Q&A - P3 Science

[Concerndad]

Hi…


Both the answer key n your daughter is right…

We must help our children to understand certain differences between test/exam qns compared with facts given in science guide…

The test qns is testing the child knowledge of the characteristic of living things. Hence we must answer according. In fact…eventually the beetle will still die to lack of food.

One thing, we can learn from here, is the time factor involve in the qns…if the qns does not give a time limit…like eg. Within a day…or a few day…or a few hours later…then we can give the answer as the beetle would die. But otherwise, we must answer it as…the beetle will still live because living thing can survive for awhile without food.

[Champion]

Concerndad:

One thing, we can learn from here, is the time factor involve in the qns..if the qns does not give a time limit...like eg. Within a day..or a few day..or a few hours later...then we can give the answer as the beetle would die. But otherwise, we must answer it as...the beetle will still live because living thing can survive for awhile without food.

Hi Concerndad,
Thanks so much for your analysis; appreciates much :thankyou:

But looking back to the question, the statement before it, \"After one week, he noticed that the beetle had died.\" This was the tricky part that my DD1 \"challenged\" me :scared:

[Concerndad]

Oops..missed out on that statement...paiseh :imsorry:


I have made a check..your daughter is right..a beetle can survive without food for 3weeks.

Hence there may be a flaw in the qns itself...

Hope this help.

[Champion]

Concerndad:

Oops..missed out on that statement...paiseh :imsorry:


I have made a check..your daughter is right..a beetle can survive without food for 3weeks.

Hence there may be a flaw in the qns itself...

Hope this help.

Hi Concerndad,
Once again; :thankyou: very much for your explanation :hi5:

[teh_oh]

Hi parents,

Referring to Conquer Science 3/4 Question,
Q) Study the classification table below:
Materials
Magnetic Metals - iron nail, steel screw, nickel coin
Non-magnetic Metals - aluminium foil, brass fixture, gold ring
Which of the following has been placed in the wrong category?
1) aluminium foil
2) nickel coin
3) brass fixture
4) gold ring
Answer Key: (3)

Q1) Is brass magnetic or non-magnetic metal?
Wiki state that brass is not ferromagnetic. In that case brass fixture is in the correct category above, so is the answer in the answer key above wrong?

According to EPH Ultimate Science page 473, it is stated
"All non-metals are non-magnetic, such as plastics, paper, clay, brass, water etc".
Q2) Is brass metal or non-metals???
Wiki state that it is a metal.

Appreciate any help.

[atutor2001]

teh_oh:

Hi parents,

Referring to Conquer Science 3/4 Question,
Q) Study the classification table below:
Materials
Magnetic Metals - iron nail, steel screw, nickel coin
Non-magnetic Metals - aluminium foil, brass fixture, gold ring
Which of the following has been placed in the wrong category?
1) aluminium foil
2) nickel coin
3) brass fixture
4) gold ring
Answer Key: (3)

Q1) Is brass magnetic or non-magnetic metal?
Wiki state that brass is not ferromagnetic. In that case brass fixture is in the correct category above, so is the answer in the answer key above wrong?

According to EPH Ultimate Science page 473, it is stated
\"All non-metals are non-magnetic, such as plastics, paper, clay, brass, water etc\".
Q2) Is brass metal or non-metals????
Wiki state that it is a metal.

Appreciate any help.

To answer your questions first :
Q1 Brass is non-magnetic as it does not contain any magnetic element (a mixture (alloy) of copper & zinc)
Q2 Brass is a metal.

It is NOT true that all non-metals are non-magnetic. Carbon is a non-metal but it is magnetic and it also can conduct electricity.

I believe that the answer (3) is correct. The main classification should be magnetic & non-magnetic. It should then branch into \"Element\" and \"Alloy\". There are 2 alloys in the list, steel and brass. Brass must have been placed together with aluminium & gold - it should be under alloy.

If steel is placed in the same group as iron and nickel, then there is mistake in the question. Steel should be in a separate group under \"magnetic\"

[teh_oh]

atutor2001:

teh_oh:

Hi parents,

Referring to Conquer Science 3/4 Question,
Q) Study the classification table below:
Materials
Magnetic Metals - iron nail, steel screw, nickel coin
Non-magnetic Metals - aluminium foil, brass fixture, gold ring
Which of the following has been placed in the wrong category?
1) aluminium foil
2) nickel coin
3) brass fixture
4) gold ring
Answer Key: (3)

Q1) Is brass magnetic or non-magnetic metal?
Wiki state that brass is not ferromagnetic. In that case brass fixture is in the correct category above, so is the answer in the answer key above wrong?

According to EPH Ultimate Science page 473, it is stated
\"All non-metals are non-magnetic, such as plastics, paper, clay, brass, water etc\".
Q2) Is brass metal or non-metals????
Wiki state that it is a metal.

Appreciate any help.

To answer your questions first :
Q1 Brass is non-magnetic as it does not contain any magnetic element (a mixture (alloy) of copper & zinc)
Q2 Brass is a metal.

It is NOT true that all non-metals are non-magnetic. Carbon is a non-metal but it is magnetic and it also can conduct electricity.

I believe that the answer (3) is correct. The main classification should be magnetic & non-magnetic. It should then branch into \"Element\" and \"Alloy\". There are 2 alloys in the list, steel and brass. Brass must have been placed together with aluminium & gold - it should be under alloy.

If steel is placed in the same group as iron and nickel, then there is mistake in the question. Steel should be in a separate group under \"magnetic\"

Hi atutor2001,
Thanks for the information.
But can you please explain again why the answer state that 'Brass Fixture' has been placed in the wrong category if it is non-magnetic?
Thank you.

[teh_oh]

Hi parents,

For parents with children using SAP's Science Partners guide, we spotted 2 'errors' in Magnets section.

http://i53.tinypic.com/5nt9qp.jpg\">
S-pole of button magnet should be on the underside (see our arrow).

http://i52.tinypic.com/fbb4b7.jpg\">
We think it should be, \"The train and track has like poles, so magnetic repulsion occurs....\"

Please correct me if I am wrong. Thank you.

[teh_oh]

Hi parents,

Sorry to trouble again. As both my husband and I are not good in primary school syllabus, we hereby seek your assistance again.

http://i54.tinypic.com/2m29vrs.jpg\">
In the above, the iron nail becomes a temporary magnet when it comes in contact with the magnet, hence it is able to attract the paperclips.
http://i54.tinypic.com/2bob5x.jpg\">
Why didn't that surface of the iron tank that is in contact with the magnet, have temporary magnetism through 'induction' (as in the first diagram) to attract the steel ball bearing?

Thank you in advance for your assistance.

[atutor2001]

teh_oh:

Hi atutor2001,
Thanks for the information.
But can you please explain again why the answer state that 'Brass Fixture' has been placed in the wrong category if it is non-magnetic?
Thank you.

Hi teh_oh

I need to clarify on whether were the magnetic materials being printed in the question as 1 single group or were they being broken up into 2 groups, namely : iron & nickel placed together and the steel screw being placed separately, under a different column. If it is so, then (3) is correct as the main-classification is \"magnetic & non-magnetic\". The items are then sub-classified into \"Element (consist of 1 type of metal)\" and \"Alloy (mixture of metals)\".

However, if all the magnetic materials are presented in the chart as a single group (column), then there is something wrong with the question.