Class 10 > Unit # 10: General Waves Properties > Textbook M.C.Qs

Interactive Quiz: SHM & Waves

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1. A girl throws a small stone into a lake. She notices that 10 waves reach the bank in 5.0 seconds. What is the frequency of the waves?

Explanation: Frequency \( f = \frac{n}{t} = \frac{10}{5.0\text{ s}} = 2.0\text{ Hz} \).

2. For Reflection, Refraction, and Diffraction of water waves, in which phenomenon does the wave speed change?

Explanation: Wave speed changes only during refraction because the wave enters a new medium (change in water depth).

3. What happens to the wavefronts of water waves as they pass from deep water into shallow water (where they slow down)?

Explanation: Since speed decreases while frequency stays constant, \( v = f\lambda \) means wavelength (\(\lambda\)) must decrease, bringing the wavefronts closer together.

4. What effect causes water waves to bend around the edges of a gap into the shadow region?

Explanation: The spreading or bending of waves around obstacles or narrow gaps is defined as diffraction.

5. When water waves pass from deep into shallow water and refract, which property remains constant?

Explanation: Frequency depends only on the source producing the wave, so it remains constant across different media.

6. Which of the following is NOT a characteristic property of a wave?

Explanation: Waves transfer energy without transferring mass. Mass is not a wave parameter.

7. An object performing simple harmonic motion reaches its maximum speed at the:

Explanation: Speed is maximum at the equilibrium (mean) position, where all potential energy converted into kinetic energy.

8. In a simple pendulum, the bob accelerates from its extreme position back toward the center due to:

Explanation: The restoring force (\(mg \sin\theta\)) is a component of the gravitational force pulling the bob back.

9. In the ball and bowl system, the mean (equilibrium) position is located at:

Explanation: At the bottom (floor) of the bowl, the net force on the ball is zero.

10. Oscillations are damped over time primarily due to the presence of:

Explanation: Friction or resistive drag forces continuously dissipate mechanical energy into heat, causing damping.