Pei Hwa Presbyterian Primary
-
Jennifer:
This qn was accompanied by a diagram.janet_lee88:
[quote=\"Jennifer\"]2. Conveyor belt use of strong magnet) should not be tagged at P5 level.
sorry to jump in...but this question appears often.
my son was tested on the advantages/disadvantages of using electromagnet in maglev train.
\"my son was tested on the advantages/disadvantages of using electromagnet in maglev train\"
was there a diagram provided?[/quote]There was a diagram for that question. -
abc123mama:
P5 science section B: my boy did an average job. Previously, he always lost marks because of incomplete description. This time, he had abnormal and creative thinking to the questions. For example, cage for pet mouse. He thinks if he uses glass, the mouse will be overheated.
I do not think your boy is wrong to think the hamster will die from heat.
The qn is too vague - a 1 dimensional diagram of a house with no windows or labels it is a open top whatsoever.
I wrote a note : neither material is suitable. The hamster will either die of lack of oxygen or heatstroke. -
janet_lee88:
By chance, do you need have the qn to upload here? It will be very useful for us to understand what type of real-life qns will be used in exams
There was a diagram for that question.Jennifer:
This qn was accompanied by a diagram.
\"my son was tested on the advantages/disadvantages of using electromagnet in maglev train\"
was there a diagram provided? -
Jennifer:
my son thought it is to do with heat too. but the paper stated \"temperature is constant\". so cannot argue with them.abc123mama:
P5 science section B: my boy did an average job. Previously, he always lost marks because of incomplete description. This time, he had abnormal and creative thinking to the questions. For example, cage for pet mouse. He thinks if he uses glass, the mouse will be overheated.
I do not think your boy is wrong to think the hamster will die from heat.
The qn is too vague - a 1 dimensional diagram of a house with no windows or labels it is a open top whatsoever.
I wrote a note : neither material is suitable. The hamster will either die of lack of oxygen or heatstroke. -
S6169:
a) The doorbell rang when the switch was closed, the circuit became closed. The iron core became an electromagnet which attracts the armature.I think 2nd part of this this Q is wrong. when the switch is off, the spring metal (the conductor of electricity) still in contact, so the circuit is still a close circuit and everything is functioning.(electric induced magnetic force is still there).
What is the Model answer for the 1st part of the Q? From my boy, I think the answer also inaccurate.
b) Even though the switch was turned off, the iron core remains a temporary magnet for a while, attracting the metal armature and closed the contact, thus making the circuit closed. -
Jennifer:
My son think it in the same way, so he left this Q a blank.abc123mama:
P5 science section B: my boy did an average job. Previously, he always lost marks because of incomplete description. This time, he had abnormal and creative thinking to the questions. For example, cage for pet mouse. He thinks if he uses glass, the mouse will be overheated.
I do not think your boy is wrong to think the hamster will die from heat.
The qn is too vague - a 1 dimensional diagram of a house with no windows or labels it is a open top whatsoever.
I wrote a note : neither material is suitable. The hamster will either die of lack of oxygen or heatstroke.
and he disagree with the model answer by thinking that not all plastic are transparent. :slapshead: -
Jennifer:
I do not like this qn- the diagram is too confusing at P5 level. Somemore the door bell is labelled not at the contacts which are the parts that will make the ringing sound.
a) The doorbell rang when the switch was closed, the circuit became closed. The iron core became an electromagnet which attracts the armature.S6169:
I think 2nd part of this this Q is wrong. when the switch is off, the spring metal (the conductor of electricity) still in contact, so the circuit is still a close circuit and everything is functioning.(electric induced magnetic force is still there).
What is the Model answer for the 1st part of the Q? From my boy, I think the answer also inaccurate.
b) Even though the switch was turned off, the iron core remains a temporary magnet for a while, attracting the metal armature and closed the contact, thus making the circuit closed. -
dyh:
A pet locked inside a car parked at an open space carpark will die from heatstroke even though the outside temperature is 30 deg C.
my son thought it is to do with heat too. but the paper stated \"temperature is constant\". so cannot argue with them.Jennifer:
I do not think your boy is wrong to think the hamster will die from heat.
The qn is too vague - a 1 dimensional diagram of a house with no windows or labels it is a open top whatsoever.
I wrote a note : neither material is suitable. The hamster will either die of lack of oxygen or heatstroke. -
Jennifer:
:rotflmao: :rotflmao:
I wrote a note : neither material is suitable. The hamster will either die of lack of oxygen or heatstroke.
I also think the same thing...whatever material, the hamster will die.
Seriously, why ask such questions ? -
Jennifer:
The 2nd part of the Q mentioned that circuit will remain closed for a while? I think the circuit will remain closed untill the battery has run down.
a) The doorbell rang when the switch was closed, the circuit became closed. The iron core became an electromagnet which attracts the armature.S6169:
I think 2nd part of this this Q is wrong. when the switch is off, the spring metal (the conductor of electricity) still in contact, so the circuit is still a close circuit and everything is functioning.(electric induced magnetic force is still there).
What is the Model answer for the 1st part of the Q? From my boy, I think the answer also inaccurate.
b) Even though the switch was turned off, the iron core remains a temporary magnet for a while, attracting the metal armature and closed the contact, thus making the circuit closed.
For the 1st part of the Q, my son said the teacher mentioned about the resistance when she try to explain the answer.
Indeed, It is too complicated for a P5 student.
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login