stress law
C)Hooke's law
D)Poisson's law

Answer 2

Hooke's law

Question 3

The materials which have the same elastic properties in all directions are called __________

A)Isotropic
B)Brittle
C)Homogeneous
D)Hard

Answer 3

Isotropic

Question 4

The calculation of the moment of the body due to the loadings involve a quantity called ____________

A)Moment
B)Inertia
C)Moment of Inertia
D)Rotation

Question 5

Moment of Inertia is the integration of the square of the distance of the centroid and the del area along the whole area of the structure.

A)True
B)False
C)none
D)all

Question 6

What is parallel axis theorem and to whom it is applied?

A)Theorem used to add the two mutually perpendicular moment of inertias for areas
B)Theorem used to add the two mutually perpendicular moment of inertias for volumes
C)Theorem used to add the two mutually perpendicular moment of inertias
D)Theorem used to add the two mutually perpendicular moment of inertias for vectors

Question 7

The parallel axis theorem gives the moment of inertia ______________ to the surface of considerance.

A)Linear
B)Non-Linear
C)Perpendicular
D)Parallel

Question 8

In the calculation of the radius of gyration, we use intensity of loadings. So whenever the distributed loading acts perpendicular to an area its intensity varies __________

A)Linearly
B)Non-Linearly
C)Parabolically
D)Cubically

Question 9

Elongation of a bar of uniform cross section of length „L?, due to its own weight „W? is given by

A)2WL/E
B)WL/E
C)WL/2E
D)WL/3E

Question 10

steel bar 10 mm x 10 mm cross section is subjected to an axial tensile load of 20kN. If the length of bar is 1 m and E = 200 GPa, then elongation of the bar is:

A)1 mm
B)0.5 mm
C)0.75 mm
D)1.5 mm

Question 11

The modulus of rigidity and poisson?s ratio of a material are 80 GPa and 0.3 respectively. Its young?s modulus will be

A)160 GPa
B)208 GPa
C)120 GPa
D)104 GPa

Question 12

If the value of poisson?s ratio is zero

A)the lateral strain is high
B)the material is perfectly elastic
C)there is no linear strain in the material
D)none of the above

Question 13

The ratio between direct stress and volumetric strain is:

A)Bulk modulus
B)Poisson's ratio
C)Factor of safety
D)Modulus of rigidity

Question 14

Young?s modulus of a material which gives 2 kN/mm² stress at 0.01 strain is

A)20kN/mm²
B)0.02kN/mm²
C)200 kN/mm²
D)2000kN/mm²

Question 15

The Young?s modulus of elasticity of a material is 2.5 times its modulus of rigidity. The Poisson?s ratio for the material will be

A)0.25
B)0.33
C)0.50
D)0.75

Question 16

Consider a 250mmx15mmx10mm steel bar which is free to expand is heated from 150C to 400C. what will be developed?

A)Compressive stress
B)Tensile stress
C)Shear stress
D)No stress

Question 17

The safe stress for a hollow steel column which carries an axial load of 2100 kN is 125 MN/m². if the external diameter of the column is 30cm, what will be the internal diameter?

A)25 cm
B)26.19cm
C)30.14 cm
D)27.9 cm

Question 18

The percentage reduction in area of a cast iron specimen during tensile test would be of the order of

A)more than 50%
B)25-50%
C)10-25%
D)negligible.

Question 19

In a tensile test, near the elastic limit zone, the

A)tensile strain increases more quickly
B)tensile strain decreases more quickly
C)tensile strain increases in proportion to the stress
D)tensile strain decreases in proportion to the stress

Question 20

The stress necessary to initiate yielding is

A)considerably greater than that necessary to continue it
B)considerably lesser than that necessary to continue it
C)greater than that necessary to stop it
D)lesser than that necessary to stop it

Question 21

Rupture stress is

A)breaking stress
B)maximum load/original cross-sectional area
C)load at breaking point/A
D)load at breaking point/neck area

Question 22

stress at which extension of material takes place more quickly as compared to increase in load is called

A)elastic point of the material
B)plastic point of the material
C)breaking point of the material
D)yielding point of the material

Question 23

The energy absorbed in a body, when it is strained within the elastic limits, is known as

A)strain energy
B)resilience
C)proof resilience
D)modulus of resilience

Question 24

Resilience of a material is considered when it is subjected to

A)frequent heat treatment
B)fatigue
C)creep
D)shock loading

Question 25

The maximum strain energy that can be stored in a body is known as

A)impact energy
B)resilience
C)proof resilience
D)modulus of resilience