Q&A - PSLE Science

[Winx5015]

Hi, can I know what is the answer for this question.


A glass of pure ice cubes are melting in the Sun. A thermometer is placed in the glass. As the ice melts, its temperature_______________ .

(1) is at 0 degree celsius
(2) is at 100 degree celsius
(3) is higher than the surrounding temperature
(4) is the same as the surrounding temperature

I feel that the answer should be (4) but the answer key is (1).

Thanks

[verykiasumummy]

Winx5015:

Hi, can I know what is the answer for this question.


A glass of pure ice cubes are melting in the Sun. A thermometer is placed in the glass. As the ice melts, its temperature_______________ .

(1) is at 0 degree celsius
(2) is at 100 degree celsius
(3) is higher than the surrounding temperature
(4) is the same as the surrounding temperature

I feel that the answer should be (4) but the answer key is (1).

Thanks

hello Winx5015,

ans is 1, because the temperature of melting ice, being still in ice state, will remain as 0 C.

[fightingmom]

Winx5015:

Hi, can I know what is the answer for this question.


A glass of pure ice cubes are melting in the Sun. A thermometer is placed in the glass. As the ice melts, its temperature_______________ .

(1) is at 0 degree celsius
(2) is at 100 degree celsius
(3) is higher than the surrounding temperature
(4) is the same as the surrounding temperature

I feel that the answer should be (4) but the answer key is (1).

Thanks

Hi Winx5015,

Answer is (1)

Concept:
Water can change from one state to another when it's temperature changes.
The temperature of water will increase or decrease until it reaches the point where the change takes place. It will then stay at that temperature until the change is completed

That is to say, the ice will stay at 0 degree celsius until all the ice has melted.

Thus, the same applies for boiling.

Hope it helps

[charsen]

Winx5015:

Hi, can I know what is the answer for this question.


A glass of pure ice cubes are melting in the Sun. A thermometer is placed in the glass. As the ice melts, its temperature_______________ .

(1) is at 0 degree celsius
(2) is at 100 degree celsius
(3) is higher than the surrounding temperature
(4) is the same as the surrounding temperature

I feel that the answer should be (4) but the answer key is (1).

Thanks

Hi
Answer is 1 as pure water melts at 0 degree celcius.
Cheers

[Winx5015]

verykiasumummy, fightingmom and charsen,


Thanks for your help and explanation. I understand now.

[Tiramisu Coco]

verykiasumummy:

using another magnet to chk if it repels is not required to confirm if they have become temperary magnets, (only when u need to confirm an object is a magnet, as in permanent magnet) because temporary magnets are just for short term, so the repulsion may not be guaranteed.

:thankyou: :lovesite:

[Michaelia0816]

Thx you Charsen!

[paranoid]

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Question from Rosyth 2011 Prelim

[ximinful]

paranoid:

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Question from Rosyth 2011 Prelim

Ans 2

[ms_lim]

Can someone help to explain this question :


Boon Seng saw an animal for the first time in the zoo. He concluded that it was a bird. Which of the following characteristics should this animal have in order to be classified as a bird ?

(A) It has feathers on its body
(B) It has a beak
It can fly

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