Physics Help Needed

[abcde]

AOA!
In question 8 OR (b) of this paper: http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_2.pdf
, I wrote: " To measure the humidity of the air". Is it correct? If not, can anyone give me other suggestions for the use of this circuit?
Please reply asap! Thank you!

 

[Nibz]

W.S
Yes, correct!
or better => To detect rainfall!

 

[Preceptor]

The Questions asks "State One use for this simple moisture detector?"

The Marking scheme states like this

(b) any sensible suggestion, e.g., warning of rain (not water level for the blind,
not automatic pump/windscreen wipers etc.)

I personally think that humidity should score the mark. because it same as saying "warning of rain". Humidity is the amount of moisture in the air , so when humidity increase, the circuit gets completed, the transistors start working, the bulb lights up.

 

[saleena]

Thats right

 

[abcde]

I thought the same but the e.r. states " Very few candidates suggested a suitable use for the moisture detector; several candidates stated that it could be used to switch on a pump or it could measure moisture levels. The device referred to in the question could do neither of these."
Now this clearly says that it cannot measure moisture levels or the humidity of the air! :S
So I think the best answer would be "to detect rainfall" as Nibz said.

 

[abcde]

What? what? what?

 

[SalmanPakRocks]

he is spaming !! :x

 

[VelaneDeBeaute]

he is spaming !! :x

@mods..
can't any1 block these SPAMS...
they r getting everywhere...!! :evil:

 

[SalmanPakRocks]

he is spaming !! :x

@mods..
can't any1 block these SPAMS...
they r getting everywhere...!! :evil:

already removed !!

 

[CaptainDanger]

What????????? Salman?????? Kya tha?

 

[leosco1995]

There was just some random person spamming and posting crap messages. The message got deleted now.

 

[CaptainDanger]

Oh alright... GOOD!

 

[SalmanPakRocks]

There was just some random person spamming and posting crap messages. The message got deleted now.

yeah the guy was filling every post with spam !!

 

[CaptainDanger]

Name?

 

[SalmanPakRocks]

I dunno it was a strange name !!

 

[abcde]

Some thing like Peep...wax

 

[SalmanPakRocks]

yeah !! but lets get on topic again !!

 

[VelaneDeBeaute]

Ah there u go...SALMAN is going back to topic...GR8 improvement...!! :lol:

 

[CaptainDanger]

Haha!

 

[VelaneDeBeaute]

@captain...i hope salman wouldnt mind me saying that...!!Sumtimes he gets quite angry..!! :shock: