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SECTION B

[20 marks ]

Answer all the questions.You are advised to spend 30 minutes on this section. If you cannot answer anyquestion, skip it and answer the next question. Write your answers in the spaceprovided.

1. A group of researchers gathered information about an animal species ina particular forest. The Table 1 shows information obtained by the researchers.

TABLE 1

Year Number of animals species

1990 200

1995 170

2000 150

2005 130

a) What is the trend in the number of the animal species?

..

( 1 mark)

b) State two reasons to explain the trend that you have state in (a).

.

..........................

c) Give another observation to support your reason in (b)

.........................

......

(1 mark)

d) Predict the number of animal species in year 2008.

.

(1 mark )

2. Diagram 2 shows an investigation that is carried out by a group of pupils. They

use two iron blocks P and Q of different sizes. The iron blocks were dipped into

a beaker of water that was being heated for 10 minutes. Block P was dipped

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into beaker X and block Q was dipped into beaker Y simultaneously. Each

beaker contains 50 ml of tab water and the initial temperature of tab water is

27C.

After one minute, the temperature of water in beaker X and Y was measured.

The temperature in beaker X is 45C and the temperature in beaker is 32C.

a) What is the aim of this investigation?

..

..

(1 mark)b) State two information gathered in this investigation?

..

......(1 mark)

c) What conclusion can be made from the information gathered in thisinvestigation?

..

..

(1mark)

d) More heat is found in beaker X than beaker Y. Based on this investigation,

state the relationship between what to change and the amount of heat

absorbed?

..

..

(1mark)

3. A group of pupils carried out an investigation to determine the conductivity of

heat of some materials. They followed the steps below.

Three different containers are filled with 100 ml of hot water.

The initial temperature of hot water in each container is measured.

2

P Q

Beaker X Beaker Y

Diagram 2

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The containers are left for 30 minutes on a table in science room.

After 30 minutes the temperature of the water is measured.

Table 1 shows the result of the investigation.

TABLE 2

Container Initial temperature ofhot water (C)

Temperature of hot water after30 minutes (C)

P 70 35

Q 70 55R 70 60

a) What do the pupils want to find out from the investigation?

(1 mark)

b) Based on the investigation, state the following:

i. thing to changed .

.....................................................................................................................

( 1 mark)

ii. thing to measured.

......................................................................................................................

( 1 mark)

c) State the relationship between what to changed and what to measured

that mention in (b)

..

..

( 1 mark)

4. A group of meteorologist carried out an investigation to determine the

temperature of four places P, Q, R and S at the same time of P on January.

3

P Q R

Metalcontainer

GlasscontainerGlasscontainer

Plasticcontainer

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Table 2 shows the result of the investigation.

TABLE 3

Position of places Temperature of places (OC)

P 37

Q 26

R 28

S 32

a) Give a reason why the temperature at place P is the highest.

( 1 mark )

b) State another observation to support your reason in 4(a).

( 1 mark )

c) Give another reason to support your answer in 4(b)

( 1 mark )

d) State a relationship between what to change and what to measured in this

investigation.

( 1 mark )

4

Sunlight P

Q

S

R

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5. Diagram 3 shows two models of bridges made by a group of pupils to find out

which model can support more load. Loads are added gradually on the

bridges until the bridges break.

Table 4 shows the result of the experiment.

TABLE 4

Bridge Mass of load that can be support (g)P 250

Q 100

a) State the aim of this experiment.

..

..

(1 mark)

b) Why bridge P can support more load compare to bridge Q?

..

..

( 1 mark)

c) Based on the investigation, state the following:

i. thing to changed .

...................................................................................................................

( 1 mark)

ii. thing to kept the same.

....................................................................................................................

( 1 mark)

END OF SECTION B

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Bridge P Bridge Q

Loads

cardboard

bricks

Diagram 3