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secondary 4 | E Maths
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Hello, Manytutors if you see this there is an issue with uploading questions online for all subjects, hence have to ask it under "E math" (as app online has e and a math selection).
Can I know how to get B?
Date Posted: 3 years ago
Views: 328
Electronic balances typically have an accuracy of 0.01g (some even 0.0001g)
So a 4g measurement is no issue.
A typical topwatch has accuracy of 0.01s
So a 30s measurement is no issue.
So a 4g measurement is no issue.
A typical topwatch has accuracy of 0.01s
So a 30s measurement is no issue.
However, even though there are 20ml, 40ml, 60ml,80ml and 100ml markings on a 100ml beaker,
It won't be accurate as the smallest interval of measurement you can get is 10ml (the halfway point between the markings.
So even if you measure 20ml of liquid and fill it up to the respective line, it won't be accurate.
Typical beakers have a precision of ± 5% so for a 100ml beaker,
5% × 100ml = 5ml
A 20ml measurement means the actual volume measured could vary high as 25ml or as low as 15ml.
It won't be accurate as the smallest interval of measurement you can get is 10ml (the halfway point between the markings.
So even if you measure 20ml of liquid and fill it up to the respective line, it won't be accurate.
Typical beakers have a precision of ± 5% so for a 100ml beaker,
5% × 100ml = 5ml
A 20ml measurement means the actual volume measured could vary high as 25ml or as low as 15ml.
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Not really. There are 20ml, 40ml, 60ml,80ml and 100ml markings on it.
It's just that it won't be accurate
It's just that it won't be accurate
Depends on the beaker though.
And in some cases, the readings might be absent or “scratched off”.
One of my student’s calculator was scratched off so badly that the “digits” on the display become missing.
I had to “guess” by memory where the placement of the digits on that Casio fx 96 sg calculator were on.
And in some cases, the readings might be absent or “scratched off”.
One of my student’s calculator was scratched off so badly that the “digits” on the display become missing.
I had to “guess” by memory where the placement of the digits on that Casio fx 96 sg calculator were on.
That's funny.
We have a theoretical question here so quite obviously the beaker' markings are taken to be intact. We are also looking at a typical standard 100 ml beaker, where these markings are the standard.
We have a theoretical question here so quite obviously the beaker' markings are taken to be intact. We are also looking at a typical standard 100 ml beaker, where these markings are the standard.
If quality of measuring instruments have to be taken into consideration then the stopwatch and electronic balances' displays come into question as well.
i.e digits not displaying, blurred, screen cracked, liquid inside caused a smudge
Clearly that is not the point of the question.
i.e digits not displaying, blurred, screen cracked, liquid inside caused a smudge
Clearly that is not the point of the question.
Hehe.
It is ok. Beakers can have marking or no marking too. We may also say maybe there is one beaker giving high precision marking. Anyway, it is good to point out any point for student to think hard.
It is ok. Beakers can have marking or no marking too. We may also say maybe there is one beaker giving high precision marking. Anyway, it is good to point out any point for student to think hard.
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