Physics MCQs thread.

[abdullah181994]

http://www.xtremepapers.me/CIE/Internat ... 9_qp_1.pdf
can some one explian me question 6 and 18 plz

 

[arlery]

http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s09_qp_1.pdf
can some one explian me question 6 and 18 plz

In question 18, they're saying the liquid level rises by a distance 'h'.
This means the liquid on the left side will decrease by h and and on the right side will increase by h, meaning that the height of liquid on right side is 2h.

Therefore, pressure is 2hpg.

 

[abdullah181994]

plz explain

 

[yubakkk]

check units........only d match

 

[Mobeen]

check units........only d match

is this the only way?

 

[yubakkk]

ya there iz not any way i know
in most of the difficulty q. in physics unit checking is important. of u dont know 2 do check unit it may help u

 

[Mobeen]

yes thannks !

 

[yubakkk]

can any one?/

 

[arlery]

this has been explained in the previous pages.

 

[yubakkk]

which page plesae?????/??

 

[arlery]

viewtopic.php?f=26&t=9216&start=60

page 7-8

 

[abdullah181994]

plz plz explian

 

[MHHaider707]

ya there iz not any way i know
in most of the difficulty q. in physics unit checking is important. of u dont know 2 do check unit it may help u

It can also be done by using third eqn of motion, F=ma and F=qE!!!

 

[arlery]

It's A because upthrust is always greater then weight and downward forces.

 

[yubakkk]

o yes u r right

 

[arlery]

ya there iz not any way i know
in most of the difficulty q. in physics unit checking is important. of u dont know 2 do check unit it may help u

It can also be done by using third eqn of motion, F=ma and F=qE!!!

Can you please elaborate?

 

[MHHaider707]

plz plz explian

its A coz S and Q are at same depths so S = Q

R is more deep than P so R > P......it is the upthrust concept!!

hope you get it..

 

[yubakkk]

any one has xplain this answer?? in which page??

 

[MHHaider707]

ya there iz not any way i know
in most of the difficulty q. in physics unit checking is important. of u dont know 2 do check unit it may help u

It can also be done by using third eqn of motion, F=ma and F=qE!!!

Can you please elaborate?

Ok now see.....
third eqn of motion is v^2 = u^2 + 2as
now... v = 0 , u = v , s = x and a is negative as electron will decelerate!!!

so for a we use a = F/m and F = qE
q is the elementary charge wich is denoted by e so F= eE

now put substitute these values in that third eqn of motion
v^2 - 2(eE/m)x = 0
make x the subject of formula and answer would be D!!!!

 

[aliya_zad]

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

PLS HELP ME!!