Q&A - PSLE Science

[Michaelia0816]

Can You help me with 4 more MCQ? That all.


Links:
1) http://t.co/PZcFU3p0
2) http://t.co/dIPEVAED
3) http://t.co/Is9qRoUr
4) http://t.co/kmMiSs88

[charsen]

Michaelia0816:

Is the answer for link 2 is option 3?

Yes.It is absouletely right.

[charsen]

Michaelia0816:

Can You help me with 4 more MCQ? That all.


Links:
1) http://t.co/PZcFU3p0
2) http://t.co/dIPEVAED
3) http://t.co/Is9qRoUr
4) http://t.co/kmMiSs88

Hi
For mcq questions,Try to identify the topic the question is tested and the concept in one minute or less.Once you find these,it will take a few seconds to finish the answer.
Take question 1 for example.

Q1.Topic:Web of life.Concept:Interdependency in animals
Answer is (1) since aphids are eaten by lady birds which is true.Aphids is not eaten by frog.
Try this method for the other three questions.All the best for your PSLE.
Cheers

[Michaelia0816]

Thx for checking the circuit question, I would do so.

[ms_lim]

Can someone explain this question? Ans key is 3 but my ds says it's 4 :


http://i48.tinypic.com/1ieeip.jpg\">

[mamago]

ms_lim:

Can someone explain this question? Ans key is 3 but my ds says it's 4 :


http://i48.tinypic.com/1ieeip.jpg\">

Answer is 3, because the table top is parallel to the ground.

Gravity only needs to be overcome (in order to move) when the surface is tilted and the object is traveling against gravity (upwards).

[ms_lim]

mamago:

ms_lim:

Can someone explain this question? Ans key is 3 but my ds says it's 4 :


http://i48.tinypic.com/1ieeip.jpg\">

Answer is 3, because the table top is parallel to the ground.

Gravity only needs to be overcome (in order to move) when the surface is tilted and the object is traveling against gravity (upwards).

Thanks mamago. One more question. What is the direction of the magnetic force between the steel table top and magnet?

[mom-of-2 0]

If two rods of same material and length but of different thickness is heated for the same amount of time, which will expand more and why ?


Thank you for your help !

[Michaelia0816]

Charsen, pls help again,

Links:
1) http://t.co/WwFH4XKm
2) http://t.co/c0lZFCKA
3) http://t.co/Gh4elLEc
4) http://t.co/0wPRPxTf ( Questions)
http://t.co/LxBxJszu ( Pictures/ Diagrams)

[charsen]

Michaelia0816:

Charsen, pls help again,

Links:
1) http://t.co/WwFH4XKm
2) http://t.co/c0lZFCKA
3) http://t.co/Gh4elLEc
4) http://t.co/ 0wPRPxTf ( Questions)
http://t.co/LxBxJszu ( Pictures/ Diagrams)

Hi
I could not access Link4 and do not know where is the question in link 5.
For link1,The clue is that you have to answer the question based on the diagram given.

For link2,Answer:The magnetised coils would attract to the iron tube.Hence,the magnetised coils could not have a force of attraction between the plunger.Thus,the plunger cannot push out the ball and the catapult would not work.
b)Any magnetic materials

For link 3:I will let you do a and b.Diagonse the question well and you should be able to answer the question.
Note:a b and c are realeated.
c)In balloon B, there is water in it.Since water is a poor conductor of heat,it retains heat for a longer time and allows heat to escape from it to the air inside the balloon,reducing the rate of heating the air in it unlike balloon a,where there is no poor counductor of heat in the balloon to reduce the rate of heated air,thus,there was more heated air in balloon a and expanded.Thus, balloon a burst.
Cheers