Mechanical Properties of Solids

Question 1

Conditions for a body to be rigid

Answer 1

Relative position of the particle remains unchanged when external deforming forces are applied

Question 2

Elasticity

Answer 2

Property of a body to regain its original shape and size after deforming

Question 3

Perfectly Elastic Body

Answer 3

Body that perfectly regain its orginal shape and size after the removal of deforming force

Question 4

Plastic Body

Answer 4

Body remains in partial or fully deformed shape

Question 5

Longitudinal Force

Answer 5

Force that are parallel to the length of the object

Question 6

Stress

Answer 6

Force/Area

Question 7

Strain

Answer 7

Change in length/ Total length

Question 8

Elastic Limit

Answer 8

Maximum stress which on removing the deforming force makes the body recover completely its original state

Question 9

Proportional Limit

Answer 9

Limit in which stress is directly proportional to strain

Question 10

Plastic Region

Answer 10

Region beyond elastic region where material acts as a plastic material

Question 11

Yield Point

Answer 11

Point beyond the elastic region at which the length of the wire or the rod starts increasing without increasing much of stress

Question 12

Breaking Point

Answer 12

Point when strain becomes so large, the object breaks

Question 13

Breaking strength

Answer 13

Maximum stress a material can endure

Question 14

Young’s Module

Answer 14

Longitudinal Stress/Longitudinal Strain
Y= FL/AΔL

Question 15

Reciprocal of the bulk modulus

Answer 15

Compressibility

Question 16

Surface Tension

Answer 16

Property of the liquid surface due to which the surface of the liquid behaves like a stretched membrane

Question 17

Cohesive Force

Answer 17

Intermolecular force between atoms of the molecules of the same substance

Question 18

Adhesive Force

Answer 18

Intermolecular force between atoms or the molecule of different substances

Question 19

Work done by a liquid drop of radius r

Answer 19

4πr^2T

Question 20

Work done by a liquid bubble of radius r

Answer 20

8πr^2T

Question 21

Excess pressure inside a spherical liquid drop

Answer 21

2T/R

Question 22

Excess pressure inside a bubble

Answer 22

4T/R

Question 23

Excess pressure inside a hypothetical liquid cylinder

Answer 23

T/R

Question 24

Force on glass slide

Answer 24

TA/r

Question 25

Height that liquid is going to rise in a capillarity tube

Answer 25

2Tcosθ/rrhog

Question 26

VIscous Force

Answer 26

6πηvr