Physics MCQ help.

[Hello111]

I am confused with a question and need help. I would also be glad to help if anyone else has problem with any other question. Just paste your question in the thread.

My Question: A mass of liquid of density p is thoroughly mixed with an equal mass of another liquid of density 2p. No change in volume occurs. What is the density of the liquid mixture??

 

[Hello111]

Anyone??

 

[Hello111]

http://www.xtremepapers.me/CIE/Internat ... 2_qp_1.pdf

Question 34 and 21

 

[Hello111]

Nevermind. I figured Q 21 myself. I still need help with Q34.

 

[generalsZH]

34 is a simple question. U see that in both diagram same combination i.e PQRS. In both diagram the batter or power supply is connected which is in parallel combination. so no difference they ve same normal brightness.
(Are u appearing in AS or AS/A2?)

 

[DeathDealer]

http://www.xtremepapers.me/CIE/Internat ... _qp_12.pdf

QUESTION 13 ?
Any1 !

 

[DeathDealer]

AZWEL AZ QUESTION 22 ?

http://www.xtremepapers.me/CIE/Internat ... _qp_12.pdf

 

[Hello111]

@generalsZH: Thanks. I wanted to know what actually effects the brightness of the lamps which have constant resistance? Is it only voltage or only current or both?

I am giving As/A2. You??

 

[generalsZH]

Since source is battery(emf) and the combination is parallel so ofcorse in parallel voltage is same.

m also AS/A2. Its a simple trick just remember the parallel and series combination and u wil automatically understand..

 

[Rockstar3143]

Q1 done(the one u asked at the top)
the density of mixture = 4p/3.
the volume of first= m/p
the volume of second=m/2p.
total volume =3m/2p
total mass=2m
density of mixture=2m/(3m/2p)=4p/3.

hope it helps^^^..

 

[generalsZH]

Since source is battery(emf) and the combination is parallel so ofcorse in parallel voltage is same.

m also AS/A2. Its a simple trick just remember the parallel and series combination and u wil automatically understand..

 

[Hello111]

@generalsZH: Yeah, I understand it. But what I am now asking is not the question. It's completely outside the question.

I want to know what effects the brightness of the lamp. Is it only voltage or only current or both?

 

[Hello111]

@Deathdealer: Question 13 is easy. The gravitational pull does not change when the object is immersed.

You can also eliminate other options.
A is incorrect because the balance reading will not reduce as the upthrust is the same.
B is incorrect because the balance reading is weight - upthrust (not upthrust)
C is incorrect because the the forces acting on the horizontal side cause the upthrust (not the forces on the horizontal sides of the cube)