tag:blogger.com,1999:blog-6746419206932469118.post4134710567451495258..comments2023-09-23T19:03:39.693+08:00Comments on Road to PSLE: The Consequential Question TrapExcel Eduservicehttp://www.blogger.com/profile/11691081348489781290noreply@blogger.comBlogger12125tag:blogger.com,1999:blog-6746419206932469118.post-21478381309192702552009-08-07T20:57:31.374+08:002009-08-07T20:57:31.374+08:00Hi um could someone help me??
Sophian set up an ...Hi um could someone help me??<br /><br /> Sophian set up an experiment to find out the products of alcoholic fermentation.He boiled the glucose solution and cooled it.Then he added yeast cells.Next,he poured a thin layer of liquid parrafin on top of the glucose solution.He observed that the limewater turned cloudy when the set-up was left in a warm place after an hour.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-47830747061407452472009-08-07T20:56:54.030+08:002009-08-07T20:56:54.030+08:00Hi um could someone help me pls?
Sophian set up a...Hi um could someone help me pls?<br /><br />Sophian set up an experiment to find out the products of alcoholic fermentation.He boiled the glucose solution and cooled it.Then he added yeast cells.Next,he poured a thin layer of liquid parrafin on top of the glucose solution.He observed that the limewater turned cloudy when the set-up was left in a warm place after an hour.pls help menoreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-23863758585126431502008-10-01T23:47:00.000+08:002008-10-01T23:47:00.000+08:00Yes, you will score for part (a).Yes, you will score for part (a).Excel Eduservicehttps://www.blogger.com/profile/11691081348489781290noreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-37692618725141510162008-10-01T17:35:00.000+08:002008-10-01T17:35:00.000+08:00What if you get part (a) right but part (b) wrong,...What if you get part (a) right but part (b) wrong, would you get the marks for part (a)?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-36866276831213992502008-07-22T21:33:00.000+08:002008-07-22T21:33:00.000+08:00The weak / average students tend to be careless. D...The weak / average students tend to be careless. Due to their carelessness, they may answer part a wrongly. Hence to mark part b wrong when the answer is correct does not sound fair to them.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-57402528648535099552008-04-23T14:04:00.000+08:002008-04-23T14:04:00.000+08:00Dear Mr SongI apreciate your fast reply.Upper prim...Dear Mr Song<BR/><BR/>I apreciate your fast reply.<BR/><BR/>Upper primary students will certainly benefit if they read your input diligently.<BR/><BR/>A big Thank You.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-57219004849593712842008-04-23T11:53:00.000+08:002008-04-23T11:53:00.000+08:00Yes, a the voltage rating of the bulb must be the ...Yes, a the voltage rating of the bulb must be the same as the voltage of the circuit. <BR/><BR/>If the voltage rating of the bulb is lower than the voltage of the circuit, the bulb may blow.<BR/><BR/>If the voltage rating of the bulb is higher than the voltage of the circuit, the bulb may not light up to its optimum performance, because the voltage of the circuit will not be able to "power up" the bulb to its "designed brightness". <BR/><BR/>That means, you wasted your money on that over-rated voltage bulb.Excel Eduservicehttps://www.blogger.com/profile/11691081348489781290noreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-8235112628645624282008-04-23T11:35:00.000+08:002008-04-23T11:35:00.000+08:00Dear Mr Song,Thank you for your reply.Going back t...Dear Mr Song,<BR/><BR/>Thank you for your reply.<BR/><BR/>Going back to the Sarah's question, can we now say that the voltage of the bulb should be changed to correspond with the increase in batteries' voltage.This is to prevent the bulbs from being blown.<BR/><BR/>Please advise.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-87741154634255240912008-04-22T11:43:00.000+08:002008-04-22T11:43:00.000+08:00It does not matter if it is an AC or DC circuit. I...It does not matter if it is an AC or DC circuit. If the bulb voltage rating is lower than the voltage of the circuit, there is a good chance the bulb may blow.<BR/><BR/>Incidentally, AC circuit is not part of PSLE Science syllabus.Excel Eduservicehttps://www.blogger.com/profile/11691081348489781290noreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-80870186364399652922008-04-22T07:43:00.000+08:002008-04-22T07:43:00.000+08:00Dear Mr SongThank you for your reply.I am sorry, I...Dear Mr Song<BR/>Thank you for your reply.I am sorry, I can't remember the source where I read the question from.I do hope I remembered the facts correctly.<BR/><BR/>Will inceased voltage of batteries blown up a bulb rated at lower voltage? For example a light fitting rated at 24V ac needs a transformer when installed in a 230Vac circuit.I am not sure about bulb in a dc circuit.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-81915199280450179422008-04-16T18:43:00.000+08:002008-04-16T18:43:00.000+08:00Where did you get the question from? If you want t...Where did you get the question from? If you want to test if a change in the voltage of the batteries will affect the brightness of the bulb, ALL other factors must be kept constant. <BR/><BR/>I cannot think of a logical answer why there is a need to change the voltage rating of the bulb.Excel Eduservicehttps://www.blogger.com/profile/11691081348489781290noreply@blogger.comtag:blogger.com,1999:blog-6746419206932469118.post-29441652331347861522008-04-16T08:48:00.000+08:002008-04-16T08:48:00.000+08:00Dear Mr SongPlease help.Sarah wants to find out wh...Dear Mr Song<BR/>Please help.<BR/><BR/>Sarah wants to find out whether the voltage of batteries used in a circuit affects the brightness of a bulb. To ensure a fair test, the number of batteries and the length of wires are kept constant. Besides changing the voltage of batteries, one of the variables that she should change is the voltage of the bulb. Please help to explain why we need to change the voltage of the bulb?Anonymousnoreply@blogger.com