Q&A - P3 Science

[tianzhu]

Hi elkniwt


For Q19,try to relate to the context of the question.

In this question, the types of shadows formed are shown in the question, and we should draw conclusion from them without additional inputs.

If you want to look for a reason, you may look at it this way, but it’s not needed to answer this question.

The sizes of the objects are small, about 2cm, about the size of a 20 cents coin; it should not block the angle of the eyes while looking at the shadows. Try looking at a 20 cents coin.

Option(4) is a logical answer.

Best wishes

[atutor2001]

elkniwt:

Hi,


I refer to Qn 10 in this paper,
http://www.orlesson.org/orp/09Sc/P4-09-Sc-SA2-HenryPark.pdf

For this type of question, is it necessary to draw the outlines of transparent objects for the shadows?

Regards

I will choose 4 as the answer.

[iFruit]

atutor2001:

elkniwt:

Hi,


I refer to Qn 10 in this paper,
http://www.orlesson.org/orp/09Sc/P4-09-Sc-SA2-HenryPark.pdf

For this type of question, is it necessary to draw the outlines of transparent objects for the shadows?

Regards

I will choose 4 as the answer.

Yes. (4) is the right option.

Transparent means it shouldn't make a difference whether you put the light source before or after clear plastic ( but before frosted glass ). So (4) is the right option.

[the little little girl]

hi! how to do tis question??????????????????? :?:


Sumei poured water of different temperatures and amount into four glasses. Which glass has the most amount of heat?

1)volume of water: 100ml, 20 deg
2)Volume of water: 90ml, 30deg
3)Volume of water: 100ml, 40deg
4)Volume of water: 90ml, 80deg

option 4 more heat or option 3 more heat?
if volume is 90ml and 50deg, is it more than 3 or less? :? :imdrowning:

[the little little girl]

Hi,

i got a different ans from the ans key for tis question :

There are two identical beakers , A and B, each containing 300ml of water and the same volume of oil. Xianne put a plant in beaker B and placed both beakers on a table near the window.

Xianne took the plant out from Beaker B after 3 days. Which one of the followinh shows the likely amount of water left in the two beakers at the end of the experiment?

1) A=300ml, B=300ml
2) A=250ml, B=280ml
3) A=300ml, B=250ml
4) A=280ml, B=250ml

i chose 3 but ans is 4. Why? :? :scratchhead: :gloomy: :idea:

[ET-PH]

the little little girl:

hi! how to do tis question??????????????????? :?:


Sumei poured water of different temperatures and amount into four glasses. Which glass has the most amount of heat?

1)volume of water: 100ml, 20 deg
2)Volume of water: 90ml, 30deg
3)Volume of water: 100ml, 40deg
4)Volume of water: 90ml, 80deg

option 4 more heat or option 3 more heat?

My ans is 4. This is because ans 4 has the highest temperature and the least amount of water.
[quote] if volume is 90ml and 50deg, is it more than 3 or less? [/quote]

If the volume is 90ml and 50deg, it is difficult to decide between ans 3 and this option (too close). Hope school wouldn't set questions like this.

[ET-PH]

the little little girl:

Hi,

i got a different ans from the ans key for tis question :

There are two identical beakers , A and B, each containing 300ml of water and the same volume of oil. Xianne put a plant in beaker B and placed both beakers on a table near the window.

Xianne took the plant out from Beaker B after 3 days. Which one of the followinh shows the likely amount of water left in the two beakers at the end of the experiment?

1) A=300ml, B=300ml
2) A=250ml, B=280ml
3) A=300ml, B=250ml
4) A=280ml, B=250ml

i chose 3 but ans is 4. Why? :? :scratchhead: :gloomy: :idea:

My ans is 3. The layer of oil prevents evaporation (Theory), thus A is equal to 300ml. The plant in beaker B will absorb the water, so the amount of water should be lower than beaker A (300ml).

My guess on why the answer key is 4 is because it assumes that there is some evaporation (when it's placed near the window) even though there is a layer of oil.

I am no expert in Science, picking up the knowledge while i teach my dd. Any experts please feel free to correct me. Thanks.

[atutor2001]

ET-PH:

the little little girl:

hi! how to do tis question??????????????????? :?:


Sumei poured water of different temperatures and amount into four glasses. Which glass has the most amount of heat?

1)volume of water: 100ml, 20 deg
2)Volume of water: 90ml, 30deg
3)Volume of water: 100ml, 40deg
4)Volume of water: 90ml, 80deg

option 4 more heat or option 3 more heat?

My ans is 4. This is because ans 4 has the highest temperature and the least amount of water. incorrect

The answer is 4. How to check :
100 x 40 = 4000
90 x 80 = 7200

The product is (proportional to) an indication of the amount of heat (a shortcut you may wish to teach your kid)

[the little little girl]

Thank You Uncle ET-PH & Auntie atutor2001! :salute: :thankyou: :rahrah:

[jedamum]

ChiefKiasu:

Posted: 02 May 2008 10:55 Post subject: Q&A - P3/P4 - Science

I tried to do the P3 Science exams from the top schools....

Chief,
2.5yrs and 50++pages later, here i am officially taking interest in this thread.
Time flies ah!!!