Physics MCQs thread.

[abdullah181994]

:crazy: :%) :unknown:

 

[abdullah181994]

:crazy: :no:
plz plz plz plz plz plz explain

 

[unique840]

:crazy: :no:
plz plz plz plz plz plz explain

i also need xplanation of dis ques

 

[Hateexams93]

:crazy: :no:
plz plz plz plz plz plz explain

okay this one is easy , as u can see it says it contracs , without being deformed (same curve is obtained when load is removed ) ..so this only shows elastic behaviour

 

[Hateexams93]

some1 plz answer to the previous questions plzzzzzzzzzzzzzz

 

[unique840]

24 Two springs P and Q both obey Hooke’s law. They have spring constants 2k and k respectively.
The springs are stretched, separately, by a force that is gradually increased from zero up to a
certain maximum value, the same for each spring. The work done in stretching spring P is WP,
and the work done in stretching spring Q is WQ.
How is WP related to WQ?
A WP = 0.25
 WQ B WP =
0.5 WQ C WP = 2WQ D WP = 4WQ
CAN some1 plz show the working??
WHY ITS B ?

W.D = (1/2)*k*x
when force is constant, k is indiectly proportional to extension
for spring P, extention will be 1/2
for spring Q, extention will be 2
so w.d for P is (1/2)*2k*(1/2)
n w.d for Q is (1/2)*k*2
SO WP=0.5 of WQ

how did u get extension 2 for Q ?

sorry sorry. mistake. fro spring Q, extention is 1.
n w.d = (1/2)*k*x^2
for P, (1/2)*2k*(1/2)^2
for Q, (1/2)*k*(1)^2

 

[unique840]

:crazy: :no:
plz plz plz plz plz plz explain

okay this one is easy , as u can see it says it contracs , without being deformed (same curve is obtained when load is removed ) ..so this only shows elastic behaviour

but the ans says elastic n plastic

 

[unique840]

:crazy: :%) :unknown:

we find work by multiplying the force with the parallel distance
so work will be Fs
potential energy = work done = Vq
q is constant. and V is decreasing from left to right cox the direction of field is from left to right.
so ans will be A.
hope you got it

 

[Hateexams93]

:crazy: :no:
plz plz plz plz plz plz explain

okay this one is easy , as u can see it says it contracs , without being deformed (same curve is obtained when load is removed ) ..so this only shows elastic behaviour

but the ans says elastic n plastic

answer says elastic , bUT NOT plastic check it again

 

[Hateexams93]

sorry sorry. mistake. fro spring Q, extention is 1.
n w.d = (1/2)*k*x^2
for P, (1/2)*2k*(1/2)^2
for Q, (1/2)*k*(1)^2

exactly and what u get is C , but the answer is B

 

[unique840]

sorry sorry. mistake. fro spring Q, extention is 1.
n w.d = (1/2)*k*x^2
for P, (1/2)*2k*(1/2)^2
for Q, (1/2)*k*(1)^2

exactly and what u get is C , but the answer is B

hmm... ur right. now we shud w8 for sum1 intelligent to answer this question :Search: :crazy: :%)

 

[Hateexams93]

hmm... ur right. now we shud w8 for sum1 intelligent to answer this question :Search: :crazy: :%)

lol..actually i got it now ...it says how is Wp RELATED to Wq ..which means we have to find out the ratio of this two..i got the answer

 

[unique840]

hmm... ur right. now we shud w8 for sum1 intelligent to answer this question :Search: :crazy: :%)

lol..actually i got it now ...it says how is Wp RELATED to Wq ..which means we have to find out the ratio of this two..i got the answer

i also got it. thnku

 

[Hateexams93]

SOME1 plz answer to the previous questions !!!!!!!!!!!!!

 

[unique840]

SOME1 plz answer to the previous questions !!!!!!!!!!!!!

which previous ques? can u post it again?

 

[Hateexams93]

on this page , last Q viewtopic.php?f=26&t=9216&start=570

 

[unique840]

on this page , last Q viewtopic.php?f=26&t=9216&start=570

i also dun knw the answer to tht ques. sorry

 

[Hateexams93]

and this one please

 

[arlery]

Is it C?

 

[unique840]

and this one please

wat is the ans of dis?