Physics MCQs thread.

[yubakkk]

do areaof base *height same and calculate

 

[MHHaider707]

Hw do u solve dis, i keep getting the ans as 4 bt itz 16...

PLS HELP ME!![/quote]



Is it C???

 

[MHHaider707]

do areaof base *height same and calculate

yeah....rite!!

 

[arlery]

^ I'm confused. Can some one please explain this again?

 

[MHHaider707]

^ I'm confused. Can some one please explain this again?

volume = (22/7) x r^2 x l

now wire x and wire y have same volume so by using the formula of volume we can deduce that in increasing the length of wire Y by factor of 4 the area also decreases by factor of 4

so resistance of y = (resistivity) x 4l / (A/4) it becomes 16(resistivity)x l/A
R of X = (resistivity) x l/A
so the ratio would be 16!!!

Hope you get it!!!

 

[arlery]

^ No I didn't mean this question, I meant the time base setting one on page 72.

 

[MHHaider707]

ohk but i din get that one!!

 

[airborne1944]

Help me explain this question pls guys.

Q21 http://www.xtremepapers.me/CIE/Internat ... 5_qp_1.pdf

 

[hassam]

how to do this???

 

[Xthegreat]

guys, M/J 09 Q20 pls

 

[melon159]

its C i guess coz the material is same so resistivity is same..and they both have same area and length is also x for both

 

[Xthegreat]

its C i guess coz the material is same so resistivity is same..and they both have same area and length is also x for both

the answer is D

 

[melon159]

how is that?

 

[Xthegreat]

how is that?

that is exactly what i am asking except i got A.

 

[yubakkk]

hey any one knows my q. of pg 72
cro

 

[melon159]

whats the ans vubakk?? is it B??

 

[naavo.1234]

Guys can any one answer this question for me please.!!!

i know its easy but i don't know what i am missing.

the answer in marking scheme is A but i think it should be D

if it is A than combined resistance of 3 resistor should be 12. i dont know what to say

 

[melon159]

the combined resistance is 2...so current n circuit = 12/(2+2)=3...now the current is divided in the ratio 1:2 between 6 ohm and 3 ohm resistor,,,hence I=1

 

[luckyboy]

plz explain how to solve this

 

[nidzzz09]

Is the Answer C

Yu need to learn the electromagnetic spectrum