Biology; Chemistry; Physics: Post your doubts here!

[DaniyalK]

but why? why is it used

A jockey is used to connect a resistance wire to a circuit. Look at question 4 of w02_qp4.

 

[Maganius]

funky brat

 

[Mahnoorfatima]

In order to increase the accuracy of the results in thermometers and temperatures, can't we say using a sensitive thermometer or using a larger scale of reading? Why is it wrong to say so??

 

[Dark Destination]

What do we need to know about capacitors, diodes and LEDS, and rectifiers?

And what are these N-p-n transistors or bistable circuits stuff. .-.
Can someone explain

 

[Dark Destination]

In order to increase the accuracy of the results in thermometers and temperatures, can't we say using a sensitive thermometer or using a larger scale of reading? Why is it wrong to say so??

That sensitivity point is correct.. i think, but not the range one!

You can say avoid parallax error, by looking perpendicularly to the reading.

 

[exploded diper]

conguctors cannot be charged by friction becuz the electros can move through thm and rearrange thm self...?is this correct....

 

[Maganius]

In order to increase the accuracy of the results in thermometers and temperatures, can't we say using a sensitive thermometer or using a larger scale of reading? Why is it wrong to say so??

You can also include how much should It be immersed in the the apparatus, that it shouldn't touch the bottom or beaker or be immersed in the liquid which might give us wrong reading 'cause there might be few impurities present in the liquid.

 

[Mahnoorfatima]

That sensitivity point is correct.. i think, but not the range one!

You can say avoid parallax error, by looking perpendicularly to the reading.

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_42.pdf
check out qs1 part e both are wrong

 

[Dark Destination]

conguctors cannot be charged by friction becuz the electros can move through thm and rearrange thm self...?is this correct....

Yeah, i think. To charge a conductor, you need to induce charges and then earth or something

 

[Maganius]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_42.pdf
check out qs1 part e both are wrong

2nd and 5th options are correct

 

[Dark Destination]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_42.pdf
check out qs1 part e both are wrong

Yeah, because in this case TEMPERATURE is not the property being measured. The time is being measured.
We just need to measure temperatures like 54, and stuff, we don't need to go into accuracy with temperature.
We just need accurate results for the time taken for the oil to flow through funnel..

 

[Tuba noor]

Which question?

question 4 part a

 

[Fate0]

can u explain which of the instruments have u used other than the newton meter

red one's the string.
pink's a clamp.
black's a pulley.
the other are different loads.

 

[Fate0]

question 4 part a

Two methods.
One is plotting the magnetic field by compass. The magnet which has more magnetic field lines is stronger.
Second: Attach a number of paper clips to the compass. The magnet which attracts more paper clips is stronger.

 

[Maganius]

question 4 part a

Isn't the diagram given in the Mark Scheme?

Apparatus: Clamp stand, thin cotton, iron bar, magnet, newton meter

Explanation:

The Iron Bar is tightened in the clamp stand and the magnet A is suspended vertically from the newton meter using a cotton loop. The magnetic pole at the lower end of the the magnet A is placed in contact with the iron bar and the newton meter is pulled slowly upwards. Note down the reading shown on the newton meter just before it is detached from the iron bar.
Repeat the above steps with the magnet B and compare the readings of the newton meter. The magnet which produces the larger reading on the newton meter is the strongest magnet.

 

[Tuba noor]

Isn't the diagram given in the Mark Scheme?

Apparatus: Clamp stand, thin cotton, iron bar, magnet, newton meter

Explanation:

The Iron Bar is tightened in the clamp stand and the magnet A is suspended vertically from the newton meter using a cotton loop. The magnetic pole at the lower end of the the magnet A is placed in contact with the iron bar and the newton meter is pulled slowly upwards. Note down the reading shown on the newton meter just before it is detached from the iron bar.
Repeat the above steps with the magnet B and compare the readings of the newton meter. The magnet which produces the larger reading on the newton meter is the strongest magnet.

no there is no diagram given in mark scheme .
btw thanku

 

[Maganius]

no there is no diagram given in mark scheme .
btw thanku

ok wait
I'll draw to draw one in paint and send it to you
gimme few mins

 

[Tuba noor]

ok wait
I'll draw to draw one in paint and send it to you
gimme few mins

thanku for itni mehnat

 

[Tuba noor]

sure am waitng

 

[Maganius]

sure am waitng