AS Physics P1 MCQs Preparation Thread.

[MA1234]

A double slit experiment, using light of wavelength 600 nm, results in fringes being produced on a
screen. The fringe separation is found to be 1.0 mm.
When the distance between the double slits and the viewing screen is increased by 2.0 m, the
fringe separation increases to 3.0 mm.
What is the separation of the double slits producing the fringes?
A 0.4 mm B 0.6 mm C 0.9 mm D 1.2 mm
umar plzz help plzz!

 

[kinglynx]

https://fbcdn-sphotos-a.akamaihd.ne...x720/575878_10151000536716535_669768254_n.jpg
https://fbcdn-sphotos-a.akamaihd.ne...720/522651_10151000535991535_2111798381_n.jpg

CAN SOMEONE PLEASE EXPLAIN THESE TWO!!!

 

[leosco1995]

https://fbcdn-sphotos-a.akamaihd.ne...x720/575878_10151000536716535_669768254_n.jpg
https://fbcdn-sphotos-a.akamaihd.ne...720/522651_10151000535991535_2111798381_n.jpg

CAN SOMEONE PLEASE EXPLAIN THESE TWO!!!

AAAA they are still tilted!!

For 1)
The potential at P and Q is the same (because both points experience the same electric field strength), and when 2 points have the same potential no work is done between them. Therefore the answer is A.

For 2), The parallel combination is getting 1/3V and also 1/2 of the total current. Total power loss is therefore 1/6 of the total power. Alternatively, you can use a fake value for the resistance of the resistors (since they are equal) and then calculate the value of the power loss manually. Regardless of the value you use you will get 2W as the answer.

 

[leosco1995]

omfg, will someone please answer about that nuclear decay question!!!! how the hell are neutrons conserved?

I already did..

 

[XPFMember]

AsSalamoAlaikum Wr Wb!

need help with this plz:

 

[XPFMember]

AsSalamoAlaikum Wr Wb!

need help with this plz:

 

[XPFMember]

AsSalamoAlaikum Wr Wb!

need help with this plz:

 

[leosco1995]

AsSalamoAlaikum Wr Wb!

need help with this plz:
View attachment 12176

Q is not providing a couple as they have mentioned that the lower portion of the belt provides no tension. So we calculate the moment of it instead using the upper tension (don't be confused about torque always relating to a couple, it just means turning effect).

Moment of Q = force * p.d. from the pivot (and p.d from pivot is half of the diameter).
3 = f * 15 mm
f = 60 N

With this, you already have your answer but in case you want to calculate P:

Moment of P = force * p.d. from pivot
= 60 * 75 mm
= 4.5 Nm

 

[leosco1995]

AsSalamoAlaikum Wr Wb!

need help with this plz:
View attachment 12175

Brittle materials can't sustain plastic deformation, they just break so B and C are wrong.
Of aluminium and steel, metals usually have a lower plastic deformation while ductile materials like copper and aluminum will deform much more. So A is right.

 

[leosco1995]

AsSalamoAlaikum Wr Wb!

need help with this plz:
View attachment 12174

Force = Pressure / area

If the area is the same, then the force depends on the pressure.

Pressure = ρgh
ρ and g are constant so the pressure depends on the value of 'h'.

At S and Q, 'h' is equal therefore they have the same pressure and same force. At, P and R, 'h' is more for point R therefore the force on P is less than that of R.

So for any point in water, the lower point has more pressure and therefore more force.

So P < R and S = Q. Therefore A is right.

This concept is related to 'floatation'.

 

[Jaf]

need help with this plz:
View attachment 12176

The couple produced in Q has forces acting on the upper belt (towards the right) and in the center of the motor (towards the left). The force does not act on the lower belt as the lower belt is slack (which woudl not have been the case if a force was acting on it).
Hence torque by Q = 3.0 Nm = F x (100/2) x 10^-3 [we're halving the diameter because the distance between the two forces is the radius of the motor and not the diameter).
F = 60N

 

[MysteRyGiRl]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w05_qp_1.pdf
Q no 25..i didnt get da wavelength for air.. used cros multiplication

 

[Jaf]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w05_qp_1.pdf
Q no 25..i didnt get da wavelength for air.. used cros multiplication

In air, the frequency would remain the same. Now do it yourself.

 

[MysteRyGiRl]

In air, the frequency would remain the same. Now do it yourself.

ooookaay am geting da asnwer but y will freq remain da same??

 

[SalmanslK]

the answer is C.but is it cause it's given that the material is same or is there some proper working??

 

[Nibz]

View attachment 12183

the answer is C.but is it cause it's given that the material is same or is there some proper working??

Same material, therefore, same E. Ignore the rest.

 

[Gémeaux]

View attachment 12183

the answer is C.but is it cause it's given that the material is same or is there some proper working??

A material has *one* value for Young Modulus, that's it, as you said.

 

[Idolfanatic95]

ooookaay am geting da asnwer but y will freq remain da same??

when waves travel, they carry energy. When passing from one media to another the energy content of the waves has to stay the same due to the law of conservation of energy.
we know that E=hf where E=Energy of wave, h=planck's constant, f=frequency of wave.
so h being a constant would not change, and f could not change either.
So, the only characteristic of the wave which can change is the velocity and wavelength, which adjust themselves so as to give the same frequence before and after passing through different media.

 

[Ahmed Ali Akbar]

help me in Q NO 16...PLEASE.

 

[umarashraf]

View attachment 12183

the answer is C.but is it cause it's given that the material is same or is there some proper working??

no.. no other working is here...