SEKOLAH SRI UTAMAKUALA LUMPUR

PEPERIKSAAN PENGGAL KEDUA 2012SCIENCEFORM 1

Answer all questions.

1. Figure 1 shows the cross section of a human skin. (S1P4)

a) Label Figure 1, using the words given in the box below.

Epidermis touch receptor pressure receptor

( 3 marks )

b) What is the function of K?( 1 mark )

c) Why are finger tips more sensitive then legs?( 1 mark )

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K

2. Figure 3 shows two conical tasks, A and B each filled with 100 ml of hot water. The initial temperature is taken. After 5 minutes, the final temperature is taken and recorded as Table 1 below. (S1P8)

Figure 3 : Two flask A and B painted differently

water temperature /oC Conical Flask A Conical Flask BInitial 90 90Final 70 78

Table 1

a) What is the method heat transfer that take place in Conical Flask A and B ?

………………………………………………………………………………………( 1 mark )

b)i) Which flask shows the least declination of temperature?( 1 mark )

……………………………………………………………………………………… ii) Base on your answer in (b)(i), why does this happen?

( 1 mark )

………………………………………………………………………………………c) A thermo flask can keep the heat of the hot water for a longer period of time which part

of the thermo flask prevent the heat loss?( 1 mark )

………………………………………………………………………………………d) What is the function of asbestos ?

( 1 mark )………………………………………………………………………………………

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Asbestos Sheet

Conical Flask A Conical Flask B

Conical Flask Apainted with a dull black paint

Conical Flask Bpainted with a shiny aluminium paint

Thermometer

3. Figure 6 the set-up of an experiment. (S1P12)

Figure 6

a) How can the mixture of sulphur and iron fillings be separated?

_______________________________________________________________________ ( 1 mark )

b) What is the colour of the substance produced after the mixture is heated strongly?

( 1 mark )

c) Can the mixture be separated with a bar magnet after strong heating? Explain why?

_______________________________________________________________________

______________________________________________________________________( 2 marks )

d) Name the new substance formed if iron is replaced by zinc.

______________________________________________________________________ ( 1 mark )

e) Write the word equation for the reaction.

_______________________________________________________________________ ( 1 mark )

f) State the difference between compound and mixture.

_______________________________________________________________________ ( 1 mark )

g) State one method to separate a compound into their element.

__________________________________________________________________________________

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( 1 mark )

4. Figure below shows a reaction between solution X and sodium hydroxide solution.

(S1P14)

The result of the experiment is recorded in table below:

Volume of X solution / cm3

5 10 15 20 25 30 35 40

pH 14 12 10 8 7 6½ 5½ 4

Table 2a) Base of table2 state two characteristics of X solution.

i) __________________________________________________________________

ii) __________________________________________________________________( 2marks )

b) State the volume of X solution needed to neutralised 25 cm3 dilute solution of natrium hydroxide.

____________________________________________________________________ ( 1 mark )

c) What is the colour of universal indicator in the conical flask when 15 cm3 of X solution is added into it?

_______________________________________________________________________ ( 1 mark )

d) Complete the equation below.

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Solution X

25 cm3 diluted sodium hydroxide solution + universal

conical flask

____________ + natrium hydroxide natrium chloride + ______________( 2 marks )

5. Figure 5 shows a pyramid number.

Figure 5

(a) Name the type of consumers represented by P and Q in Figure 1.

P : ……………………..

Q : ……………………..

(b) The estimated number of the organisms in the organisms in the community is shown for some of the organisms. Estimate the number for…

(i) insects : …………………….. (ii) snakes : ……………………….

[choose your answers from the following numbers: 2000, 80, 3]

6. Figure 6 shows two containers P and Q with the same amount of water in them.

Figure 6

(a) The two containers, P and Q, containing equal amounts of water were left outside the laboratory for about two hours. The amount of water in each container was then measured. It was found that the amount of water was less than the initial amount and the two containers do not have the same amount of water.

C54m154s3

(i) What process has taken place to reduce the amount of water in the container?

……………………………………………………………………………………………

(ii) Which container will have less water after two hours?

……………………………………………………………………………………………

(b) (i) What feature of the two containers accounts for the difference in the amount of water them after two hours?

…………………………………………………………………………………………..

(ii) State the relationship between this feature and the rate of decrease of the amount of water.

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…………………………………………………………………………………………..

(c) Name two other factors that can be affect the rate of decrease of the amount of water in the containers.

…………………………………………………………………………………………………

7. Figure 7 shows two types of plants.

(a) The plant shown in which figure is.…

(i) a monocotyledon?

……………………………………………..

(ii) a dicotyledon?

……………………………………………..

(a) (b)Figure 7

(b) Give four characteristics which are different in the plants shown in Figure 3.

1. ……………………………………………………………………………………………

2. ……………………………………………………………………………………………

3. ……………………………………………………………………………………………

4. ……………………………………………………………………………………………

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8. Figure 8 shows an experiment carried out to determine the density of an irregular object.

Figure 8

(a) State the formula used to calculate the density of the object.

…………………………………………………………………………………………………

(b) Calculate the density of the stone.

…………………………………………………………………………………………………

9. Figure 9 shows a water processing plant.

Figure 9

(a) The parts labelled P, Q, R and S are…

P R

Q S

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(b) What two substances X and Y are added into the coagulation tank? Explain the reason for adding them.

Substance ReasonX

Y

(c) What is being done in the filtration tank?

……………………………………………………………………………………………………….

(d) State two substances that are added into R to treat the water before it enters into S. Why are these substances added?

(i) ………………………………………… (ii) …………………………………………

(e) Identify the five stages of the flow chart which shows water treatment in a treatment plant.

Water at the reservoir

P Q R

Channel to houses

T S

P : ……………………………………… Q : …………………………………………

R : ……………………………………… S : …………………………………………

T : ………………………………………

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10. A student sets up the apparatus shown in Figure 10 to study the process of photosynthesis. The plants in the bell-jars, P and Q are first destarched by keeping them in the dark for two or three days. The student then leaves P and Q in the sun for 2-3 hours. He then tests the leaves from both the bell-jars for starch.

Figure 10 – c52m96s7

(a) What is the student trying to find out in the experiment shown in Figure 6?

………………………………………………………………………………………………..

(b) State the variables that are kept…

Constant

Manipulated

Responding

(c) The following table can be used to show the results of the experiment. Mark (/) in the table below if carbon dioxide or starch is present and mark (X) if carbon dioxide or starch is not present.

Plant Carbon dioxide StarchPlant in bell-jar P

Plant in bell-jar Q

(d) What can the student conclude from the experiment above?

………………………………………………………………………………………………….

(e) Write in the box below a word equation to represent photosynthesis process?

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