10th Samacheer Quiz

Q1. Frequency is measured in hertz.

Hertz Decibel Metre Newton

Q2. What determines the pitch of a sound?

Frequency Amplitude Speed alone Intensity alone

Q3. Why is lightning seen before thunder is heard?

Sound is faster than light Light is faster than sound Thunder is produced later Air blocks light

Q4. Sound needs a material medium for propagation.

Material medium Vacuum only Magnetic field Electric field

Q5. 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

Q6. Which statement is most directly related to Unit 5: Acoustics?

Material medium Cell wall Gravity Photosynthesis

Q7. Why can sound not travel through vacuum?

Sound needs a medium Sound changes into light Vacuum is very hot Frequency becomes zero