Q&A - P3 Science

[Joy]

hello


thanks for the answer.really appreciate it.


cheers

atutor2001:

Joy:

Hello all

Can I just post one mcq before my girl exam which is tomolo?

Su placed a bag of ice cubes weighting 58g on an electronic scales.what will the reading on the scale be when all the ice cubes in the bag has melted.
1exactly 58g
2slightly less than 58g
3 slightly more than 58g
4 not possible to tell/.

ans given is 3

can someone explain.thanks

Hi Joy

The answer is 3 because water vapour from the surrounding air will condense on the external surface of the bag. This additional water will increase the weight indicated on the weighing scale. :lol:

[elkniwt]

atutor2001:

Hi elkniwt

I share the same answer as your daughter. I think there is printing error in the answer key.

Hi atutor2001,

Thanks for your help!! My dd is very happy when I tell her that. :lol:

[elkniwt]

Hi,


Another qn :

In which of these objects can magnets be found?

A piano
B stapler
C telephone
D refrigerator

1) A and B only
2) C and D only
3) B, C and D only
4) A, C and D only

Ans key is 3. But do you have magnet in stapler ?? :? Please advise.

[Full.010894Cream]

stapler?


I’m not even sure abt telephone…if they are referring to the ear/mouth piece, think these are piezoelectric stuff.

[atutor2001]

elkniwt:

Hi,


Another qn :

In which of these objects can magnets be found?

A piano
B stapler
C telephone
D refrigerator

1) A and B only
2) C and D only
3) B, C and D only
4) A, C and D only

Ans key is 3. But do you have magnet in stapler ?? :? Please advise.

Hi elkniwt

Thank you for the question. I learn something new today. I googled and found the write-up below. Latest stapler do come with magnet.
[quote]A regular stapler includes a base, a staple magazine, and a handle which are hinged for pivotal motion and wherein staples are pushed forward by a spring. Other types of stapler employ a magnet which has a similar function as a spring. Themagnet draws the staples beneath the staple ejector provided on the handle. In this type of stapler, the magnet must be securely attached to the stapler; however, occasionally the magnet occasionally comes off of the stapler, causing the stapler to stopfunctioning stapling operation.[/quote]

[acforfamily]

atutor2001:

elkniwt:

In which of these objects can magnets be found?

Thank you for the question. I learn something new today. I googled and found the write-up below. Latest stapler do come with magnet.

I really do not understand why schools ask such questions which are not common (or maybe I am a mountain tortoise?). If the purpose is to understand a concept, why can't they use common items? If we adults don't even know, how do we expect 9 - 10 year olds to know?
Sorry for ranting but the school questions do get me sometimes.

[smarty]

elkniwt:

Hi,


Another qn :

In which of these objects can magnets be found?

A piano
B stapler
C telephone
D refrigerator

1) A and B only
2) C and D only
3) B, C and D only
4) A, C and D only

Ans key is 3. But do you have magnet in stapler ?? :? Please advise.

Hi I am a p3 student. from wat i think, stapler does not have magnetsz

[elkniwt]

atutor2001:

Hi elkniwt

Thank you for the question. I learn something new today. I googled and found the write-up below. Latest stapler do come with magnet.
[quote]A regular stapler includes a base, a staple magazine, and a handle which are hinged for pivotal motion and wherein staples are pushed forward by a spring. Other types of stapler employ a magnet which has a similar function as a spring. Themagnet draws the staples beneath the staple ejector provided on the handle. In this type of stapler, the magnet must be securely attached to the stapler; however, occasionally the magnet occasionally comes off of the stapler, causing the stapler to stopfunctioning stapling operation.

[/quote]Thanks atutor2001 for the info!! :salute:

[watmekiasu]

But one of my stapler does have a magnetic catch.


The expected answer is C and D. Pianos do not have magnets.

[elkniwt]

acforfamily:

I really do not understand why schools ask such questions which are not common (or maybe I am a mountain tortoise?). If the purpose is to understand a concept, why can't they use common items? If we adults don't even know, how do we expect 9 - 10 year olds to know?
Sorry for ranting but the school questions do get me sometimes.

Hi acforfamily,

I wholeheartedly agree with you. Common staplers do not come with magnets. Even adults like me, (guess must be very out-dated) have not seen staplers with magnets, what to expect of the little ones. :roll: