AS Physics P1 MCQs Preparation Thread.

[itallion stallion]

the second wire will also have young modulus: E because the seconnd wire is also made of the same material nd the length nd diameter r only given to confuse ppl....

will the youngs modulas of two wires always be same if they are of same material,and the diameter and length will never affect it.thanks alot

 

[sweetjinnah]

will the youngs modulas of two wires always be same if they are of same material,and the diameter and length will never affect it.thanks alot

yes only material tells abt young modulus....only same materials hav same young modulus..

 

[sweetjinnah]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s05_qp_1.pdf

Question 25 pls

I = k A^2
k=I/A^2 (step 1)
at other position of meter...2I=k(x^2)
2I= put the value of k u took in first * x^2
2I= (I/A^2) * x^2
now solve for x .....u will get x=square root 2 * A
hope u get it....

 

[itallion stallion]

yes only material tells abt young modulus....only same materials hav same young modulus..

thanks!!!

 

[Amber]

I = k A^2
k=I/A^2 (step 1)
at other position of meter...2I=k(x^2)
2I= put the value of k u took in first * x^2
2I= (I/A^2) * x^2
now solve for x .....u will get x=square root 2 * A
hope u get it....

Thnx a lot!!

 

[ZainH]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s09_qp_1.pdf

Questions: 20, 25 and 40 please.

Thank you.

 

[itallion stallion]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w11_qp_11.pdf how to do q4 and 20(confusion in direction)

 

[prettypearlshy]

calculating the mass of the liquid,
it is (70 - 20) +/- (1+1)
= 50 +/- 2 [uncertainties are added because it is addition we are doing]

now density is mass / volume that means in this absolute uncertainties of mass and volume will be added

so
absolute uncertainty in density = absolute uncertainty in mass + absolute uncertainty in volume
absolute uncertainty in density = ( 2/50 ) + ( 0.6/10 )
absolute uncertainty in density = 0.10

uncertainty = absolute uncertainty * real value
uncertainty = 0.10 * 5 = 0.5

So, B is the answer!

Thank you so much for this! i always find uncertainty questions confusing :/

 

[Mairaxo]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf how to do q4 and 20(confusion in direction)

Q4- substitute symbols by units. m^3/P = QS^2
then substitute P and Q using the options. Both sides should cancel eachother out
Q20- first find magnitude equation. E=F*d and F=ma so E=mad. a=E/md and as d is X here a=E/mx
then find direction. energy decreases towards Q means it is attracted towards Q so direction is to the right.

 

[sweetjinnah]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s09_qp_1.pdf

Questions: 20, 25 and 40 please.

Thank you.

first mcq 20: step 1 Eof wire P=E of wire Q
then put Fl/Ae= Fl/Ae
put values of all nd solve u vl get Ep/Eq = 4/1 hence ans is D
now 25: d sintheta =n lamda
sin theta / lamda = n/d
d=1/N (where N = number of lines on grating)
so, n/(1/N)
n* N/1
hence gradient= nN
ans = A
now 40: B^11 -5 + He^4-2 ----------> N^14-7 + n ^1-0
i hope u get this thing i really cudnt understand how to write this....

 

[salvatore]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s09_qp_1.pdf
Could anyone please explain no. 11?
I don't understand why P is less than R.. since the body is underwater, isn't P supposed to be greater than R??

 

[Raghad Dia]

Can someone explain O/N 2003 #4 for me please

 

[Lyfroker]

i need the ms for m/j 2001 p1

 

[IsraJ]

Can someone explain O/N 2003 #4 for me please

The percentage uncertainty is found by the formula- uncertainty/total value *100
since the reading is being taken twice in this question...one at 40 degrees and the other at 100 degrees...the uncertainty is doubled due to two readings being taken and the total value is 60 degrees here.
0.5*2/60*100 =1.7% D

 

[IsraJ]

i need the ms for m/j 2001 p1

here you go

 

[IGCSEstudent2012]

sum1 solve ths pls..
x=P-Q
P is 1.27 +- 0.02m
Q is 0.83+- 0.01m
What is the %uncertainty in x?

 

[syed1995]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s09_qp_1.pdf
Could anyone please explain no. 11?
I don't understand why P is less than R.. since the body is underwater, isn't P supposed to be greater than R??

Pressure=Density*G*depth

the more the depth the more the pressure.. pressure at same depths is constant. So answer should be A.

 

[syed1995]

sum1 solve ths pls..
x=P-Q
P is 1.27 +- 0.02m
Q is 0.83+- 0.01m
What is the %uncertainty in x?

With addition and subtraction.. we just add the uncertainities..

+-0.03 is the uncertainity is x ..

and % uncertainity is 0.03/0.44 *100 = 6.81%

 

[IGCSEstudent2012]

With addition and subtraction.. we just add the uncertainities..

+-0.03 is the uncertainity is x ..

and % uncertainity is 0.03/0.44 *100 = 6.81%

shukran!

 

[Raghad Dia]

In M/J 2004 #25 ,why is point P moving downwards?