3. Which of the following best describes a flexible material? A. It absorbs liquid. C. It allows heat to pass through. B. It breaks easily. D. It bends without breaking. 4.What property of material makes a knife a good cutting tool? A. flexible and brittle C. sharp and hard B. malleable and ductile D. porous and soluble 5. Which of the following materials is not brittle? A. chips B. egg shell C. paper D. mirror 6.Which of the following best explains why most of the cooking pans are made of metal? A, Metals are transparent. C. Metals are hard and easy to wash. B. Metals are flammable. D. Metals are good conductors of heat. 7. Kerosene easily catches fire. What property of material does gasoline exhibit? A. density B. flexibility C. porosity D. flammability 8. When is a material is not considered as harmful? A. when it brings danger to others C. when it causes sickness to others B. when it hurts others D. when it helps others in their work 9. Which of the following properties of materials are considered harmful? A. hardness B. porosity C. ductility D. poisonous​