AS Physics P1 MCQs Preparation Thread.

[Wanzi21]

it is already solved.check the mcq yearly thread

ohh from this thread??

 

[oldfashionedgirl]

View attachment 12948

View attachment 12949

can u explain these?? the answers are 10.C and 13.B

For question 13, the 900N force and the force 'F' are acting in opposite directions so you'll have to equate their equations. Now the force of 900N is acting at a distance of 0.2m from the centre of the disc (consider it the pivot). So the equation for its moment of force will be = 900 x 0.2
The forces 'F' form a couple, so you'll have to take the total distance between the which is 1.2m and multiply it with 'F'. Now equating the equations you'll get:

900 x 0.2 = F x 1.2

Solve it and you'll get F = 150N

 

[USMAN Sheikh]

u can solve this with the help of trigonometric ratios

kindly explain plssss :'(

 

[oldfashionedgirl]

fr this 1 find the force so it will be F(frictional force)+200sin30=250
then find the distance moved by the box in the slope.sin30=1.5/h.u will get 3.then apply the formula w=f*s.250*3=750

Thanks alot!

 

[Peter Check]

when two values are added or sbtracted, then the uncertainties are always added so 0.02+0.03= 0.05

they so told to find the uncertainity so add o.3+0.2=0.5 so the ans is d

Then why is the answer not 0.01+0.01+0.01+0.1 for this one???

 

[malik234]

m/j/09/01
mcq no. 2 ,10,11 n 14
plzzzzzzzzzzzzzzzz anyone !

 

[USMAN Sheikh]

malik234 pl bro help meee not getting it plssssss waiting for complete solutions pls man

 

[malik234]

Then why is the answer not 0.01+0.01+0.01+0.1 for this one???
View attachment 12950

remember here the quantities are not added, to find density we use the formula density=mass/volume
so here the fractional uncertainties are added

 

[Wanzi21]

For question 13, the 900N force and the force 'F' are acting in opposite directions so you'll have to equate their equations. Now the force of 900N is acting at a distance of 0.2m from the centre of the disc (consider it the pivot). So the equation for its moment of force will be = 900 x 0.2
The forces 'F' form a couple, so you'll have to take the total distance between the which is 1.2m and multiply it with 'F'. Now equating the equations you'll get:

900 x 0.2 = F x 1.2

Solve it and you'll get F = 150N

thank you ^^ really helpful

 

[XPFMember]

Then why is the answer not 0.01+0.01+0.01+0.1 for this one???
View attachment 12950

in this case..they are divided / multiplied...so it's the fractional uncertainty that will be added...and then we calculate the uncertainty from that..

 

[malik234]

malik234 pl bro help meee not getting it plssssss waiting for complete solutions pls man

see, if u take the forces the other side, then w will be the perpendicular, f will be the base, then u can apply, tan= f/w i.e base over perpendicular

 

[KJS98097090]

Listen guys, what is conserved in a nuclear reaction and what isn't?
PLEASE HELP I"M REALLY CONFUSED

 

[Tkp]

welcome

Thanks alot!

.can u help me with mj11 2,29

 

[A.ELWY 7]

Listen guys, what is conserved in a nuclear reaction and what isn't?
PLEASE HELP I"M REALLY CONFUSED

Mass, energy... nucleon number, momentum

 

[XPFMember]

Listen guys, what is conserved in a nuclear reaction and what isn't?
PLEASE HELP I"M REALLY CONFUSED

energy, nucleon number, number of protons is conserved.

Number of neutrons is NOT conserved....

 

[oldfashionedgirl]

Listen guys, what is conserved in a nuclear reaction and what isn't?
PLEASE HELP I"M REALLY CONFUSED

Everything except the number of neutrons is conserved.

 

[Soldier313]

Can someone please explain this?
ans is C

 

[oldfashionedgirl]

welcome

.can u help me with mj11 2,29

which variant?

 

[Gémeaux]

oh sorry i mixed it up with some other mcq, didn't read all..

s= ut + 1/2 at ^2 , total distance = 80 m , u will be zero, time is 18 seconds,

80= 1/2 into a into 324 , 80/162 = .49 ms^-2

The answer's 0.37m/s^2

 

[A.ELWY 7]

Can someone please explain this?
ans is C

View attachment 12951

the size of the arrows shows the magnitude of the force..W have the smallest arrow..then H is a bit larger than W and t is the greatest so C