AS Physics P1 MCQs Preparation Thread.

[SomeStudent]

Someone explain why B isnt correct and D is?

 

[SomeStudent]

please explain these two!

 

[ashoo123]

Someone explain why B isnt correct and D is?
View attachment 45287

When diameter decreases, R increases, V also increases since current is constant
V=IR
That explains why D is correct

 

[SomeStudent]

When diameter decreases, R increases, V also increases since current is constant
V=IR
That explains why D is correct

Oh okay! Thanks!

 

[SomeStudent]

 

[ashoo123]

please explain these two!View attachment 45289 View attachment 45288

Do u take mechanics?? It would make the explanation for the other q easier

 

[SomeStudent]

yup. I do!

 

[SomeStudent]

And last one

Q To determine the mass of food in a pan, a scale is used that has high sensitivity for small masses
but low sensitivity for large masses.

To do this, two springs are used, each with a different spring constant k. One of the springs has a
low spring constant and the other has a high spring constant.

Which arrangement of springs would be suitable?

 

[ashoo123]

please explain these two!View attachment 45289 View attachment 45288

yup. I do!

Resolve forces for the man and barrel, solve simultaneously and u will get a=2 ms-2
Distance is 9m as they will meet midway
So for the man s=9 u=0 v=? a=2
v^2 = u^2 + 2as
v = sq rt(2*2*9)
Hence v=6
Answer ---> A

 

[ashoo123]

View attachment 45290

This question ought to have taken a very brief time to answer correctly. A cannot be correct because the particle is still going in the initial direction. In B it stops and in D it must have undergone an elastic (not an inelastic) collision. C, the correct answer was chosen by only 11% of candidates.

This is from the er...hope it helps

 

[ashoo123]

please explain these two!View attachment 45289 View attachment 45288

This is for the first q...Sry, the answers are in a very messed up fashion...

Since it is vaccum, a= g= 10 ms-2
u=0 a=10 t=0.5T s=?
s= ut+0.5at^2
s= 5/4(T^2)

But dont panic that there is no such option, and tht it doesnt make sense..Since it is in terms of T find s for T as well
s=5T^2

For the whole time it is 5, and for half it is 5/4...so distance is 1/4th the total! Ans: B
Hope that makes sense!!

 

[SomeStudent]

This is for the first q...Sry, the answers are in a very messed up fashion...

Since it is vaccum, a= g= 10 ms-2
u=0 a=10 t=0.5T s=?
s= ut+0.5at^2
s= 5/4(T^2)

But dont panic that there is no such option, and tht it doesnt make sense..Since it is in terms of T find s for T as well
s=5T^2

For the whole time it is 5, and for half it is 5/4...so distance is 1/4th the total! Ans: B
Hope that makes sense!!

Hehe, thank you SO much for all your help! Meant a lot

 

[ashoo123]

Hehe, thank you SO much for all your help! Meant a lot

No problemss..I just hope u got to see it before the exam
How was it anywayss?

 

[SomeStudent]

No problemss..I just hope u got to see it before the exam
How was it anywayss?

Oh yes, it wasnt a problem at all
Not that good. I messed up my time management and had to tick off some MCQS without reading.
But idec, seriously. I am just glad its over. How was yours?

 

[mushu.jr]

Nov 15 p13 qn15 urgent help pls

 

[hellodjfos;s'ff]

Nov 15 p13 qn15 urgent help pls

Take O as your pivot. Since the structure is in equilibrium, the anticlockwise moments=clockwise moments.
3(2)+4(0)+4(2sin30)=F(5) -----> 6+4=5F -----> F=2N(B)
The 4N force has not moment because there is no perpendicular distance from it's line of force to the pivot.

 

[Ayesha_m01]

can someone explain me how C is the answer

 

[Mr."S"]

View attachment 64136 can someone explain me how C is the answer