Reflection of sound — task. Physics CBSE Live product, Class 9 (2026-27).

Choose the correct answer:

1. When a sound wave strikes a hard, smooth surface such as a concrete wall, what generally happens to the sound?

It stops vibrating as soon as it reaches the surface.
It is completely absorbed by the surface.
It is reflected from the surface.
It changes into a mechanical vibration that cannot travel back.

2. Which of the following is an important application of ultrasonic waves?

Measuring ordinary room temperature using a thermometer
Measuring atmospheric pressure using a barometer
Ultrasonography for obtaining images of internal body structures
Producing visible light from a torch

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