Physics MCQs thread.

[yubakkk]

i have some problem on mcq may 2010 ppr 11
q.18,21,25,27,35
any one plz??

 

[xHazeMx]

the first is A and the second is D. right?

 

[xHazeMx]

i have some problem on mcq may 2010 ppr 11
q.18,21,25,27,35
any one plz??

post ur questions by either taking a screen shot or copy/paste

 

[Hateexams93]

xHazemx i'm confused more now :s can u draw a diagram explaining what u said

 

[aamir12345]

is it B for that interference question

 

[aamir12345]

and A for that density question

 

[xHazeMx]

xHazemx i'm confused more now :s can u draw a diagram explaining what u said

recheck my first answer, i edited it. tell me if u don't understand it

 

[arlery]

How do I solve this one?

 

[xHazeMx]

How do I solve this one?

answer is C, bear in mind that u have to take the distance FROM THE PIVOT! .. which is 200 x 0.25 = 50 Nm

 

[hassam]

second one is AA...NOT d XHAZEMX

 

[hassam]

 

[xHazeMx]

second one is AA...NOT d XHAZEMX

my answer was A before editing

 

[xHazeMx]

B ?

 

[hassam]

ms says D....it shud be C....IT CNT be D !!!

 

[xHazeMx]

ms says D....it shud be C....IT CNT be D !!!

D is correct hassam. voltage across XY decreases as resistance of variable resistor increases ( as it would take more voltage ). so in order to achieve the balance between the voltages again in the galvanometer. it has to move towards Y

 

[hassam]

YA THAT WAS b

 

[xHazeMx]

YA THAT WAS b

:Yahoo!:

 

[arlery]

Why is the answer D?

 

[xHazeMx]

Why is the answer D?

Weight = mg
retarding force = kv ( air resistance )
the object is moving at a steady speed which means that weight is equal to the retarding force
Hence,
kv=mg
v=mg/k

kinetic energy = 1/2 m v^2
kinetic energy = 1/2 m ( mg/k ) ^2
kinetic energy = 1/2 m ( m^2 g^2 / K^2 )
kinetic energy = m^3 g^2 / 2 K^2
so the answer is D

 

[arlery]

Why is the answer A?