This document contains sample questions from past science exams on various topics: 1. An experiment on the electrical conductivity of lead bromide, measuring the current through an ammeter. 2. An experiment using a concave lens to form an image. 3. An experiment culturing bacteria to study the relationship between colony growth and time. 4. An experiment comparing the elasticity of natural rubber and processed rubber. It also provides multi-part questions testing the ability to form hypotheses, design experiments, analyze data, and apply science concepts. Questions cover topics like food processing, polymer properties, and classifying materials as conductors, insulators and thermoplastics/thermosets.

1. 1
Program Easy Science 2
Name: ……………………………………………… Ting: 5
Section A (20 Marks)
Example of the sets of questions taken from Section A 2006
1 Diagram 1.1 and Diagram 1.2 show an experiment to study the electrical
conductivity of lead (II) bromide.
(a) (i) Based on Diagram 1.2, what is your observation on the needle of the
ammeter?
...........................................................................................................................
[1 mark]
(ii) What is the reading of the ammeter in Diagram 1.2?
.............................................. A [ 1 mark]
40

2. 2
(b) State the variables in this experiment.
(i) Manipulated variable:
...........................................................................................................................
[1 mark]
(ii) Responding variable:
...........................................................................................................................
[1 mark]
(c) State one inference for this experiment.
...........................................................................................................................
[1 mark]
(d) Lead (II) bromide is an ionic compound.
State the operational definition for an ionic compound.
...........................................................................................................................
[1 mark]
2 Diagram 2 shows an experiment to study the formation of an image by a
concave lens.
DIAGRAM 2
(a) Complete Diagram 2 to show the formation of the image by the concave
lens.
[2 marks]
(b) Measure and write down the distance of the image.
............................................... cm [1 mark]
(c) State two characteristics of the image formed in 2(a).
1. ...........................................................................................................
2. ...........................................................................................................
[2 marks]

3. 3
3 In an experiment, a bacteria Basillus subtilis is cultured in a petri dish
containing nutrient agar for five days at 37 °C.
The result of the experiment is shown in Table 3.
TABLE 3
(a) Using data in Table 3, draw a graph of the number of bacterial colonies
against time.
[2 marks]

4. 4
(b) What is the relationship between the number of bacterial colonies and
time?
...........................................................................................................................
...........................................................................................................................
[ 1 mark]
(c) Predict the number of bacterial colonies produced on the 6th
day.
...........................................................................................................................
[ 1 mark]

5. 5
4 Diagram 4 shows an experiment to compare the elasticity of a natural rubber,
(Rubber P) with a natural rubber that has been soaked in sulphur monochloride
solution, (Rubber Q.)
DIAGRAM 4
(a) State the hypothesis that can be made from this experiment.

6. 6
...........................................................................................................................
[1 mark]
(b) State the variables in this experiment.
(i) Controlled variable:
...........................................................................................................................
[1 mark]
(ii) Manipulated variable:
...........................................................................................................................
[1 mark]
(c) Based on this experiment, which rubber is more elastic?
...........................................................................................................................
[1 mark]
(d) Mark (_/) the objects which are made of natural rubber that has been
processed as in rubber Q.
[1 mark]

7. 7
SECTION C
Question 10 (2008)
10. Study the following statement:
You are given a copper rod and a glass rod of the same size, one dry cell and a
bulb.
(a) Suggest one hypothesis to investigate the above statement.
(b) Describe one experiment to test your hypothesis in 10(a) based on the
following criteria:
(i) Aim of the experiment
(ii) Identification of variables
(iii) List of apparatus and materials
(iv) Procedure or method
(v) Tabulation of data
Question 11 (2006)
(a) State one difference between the following food processes and give one
suitable example of food in ach case.
(i) Canning and pasteurization
(ii) Deep freezing and chilling
[4
marks]
(b) You are a teenager who is undergoing growth. You are given three types
of breads as shown in Diagram 11.
Choose the most suitable bread for your growth.
Explain your choice based on the following aspects:
• Aim of choice
• Explanation on the advantages of each type of bread based on the food
class and its function.
• List of types of bread according to its priority
• The reason for your choice.
Electrical conductivity of metals and non-metals are different.

8. 8
Question 12 (2007)
12 (a) Explain the chain structure of the polymers in a thermoset.
State two properties of a thermoset that are caused by the chain structure
of the polymer.
Terangkan struktur rantai polimer dalam suatu termoset.
Nyatakan dua sifat termoset yang disebabkan oleh struktur rantai polimer
tersebut.
(b) Diagram 12 shows four types of objects made of thermoplastic.
Rajah 12 menunjukkan empat jenis objek yang diperbuat daripada
termoplastik.
Hubungkaitkan ciri sepunya untuk membina konsep termoplastik
Study the objects in Diagram 12 and construct the concept of thermoplastic.
.
Your answer should be based on the following aspects:
• Identify two common characteristics

9. 9
• Give one other example of thermoplastic
• Give two examples of non-thermoplastic
• Relate the common characteristics to construct the concept of
thermoplastic