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Unit Page

1. The Scientific Endeavour 1

2. Physical Properties of Matter And Measurement 10

3. Chemical Composition of Matter 26

4. Diversity of Matter Using Separation Techniques 40

5. Diversity of Living Things 53

6. Model of Cells 68

7. The Particulate Nature of Matter 83

8. Model of Matter - Atoms and Molecules 99

9. Ray Model of Light 115

10. Transport System in Living Things - I 128

Transport System in Living Things - II 144

11. Human Digestive System 152

12. Human Reproductive System Part - I 165

Human Reproductive System Part - II 177

13. Electrical Systems - I 183

Electrical Systems - II 197

14. Interactions Through Application of Forces 209

15. Energy and Work done 224

16. Transfer of Sound Energy Through Vibrations 235

17. Effects of Heat and its Transmission - I 249

Effects of Heat and its Transmission - II 260

18. Chemical Changes 274

19. Interactions Within Ecosystem 287

Final Year Examination Paper 1 297




Answers 337

UNIT |

The Scientific Endeavour 1


Multiple Choice Questions

For each question, choose the most suitable option and write its letter (A, B, C or D) in the brackets provided.

1. Albert Einstein, the mathematical physicist is known for his ______________.

A theory of relativityB discovery of radiumC laws of gravityD discovery that bacteria make food go bad [ ]

2. Chemistry is the study of ____________________.

A force and energy B weatherC substances D living things [ ]

3. Laboratory apparatus are mainly made of glass because they _________.

A can be cleaned wellB are easily availableC can withstand heatD are transparent [ ]

4. We should not keep reagent bottles _________________.

A on the top of the rackB uncappedC unlabelledD under direct sunlight [ ]

5. Global warming is a harmful effect of technology and is due to _______________.

A our freedom to express our thoughts through social mediaB our use of cell phones at inappropriate timesC increase in the number of cars on the roadD pollution of land and water by plastic products [ ]

Section A

Secondary 1 & 2 Science | Topical Exercise2

CompleteMS AR TSERIES SCIENCE

6. A __________________ is used to observe cells.

A microscope B telescopeC periscope D bioscope [ ]

7. Which of the following statements are about the characteristics of scientists?

(1) Scientists often try to disprove their own ideas.(2) Different scientists may get different solutions to the same problem.(3) Scientists assume that nature follows the same ‘rules’ or ‘laws’ throughout the

universe.

A 1 only B 1 and 2 onlyC 2 and 3 only D 1, 2 and 3 [ ]

8. Which of the following observation is quantitative?

A Sugar makes water taste sweet.B Pure water boils at 100 °C.C Oil makes paper translucent.D Metals expand when heated. [ ]

9. Ammonia solution is an irritant. Which one of the following warning symbol will be labelled on the ammonia solution container?

A B

C D [ ]

10. What is science?

A Science is the study of living things.B Science is the study of the universe.C Science is the systematic inquiry of knowledge.D Science is the study of forces and energy. [ ]

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11. Which of the following are the benefits of technology?

I. More diseases can be cured with the development of medicines.II. The development of fertilisers has increased the production of our food.III. Technology has been used to create weapons like atomic bombs and missiles.

A I onlyB I and II onlyC I and III onlyD I, II and III [ ]

12. Which one the following represents the correct order of the steps to be carried out for a scientific method of investigation?

A Observation, Hypothesis, Experiments, Prediction.B Experiments, Hypothesis, Observation, Prediction.C Observation, Hypothesis, Prediction, Experiments.D Hypothesis, Experiments, Observation, Prediction. [ ]

13. One of the serious harmful effects of technology is ________________.

A pollutionB transportationC electrificationD computerisation [ ]

14. Which apparatus is used to measure 25.0 cm3 of liquid very accurately?

A measuring cylinderB beakerC pipetteD conical flask [ ]

15. Which statement about science and scientists is not correct?

A Scientists can interpret the same observation and data in different ways.B Scientists can measure the strength of typhoons and earthquakes but cannot

prevent them from happening.C Scientists know the causes of many diseases and can always stop diseases

from spreading from one person to another.D Scientists know how to cure genetic disease through genetic engineering but

science cannot answer related ethical issues. [ ]



Short Answer Questions

Answer all the questions in the spaces provided.

1. What positive attitude was illustrated by each of the following examples?

Positive attitude

(a) Marie Curie worked for many years before she obtained radium.

(b) We must ensure that our actions do not harm or destroy endangered species.

(c) When making measurements, record even if you think the measurements are wrong.

(d) John Dalton proposed that matter is made of atoms even though people believed matter is made of fire, air, earth and water.

(e) Harold Urey, who published the theory on the origin of the Moon’s surface admitted he was wrong after he studied some rocks taken from the Moon.

2. Match the following.

Discovery/Invention Scientist

(a) Discovery of radium Albert Einstein

(b) Father of electricity Louis Pasteur

(c) Discovery that germs cause food to go bad Marie Curie

(d) Discovery of penicillin, the first antibiotic Michal Faraday

(e) Discover the theory of relativity, E = mc2, where energy and mass are equivalent

Alexander Fleming

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3. What do the following terms mean?

Term Meaning

(a) Variables

(b) Hypothesis

(c) Observation

4. Use the given words to complete the table.

Uranium Concentrated sulfuric acid Corrosive substance

Alcohol Irritant Radioactive substance

Symbol Type of Hazards Example

(a)

(b)

(c)



5. Choose the most suitable apparatus to be used for the following activities in the laboratory.

Burette Beaker Gas jar Measuring cylinder Crucible Conical flask

(a) Containing solids to be directly heated over a flame: ____________________

(b) For measuring a volume of liquid to an accuracy of 1.0 cm3: _______________

(c) For measuring a volume of liquid to an accuracy of 0.1 cm3: _______________

(d) For collecting gases: __________________________

6. State whether each statement is TRUE or FALSE.

(a) We make a fair test by controlling variables. ––––––––––

(b) Discoveries made by scientists always build on the work of others. ––––––––––

(c) Science can answer all ethical and social issues. ––––––––––

(d) Qualitative information is obtained through using measuring instruments.

––––––––––

(e) The independent variable is the variable we want to change. ––––––––––

Free Response Questions

Answer all the questions in the spaces provided.

1. (a) What is technology?

(b) Give two benefits of technology.

(i) _________________________________________________________

(ii) _________________________________________________________

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(c) Give two abuses or harmful consequences of technology.

(i) __________________________________________________________

(ii) __________________________________________________________

2. (a) Explain in your own words what do you understand by the scientific method.

(b) What are the four major steps in the scientific method ? [4]

1.

2.

3.

4.

(c) What happens if the results do not agree with the hypothesis?

3. (a) The diagram shows the parts of a Bunsen burner. State the steps involved in the lighting up of the Bunsen burner.

gas taprubbertubing

air-hole

barrel

collar

jet

base



(b) Luminous flame is produced when the air-hole is closed while non-luminous flame is produced when the air-hole is open. Give two other visible differences between a luminous and non-luminous flame.

Luminous flame Non-luminous flame

(i)

(ii)

(c) Briefly explain how you would find out if the luminous flame or the non-luminous flame is hotter.

4. (a) Give two general safety rules in the laboratory.

(b) What should you do when chemicals spill on your skin?

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5. The table shows the results from an experiment.

Volume of water (cm3)

Number of ice-cubes

Temperature of water (°C)

Time taken for the ice-cubes to melt

completely (s)

A 20 4 30 40

B 20 4 40 30

C 20 4 50 20

D 20 5 50 25

(a) State the hypothesis/aim of this experiment.

(b) Identify the various variable in the above experiment.

(i) Independent variable: ________________________________________

(ii) Dependent variable: _________________________________________

(iii) Controlled variable: __________________________________________

(c) Which of the above test result cannot be used for the conclusion? Why?

(d) Why is it necessary to perform a controlled experiment?

(e) What are the other controlled variables which are not added in the above experiment?

UNIT |



Physical Properties of

Matter And Measurement

2

Multiple Choice Questions

For each question, choose the most suitable option and write its letter (A, B, C or D) in the brackets provided.

1. Matter exists as ________________.

A solids only B liquidsC gases and liquids D gases, liquids & solids [ ]

2. Choose the statements that are correct.

(i) An empty vacuumed jar has matter in it. (ii) Steam, air and carbon dioxide are gases.(iii) Liquids have greater inter-molecular distance than gases.

A (i) only B (i) and (ii) onlyC (ii) only D (i), (ii) and (iii) only [ ]

3. The Mohs’ scale is used to measure the ____________ of a substance.

A strength B hardnessC density D flexibility [ ]

4. ______________ is the property of salt that makes it useful for cooking.

A Low thermal conductivityB High solubility in waterC Low electrical conductivityD High melting point [ ]

5. The filament in a bulb is made of tungsten because it has high ______________.

A strengthB hardnessC flexibilityD melting point [ ]

Section A

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