Sound, Forces, Energy Resources, Magnetism, Transformers.

1. What is the highest frequency humans can hear?

• A). 10 kHz
• B). 20 kHz
• C). 100 kHz
• D). 200 kHz

2. What is the lowest frequency humans can hear?

• A). 10 Hz
• B). 20 Hz
• C). 100 Hz
• D). 200 Hz

• A). Oscilloscope
• B). Stethoscope
• C). Sound sensor
• D). Signal generator

4&5. Here are 4 sound waves shown on one of these devices.

Which of these diagrams shows...

4. A loud, high pitched sound?

5. A quiet high frequency sound?

6. A low frequency sound with a high amplitude?

7&8. In an experiment to measure the speed of sound, a student bangs together 2 wooden blocks. Another student listens out for the echo from the wall.

The wall is 100 m away.

The echo returns to the students after a delay of 0.6 seconds.

7. Which of these 4 formulas should be used to calculate the speed of sound?

• A). speed = velocity x time
• B). speed = distance x time
• C). speed = velocity ÷ time
• D). speed = distance ÷ time

8. Using the data from this experiment, what is the speed of sound?

• A). 60 m/s
• B). 167 m/s
• C). 120 m/s
• D). 333 m/s

9. Which of the points on this metal block shows the position of the centre of gravity?

10. The diagram below shows a light wooden beam supported at each end. A 1000 N weight rests on the beam closer to the right hand side of the beam.

Which of the answers below gives realistic values for the size of the forces X and Y?

• A). X = 700 N, Y = 300 N.
• B). X = 300 N, Y = 700 N.
• C). X = 500 N, Y = 500 N.
• D). X = 1000 N, Y = 1000 N.