Physics ATP Problems

[Usman17]

Hey guyz... Can any1 please xplain Nov 05 Q 4 Part (a) to me with good reasoning... I cant understand the redspot answer :O :O... Thnxxx

 

[abcde]

The link please?

 

[KarachiRocker]

See. Volume = Area x Height. as the area is constant, the increase in height will also increase the volume of the gas. Got it ?

 

[Usman17]

DAMN It was so hell easy thnx alot karachirocker
And please also explain Q.3 a(ii) And b(i)
Here's the link: http://www.xtremepapers.me/CIE/Cambridg ... 5_qp_4.pdf

 

[CaptainDanger]

Q.3 a (ii)
Focal length for the lens is always same so it will not effect its value...

b(i) The rays are reflected back from the mirror... As they are reflected they again pass through LENS and are converged at the point on the CARD forming image....

 

[Usman17]

Hey Do we have to write the scale on the graph as well?

 

[abcde]

No, the scale isn't necessary.

 

[adnanj]

q3 anyone plz help
http://www.xtremepapers.me/CIE/Cambridg ... _qp_41.pdf

 

[ISCLHRTSR]

Q.3 a (ii)
Focal length for the lens is always same so it will not effect its value...

Wouldn't the focal length increase as now the image will be further off?

@Adnanj

For 3(a) You have to make a circuit consisting of the thermistor, a voltmeter and an ammeter [With these, you'll find Voltage and Current, and then use V=IR].

3(b) To heat use a water bath. To measure, simply use a thermometer and place it close to the thermistor.

3(c) Resistance must be measured at more than two instances so as to maintain accuracy and draw a line of best fit.

 

[CaptainDanger]

No... The same LENS are used... The measurement for focal length will remain same...

 

[Usman17]

@Captain: can u please xplain transistor to me ((((((((( I just cnat understand the flow of current and the effect of increasing or decreasing the resistance of the variable resistor on the whole circuit... :O

 

[CaptainDanger]

Transistor is mainly used as a switch.... It can amplify current or voltage....

When you increase the RESISTANCE of the resistor it means the current flow will decrease in the circuit(in case of LIGHT BULBS there brightness will decrease if the current is lower then the minimum requirement) and vice versa...

 

[Usman17]

I am posting a question will u xplain in detail to me ?

 

[Usman17]

Hey dude... The questions in redspots are NOWHERE to be found in the papers on xtreme :S specially the electronics questions... Where have the redspot taken those questions from ? :| Does this mean that these type questions wont be coming :S

 

[SAUD ASLAM]

yeah redspot makes us fool :evil:

 

[Usman17]

so what shud we do :S
I didnt use to see the answers in redspot but now i have to stop seeing the questions as well :O :S :S

 

[SAUD ASLAM]

yeah u have to.
Sometimes the whole qs is lost or sometimes pata nai kahan se a jata hai
MCqs mein bhi aisa hai

 

[izzahzainab]

redspot is from singapore. there, electronics is not optional

 

[Usman17]

Oh my God... :| that was not GooD!! :|

 

[CaptainDanger]

Yes you can post the question... Or tell the paper and year number?