CSEC Integrated Science Paper 3 May/June 2013 - Free CXC Past Paper with Answers

Measure the diameter of Tomato A along the line shown in the tomato.

A cross-section of each fruit is placed in a petri dish. A few drops of iodine solution are placed on each fruit.

Write a suitable aim for this experiment.

Construct an appropriate table to record the results of the activity in (b) (i).

The following observations are made with the iodine solution:

Banana – turned blue black
Tomato – no colour change
Grape – no colour change

What scientific conclusions can be made from these observations?

Table 1 shows the results of the investigation in (c) (i).

TABLE 1: RESULTS OF INVESTIGATION

Reading	Mass of Tomato in Soil A (g)	Mass of Tomato in Soil B (g)
1	50	140
2	70	150
3	60	160
4	55	145
5	65	155
Average	60

Calculate the average mass of tomatoes grown in Soil B.

Write a suitable conclusion based on the results in Table 1.

The following is a list of materials that can be used to conduct an experiment to verify Archimedes' principle:

250 cm $^3$ measuring cylinder
Tap water
Spring balance
Block of wood
Steel ball
Lead weight
Copper coin
Aluminium bolt
Stone
String

Figure 2 shows a measuring cylinder before and after an object is submerged in the measuring cylinder containing some water.

Read the value of the volume of water in EACH measuring cylinder in Figure 2 and record it below.

Before: After:

Describe in detail how the materials in the list could be used to conduct the experiment.

In the space below, draw a labelled diagram of the apparatus, showing the arrangement of the materials and equipment used to conduct the experiment.

State an appropriate title for this diagram.

Table 2 shows the expected results for the experiment described in (a) (ii) on page 7.

TABLE 2: EXPECTED RESULTS OF EXPERIMENT TO VERIFY ARCHIMEDES' PRINCIPLE

Calculate the displacement of water for EACH object and record your answer in Table 2.

On the grid provided on page 9, draw a graph of mass versus displacement, using the data in Table 2. Mass is plotted on the y-axis and displacement on the x-axis.

Label the axes of the graph.

Find the slope of the graph.

From the slope calculated, write a statement on the relationship between the mass of an object and the volume of water displaced by that object.

Kwame is investigating the relationship between the load to effort ratio and the ratio of the distance A to the distance B in first-class levers. He uses a prism, ruler, wooden block, rubber bands, 100 g masses and two scale pans as shown in Figure 3. The 100 g masses can be added or removed from the scale pans.

Figure 3. Prism, ruler and various weights used in the investigation

Using your ruler, measure the distances, A and B. Include units in your answer.

A B

IF EACH mass is 100 g, what is the TOTAL value of the masses in Figure 3?

Load: Effort:

Describe the procedure in which the apparatus in Figure 3 could be used to compare the A:B ratio to the load:effort ratio.

How will the weight of the ruler affect the results of the investigation? Explain your answer.

State ONE source of error which can affect the accuracy of the investigation.

Suggest ONE modification to the experiment to improve the accuracy of the results.

In the space below, construct a table suitable for recording the results of the investigation.

Figure 4 represents a ruler.

Figure 4. Ruler

Place an X on the ruler to indicate the position of the centre of gravity, assuming that the ruler is uniform.

CSEC Integrated Science Paper 3 May/June 2013 Questions

Question 1 (14 marks)

TABLE 1: RESULTS OF INVESTIGATION

Question 2 (24 marks)

TABLE 2: EXPECTED RESULTS OF EXPERIMENT TO VERIFY ARCHIMEDES' PRINCIPLE

Question 3 (18 marks)

Figure 4. Ruler