Q&A - PSLE Science

[Candilicious]

Please help with this question:
Science PSLE 2015 Booklet B, question 32c
Question is: Suggest a control set up to sjow that the rise in temperature was caused by the germinating seeds.

[Candilicious]

Please help with this question:
Meife used the same seed throughout the experiment. Give 2 reasons how using the same seed helps to make experiment a fair test

[SOS mum]

vvv
Q: 1687582
Subject: Science
Level: P6, PSLE
Tags: Evaporation
Source: ???
^^^

Hi, please help me in the following question:
Many thks and God Bless:)

In some open-air restaurants, water mist systems are used to cool the surrounding air. Tiny water droplets are produced in a form of mist.

(i) Explain how the water droplets help to cool the surrounding air.
(ii) Tiny water droplets are better than larger ones. Why?
(iii) Explain why some water mist systems are fitted with fans

[Fly2high]

vvv
Q: 1690344
Subject: Science
Level: P6, PSLE
Tags:
Source: ???
^^^

hi all

Pls help on the attached question.

[Ender]

vvv
A: 1687582
Subject: Science
Level: P6, PSLE
Tags: Evaporation
Source: ???
^^^

This question test the concept of evaporation

Things to note about evaporation,
1. It takes away heat from surrounding. The faster it evaporates the more heat it takes away.

Things that affect the rate of evaporation
1. Higher temperature (Not relevant to this question)
2. More surface area exposed.
3. Presence of wind

My answer,
i) The water droplets will cool the surrounding air by evaporation. As evaporation takes up heat from surrounding air.
ii) For the same mass or volume of water droplets, tiny droplets will have more surface area exposed to the surrounding air compare to larger ones. Hence tiny droplets will have higher rate of evaporation and will result in b̶e̶t̶t̶e̶r̶ faster cooling of surrounding air as it takes up heat during evaporation process.
iii) One factor that increases the rate of evaporation is the presence of wind. Hence with a fan spinning and producing wind, the rate of evaporation will be higher hence result in faster cooling of surrounding air.

[ChiefKiasu]

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[ChiefKiasu]

vvv
A: 1690344
Subject: Science
Level: P6, PSLE
Tags: ???
Source: ???
^^^

Your picture is too small to see. Please attach a larger picture.

[Manga32]

How to know the keywords for each question accurately in Science Paper Booklet B?

[Puffer]

Moderator's Note: Question has been moved to AskQ. Please use AskQ to ask your academic questions from now on. Thank you.

[ljfeng]

Got the following from a teacher friend undergoing Primary School Science training: Common Misconceptions in Primary School Science.

Hope it helps in your PSLE Science Preperation