AS Physics P1 MCQs Preparation Thread.

[Suno Yaar]

i

Dude someone answer this question kindly!
What's the order of no. of wavelengths of visible light in one metre?

idk

 

[Obsidian Fl1ght]

number of wavelengths of visible light in one metre?
if so, wavelength of visible light is 400nm->700nm
1/400nm and 1/700nm so roughly 1.4 to 2.5 x 10^6

so around 10 to the order of 6

Thank u.
Best of luck

 

[LeQuavina]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_13.pdf
question 29

 

[Obsidian Fl1ght]

Q 15.
Why is it B and not D??

 

[Obsidian Fl1ght]

Sorry, the link's pathetic and I meant why is it D and NOT B?

 

[6Astarstudent]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w12_qp_13.pdf
question 29

I is proportional to A^2
so I=k(A1)^2
2I = k(A2)^2
so (A2)^2 = 2((A1)^2)
A2 = A1 x squareroot 2

 

[Obsidian Fl1ght]

Can someone briefly describe the Stress/strain graphs of polymeric, crystalline, amorphous solids?

 

[6Astarstudent]

Q 15.
Why is it B and not D??

what's equilibrium?
no net force about any direction
no net torque about any point
there is no force to balance H in B

 

[Obsidian Fl1ght]

Ah yes. Thank u

 

[Suno Yaar]

what's equilibrium?
no net force about any direction
no net torque about any point
there is no force to balance H in B

heyy. pleaseeeeeeee tell me thtat youung double slit condiitons. that what happens if we increase slit size and all those conditions and the effects on the fringes intesity nd spacing. lplzzzzzzzzz

 

[6Astarstudent]

Can someone briefly describe the Stress/strain graphs of polymeric, crystalline, amorphous solids?

Polymeric material is like rubber so here is a really clear diagram

I doubt they'd ask crystalline amorphous solid graphs, those are just choices to confuse the candidates. considering different amorphous / crystaline substances behave differently. some are brittle some are elastic
there is one case however which is glass (amorphous) but it is classified as brittle

 

[Abu mota]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_qp_11.pdf Q.14,Q.34,Q.35
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w10_qp_12.pdf Q.8,Q.15,Q.27,Q.34,Q.40

 

[6Astarstudent]

heyy. pleaseeeeeeee tell me thtat youung double slit condiitons. that what happens if we increase slit size and all those conditions and the effects on the fringes intesity nd spacing. lplzzzzzzzzz

λ=ax/D where λ is wavelength, a is slit separation, x is fringe seperation, D is distance between slit and wall
just rearrange equation to see whether they're proportional or inversely proportional
x= λD/a
so bigger wavelength longer distance smaller slit seperation will mean bigger fringe separation
smaller wavelength shorter distance wider slit separation will mean smaller fringe separation

and fringe intensity is only dependent on the amplitude of the wave. so bigger amplitude means more intense

 

[Abu mota]

#34
wire is in a loop ie. supply -> wire -> relay -> wire -> supply -> wire...... etc. so its in series
for the s10
#9
answer is B because the ball is falling down with constant acceleration so graph will be an reversed parabola
#27
distance between centre and Q, centre and P is both the radius which is the same. so there is no net workdone. answer is A
#29
field lines represent movement of positive charge, since electron is negative so it will mvoe in opposite direction of field line towards observer so answer is D

#33
there are lots of ways for this question
I find V the easiest to use in an explanation
PQR all have same resistance
Q,R have same V while P has 2x of their V so 2V
Power = (V^2)/R
so Power ratio of P Q R =((2v)^2)/R: (V^2)/R : (V^R)/R or 4:1:1
total power is 12, divided to 6 parts so Power of R is 2W

tyvm, but for Q.9 does freely mean without air resistance?

 

[Suno Yaar]

λ=ax/D where λ is wavelength, a is slit separation, x is fringe seperation, D is distance between slit and wall
just rearrange equation to see whether they're proportional or inversely proportional
x= λD/a
so bigger wavelength longer distance smaller slit seperation will mean bigger fringe separation
smaller wavelength shorter distance wider slit separation will mean smaller fringe separation

and fringe intensity is only dependent on the amplitude of the wave. so bigger amplitude means more intense

TTTTTTTTTTTHHHHHHHHHHAAAAAAAAAAAANNNNNNNNNNKKKKKKKKSSSSSSSSSSSSSSSSSSSSS AAAAAAAAAAAAAAALLLLLLLLLLLLLLLOOOOOOOOOOOOTTTTTTTT

 

[6Astarstudent]

tyvm, but for Q.9 does freely mean without air resistance?

no, there is air resistance. freely just means there is no external force besides air resistance.
notice how towards the end (intercept with t axis) gradient is nearly a straight line no longer changing because it has reached terminal velocity.

 

[Obsidian Fl1ght]

s_12_12 q15. WHY is it clockwise and not anti clockwise?
URGENT

 

[Abu mota]

s_12_12 q15. WHY is it clockwise and not anti clockwise?
URGENT

because it is saying the torque needed to stop it from toppling, not the moment caused by the cube.

 

[Obsidian Fl1ght]

s_12_qp17.
Sorry for bothering u guys but again - how do we get 6mgh??

 

[6Astarstudent]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_11.pdf Q.14,Q.34,Q.35
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_12.pdf Q.8,Q.15,Q.27,Q.34,Q.40

S11 qp11
#14
this one is tricky, utilize the kinematics equation
V^2 = U^2 + 2as
so the first drop is
u^2 = 0 + 2ah
the rebound is
0 = v^2 - 2a(h/2) = v^2 - ah
so v^2/u^2 = 1/2
v/u = 1/squareroot 2

#34
R= pl/A
and unit of l/A = m^-1 = V^(-1/3)
so R = p/(V^1/3)

#35
ratio of resistance is 1:2:5 and we know that ratio is current is inverse of that
so must be 1:1/2:1/5 = 10:5:2
so 5x 5/17 = 1.47 answer is C