CSEC Integrated Science Paper 3 May/June 2010 - Free CXC Past Paper with Answers

Free CXC Integrated Science Paper 3 May/June 2010 past paper from 2010. Includes a worked answer key. Open the PDF, take a timed test, and study with AI on Caribbean AI.

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CSEC Integrated Science Paper 3 May/June 2010 Questions

Every question from this paper as text. See the answers and worked solutions. Questions are the property of the Caribbean Examinations Council; Caribbean AI is not affiliated with CXC.

Question 1 (26 marks)

(a)

In the space provided, draw and label a diagram of the: (i) cut okra/ochro (ii) soaked red bean.

[5 marks]

(b)

(b)(i)

Measure the length and diameter of the okra and record these measurements in Table 1.

[4 marks]

(b)(ii)

Measure the length of the bean and the width across its centre and record these measurements in Table 1.

TABLE 1: MEASUREMENTS RECORDED

Plant Material	Length (cm)	Diameter (cm)	Width (cm)
Okra
Bean

(d)

Procedure I. Carefully remove ONE okra seed and crush it in a petri dish or saucer provided. II. Repeat Step I for a second okra seed in another petri dish or saucer provided. III. To EACH seed add THREE drops of iodine and record any colour change you observe. IV. Record your observations and inferences in Table 2 below. V. Carefully open the bean and crush one cotyledon in a petri dish or saucer. VI. To the crushed cotyledon, add three drops of iodine and note any colour change. VII. Record your observations and inferences in Table 2.

TABLE 2: FOOD TESTS

Plant Material	Observation	Inference
Okra seed 1
Okra seed 2
Bean cotyledon

[4 marks]

Question 2 (22 marks)

You are provided with the following materials:

A piece of wood, labelled A, of length 30 cm covered with rough sand paper. The piece of wood has a groove at one end.
A piece of wood, labelled B, of length 30 cm covered with grease proof/wax paper. The piece of wood has a groove at one end.
A mounted piece of wood, labelled C, with nails 2 cm apart attached at the side
A small box of mass 100g

(a)

Procedure I. Place the piece of wood labelled B on the mounted piece of wood labelled C such that the groove rests on the lowest nail. The nails are 2 cm apart. II. Place the small box approximately halfway up the piece of wood labelled B and observe what happens. III. Repeat Step II with a different slope using the nails on the mounted piece of wood labelled C to adjust the height, until the weight on the piece of wood labelled B just starts to slide. IV. Record, in Table 3, the height at which the weight just starts to move. V. Repeat Steps I to IV using the piece of wood labelled A instead of the piece of wood labelled B.

(b)(i)

Use your results and the formula above to calculate the frictional force and record your results in Table 3.

TABLE 3: RESULTS OF EXPERIMENT

Material	Height (cm)	Frictional force ( ________ units )
A
B

Frictional force = height in cm $\times$ 0.01 N/cm

[2 marks]

(b)(ii)

In the heading of Table 3, write the unit in which the frictional force is measured.

[1 mark]

(b)(iii)

From your results, state, with an explanation, which surface had the HIGHEST frictional force.

[2 marks]

(c)(i)

In the space below, draw a labelled diagram of the apparatus as it was used.

[2 marks]

(c)(ii)

Write a suitable title for this drawing.

[1 mark]

(d)(i)

Table 4 gives varying heights in centimetres. For EACH height, calculate the corresponding frictional force.

TABLE 4. FRICTIONAL FORCE

Height (cm)	Frictional force
0
4
8
12
16
20
24
28

[3 marks]

(d)(ii)

Using the data in Table 4, plot a graph of the frictional force against height on the graph paper provided on page 8.

[6 marks]

(d)(iii)

Indicate on the graph the MAXIMUM frictional force for the box on the piece of wood labelled A.

[1 mark]

(d)(iv)

What is the frictional force on the box when the height is 15 cm?

[1 mark]

(e)

List THREE variables that were controlled in this experiment.

[3 marks]

CSEC Integrated Science Paper 3 May/June 2010 - Free CXC Past Paper with Answers