Direction: Read the questions carefully. Write the letter of the correct answer on the space provided. 1. The transfer of heat in solid materials is called A. convection B.insulator C. conduction D. radiation 2. A heat transfer across an empty space or vacuum is called A. conduction B. convection C. radiation D. conductor 3. A heat that travels through liquids and gases is called A. conductor B. radiation C. convection D. conduction 4. It serves as good conductor. A. wood B. plastic C. metal D. water 5. What is the direction of heat transfer? A. from hot to cold B. from cold to hot C. from side to side D. from bottom to top 6. What may happen to a solid when it is continuously exposed to heat? A. it may melt C. it may become heavier B. it may expand D. it may decrease in volume 7. Light always travels in when going through a single medium. A. curve line B. straight line C. diagonal line D. wavy line 8. A travels different speed through different media, A. vibration B. reflection C. sound wave D. all of these options 9. When the sound travels through solids, the vibration of the particles move A. slowly B. moderately C. irregularly D. fast 10. How do sound travels through air? A. slowly B. fast C. in jumping motion D. moderately 11. What affects the speed of sound as it travels? C. the origin of the sound A. person receiving it D. loudness of the sound B. the nature of material 12. The bouncing back by a body or surface of light, heat, or sound without absorbing it. D. Transmission C. Reflection B. Refraction A. Absorption
