This P5 Science CA1 paper from Henry Park (2021) contains 13 questions worth 15 marks. Use it as a study reference for Science topics typically tested at P5 level in Singapore schools.
Q1Open-ended1 mark
(d) Aminah's teacher told her that she needs to carry out the experiment in a room using a fan to obtain a more accurate result. Explain why doing the experiment outdoors may not produce an accurate result.
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Aminah hung out two identical wet T-shirts, X and Y, to dry at the same time in her garden. She wanted to find out which T-shirt would become completely dry first. (a) State the dependent and independent variables in the above experiment. (i) dependent variable: (ii) independent variable:
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Pei Ling wanted to find out which material causes water to gain the least amount of heat. She used 3 different materials, P, Q and R, for her experiment. She wrapped each can with a different material. She placed the cans in the same room as shown below. She used similar heat lamps and similar cans for the experiment. She recorded the temperature of the water at the start and 15 minutes later as shown in the table below. (a) State the temperature of the water at the start of the experiment. ____ °C
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Based on the results, Pei Ling concluded that material R allows the water to gain the least amount of heat. (b) Pei Ling's teacher told her that her conclusion may not be correct. Explain why.
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Bacteria N cause throat infection. Throat infection can be treated with antibiotics. Antibiotics are medications that kill bacteria or slow down bacterial growth. Mrs Wong investigated how effective different antibiotics (A, B and C) were at killing bacteria N. What Mrs Wong did: Spread bacteria N on some jelly in a Petri dish. Placed three paper discs, each soaked in a different antibiotic, A, B and C, onto the jelly. Placed another paper disc soaked in water onto the jelly. (a) Which of the following variables must be kept the same during the experiment? Tick (✓) the correct variables. (i) size of clear area around paper disc (ii) type of antibiotic used (iii) amount of each antibiotic used (iv) thickness of paper discs used
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