Biology; Chemistry; Physics: Post your doubts here!

[FLRNAB]

Hey! i have a simple question that can you draw a expirement in extra space under the lines provided in physics and bio ?? because i did in bio atp.. it wont matter right? like the wont cut marks for that?
Thanks!

Yeah and you can also make marks/points on a diagram and refer to those points in your answer

 

[Dark Destination]

a) 1. rub polyethene rod with wool(charge attained on rod)
2.use electroscope(charge identifying device) and bring rod near to metal plate of electroscope
3. If the strip of electroscope rises , means rod was charged
b)1.set horse shoe shaped permanent magnet
2. use a circuit connected to a cell and use resistor in it (to avoid overheating)
3. attach an end of circuit wire (going between horse shoe magnet) to clamp stand
4. wire will rotate clockwise or anti clockwise depending on direction of force



attached it .. its very viral now


ofcourse you can. but include this : student A says "go" and drops paper, immediately student B starts stopwatch .. reaction times can differ
other answers: drop from same height, repeat, average.

Is Electroscope even a part of our syllabus? .-.

 

[FLRNAB]

Is Electroscope even a part of our syllabus? .-.

No but you can use it for an experiment. Different experiment showing charging by friction would be between a glass rods and ebonite rods rubbed by silk and fur respectively. One rod would hang while the other is brought near it. Like charges repel, Unlike charges attract.

 

[Dark Destination]

No but you can use it for an experiment. Easier experiment would be between a Glass rods and ebonite rods.

What experiments should we know for Physics atp?
Those that are in the book. Are they sufficient?

 

[FLRNAB]

What experiments should we know for Physics atp?
Those that are in the book. Are they sufficient?

Open the syllabus and Ctrl+F for experiments. Those are the ones you should know.

 

[princess Anu]

how do we read water and mercury meniscus ? like whats the difference

 

[princess Anu]

1 division on the sleeve scale of micrometer equals to how much mm? and that on the rotating scale?
and when do we take into note half division on the sleeve scale as well and include it in reading?

 

[funky brat]

Thanks!!
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s03_qp_4.pdf
q.2 part b(ii)

A small needle makes the compass more sensitive and can be used to detect weak magnetic field.

 

[funky brat]

Is it wrong if its horizontal? And thank you
Oh and one more question.
If the boiling water temperature is 103 but the thermometer reads 100...is it because of the steam loss?

The thermometer is reading the steam's temperature. The water is impure.

 

[Anonymous321]

how do we read water and mercury meniscus ? like whats the difference

Just remember, its the MIDDLE of the meniscus we read. With Mercury, the meniscus is at the top, while the water (and all other liquids) the meniscus is at the bottom. In fact, mercury is the only liquid (in our syllabus, at least) which has it's meniscus at the top.

 

[funky brat]

1 division on the sleeve scale of micrometer equals to how much mm? and that on the rotating scale?
and when do we take into note half division on the sleeve scale as well and include it in reading?

The sleeve scale reading is 0.5 mm.

 

[funky brat]

Is Electroscope even a part of our syllabus? .-.

No, it's not.

 

[funky brat]

a) 1. rub polyethene rod with wool(charge attained on rod)
2.use electroscope(charge identifying device) and bring rod near to metal plate of electroscope
3. If the strip of electroscope rises , means rod was charged

The electroscope already carries positive charge, isn't it?

 

[funky brat]

Awesome12
The issue of reaction time,late starting,early stopping and all the stuff exist when two people are used since both of them have different reaction times.
The best would be to drop it from a known height(shoulder level perhaps) and manipulate the stopwatch in your other hand. Reapeat thrice and take an average. This would be more accurate than using two people

Reaction time issue exists even when a single person is performing an experiment.

 

[princess Anu]

The sleeve scale reading is 0.5 mm.

half division ? or 1 division

 

[funky brat]

half division ? or 1 division

The sleeve is the half division, the main scale reads 1 mm.

 

[Awesome12]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s06_qp_4.pdf
Question 4 (a) (ii)
Can't I say measure using micrometer screw gauge or vernier calipers

 

[funky brat]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s06_qp_4.pdf
Question 4 (a) (ii)
Can't I say measure using micrometer screw gauge or vernier calipers

They are not asking about the device for measurement. It is just asking how would you make it more accurate. So you may write about parallex or zero error.

 

[Awesome12]

Could some on3 tell me are my graphs correct

 

[♣♠ Magnanimous ♣♠]

Could some on3 tell me are my graphs correct
View attachment 41402 View attachment 41403

i think for line of best fit your graph is accurate.