Deck 1: Mechanical Properties and Deformation of Materials

Question 1

What is elasticity?

A)ability to re-gain It's original size and shape
B)ability to produce permanent deformation
C)both
D)none of above

Answer 1

ability to re-gain It's original size and shape

Question 2

What is modular ratio?

A)ratio of deflection in each material
B)ratio of modulus of elasticity of bot h material
C)ratio of load acting in each section
D)all of above

Answer 2

ratio of load acting in each section

Question 3

3.5 m long bar is under tensile load and due to that increase in length of bar is 1.75 mm then strain =

A)0.0035
B)0.0005
C)0.002
D)0.0175

Answer 3

0.002

Question 4

The increase in the length of a bar of length 1 m, area 300 mm², modulus of elasticity 2×10⁵ N/mm² due to a tensile load of 120 KN is .

A)1 mm
B)2mm
C)3mm
D)4mm

Question 5

Shear stress causes .

A)Deformation
B)Elongation
C)contraction
D)None of above

Question 6

which of the following has same unit?

A)modulus of elasticity, pressure, stress
B)elasticity, strain, stress
C)pressure, strain, stress
D)modulus of elasticity, strain, modulus of rigidity

Question 7

unit of stress is .

A)Pascal
B)Newton
C)N/m²
D)a and c both

Question 8

In composite section deformation is same in both materials.

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

Question 9

which of the following is type of stress?

A)tensile stress
B)compressive stress
C)shear stress
D)all of the above

Question 10

Strain is defined as the ratio of

A)change in volume to original volume
B)change in length to original length
C)change in cross-sectional area to original cross-sectional area
D)any one of the above

Question 11

Hooke's law holds good up to

A)yield point
B)limit of proportionality
C)breaking point
D)elastic limit

Question 12

Young's modulus is defined as the ratio of

A)volumetric stress and volumetric strain
B)lateral stress and lateral strain
C)longitudinal stress and longitudinal strain
D)shear stress to shear strain

Question 13

The unit of Young's modulus is

A)mm/mm
B)kg/cm
C)kg
D)kg/cm²

Question 14

Deformation per unit length in the direction of force is known as

A)Strain
B)lateral strain
C)linear strain
D)linear stress

Question 15

It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called

A)internal resistance
B)tensile stress
C)transverse stress
D)compressive stress

Question 16

The materials having same elastic properties in all directions are called

A)ideal materials
B)uniform materials
C)isotropic materials
D)elastic materials.

Question 17

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

Question 18

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)remain unaffected

Question 19

The intensity of stress which causes unit strain is called

A)unit stress
B)bulk modulus
C)modulus of rigidity
D)modulus of elasticity

Question 20

Which of the following has no unit

A)kinematic viscosity
B)surface tension
C)bulk modulus
D)strain

Question 21

Euler's formula states that the buckling load P for a column of length l, both ends hinged and whose least moment of inertia and modulus of elasticity of the material of the column are I and E respectively, is given by the relation

A)P=?2EI/L²
B)P=?L²/EI
C)P=?EI/L²
D)P=?2EI/L³

Question 22

Rankine-Golden formula accounts for direct as well as buckling stress and is applicable to

A)very long columns
B)long columns
C)short columns
D)intermediate columns

Question 23

Maximum deflection of a cantilever due to pure bending moment M at its free end, is

A)ML²/3EI
B)ML²/4EI
C)ML²/6EI
D)ML²/2EI

Question 24

The ratio of the effective length of a column and minimum radius of gyration of its cross-sectional area, is known

A)buckling factor
B)slenderness ratio
C)crippling factor
D)none of these

Question 25

A long vertical member, subjected to an axial compressive load, is called

A)a column
B)a strut
C)a tie
D)a stanchion