Grade 7 Science

1. Which ONE of the following types of waves is NOT an example of a mechanical wave?

• a. Sound waves

• b. Light waves

• c. Water waves

• d. Seismic waves

Answer explanation

b. Light waves

2. Select the correct definition from the list below for a transverse wave.

• a. The oscillations of a transverse wave are perpendicular to the direction in which the waves transfer energy.

• b. The oscillations of a transverse wave are parallel to the direction in which the waves transfer energy.

• c. The oscillations of a transverse wave are at 45o to the direction in which the waves transfer energy.

• d. The oscillations of a transverse wave are in the same direction in which the waves transfer energy.

Answer explanation

a. The oscillations of a transverse wave are perpendicular to the direction in which the waves transfer energy.

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NGSS.MS-PS4-1

3. What is the relationship between amplitude and energy?

• a. The bigger the amplitude of the waves, the more energy the waves carry.

•  b. The smaller the amplitude of the waves, the more energy the waves carry.

• c. Amplitude and energy are not related, they have no effect on each other.

• d. Doubling the amplitude of the waves, reduces the amount of energy the wave carries by half.

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NGSS.MS-PS4-1

4. It is the number of waves that pass a point in a certain period of time.

• a. Speed

• b. Wavelength

• c. Frequency

• d. Amplitude

5. It is a wave that require a medium to travel through.

•  a. Longitudinal wave

•  b. Electromagnetic wave

•  c. Mechanical wave

•  d. Transverse wave

6. Which piece of apparatus would be most suitable for investigating waves?

• a. A beaker of water.

• b. A mirror.

• c. A Ripple tank.

• d. A flat piece of wood.

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NGSS.MS-PS4-1

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7. Sound waves cannot travel through…

• a. matter.

• b. solids.

• c. a vacuum.

• d. a gas.

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NGSS.MS-PS4-2

8. Compare longitudinal waves from transverse waves

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Answer explanation

A longitudinal wave vibrates in the same direction as the wave travels, while a transverse wave vibrates perpendicular to the direction of wave propagation.

9. In your own opinion, what is the most common type of wave? Why?

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Answer explanation

he most common type of wave is the electromagnetic wave, which includes visible light, radio waves, microwaves, X-rays, and gamma rays. These waves are produced by the movement of electrically charged particles and can travel through a vacuum. They are widely used in communication, entertainment, medicine, and scientific research.

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NGSS.MS-PS4-1

10. How will you relate and apply your learning about wave in real life situation?

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Answer explanation

My learning about waves can be applied in various real-life situations, such as understanding how sound waves travel through different mediums and how radio waves are used in communication technology. It can also help me understand how seismic waves cause earthquakes and how ocean waves are formed, providing insight into the dynamics of natural phenomena.

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NGSS.MS-PS4-1

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