physics mcq help needed! urgent!

[nid404]

Her name is Queen Nandita Ramakrishna the third.

Thanks for answering that dude. + rep

[ifraha18]

q18 nov 2005.?

[halosh92]

for variant 1...


i personally find this question difficult and time consuming, so here's an easier way

R1 and R2 HAVE to be equal because they are both vertical and they have the same masses connected to them...when we come to the T's, they cant be equal because you have changed the angles at which they are positioned and therefore the answer which meets those requirments is B


examiners actually said that students will find an easier way of doing questions rather than deriving long stepped equations such as teachers (A)

thankyou
but i need variant 2

[Saladin]

Thanks for answering that dude. + rep

is that really ur name?

[AN10]

ppl there is a mcq which is really bothering me....PLZ SOLVE.

Sound from a small loudspeaker L reaches a point P by two paths which differ in length by 1.2m. When the frequency of the sound is gradually increased, the resultant intensity at P goes through a series of maxima and minima. A maximum occurs when the frequency is 1000 Hz and the next maximum occurs at 1200 Hz. What is the speed of sound in the medium between L and P?

A   200
B   240
C   480
D   1200
E   1400

[[Spy]]

q18 nov 2005.?

since the pressures are equal then P1=P2

P1 for X is equal to 800*9.8*h1

P2 For Y is equal to 1200*9.8*h2

if you make them equal to each other (since pressure is equal, cause thats what they are asking for)

then....7840h1=11760h2
re-arrange to give h2/h1=7840/11760, that ratio gives 2/3

then you check which one of the choices gives a ratio of 2/3 when you divide the length of Y OVER X because we used h2/h1

[nid404]

came across a question in june 2002 q3
Which formula could be correct for the speed v of ocean waves in terms of the density ? of seawater,
the acceleration of free fall g, the depth h of the ocean and the wavelength ??
A : root g lambda
B root g/h
C root rowgh
D root g/row

In this particular question check the units on each side.

unit for v= m/s

[ifraha18]

Thanks man!!! ND NOV 2005 Q7

[nid404]

is that really ur name?

hasna tha? 

[[Spy]]

Thanks man!!! ND NOV 2005 Q7

CHECK FOR HOMOGENITY!!!!! it asks for acceleration there fore the units have to be m/s^-2 then i think B and D cancel out and your left with A and C,, but you need time difference obviously so its C

[[Spy]]

thankyou
but i need variant 2

its not opening on free exam papers, please post it here

[halosh92]

CHECK FOR HOMOGENITY!!!!! it asks for acceleration there fore the units have to be m/s^-2 then i think B and D cancel out and your left with A and C,, but you need time difference obviously so its C

the answer is D though

[halosh92]

june 2007
Q20

[[Spy]]

the answer is D though

yeah im sorry its D because at C, homogenity does not apply because you have S^2-S^2

[[Spy]]

june 2007
Q20

Answer is B
at X it has to be tension because its opposite directions, and at Y it also has to be tension because if you look at the far end of the pillar horizantally, at the curved part on the right, if you trace the force exerted by F, you see that it applies a pulling force on Y therefore its tension, i would also assume Z is tension, BUT here's paper 1 tricks, you dont have Z with tension and your sure X and Y are tension there fore it has to be B