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 Forum Index >  Test Paper Related >  Primary 5 Matters
 P5 Science Paper Rosyth School SA2 2011
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By: JezebelTan (offline)  Sunday, October 21 2012 @ 05:38 AM CDT (Read 1426 times)  
JezebelTan

Q24. <Pls refer to diagram>

My ans: (4)
Ans sheet: (3)

Can someone give me an explanation?
It is impossible for the answer to be (3)---> B and D only. D has the battery connected wrongly and those light bulbs would not light up. C also has the wrong connection. My ans is (4)--->C and D only as the bulbs in both C and D would not light up due to wrong connection of the batteries.

Q25. <Pls refer to diagram>

I can't understand why is the ans (2). Confused Pls help me!!!

Help needed urgently!
Will appreciate your help! Big Grin

Jezebel.

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By: JezebelTan (offline)  Monday, October 22 2012 @ 03:58 AM CDT  
JezebelTan

Someone please help me!!! Science exam coming soon!

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By: ystella (offline)  Monday, October 22 2012 @ 05:27 AM CDT  
ystella

Hi Jezebel,


I have no answer for Q24 but for Q25, the answer is (2). When bulbs are connected in parallel, brightness remain. Since Circuit S and Circuit V have the same number of batteries, both the circuits's bulbs give the same brightness.

Hope this help.

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By: JezebelTan (offline)  Monday, October 22 2012 @ 06:29 AM CDT  
JezebelTan

Thanks for your help!!! Big Grin
Exam coming. Very stressed! Frown

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By: GIM (offline)  Tuesday, October 23 2012 @ 10:09 AM CDT  
GIM

Q24
From the diagrams, circuit C&D have batteries connected wrongly, hence the bulbs will not light up at all. Circuit A has 4 batteries connected in series supplying electric current to one bulb with voltage of 1.5 x 4 =6v. Circuit B has 4 batteries in series supplying electric current to two bulbs, each bulb has a voltage of 3v. As such, bulbs in circuit A & B have different brightness. Conclusion, there is no answer to this question.

Q25
Circuit S has 2 batteries supplied to 1 bulb, voltage to bulb is 1.5v +1.5v =3 volts. Circuit V has 2 batteries supplied to 2 bulbs arranged in parallel, each bulb also received 3volts. Bulbs that are arranged in parallel will each draw 3volts from the 2 batteries whereas bulbs arranged in series will share the voltage from the 2 batteries, each bulb receiving only 1.5volts. Hence bulbs in circuit s & v have the same brightness. Answer is (2).

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