Q&A - P4 Science

[verykiasumummy]

Jamesbond:

http://i48.tinypic.com/35lrdj9.jpg\">


what could be the answer for this.....Answer in the paper says just in one line...They are made up of diff materials.

But my son says should explain as follows:

For container R, It is a good conductor of heat and hence lost heat quickly. And for container S, It is a poor conductor of heat and hence lost heat slowly...

I feel this way of answering is correct...

Pl let me know which is better and why?

Thx..

offering my answer :

the 2 containers are made of different material, hence they have different conductivity of heat, which cause them to cool down at different timing.

[Jamesbond]

verykiasumummy:

Jamesbond:

http://i48.tinypic.com/35lrdj9.jpg\">


what could be the answer for this.....Answer in the paper says just in one line...They are made up of diff materials.

But my son says should explain as follows:

For container R, It is a good conductor of heat and hence lost heat quickly. And for container S, It is a poor conductor of heat and hence lost heat slowly...

I feel this way of answering is correct...

Pl let me know which is better and why?

Thx..

offering my answer :

the 2 containers are made of different material, hence they have different conductivity of heat, which cause them to cool down at different timing.

Thank you....

[verykiasumummy]

Jamesbond:

Thank you....

welcome...

[Jamesbond]

http://i46.tinypic.com/slpws9.jpg\">

what could be the answer for this?...Help needed...Thx.

[dazzlego]

Jamesbond:

http://i46.tinypic.com/slpws9.jpg\">

what could be the answer for this?...Help needed...Thx.

The answer is (3) W and X only. W can be obtained placing the whole mixture of the 4 substances together in water. Then, use a magnet on the remaining mixture (X,Y,Z), and a mixture of Y and Z will be taken out. What is left is X. Tada!

[Jamesbond]

dazzlego:

Jamesbond:

http://i46.tinypic.com/slpws9.jpg\">

what could be the answer for this?...Help needed...Thx.

The answer is (3) W and X only. W can be obtained placing the whole mixture of the 4 substances together in water. Then, use a magnet on the remaining mixture (X,Y,Z), and a mixture of Y and Z will be taken out. What is left is X. Tada!

Thank you Dazzlego....

[milomilo]

Help needed:


Gopal pumped air into 2 footballs. The footballs when fully inflated each have a capacity of 400cm3. For football A, he pumped 350cm3 into it and for football B he pumped 405cm3. Which of statement is correct?

(1) Ball A is heavier than Ball B
(2) Ball B has 405cm3 of air inside it
(3) Both Ball A and B has 400cm3 of air inside it
(4) Ball A and Ball B are of the same mass after air was pumped in.

Note: Answer (1) and (4) are obvious wrong.

Thanks!

[Nebbermind]

milomilo:

Help needed:


Gopal pumped air into 2 footballs. The footballs when fully inflated each have a capacity of 400cm3. For football A, he pumped 350cm3 into it and for football B he pumped 405cm3. Which of statement is correct?

(1) Ball A is heavier than Ball B
(2) Ball B has 405cm3 of air inside it
(3) Both Ball A and B has 400cm3 of air inside it
(4) Ball A and Ball B are of the same mass after air was pumped in.

Note: Answer (1) and (4) are obvious wrong.

Thanks!

(2) Air can be compressed so vol should be 400cm3
(3) Since A is not fully inflated, it cannot be 400cm3

Is this question from assessment bk or school's exams?

[milomilo]

In one of the school exam papers. Model answer is (3).


Also think cannot be 400cm3 because not fully inflated. But then what will be the next best answer??

[Nebbermind]

milomilo:

In one of the school exam papers. Model answer is (3).


Also think cannot be 400cm3 because not fully inflated. But then what will be the next best answer??

I supposed no correct answer.