sound quiz for grade 8 learners in science

A quiz for grade 8

1. TEST I.MULTIPLE CHIOCE 1. Which of the following factors does the speed of sound depend? A. density C. temperature B. elasticity D. all of the above 2. An echo occurs when a sound wave is _______. A. absorbed C. refracted B. reflected D. transmitted

2. 3. What happens to the speed of sound as the temperature increases? A. constant C. increases B. decreases D. cannot be determined 4. Which phenomenon explains why sound is heard at longer distances at night than in day? A. echolocation C. refraction B. reflection D. reverberation

3. 5. How fast does sound travel if the air temperature is 20 degrees Celsius? A. 334 m/s B. 340 m/s C. 343 m/s D. 345 m/s

4. 6. Which of the following is true about the effect of air temperature on the speed of sound? A. The lower the temperature the faster the speed. B. The higher the temperature the faster the speed. C. The higher the temperature the slower the speed. D. The temperature does not affect the speed of sound.

5. 7. What is the relationship of temperature to the speed of sound? A. equal B. no relationship C. directly proportional D. inversely proportional

6. 8. Sound travels faster through warm materials than cold materials because_____. A. warm particles move slowly B. gas particles are packed tightly C. warm particles are moving quickly D. sound does not travel faster through a warm substance

7. 9. Ships use echolocation to measure the ______. A. size of fish C. depth of water B. area of ocean D. density of water 10.When the direction of a wave changes as it passes from one medium to another, it is called _________. A. density C. reflection B. echo D. refraction

8. TEST II: Situational Analysis Directions: Read, analyze, and answer the given situations. 1. Why would you hear the siren sound of a fire truck clearly in a nearby barangay during nighttime than daytime? ________________________________________________________________________

9. 2. Why is it quieter in areas with high elevation such as Tagaytay and Baguio than in lowlands? _____________________________________________________________________________

10. TEST III.Problem Solving: 1. What is the speed of sound in the air if the temperature is 15 ℃? Solve Using the formula below. Given: T = 15 ℃ Solution: 𝑣 = 331 𝑚/ 𝑠 + 0.6 𝑚/𝑠 (T ) ℃

11. TEST III.Problem Solving: 2. What is the speed of sound in the air if the temperature is 18℃? Solve Using the formula below. Given: T = 18 ℃ Solution: 𝑣 = 331 𝑚/ 𝑠 + 0.6 𝑚/𝑠 (T ) ℃

12. TEST III.Problem Solving: 1. What is the speed of sound in the air if the temperature is 5℃? Solve Using the formula below. Given: T = 5 ℃ Solution: 𝑣 = 331 𝑚/ 𝑠 + 0.6 𝑚/𝑠 (T ) ℃

13. TEST III.Problem Solving: 2. What is the speed of sound in the air if the temperature is 23℃? Solve Using the formula below. Given: T =23 ℃ Solution: 𝑣 = 331 𝑚/ 𝑠 + 0.6 𝑚/𝑠 (T ) ℃

14. TEST III.Problem Solving: 1. What is the speed of sound in the air if the temperature is 14℃? Solve Using the formula below. Given: T =14 ℃ Solution: 𝑣 = 331 𝑚/ 𝑠 + 0.6 𝑚/𝑠 (T ) ℃

15. TEST III.Problem Solving: 2. What is the speed of sound in the air if the temperature is 31℃? Solve Using the formula below. Given: T =31 ℃ Solution: 𝑣 = 331 𝑚/ 𝑠 + 0.6 𝑚/𝑠 (T ) ℃