Waves unit test science 7B

Answer 1

1. What causes waves to form in the ocean?

a) Wind blowing over the surface of the water
b) Earthquakes
c) Tidal forces
d) Underwater volcanic activity

2. What is the highest point of a wave called?

a) Trough
b) Crest
c) Wavelength
d) Frequency

3. Which type of wave does not require a medium to travel through?

a) Transverse wave
b) Longitudinal wave
c) Surface wave
d) Mechanical wave

4. What is the formula for calculating the speed of a wave?

a) Speed = frequency x wavelength
b) Speed = wavelength ÷ frequency
c) Speed = frequency + wavelength
d) Speed = wavelength x amplitude

5. What happens to the wavelength of a wave when its frequency increases?

a) The wavelength increases
b) The wavelength decreases
c) The wavelength stays the same
d) The wavelength becomes more erratic

6. How do waves transfer energy from one place to another?

a) By creating vibrations in the medium
b) By causing particles in the medium to move in a circular motion
c) By creating a disturbance that travels through the medium
d) By changing the temperature of the medium

7. What type of wave is sound?

a) Transverse wave
b) Surface wave
c) Mechanical wave
d) Electromagnetic wave

8. What is the relationship between the amplitude of a wave and its energy?

a) The higher the amplitude, the lower the energy
b) The higher the amplitude, the higher the energy
c) The lower the amplitude, the higher the energy
d) There is no relationship between amplitude and energy

9. How do waves change direction when they encounter a boundary between two mediums?

a) They speed up
b) They slow down
c) They are absorbed
d) They reflect or refract

10. What is the unit of measurement for frequency?

a) Hertz
b) Joules
c) Meters
d) Newtons

Answer Key:
1. a) Wind blowing over the surface of the water
2. b) Crest
3. d) Mechanical wave
4. a) Speed = frequency x wavelength
5. b) The wavelength decreases
6. c) By creating a disturbance that travels through the medium
7. c) Mechanical wave
8. b) The higher the amplitude, the higher the energy
9. d) They reflect or refract
10. a) Hertz