Biology; Chemistry; Physics: Post your doubts here!

[Awesome12]

117for me ...I was confused when it was of 1 mark?
Wht abtr tht efficiency question wht do u reckon wud be th 2 marks/2 points?

I don't think we had to subtract anything. Afterall it was for only a mark, and I think there would have been a mark reserved for the subtraction, making it a 2 mark question.

I wrote percentage of input energy converted in to useful output energy, and also mentioned the formula

 

[M.Omar]

I wrote that it is a percentage that tells how much how much input energy is converted to useful output energy.

well, ia m talking abt the 2 pts...For me percentage useful energy/raw input power 2.wrote the formual..3.Thus tells the usefulness of a particular system
Coz MS esp of oct 2013 are strict abt definitions and 2 marks implies for mr two distinct poin ts :|

 

[asadalam]

It was a 1 mark Q so i didnt subtract though

 

[M.Omar]

I don't think we had to subtract anything. Afterall it was for only a mark, and I think there would have been a mark reserved for the subtraction, making it a 2 mark question.

I wrote percentage of input energy converted in to useful output energy, and also mentioned the formula

Yeah thts wht baffledme..But looking at the wording we cant simply deny the possibility on pretext it,s a 1 mark..It said increased by F...Wht abt the refractive index question tht was quite tough to make a link...

 

[Abdul Hanan]

117for me ...I was confused when it was of 1 mark?
Wht abtr tht efficiency question wht do u reckon wud be th 2 marks/2 points?

for efficiency you had to write i think
"the ratio of useful output power over total input"
where power i think carry one mark

 

[M.Omar]

for efficiency you had to write i think
"the ration of useful output power over total input"
where power i think carry one mark

it cud be power or energy but yeah I get wht u mean by 2 pts .Power and ratio .Isn,t it a percentage we had to write tht as well?tht is multiplying by 100%
did any one attempted question 3 sec B..Wht was change in graph of resistor compared to filament and how was the graph exactly of filament lamp dir prop straight line and 12V corr 0.25 A right?

 

[Abdul Hanan]

it cud be power or energy but yeah I get wht u mean by 2 pts .Power and ratio .Isn,t it a percentage we had to write tht as well?tht is multiplying by 100%
did any one attempted question 3 sec B..Wht was change in graph of resistor compared to filament and how was the graph exactly of filament lamp dir prop straight line and 12V corr 0.25 A right?

it said to define "efficiency"
not "percentage efficiency"
i think

 

[Awesome12]

for efficiency you had to write i think
"the ratio of useful output power over total input"
where power i think carry one mark

I think the marks weer divided like this

......................Useful power ouput
Efficiency =-------------------------
.............................Input power

One mark for mentioning the output/input power, and the other for 'useful'

 

[DaniyalK]

I don't think you had to subtract anything. The liquid molecules are always exerting a force on the large piston. Therefore, the force exerted by pulling the lever WAS the additional force or increase in force.

 

[Awesome12]

In the MCQs, there was a cooling curve about the hot liquid, what did you chose for that?

 

[DaniyalK]

In the MCQs, there was a cooling curve about the hot liquid, what did you chose for that?

Solidification and evaporation.

 

[Abdul Hanan]

I think the marks weer divided like this

......................Useful power ouput
Efficiency =-------------------------
.............................Input power

One mark for mentioning the output/input power, and the other for 'useful'

exactly

 

[Abdul Hanan]

guys we did had to subtract as it said "F is the increase in force"
166 was the total force
116 becomes increase in force

 

[Awesome12]

Solidification and evaporation.

Attaboy

 

[hanzallah]

Answer of pressure vs depth graph in MCQ's???

 

[DaniyalK]

guys we did had to subtract as it said "F is the increase in force"
166 was the total force
116 becomes increase in force

166N wasn't the total force. It was the force exerted due to the pressure of 33.3 Pa in the liquid.

 

[asadalam]

The answer to one of them was loudspeaker,and the resistance of codes was 200 and the block had friction exerting equal force to the right...right?

 

[Awesome12]

Answer of pressure vs depth graph in MCQ's???

A straight line (linear graph) that did not start from the origin

 

[Ram97]

In the red and blue light one what did we had to write??
MCQ about thermometer sensitivity

 

[asadalam]

Answer of pressure vs depth graph in MCQ's???

B.Straight line above origin