10th Samacheer Quiz

Q1. What is a likely effect of excessive reverberation?

Speech clarity decreases Speech becomes clearer Sound disappears completely Frequency becomes zero

Q2. Which is an industrial use of ultrasound?

Detecting flaws Generating electric current Making temperature zero Changing light speed

Q3. When the source moves away from the observer, the observed frequency:

Decreases Increases Remains unchanged Doubles

Q4. Why is sufficient distance from a reflecting surface needed to hear a distinct echo?

To make the time delay of reflected sound distinct To make sound speed zero To change sound colour To convert sound into heat

Q5. Sound with frequency above 20 kHz is called:

Ultrasound Infrasound Audible sound Noise

Q6. Which type of waves does SONAR use?

Ultrasound Light waves Radio waves Only infrared

Q7. What determines the pitch of a sound?

Frequency Amplitude Speed alone Intensity alone

Q8. When a sound source moves toward an observer, the observed frequency:

Increases Decreases Remains unchanged Becomes zero

Q9. Which law governs reflection of sound?

Angle of incidence equals angle of reflection Angle of incidence is always 0° Reflection angle is 90° Wavelength is zero

Q10. Sound waves in air are:

Longitudinal waves Transverse waves Electromagnetic waves Only standing waves

Acoustics