AS Physics P1 MCQs Preparation Thread.

[MysteRyGiRl]

Great i officially suck @ physics so ya any 1 out there pretty plz help poor old me with this
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s06_qp_1.pdf
Q28
d ans is D

thanx a bunch

i used x=lamda*d/a.... taking x as 4*10^-3 and a as 0.5, lamda as 600*10^-9 and 2d... i got 16 something so D as da asnwer...

 

[mominzahid]

the total sum of KE and PE of d molecules

thanks

 

[Peter Check]

As value of R is inversely proportional to the value of I, Not the other way.

Can you elaborate on that...R=V/I and I=V/R, value of R is inversely proportional to the value of I and also the other way round!

 

[Peter Check]

what is da asnwer?

gud

its in one of da pprs and da option is sort of obvious lol sory

B

 

[Peter Check]

Can anyone please help me with these 3 questions??? For the first one, isn't a complete wavelength the red line???So how is the answer B

 

[sahania]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_qp_11.pdf
Q4 anyone ??? The answer is B
Would appreciate your response !!

 

[xyz!]

how do v calculate the reading on a micrometer screw gauge in general? n also solve dis Questn pls....

 

[xxxtoughxxx]

Q34
lets draw a diagram first View attachment 12820

now the resistance in each wire is 0.005 per meter so resistance in 1 wire is 800 * 0.005=4
so both wires have resistance 8

we can redraw the diagram and place the resistanc of the wires as 1 single resistor component
View attachment 12821

the resistance of the relay is 16/0.6= 26.6667

using equation v/E = R1/R1 + R2

so 16/E = 26.667/26.667 + 8 solve to get E is 20.8

Q27 i can't do

Q34 answer is B because i higher resistivity for same length and area means more resistance it can't be C because it doesn't fall that sharply

Q31 answer is A because when there is a current the electrons flow in the wire when there aren't they move absurdly as they orbit protons (if you took chemistry then remember metallic structre)

and next time post paper + ms

tyy i will but why cant in 31 why cant it be B i mean we use the idea in knowing emf of another batttery

 

[bloody_mary]

tyy i will but why cant in 31 why cant it be B i mean we use the idea in knowing emf of another batttery

what?? what other battery?

 

[MysteRyGiRl]

Can anyone please help me with these 3 questions??? For the first one, isn't a complete wavelength the red line???So how is the answer BView attachment 12930View attachment 12931View attachment 12932

no wavelength will be da first full block...see from where it starts and keep counting till it reaches da same point again...dis will be ur 1 wavelength..here they r asking for frequency...if u count da number of wavelngths there r 8...amplitude of each wave is 1.75 and time period is 10 so 8*1.75*10= 140
nxt question answer is A..just remember dat for velocities alone u just need to see dat if they are in opposite directions there will be a + sign and if both da velocities are in oposite direction then it will be negative so initial u will be added up and final will be subtracted
sory i hvnt done da last 1

 

[sahania]

Can anyone please help me with these 3 questions??? For the first one, isn't a complete wavelength the red line???So how is the answer BView attachment 12930View attachment 12931View attachment 12932

Q7... yes, you're correct.. now notice it yourself... the wave is covering 7th of the portion out of 10... therefore, 1/007= 142.8 approx 140 Hz

 

[sahania]

Can anyone please help me with these 3 questions??? For the first one, isn't a complete wavelength the red line???So how is the answer BView attachment 12930View attachment 12931View attachment 12932

Q36. use the potential divider rule

5/7.5 multiplied by 2 = V
V=4/3
2-4/3 = 2/3V that is A

 

[Peter Check]

ok as it involves hieght we r gona take kinetic energy and potential energy too..
1/2 mu^2 = mgh
1/2 mv^2= (mgh /2) (cz its saya half hieght)
now divide them in da same form as given above...from left syd 1/2 cancels, m cancels out..from ryt syd m and g cancels out leaving us with u^2/ v^2 = 2/1
da question asks da ratio of v by u so invert da equation which gives v^2 / u^2 = 1/2 hence 2 remove da square root v/u=1/sq root of 2 which is C

thnks a tonne!

 

[sahania]

please help ....

 

[Daniyal23]

I can do only 4 past papers today...Im doing latest 4 past papers is this ok?

 

[xyz!]

pls help me wid dis Q...

 

[Peter Check]

Q36. use the potential divider rule

5/7.5 multiplied by 2 = V
V=4/3
2-4/3 = 2/3V that is A

Why did you do 2-4/3 ?

 

[bloody_mary]

pls help me wid dis Q...

is the answer C?
if it is then i can explain my working

 

[bloody_mary]

I can do only 4 past papers today...Im doing latest 4 past papers is this ok?

you should do at least 5 so only 1 more paper

 

[biba]

You have to draw a tangent to the curve at that point..then you find out the gradient of that tangent which will be the acceleration

yeah i got it, i was just doing a stupid mistake
btw thanxx