Q&A - PSLE Science

[Fat Mama]

elkniwt:

Fat Mama:

Hi,

Ans (2) is correct.

Reason being marbles are round and hv gaps bet them. When liquid is pour in, it will fill up the gaps of the marbles. So vol of gas should be more than 700 which is (2) 750

Hi Fat Mama,

Thanks for taking time to reply

When the question says the total volume of marbles is 100 cm3, we thought it meant the total volume of the marbles without the gaps. :? (Cos usually, if we say volume of 1 marble is 10 cm3, volume of 10 marbles will be 100cm3, we don't factor in the gaps right?? )

Hi,

Check with DD this morning and she explained to me that 700 shd be the correct ans.

Our DDs are right.

Sorry for initial wrong explanation. :oops: :oops:

[charsen]

elkniwt:

Hi,


Need help on this qn from CHS prelim :

http://i46.tinypic.com/1zp03fb.jpg\">

Answer in answer key is (2). dd's ans is (1) ?? (I think ans key is wrong, need some advices. Thanks!) :?:

Hi
Volume of substance b + marbles---->300cm3
Since Substance d can compress,the volume of the substance d should be 700cm3.
cheers

[Robertpattinsonidle]

charsen:

elkniwt:

Hi,


Need help on this qn from CHS prelim :

http://i46.tinypic.com/1zp03fb.jpg\">

Answer in answer key is (2). dd's ans is (1) ?? (I think ans key is wrong, need some advices. Thanks!) :?:

Hi
Volume of substance b + marbles---->300cm3
Since Substance d can compress,the volume of the substance d should be 700cm3.
cheers

i dont understand the reason behind this. anyone can explain pls?

[elkniwt]

Dear Fat Mama, charsen and Alarmchain,


Thank you so much for your confirmation!! :hugs:

Dear Robertpattinsonidle,

You can take note of the explanations given by Fat Mama, charsen and Alarmchain.

[charsen]

Robertpattinsonidle:

charsen:

[quote=\"elkniwt\"]Hi,


Need help on this qn from CHS prelim :

http://i46.tinypic.com/1zp03fb.jpg\">

Answer in answer key is (2). dd's ans is (1) ?? (I think ans key is wrong, need some advices. Thanks!) :?:

Hi
Volume of substance b + marbles---->300cm3
Since Substance d can compress,the volume of the substance d should be 700cm3.
cheers

i dont understand the reason behind this. anyone can explain pls?[/quote]Hi
Substance B and the marbles have a definite volume.thus,they could not be compressed.Hence,their volume will be always 300cm3.Substance d can be compressed.For example,assume that substance d is air.If there is 700cm3 of air in the bottle and 300cm3 of other substances which has a definte volume,no matter how much volume of air is pumped in the bottle,assuming that the capacity of the bottle is 1litre,the volume of air remains the same as air occupies space.Relate this explantion to the question and you should be able to answer your doubts on the question.

Remember,althogh air can be compressed,it cannot be compressed fully.
Cheers

[charsen]

Robertpattinsonidle:

charsen:

[quote=\"elkniwt\"]Hi,


Need help on this qn from CHS prelim :

http://i46.tinypic.com/1zp03fb.jpg\">

Answer in answer key is (2). dd's ans is (1) ?? (I think ans key is wrong, need some advices. Thanks!) :?:

Hi
Volume of substance b + marbles---->300cm3
Since Substance d can compress,the volume of the substance d should be 700cm3.
cheers

i dont understand the reason behind this. anyone can explain pls?[/quote]Hi
Substance B and the marbles have a definite volume.thus,they could not be compressed.Hence,their volume will be always 300cm3.Substance d can be compressed.For example,assume that substance d is air.If there is 700cm3 of air in the bottle and 300cm3 of other substances which has a definte volume,no matter how much volume of air is pumped in the bottle,assuming that the capacity of the bottle is 1litre,the volume of air remains the same as air occupies space.Relate this explantion to the question and you should be able to answer your doubts on the question.

Remember,althogh air can be compressed,it cannot be compressed fully.
Cheers

[G Tan]

Can someone teach me how to upload a picture to my post

[tianzhu]

G Tan:

Can someone teach me how to upload a picture to my post

Hi

If the question is from top school past years papers, you may just provide a link to the paper highlighting the question number of the particular question you wanted to ask.

http://www.orlesson.org/orp/ScienceExam.html

The steps to insert an image

1) Do a print screen of the portion you want to upload.

2) Edit using Paint. Cut out the portion of the question you want to upload.

3) Save file in pictures

4) Go to Flickr (Free sign up as member) or other storage sites. Upload file. Select medium size. Right click to copy URL of image.

5) Coming back to Kiasuparents forum, click insert image button.

Best wishes

[Fat Mama]

How do you interpret the following sentences


1. The nail attracted the magnet.

2. The nail is attracted to/by the magnet.

Tks

[Robertpattinsonidle]

http://i48.tinypic.com/s3hawl.jpg\"> someone help me with these types of questions. how to understand and what is the explanation?