Physics MCQs thread.

[Octahedral]

The ans is B but i dont get it :%)

 

[libra94]

R1 is same as R2 cuz same forces are needed to lift the weight up!
andT1 is more than T2 cuz T1 is shorter, so as distance decreaese the force increases

 

[cocospaniel]

The ans is B but i dont get it :%)

The normal contact force is the same. But since the wire is shorter, there will be more tension, so T1>T2.

 

[arlery]

http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w09_qp_11.pdf

Q : 17

Since both are at the same temperature, hence their molecules will move with the same velocities. Therefore, their kinetic energies are same.

 

[DeathDealer]

I Thought da SAME
buh yaaaWr " cocospaniel " Any Strong REAZ()N fo dis plzzzzzzzz !

 

[cocospaniel]

I Thought da SAME
buh yaaaWr " cocospaniel " Any Strong REAZ()N fo dis plzzzzzzzz !

Look at the post above yours

 

[Octahedral]

The ans is D.how do i get it?

 

[libra94]

The ans is D.how do i get it?

no the answer is B

 

[cocospaniel]

The ans is D.how do i get it?

Use radius not diameter, so 100/2 = 50 mm
Torque= Fd
F(tension)=3/(50*10^-3) and you get 60N


Then use the same formula but with 150/2
Torque= 60* 75*10^-3=4.5

Answer is D

 

[Octahedral]

@ libra94 no the ans is D i checked in the marking scheme

 

[Octahedral]

Please explain this the ans is D but im not getting it

 

[DeathDealer]

http://www.xtremepapers.me/CIE/Internat ... _qp_11.pdf
QUESTION 5 !!
Ufffffffffff..........tryd AwLMOSt mo dn 10 tyme buh ma Ans iz 2mscm^-1 tch
Plzzzzzz Some1 Help me

 

[DeathDealer]

AZWEL AZ QUESTION 20 ?
y itx D ? yaaaaaaaaaaaaaWR

http://www.xtremepapers.me/CIE/Internat ... _qp_11.pdf

 

[libra94]

@octahedral
m1v1 = m2v2
2*2 = 1 v2
u'll get v2 as 4ms-1
then 1/2 mv^2
1/2*2*2^2 + 1/2 * 1*4^2 = 12J

 

[Octahedral]

The ans is C how? :%)

 

[arlery]

at 100% power 2500 V

so at 80% power, voltage is 20000V

P =VI
So I = 4 X 10^6/20000
= 200 A

 

[Arshiful]

some one please explain me this urgent please in details

 

[arlery]

Is the answer A?

 

[DeathDealer]

Guyx Q:5 n Q:20 plzzz yaaaaaWR

http://www.xtremepapers.me/CIE/Internat ... _qp_11.pdf

 

[cocospaniel]

The ans is C how? :%)

Effiency= 80 = 4*10^6/power input * 100
THerefore power input is 5MW

Power is Volt * current

5MW/25kV= 200 A

THe answer is C