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•Encircle the letter of the correct answer.1. Why are additives used in foods? Because they _________.A. preserve food C. add vitamins to the foodB. make the food sweet D. improve the flavor and color of food2. Ginisa mix adds taste to food like tinola. Ginisa mix is a kind of _________.A. Additive B. Preservative C. Disinfectant D. Antiseptic3. Why is citric acid added to juice drink preparation? Citric acid ______________.A. makes the juice drink last longer C. dissolves the solidB. provides sour taste D. provides red color4. Why paints are usually applied on the outer surface of walls? Paints _________.A. protect the wall from the harmful effects of heat and rainB. make homes attractiveC. deodorize homesD. both a and b5. Why are pesticides used by farmers? It is used to ________________.A. destroy plant pests C. kill harmful weedsB. decrease crop yield D. both a and b

6. Why are thinner and turpentine added to paints? They __________.A. give color to paintsB. remove mold in paintsC. hold pigment particles togetherD. make paints easy to spread on surfaces7. Which of the following additives will best give color to kare-kare?A. red food color B. achuete seeds C. salitre D. sugar8. Here are some things Aling Cora does to meat. Which of these will NOT slow down the spoiling of meat?A . Drying C. Soaking the meat in waterB. Salting D. Storing the meat in the freezer9. How can ordinary glass be made heat resistant? By adding _________A. zinc to the glass C. magnesium to the glassB. boric oxide to the glass D. cyanide solutions to the glass10. How is the capsule form of drugs better than the tablet form? It is _________.A. AttractiveB. less in weightC. less in volumeD. more efficient because it dissolves in the target area

11. Antibiotics are now made inside degradable plastic capsule that dissolve slowly in the stomach and intestines. This is done by ________A. HeatingB. MeltingC. laminationD. using a special material affected by digestive juices12. How did the improvement of materials by technology help people? They _________________A. make life easier and more comfortableB. protect people from harmC. help prepare foodD. all of these13. What material causes the destruction of the ozone layer?A. Chlorofluorocarbons C. Manganese OxideB. hydrochloric acid D. Carbon dioxide14. What may occur as a result of the release of so much gaseous wastes particularly, carbon dioxide in the atmosphere?A. Global cooling C. EuthrophicationB. Global warming D. Flooding15. Why is acid rain harmful? Acid rain is harmful because it can _______A. contaminate water supply and corrode some materialsB. make the surroundings hotC. bring about droughtD. bring lots of rain

16. Why are clams and mussel banned from consumption when red tide occurs? Because they __________.A. cause paralysis or death when eaten C. can multiply very fastB. have no nutritional value D. both a and b17. In what way is a pressure cooker useful/beneficial?A. It is durable. C. It lessens cooking time.B. It can cook more food. D. It can make food taste better.18.Which statement is true?A. Energy increase in the passage of time.B. Energy can be destroyed.C. Energy is conserved.D. Energy can be lost.19. How can white clothes be made whiter? It can be made whiter by_________A. Eating B. ironing C. bleaching D. vulcanizing20. Why is fermentation beneficial to man? Fermentation _________.A. enables frying pan to achieve a non-stick finishB. produces vinegar, wine, and fish pasteC. removes stains from clothesD. makes raw rubber softer

21. Why should one wash his hands thoroughly after using insecticides?A. To transfer harmful effects on insecticides to the water.B. To remove traces of poison.C. To avoid plant contamination.D. both B and C22. What should you do to avoid taking poisonous materials by mistake?A. Reread labels of materials or products before taking them.B. Separate poisonous substances from food items.C. Label poisonous substances properly.D. All of the above.23. Which are non biodegradable?•vegetable and fruit peeling II.tin cans, broken glasses III. Styrofoam food containers IV. plastic and rubber slipperA. I only B. II only C. I, II, III D. II, III, IV24. All of the following describe proper practices in using/disposing materials at home EXCEPTA. Always smell and taste materials before using themB. Covering one's nose when spraying insecticidesC. Keep petroleum products in safe containersD. Read labels before using chemical products25. You must NOT read labels of chemicals like medicines, insecticides and pesticide before using them?A. True B. False C. Maybe D. None of these

26. Poisonous substances must be kept in tightly covered containers and away from the reach of children.A. True B. False C. Maybe D. None of these27. Too much carbon dioxide in the atmosphere prevents heat from escaping into the outer space. This makes the earth _________?•A. lighter than it used to be C. colder than it used to beB. heavier than it used to be D. warmer than it used to be28. What happens to the energy possessed by a person when he uses it in doing work?A. It is converted to light energyB. It is changed into radiant energyC. It is transformed into chemical energyD. It is transformed into mechanical energy29. What happens to heat produced during energy transformation? Heat __________.A. is changed to radiant energy C. is transferred to the environmentB. escapes into the outer space D. is absorbed by the heated object30. Your mother shopping at the supermarket finds difficulty pushing the cart loaded with groceries. Why is it difficult to push a cart loaded with groceries than when it is empty?A. An unbalanced force is needed to move a loaded cartB. Equal force is needed to move loaded cart and an empty cartC. Less force is needed to push a cart loaded with groceries because of its wheelsD. More force is needed to push loaded cart since it has more mass than when it is empty

31. Which of the following indicates velocity?A. bicycle stopping at northeast point C. Ferry boat sailing on the seaB. a car moving 80km/hr to the east D. a speeding car32. What form of energy is primarily produced by photosynthesis in green plants?A. Electrical B. mechanical C. chemical D. nuclear33. Which of the following proves that matter is made up of particles?A. chocolate added to water diffuses or scatters in the liquidB. expansion of gas in a balloon makes it largerC. spreading of odorD. all of the above34. How are particles in a block of wood arranged?A. closely packed together C. very far apartB. very, very far apart D. far apart35. How do atoms differ from molecules? Atoms are ___________A. bigger than moleculesB. smaller than moleculesC. may or may not be bigger than moleculesD. may or may not be smaller than molecules

36. Anything that occupies space and has mass.A.Substance B. Particle C. Matter D. Molecules

37. Which of the following illustration is the model of liquid? A. B. C. D.

38. What form of energy does food provide the human body?A.Mechanical B. chemical C. electrical D. nuclear

39. What form of energy is produced when the strings of a guitar are plucked?A.Mechanical B. chemical C. radiant D. sound

40. What form of energy does a running motor produce?A. Chemical B. electrical C. mechanical D. nuclear

41. Why can the sun give off tremendous amount of solar energy? It can give off tremendous amount of energy because _________.A. rays of the sun continue to glowB. nuclear energy is locked up when atoms splitC. it contains millions of nonmoving, unreacting atomsD. energy is released when the sun's atom combine/split42. How is chemical energy stored in food used by the human body? It is used for __________.A. Growth C. growth and developmentB. Fattening D. increasing body weight only43. What is one way by which physicians determine a healthy pair of lungs? By using __________.A. video machine B. microscope C. camera D. x-ray44. Why is nuclear fusion less harmful than nuclear fission? It is less harmful because nuclear fusion ___________.A. produces very little radioactivity and less dangerous waste productsB. has an abundant supply of radioactive wastesC. can supply energy to homesD. None of the above45. What energy transformation does a blender or mixer show?A. mechanical energy to electrical energyB. electrical energy to mechanical energyC. mechanical energy to chemical energyD. thermal energy to mechanical energy

46. Which of the following does not show the transfer of energy from one body to another?A. eating corn on a cobB. placing a spoon in a cup of hot coffeeC. lighting a room with a fluorescent lampD. placing a cup of frozen cream in a freezer47. What is always produced when there is energy transformation?A. light B. heat C. chemical D. electrical48. What happens to heat during energy transformation? Heat is __________.A. changed to radiant energyB. escapes into the outer spaceC. reabsorbed by the heated objectD. absorbed by the surrounding environment49. How is nuclear energy produced? It is produced through __________.A. the combination of a heavier atom with a lighter atomB. the splitting apart of nucleusC. bombardment of atomsD. both A and B50. Based on the graph of the race, who is the winner, A, B, C, or D?