Physics mcq

[hamizahmed]

can anyone xplain me the mcq of jun09 q 19. I do not understand why it is aluminium..

 

[1992]

for it to be plastic deformation, it needs to be ductile firstly. so its A or D. then steel is too hard to remain in deformed and also requires a lot of force.
therefore , aluminium is the only one, as its easy to change shape and requires litle force.

 

[1992]

Can someone explain for the same paper, june 2009
Q 9, 10, 13, 15, 18, 20, 25, 29 and 31 pleaseee i know its a lot but i canot do them S:
i think the papers are each time becoming more dificult

 

[hamizahmed]

han to dats wat ques is asking, which material can sustain the greatest plastic deformation??? Since steel requires a lot of force to be deformed, it shud be steel

 

[ashhadazam]

Can anyone throw light on Hamiz's qustion ?

 

[princesszahra]

mad he didnt aask a question
he told u the question!! lol!!!!!!!!!!!!! :lol: :lol: :lol: :roll: :roll:

 

[ashhadazam]

OH come on stop playing with the words now i am Asking
Why is aluminium the correct answeR? ?? Isnt steel more resistive to plastic deformation ?

 

[maximum_user]

since steel is not ductile..it will not have large plastic deformation...so if deformed beyond its limit it would break..have high UTS(ultimate tesile strength)...so its clear aluminium is more ductile than steel and is deformed to a greater extent than steel if same force is applied...thats common sense

 

[ashhadazam]

errrr.... it is mentioned in the option that steel is ductile

 

[1992]

but its less ductile, i said before why
and correct that it has hihg tensile stress.
could anyone explain the Qestions i posted pleasee, tomorroow is exman:SS