Physics Paper 12 How was it

[floral123]

h

Here are some of the repeated questions
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View attachment 13143
1 A
2 A
3 A
4 D
5 D

how come 1 A??
its 1.7!!

 

[fathimaash]

did we get a similar question like dis

 

[MOMO123123]

did we get a similar question like dis

yea, wts the answer here?

 

[fathimaash]

yea, wts the answer here?

B

 

[MOMO123123]

B

in our exam its D which is the same as B on ur question, so D in our exam is the wrong answer because in ur question theres friction on the wall and on the ground, but in our exam one of them was frictionless, so D in our exam is the wrong answer too bad i answered that

 

[fathimaash]

in our exam its D which is the same as B on ur question, so D in our exam is the wrong answer because in ur question theres friction on the wall and on the ground, but in our exam one of them was frictionless, so D in our exam is the wrong answer too bad i answered that

So wats da corrct answr B or D?

 

[Ahmed Tariq]

I= navq...since n is the same, and q is the same, therfore a is inversely proportional to the velocity, so if area is less, velocity is greater....new A level concept....not in many books though, its called current formula

Velocity=Current/(n*area*q)
where n is electrons per meter cubed, area is cross section of wire, q is elementary charge

Is this formula even in our syllabus?
And could you kindly recall the displacement of the particle question?

 

[MOMO123123]

So wats da corrct answr B or D?

i really dnt know i dont remember the choices, all i remember is that i put D, and i guess its wrong... so most probably B though i have no idea wt it was

 

[Arslanjaved]

strain energy was 0.12J..

are u sure about that? i mean confirm?

 

[fathimaash]

h
how come 1 A??
its 1.7!!

k dude u knw da friction is 6N
so force-friction=resultant (ma)
force= 2*10=20N friction=6N total mass is 8+2=10N substitue in da eqn
20-6=10a
a=1.4ms-2
hope u get it..

 

[fathimaash]

are u sure about that? i mean confirm?

yes 100% confirm all my friends got dis answer im sure abut it

 

[Arslanjaved]

yes 100% confirm all my friends got dis answer im sure abut it

what about the pressure question?
the one in which piston was moved out and container was heated?

 

[fathimaash]

what about the pressure question?
the one in which piston was moved out and container was heated?

sry i cant remember..

 

[MOMO123123]

what about the pressure question?
the one in which piston was moved out and container was heated?

i really think its D, number of collisions per second increases.. cz its the only one that makes sense, velocity does increase because they gain ke, mean seperation does increases because pressure remains constant so volume must increase.. and i dont remember option B, but D was the only one that made sense not to be correct

 

[Arslanjaved]

sry i cant remember..

ohk last one now
what about the laser pulse question?
can u tell the question if u remember along with the answer?
and yes do post it as soon as u know

 

[fathimaash]

ohk last one now
what about the laser pulse question?
can u tell the question if u remember along with the answer?
and yes do post it as soon as u know

speed=3x10^8,
total d=150x2=300m
t=d/s
300/3x10^8=1x10^-6 s

 

[LoveoftheGame]

I just dont understand how the momentum answer is D?? To the best of my knowledge it is A?? Please explain.

 

[Beaconite007]

Here are some of the repeated questions
View attachment 13139View attachment 13140View attachment 13141View attachment 13142
View attachment 13143
1 A
2 A
3 A
4 D
5 D

they didnt change the option. i m right?????
were the q in exam 100% like this?????

 

[MOMO123123]

I just dont understand how the momentum answer is D?? To the best of my knowledge it is A?? Please explain.

before: they r moving towards each other
after: both r moving to the right
take right as positive:
relative speeds of spproach = relative speeds of seperation
u1-(-u2)=-(v1-v2)
u1+u2=-v1+v2
option D: u1+u2=v2-v1

 

[Arslanjaved]

speed=3x10^8,
total d=150x2=300m
t=d/s
300/3x10^8=1x10^-6 s

i guess they didn't ask about the time that the light takes to reach the eyes, they were just talking about the time to reach the wall