SCIENCE
Choose the letter of the correct answer.
______1. These are one of the strongest materials in the universe.
a. Polymers b. plastics c. metals
______2. These are very big molecules made of smaller molecules linked together into long and repeating chains.
a. Plastics b. polymers c. metals
______3. They can be molded easily because they have high melting point.
a. Polymers b. plastics c. metals
______4. It is made up of resin (sap) obtained from rubber trees.
a. Ceramics b. glass c. rubber
______5. These are nonmetallic materials that include clay and glass.
a. Ceramic b. glass c. rubber
______6. It is a shiny, transparent and brittle material.
a. Ceramics b. glass c. rubber
______7. These are derived from strong and rigid stems and roots of woody plants like abaca and narra.
a. Wood b. fiber c. ceramic
______8. These are tiny, strong and elongated strands.
a. Wood b. fiber c. ceramic
______9. These fibers are derived from plants and animals like cotton and wool.
a. Synthetic/artificial fibers b. naturally occurring fibers c. glass
_____10. These fibers are man-made.
a. Synthetic/artificial fiber b. naturally occurring fibers c. glass
_____11. These are material/substances found in food.
a. Nutrients b. wood c. glass
_____12. These are added to food to improve the quality of color, flavor or texture and to prevent or delay spoilage.
a. Nutrients b. food additives c. wood
_____13. It is added in order to enhance its visual appearance and to attract consumers to buy the food.
a. Taste and texture modifier b. thickener c. color additive
_____14 It is commonly known as Vetsin, a substance extracted from grains or beets used to bring out and enhance
the flavors of food to which it is added.
a. Taste and texture modifier b. sweeteners c. flavor enhancers
_____15. These give a sweet taste to any food substances.
a. Thickeners b. sweeteners c. flavor enhancer
Identify the following statements below. Choose your answer from the word pool
Chemical Change Production of Sound and Color Release or Evolution of Gas
Freezing Evaporation Melting Physical Change Condensation
Production of Heat Production of Electricity Production of Precipitate
______________________________1. It occurs when a substance change in size, shape and appearance.
______________________________2. These require the increase in the temperature of the substances.
______________________________3. These require the decrease in the temperature of the substances.
______________________________4. It is the change in the composition of its7. molecules.
______________________________5. Burning of materials containing carbon, such as wood, coal, oil or food.
______________________________6. Formation of product known as curdle.
______________________________7. The product produced by burning.
______________________________8. The only product produced by burning.
Write PC – Physical Change and CP – Chemical Change.
_______1. Frying egg _______11. Crushing of can
_______2. Baking a cake _______12. Mixing sand with water
_______3. Tires burning _______13. Iron rusting
_______4. Melting of ice _______14. Rotting banana
_______5. Ripping of paper _______15. Curdling of milk
_______6. Breaking of glass _______16. Making yoghurt from milk
_______7. Formation of ash _______17. Melting of candle
_______8. Burning of candle _______18. Fireworks
_______9. Sublimation of dry ice _______19. Evaporation of water
_______10. Dissolving sugar in water _______20. Digestion of food
