2015 PSLE Discussion and Strategies

[PSLEYEAR]

lhl2003:

What about the question on battery arrangement(pic--cooking stall)

i think i put 4 … not sure though. can provide options?

[lhl2003]

Can anyone provide the options for the battery arrangement(pic–cooking stall) Thanks!

[Iluvmathnscience]

lhl2003:

1)What about question on the pipe breaking when it is straight. (Bklet A)

I am assuming that there are fixed points on the pipe? As the pipe gains heat, it expands. Due to insufficient room for expansion, the pipe will break a result. Think of similar questions involving train tracks with gaps. When the pipe is curved(??), there is room for expansion. This allows the pipe to gain heat and expand without breaking.

[PSLEYEAR]

what did u guys put for the boy feeling cold after swimming

[lhl2003]

Can anyone provide the options for the battery arrangement(pic–cooking stall) Thanks!

[SciencyKid]

lhl2003:

Can anyone provide the options for the battery arrangement(pic--cooking stall) Thanks!

Answe is 4. (Each bulb has an intensity of 4 units, thus strongest lighting)
Oh ya, for the fertilizer qn, answer should be bacteria. I did an similar qn to the one in the PSLE.

[NotMyRealName]

i got the boy coming out of the pool wrong i wrote about condesation

[NerdyMath]

PSLEYEAR:

what did u guys put for the boy feeling cold after swimming

When the boy stepped out of the pool, water will gain heat from his body and evaporate, thus he feels a little cold. When a strong wind blew, the rate of evaporation increased and the water evaporated faster from the body of the boy to the surrounding , hence he feels colder.

[beebyboopyboop]

The question came out in my prelim paper.

It was the wind caused an increase in the rate of evaporation making him lose heat faster and feel colder.

[NerdyMath]

lhl2003:

Can anyone provide the options for the battery arrangement(pic--cooking stall) Thanks!

Forgot the options but answer is 4