Chapter Exam

Chapter 5: Acoustics — Online MCQ Test

Q: Sound travels in the form of which type of waves?

Answer: B. Longitudinal waves — Sound waves require a medium to travel and are characterized by the compression and rarefaction of particles, making them longitudinal.

Q: What is the unit of frequency?

Answer: C. Hertz — Hertz (Hz) is the standard SI unit used to measure the frequency of sound waves.

Q: What is the audible frequency range for a normal human being?

Answer: A. 20 Hz to 20,000 Hz — Humans can typically hear sound frequencies ranging from 20 Hz to 20 kHz.

Q: If the temperature of air increases, the velocity of sound:

Answer: B. Increases — The velocity of sound in air is directly proportional to the square root of the absolute temperature of the gas.

Q: A thunderclap is heard 5 seconds after lightning is seen. If the speed of light is 3x10^8 m/s and speed of sound is 330 m/s, how far is the storm?

Answer: A. 1650 meters — Since light travels almost instantaneously, the distance is simply Speed of sound × Time delay = 330 × 5 = 1650 meters.

SCIENCE · CLASS 10th · Tamil Nadu State Board

Practice Chapter 5: Acoustics with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 10th SCIENCE. This chapter covers: This chapter explores sound wave propagation velocity Doppler effect and factors affecting sound speed in different media. Students study echo applications ultrasonography and reve.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 5: Acoustics — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 10th SCIENCE — Chapter 5: Acoustics, with answers and explanations. These are sample questions; the exam has its own separate question set.

Sound travels in the form of which type of waves?

A. Transverse waves
B. Longitudinal waves ✓
C. Electromagnetic waves
D. Stationary waves

Answer: B. Longitudinal waves
Sound waves require a medium to travel and are characterized by the compression and rarefaction of particles, making them longitudinal.

What is the unit of frequency?

A. Meter
B. Second
C. Hertz ✓
D. Newton

Answer: C. Hertz
Hertz (Hz) is the standard SI unit used to measure the frequency of sound waves.

What is the audible frequency range for a normal human being?

A. 20 Hz to 20,000 Hz ✓
B. 200 Hz to 20,000 Hz
C. Below 20 Hz
D. Above 20,000 Hz

Answer: A. 20 Hz to 20,000 Hz
Humans can typically hear sound frequencies ranging from 20 Hz to 20 kHz.

If the temperature of air increases, the velocity of sound:

A. Decreases
B. Increases ✓
C. Remains the same
D. Becomes zero

Answer: B. Increases
The velocity of sound in air is directly proportional to the square root of the absolute temperature of the gas.

A thunderclap is heard 5 seconds after lightning is seen. If the speed of light is 3x10^8 m/s and speed of sound is 330 m/s, how far is the storm?

A. 1650 meters ✓
B. 1500 meters
C. 1.5 km
D. 3300 meters

Answer: A. 1650 meters
Since light travels almost instantaneously, the distance is simply Speed of sound × Time delay = 330 × 5 = 1650 meters.

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