PHYSICS END OF TERM 1 YEAR 8 PROGRESSIVE TEST DECEMBER 2021

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    English
  1. Physics
  2. 8 Grade
  3. By musungu nang'ombe
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PHYSICS END OF TERM 1 YEAR 8 PROGRESSIVE TEST DECEMBER 2021 INSTRUCTIONS: - Answer all the questions in the spaces provided. 1. Why do you get a more accurate measurement of the time that it takes a ball to fall using timing gates rather than a stopwatch? [2mks] 2. What is reaction time? [1mk] 3. Why is automatic timing more important for a sprint race than a marathon? [1mk] 4. Makena and Micah are timing how long it takes for 1g of sugar to dissolve in hot water. Makena records a time of 24.3 seconds. Micah records a time of 24 seconds. Whose reading is more precise? Why? [2mks]

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5. David drives 170.4 km in 2 hours. Calculate his average speed in km/h. [2mks] 6. Fatima walks a 200 km journey in 4days, walking 4 hours every day. a) What is her average speed? [3mks] b) Change the speed in (a) above in to m/s. [3mks] 7. Jess runs 100 m in 12 seconds. Nikita runs the same distance in 14 seconds. Who is faster? [1mk] 8. Explain the difference between speed and acceleration. [2mks]

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9. At the start the Formula 1 car accelerated from 0 km/h to 180 km/h in 4 seconds. 180 km/h is the same as 50 m/s. a) Calculate the acceleration. ( remember acceleration is the difference in speed over time) [2mks] b) Calculate the time it will take to move from 50m/s to 70m/s if the acceleration is kept constant as the one in (a) above? [2mks] 10.Define the following terms; [5mks] a) Sound b) Vacuum c) Wave length

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d) Amplitude e) Frequency 11.Use “very fast”, “faster”, “Slow“ or “does not” to show conductivity of sound through the following medium: [4mks] a) Liquid b) Gases c) Solid d) Vacuum 12.Your vocal cords and a loudspeaker produce sound. Name three other sources of sounds waves. [3mks] 13.Name two objects that have the ability to detect sound. [2mks] 14.State 4 causes of hearing loss in man. [4mks]

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15.State two ways in which one can use to reduce the risk of hearing loss. [2mks] 16.One reason why truck drivers should not drive for long periods is because they may get tired and fall asleep. Suggest another reason. [1mk] 17.A person jogs 4.0 km in 32 minutes, then 2.0 km in 22 minutes, and finally 1.0 km in 16 minutes. What is the jogger’s average speed in km per minute? [3mks] 18.What is noise? [1mk] 19.What is echo? [1mk] 20.Whales and other sea creatures can hear sound even when under water. Explain. [2mks]